CN219709972U - Novel anti-cracking composite pavement structure - Google Patents
Novel anti-cracking composite pavement structure Download PDFInfo
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- CN219709972U CN219709972U CN202321115219.7U CN202321115219U CN219709972U CN 219709972 U CN219709972 U CN 219709972U CN 202321115219 U CN202321115219 U CN 202321115219U CN 219709972 U CN219709972 U CN 219709972U
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- 239000002131 composite material Substances 0.000 title claims abstract description 17
- 238000005336 cracking Methods 0.000 title description 9
- 239000010426 asphalt Substances 0.000 claims abstract description 20
- 239000004568 cement Substances 0.000 claims description 17
- 239000004567 concrete Substances 0.000 claims description 9
- 238000005452 bending Methods 0.000 claims description 7
- 239000000853 adhesive Substances 0.000 claims description 6
- 230000001070 adhesive effect Effects 0.000 claims description 6
- 239000011384 asphalt concrete Substances 0.000 claims description 6
- 238000009434 installation Methods 0.000 claims description 6
- 210000001503 joint Anatomy 0.000 claims description 5
- 239000003365 glass fiber Substances 0.000 claims description 3
- 239000003208 petroleum Substances 0.000 claims description 3
- 239000008187 granular material Substances 0.000 claims description 2
- 239000010410 layer Substances 0.000 abstract description 44
- 239000002344 surface layer Substances 0.000 abstract description 9
- 230000008859 change Effects 0.000 abstract description 5
- 239000011800 void material Substances 0.000 abstract description 5
- 230000005540 biological transmission Effects 0.000 abstract description 3
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 229910052500 inorganic mineral Inorganic materials 0.000 abstract description 3
- 239000011707 mineral Substances 0.000 abstract description 3
- 239000000203 mixture Substances 0.000 abstract description 3
- 239000002245 particle Substances 0.000 abstract description 3
- 239000012790 adhesive layer Substances 0.000 abstract description 2
- 238000010276 construction Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000003111 delayed effect Effects 0.000 description 2
- 230000008595 infiltration Effects 0.000 description 2
- 238000001764 infiltration Methods 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 229910021487 silica fume Inorganic materials 0.000 description 2
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000013316 zoning Methods 0.000 description 1
Landscapes
- Road Paving Structures (AREA)
Abstract
The utility model discloses a novel anti-crack composite pavement structure, wherein a roadbed framework is paved in a roadbed in a split way, unit pavement modules are paved on two sides of the roadbed framework, expansion joints are arranged on adjacent unit pavement modules, each unit pavement module comprises a base layer and a surface layer, the surface layers are sequentially paved with a lower surface layer, an adhesive layer and an upper surface layer from bottom to top, pull rods are fixedly installed on two sides of the roadbed framework, the pull rods are pre-buried in the base layer of the unit pavement module, road shoulder stop blocks are paved on road shoulders, and the tail ends of the pull rods are connected with the road shoulder stop blocks. The void structure with large particle size, large mineral aggregate, small asphalt content and large void ratio of the asphalt macadam mixture can effectively block the extension path of the crack tip, weaken the transmission capability of tensile stress and tensile strain, and can dissipate and absorb load stress and temperature stress generated by traffic load and environmental temperature change and reduce stress concentration phenomenon, thereby delaying the upward extension speed of the reflection crack.
Description
Technical Field
The utility model relates to the technical field of pavement construction, in particular to a novel anti-crack composite pavement structure.
Background
In the established expressway of China, the asphalt pavement accounts for more than 90%, and almost all of the expressways adopt a semi-rigid base layer, the semi-rigid base layer has good overall stability and durability and higher strength and bearing capacity, but the current use practice shows that the semi-rigid base layer reflection crack is always one of the problems to be solved in road construction, the semi-rigid base layer dry temperature shrinkage crack and the dry temperature shrinkage tensile stress are root causes of the reflection crack of the semi-rigid base layer asphalt pavement, and if the degree of the reflection crack of the semi-rigid base layer is required to be prevented and reduced, a method of adopting a composite base layer with a certain thickness by combining asphalt stabilized macadam and a semi-rigid material is one of very effective ways.
In the prior art, as in patent application number 201720103704.0, an anti-cracking pavement structure and a system thereof are disclosed, wherein the anti-cracking pavement structure comprises a surface layer and a base layer which are sequentially arranged from top to bottom, and the base layer is a skeleton compact structure; the base layer comprises a cement stabilized macadam base layer and a lime-silica fume base layer which are sequentially arranged from top to bottom, and a vertical interval arrangement supporting structure is arranged between the cement stabilized macadam base layer and the lime-silica fume base layer. Such a pavement structure system employs the pavement structure described above. The anti-cracking pavement structure and the system thereof have the advantages that the base layer adopts a skeleton compact structure, has smaller shrinkage coefficient, has good anti-cracking performance under the actions of temperature shrinkage and dry shrinkage, avoids reflective cracking generated by the surface layer, and improves the fatigue resistance of the pavement, so that the service life of the pavement is greatly prolonged.
The practical application process still has the defects, the generation of the reflection cracks of the asphalt pavement is mainly caused by temperature stress, the green pavement generates the root cause of the reflection cracks, when asphalt stabilized macadam is arranged on the upper base layer, the dry temperature shrinkage cracks and the dry temperature shrinkage tensile stress exist on the semi-rigid lower base layer, the extremely small cracks are caused to cause a series of chain reactions, and the cracks seriously affect the service life of the pavement.
Disclosure of Invention
The utility model aims to provide a novel anti-cracking composite pavement structure so as to solve the problems in the prior art.
In order to achieve the above purpose, the present utility model provides the following technical solutions: the utility model provides a novel anti-crack composite pavement structure, has laid the roadbed skeleton in the road bed in the zoning, and the unit road surface module has been laid to the both sides of roadbed skeleton, and adjacent unit road surface module is provided with the expansion joint, and unit road surface module includes basic unit and surface course, basic unit lays the underlayment from bottom to top in proper order, goes up the basic unit, the underlayment adopts cement stabilized macadam, it adopts cement concrete to go up the basic unit, surface course is laid down surface course, adhesive linkage and top layer from bottom to top in proper order, the top layer adopts well grain formula asphalt concrete, and the adhesive linkage adopts full glass fiber grid that spreads, and the top layer adopts fine grain formula SBS modified asphalt concrete.
Preferably, the two sides of the roadbed skeleton are fixedly provided with pull rods, the pull rods are embedded in the base layer of the unit pavement module, road shoulder stop blocks are paved at road shoulders, and the tail ends of the pull rods are connected with the road shoulder stop blocks.
Preferably, the roadbed framework and the road shoulder stop block are all prefabricated by cement concrete, an installation groove is reserved on the side face of the road shoulder stop block, a rubber base plate and a connecting bolt are arranged in the installation groove, the tail end of the pull rod extends into the installation groove and is inserted into the rubber base plate, and the connecting bolt is installed at the end part of the pull rod in a threaded mode.
Preferably, the thickness of the cement stabilized macadam of the subbase layer is 15cm, the thickness of the cement concrete of the upper base layer is 24cm, and the thickness ratio of the lower layer to the upper layer is 1.4-1.8:1.
Preferably, the expansion joint of the adjacent unit pavement module is internally provided with a drainage strip, the inside of the drainage strip is a trapezoid cavity, the inner wall of the drainage strip is provided with a support strip which is drawn out in a sliding way, two side walls of the upper opening of the drainage strip are symmetrically and fixedly provided with bending plates, and the butt joint part of the two bending plates is provided with a plurality of drainage holes.
Preferably, the inner walls of the expansion joints of the drainage bars and the adjacent unit pavement modules are filled with joint filling asphalt, and the joint filling asphalt adopts 0.5L/square meter 70 grade A petroleum hot asphalt.
Preferably, a drain pipe is embedded in the upper base layer, and the trapezoid cavity of the drain bar is communicated with the drain pipe through a connecting pipeline.
Advantageous effects
The utility model provides a novel anti-crack composite pavement structure, which has the following beneficial effects:
1. the novel crack-resistant composite pavement structure has the advantages that the void structure with large particle size of asphalt and macadam mixture adopted by the unit pavement module is large in mineral aggregate, small in asphalt content and large in void ratio, the expansion path of crack tips can be effectively blocked, the transmission capacity of tensile stress and tensile strain is weakened, the load stress and temperature stress generated by traffic load and environmental temperature change can be dissipated and absorbed, the stress concentration phenomenon is reduced, the upward expansion speed of reflective cracks is delayed, and the larger plastic deformation capacity of an asphalt stabilized macadam base layer can enable the strain energy released by the base layer cracks to be fully absorbed, so that the upward expansion of semi-rigid base layer cracks is hindered.
2. This novel compound road surface structure of anticracking through setting up fixed area's unit road surface module, just the expansion joint structure of reserving when the road surface is laid, need not the damage that the back cutting expansion joint caused the basis, avoids the rainwater infiltration basic unit, and through setting up the drainage strip in addition, can avoid expansion joint to paste stifled, and hinder the dry temperature crack and the dry temperature shrinkage tensile stress change of basic unit to avoid tiny crack's chain reaction, reach anticracking effect.
Drawings
FIG. 1 is a schematic view of the structure of the present utility model (base layer) in a top-down section;
FIG. 2 is a schematic view of a partial front cross-section of the present utility model;
fig. 3 is an enlarged schematic view of the structure of fig. 2 a according to the present utility model.
In the figure: the road bed comprises a road bed framework 1, a unit road surface module 2, a base layer 3, a surface layer 4, a base layer 5, an upper base layer 6, a lower surface layer 7, an adhesive layer 8, an upper surface layer 9, a pull rod 10, a road shoulder stop block 11, a rubber backing plate 12, a connecting bolt 13, a drainage strip 14, a support strip 15, a 16-folded plate, a 17-drainage hole and a 18-drainage pipe.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Referring to fig. 1-3, the present utility model provides a technical solution: the novel anti-crack composite pavement structure is characterized in that a roadbed framework 1 is paved in a roadbed in a split manner, unit pavement modules 2 are paved on two sides of the roadbed framework 1, pull rods 10 are fixedly installed on two sides of the roadbed framework 1, the pull rods 10 are embedded in base layers 3 of the unit pavement modules 2, road shoulder stop blocks 11 are paved at road shoulders, the tail ends of the pull rods 10 are connected with the road shoulder stop blocks 11, the roadbed framework 1 and the road shoulder stop blocks 11 are formed by prefabricating cement concrete, mounting grooves are reserved on the side surfaces of the road shoulder stop blocks 11, rubber base plates 12 and connecting bolts 13 are arranged in the mounting grooves, the tail ends of the pull rods 10 extend into the mounting grooves and are inserted into the rubber base plates 12, the connecting bolts 13 are installed at the end parts of the pull rods 10 in a threaded manner, and the transverse expansion and contraction amount of the unit pavement modules 2 are absorbed through the deformation of the rubber base plates 12.
The adjacent unit pavement module 2 is provided with the expansion joint, the unit pavement module 2 includes basic unit 3 and surface course 4, basic unit 3 lays underlayment 5, go up basic unit 6 in proper order from bottom to top, underlayment 5 adopts cement stabilized macadam, go up basic unit 6 and adopt cement concrete, surface course 4 lays down surface course 7 from bottom to top in proper order, adhesive linkage 8 and upper strata 9, upper strata 9 adopts well granule formula asphalt concrete, adhesive linkage 8 adopts full-spread glass fiber grid, upper strata 9 adopts fine-grained SBS modified asphalt concrete, cement stabilized macadam thickness of underlayment 5 is 15cm, cement concrete thickness of upper basic unit 6 is 24cm, lower layer 7 and upper strata 9 thickness ratio is 1.4-1.8:1.
The expansion joint of the adjacent unit pavement module 2 is internally provided with a drainage strip 14, two sides of the drainage strip 14 are fixedly provided with reinforcing steel bar ends, after the upper base layer 6 is paved, a groove is formed, the drainage strip 14 is buried, then the pavement layer 4 is paved, the construction process of the pavement layer 4 is carried out, the inner wall of the expansion joint of the drainage strip 14 and the adjacent unit pavement module 2 is filled with joint filling asphalt, and the joint filling asphalt adopts 0.5L/# 70A-grade petroleum hot asphalt.
The inside of the drainage strip 14 is a trapezoid cavity, a supporting strip 15 which is drawn out in a sliding manner is arranged on the inner wall of the drainage strip 14, two side walls of the upper opening of the drainage strip 14 are symmetrically and fixedly provided with bending plates 16, a plurality of water filtering holes 17 are formed in the butt joint of the two bending plates 16, a water draining pipe 18 is embedded in the inside of the upper base layer 6, the trapezoid cavity of the drainage strip 14 is communicated with the water draining pipe 18 through a connecting pipeline, after construction is completed, the supporting strip 15 is drawn out, road surface rainwater permeates into the drainage strip 14 from the water draining pipe 18, rainwater is prevented from permeating into a roadbed, the roadbed structure is prevented from being damaged by freezing and expansion of the rainwater, internal stress concentration and cracking are caused, the bending plates 16 on the drainage strip 14 can well block sand and stone foreign matters from entering, and a sufficient gap is ensured at an expansion joint so that each unit road surface module 2 is expanded and contracted by heating.
Through setting up fixed area's unit road surface module 2, just the expansion joint structure of reserving when the road surface lays, need not the damage that the cutting expansion joint caused the basis afterwards, avoid rainwater infiltration basic unit 3 and bed course, moreover through setting up drainage strip 14, can avoid the expansion joint to paste stifled, and hinder the dry temperature crack and the dry temperature shrinkage tensile stress change of basic unit to avoid tiny cracked chain reaction, reach anti-crack effect.
The pavement structure is arranged as a gap structure with large gap temperature stress accumulation and superposition of each independent unit pavement module 2 to damage the pavement, and the adopted asphalt-macadam mixture has large particle size, more mineral aggregate, less asphalt content and large void ratio, can effectively block the expansion path of the crack tip, weaken the transmission capability of tensile stress and tensile strain, and can dissipate and absorb load stress and temperature stress generated by traffic load and environmental temperature change, so that the phenomenon of stress concentration is reduced, the upward expansion speed of reflective cracks is delayed, and the larger plastic deformation capability of a stabilized macadam base layer can fully absorb strain energy released by the base layer cracks, thereby preventing the upward expansion of semi-rigid base layer cracks.
Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. Novel anti-crack composite pavement structure, its characterized in that: road bed skeleton (1) has been laid in the road bed in the area, and unit road surface module (2) have been laid to the both sides of road bed skeleton (1), and adjacent unit road surface module (2) are provided with the expansion joint, and unit road surface module (2) include basic unit (3) and surface course (4), basic unit (3) are laid basic unit (5) from bottom to top in proper order, go up basic unit (6), basic unit (5) adopt cement stabilized macadam, go up basic unit (6) and adopt cement concrete, surface course (4) are laid down surface course (7), adhesive linkage (8) and upper strata (9) from bottom to top in proper order, upper strata (9) adopt well granule formula asphalt concrete, and adhesive linkage (8) adopt full-spread glass fiber grid, and upper strata (9) adopt the SBS modified asphalt concrete of fine grain.
2. The novel crack resistant composite pavement structure of claim 1, wherein: both sides of the roadbed skeleton (1) are fixedly provided with pull rods (10), the pull rods (10) are embedded in the base layer (3) of the unit pavement module (2), road shoulder check blocks (11) are paved at road shoulders, and the tail ends of the pull rods (10) are connected with the road shoulder check blocks (11).
3. The novel crack resistant composite pavement structure of claim 2, wherein: the road bed framework (1) and the road shoulder stop block (11) are formed by prefabricating cement concrete, an installation groove is reserved on the side face of the road shoulder stop block (11), a rubber base plate (12) and a connecting bolt (13) are arranged in the installation groove, the tail end of the pull rod (10) extends into the installation groove and is inserted into the rubber base plate (12), and the connecting bolt (13) is installed at the end part of the pull rod (10) in a threaded mode.
4. A novel crack resistant composite pavement structure according to any one of claims 1-3, characterized in that: the thickness of the cement stabilized macadam of the subbase layer (5) is 15cm, the thickness of the cement concrete of the upper base layer (6) is 24cm, and the thickness ratio of the lower layer (7) to the upper layer (9) is 1.4-1.8:1.
5. The novel crack resistant composite pavement structure of claim 4, wherein: the expansion joint of the adjacent unit pavement module (2) is internally provided with a drainage strip (14), the inside of the drainage strip (14) is a trapezoid cavity, the inner wall of the drainage strip (14) is provided with a support strip (15) which is drawn out in a sliding way, two side walls of the upper opening of the drainage strip (14) are symmetrically and fixedly provided with bending plates (16), and a plurality of drainage holes (17) are formed in the butt joint position of the two bending plates (16).
6. The novel crack resistant composite pavement structure of claim 5, wherein: and the inner walls of expansion joints between the drainage strips (14) and the adjacent unit pavement modules (2) are filled with joint filling asphalt, and the joint filling asphalt adopts 0.5L/square meter 70 grade A petroleum hot asphalt.
7. The novel crack resistant composite pavement structure of claim 6, wherein: the inside of going up basic unit (6) pre-buried has drain pipe (18), the trapezoidal cavity of drainage strip (14) is through connecting tube and drain pipe (18) intercommunication.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321115219.7U CN219709972U (en) | 2023-05-10 | 2023-05-10 | Novel anti-cracking composite pavement structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321115219.7U CN219709972U (en) | 2023-05-10 | 2023-05-10 | Novel anti-cracking composite pavement structure |
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| Publication Number | Publication Date |
|---|---|
| CN219709972U true CN219709972U (en) | 2023-09-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321115219.7U Active CN219709972U (en) | 2023-05-10 | 2023-05-10 | Novel anti-cracking composite pavement structure |
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| Country | Link |
|---|---|
| CN (1) | CN219709972U (en) |
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2023
- 2023-05-10 CN CN202321115219.7U patent/CN219709972U/en active Active
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