CN202849895U - Structure for repairing urban asphalt pavements - Google Patents
Structure for repairing urban asphalt pavements Download PDFInfo
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- CN202849895U CN202849895U CN 201220451354 CN201220451354U CN202849895U CN 202849895 U CN202849895 U CN 202849895U CN 201220451354 CN201220451354 CN 201220451354 CN 201220451354 U CN201220451354 U CN 201220451354U CN 202849895 U CN202849895 U CN 202849895U
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Abstract
The utility model belongs to the technical field of repairing of urban asphalt pavements and discloses a structure for repairing the urban asphalt pavements. The structure comprises an asphalt pavement surface layer, a base layer, an upper layer high-strength geogrid, a geocell reinforced layer filled with old asphalt pavement combined aggregate, a lower layer high-strength geogrid, a waterproof layer and a roadbed from top to bottom. By adopting the structure, the original old asphalt pavement material is fully used, and cross influence of rainwater and underground water on the roadbed and the asphalt pavement is effectively avoided. Meanwhile, through a combined reinforced structure of the upper layer high-strength geogrid, the lower layer high-strength geogrid and the geocell reinforced layer, the non-deformability of an asphalt pavement structure can be effectively improved, the development of cracks and deformation of the asphalt pavement structure is limited, and the service life of the asphalt pavement is prolonged. Particularly, when a partially bad foundation exists below the pavement structure, the load on the partially bad foundation can be effectively transmitted to surrounding foundations through a 'beam effect' formed by the combined reinforced structure, so that a newly paved asphalt pavement structure is prevented from being damaged again.
Description
Technical field
The utility model belongs to Urban Asphalt Pavement recovery technique field, especially relates to the Urban Road Asphalt Pavement repair structure that there is local unfavorable foundation in a kind of roadbed.
Background technology
Urban Asphalt Pavement is one of principal mode of China's urban road surfaces, has the surface finish height, and the driving process is comfortable, cause the little and low noise advantages of vibration.But flexible pavement is as a kind of overall structure layer, be subjected to subgrade strength, traffic loading and all kinds of such environmental effects very large, various diseases such as check crack, depression, differential settlement, roughness descent in use can occur, have a strong impact on traffic safety and driving quality.When pavement damage reaches to a certain degree, just need road pavement to carry out integral body or local the reparation.
Because urban road is subject to the grade elevation restriction, the flexible pavement reclamation activities is mainly take the method for overhauling as main.The method of overhauling refers to remove needs redeck, after roadbed is processed again, and the flexible pavement that making is new.Being applicable to roadbed exists local unfavorable foundation, old pavement absolute altitude to forbid the whole and part road rehabilitation that raises.But the old asphalt pavement of the method is broken, transportation, the discarded great amount of cost that needs, and the simultaneously discarded meeting of old asphalt pavement brings serious destruction to the surrounding city environment.In addition, the Urban Asphalt Pavement local damage owing to exist local unfavorable foundation to cause under the flexible pavement, if just flexible pavement is overhauled processing, and is not processed local unfavorable foundation often, can only " take stopgap measures " like this and can not " effect a permanent cure ".Under action of traffic loading, this place's roadbed is easy to again depression and causes that asphalt pavement structure is destroyed.But, front to local unfavorable foundation processing (at present main cushion, slip casting method and the cement mixing pile method of adopting) if flexible pavement is overhauled, also can bring problems.At first, the ground processing cost is too high, can account for flexible pavement and overhaul the over half of cost; Secondly, need larger mechanical execution platform when ground is processed, sometimes even need the whole highway section of sealing, have a strong impact on the smoothness of urban traffic; The noise that causes when again, ground is processed, dust etc. have had a strong impact on construction section periphery civic quality of life; At last, the excavating of a large amount of old foundation soils that cushion produces, transport, purchase discarded and newly underfill material, transport, fill and also need great amount of cost, and slip casting method and cement mixing pile method are not only wasted resource, also can cause severe contamination to existing roadbed simultaneously, very large on the impact of urban environment.
The utility model content
The purpose of this utility model is the deficiency that exists in the existing Urban Asphalt Pavement recovery technique to provide a kind of Urban Asphalt Pavement repair structure, and this repair structure is reasonable in design, environmental protection and energy saving.
The technical scheme that realizes the utility model purpose is as follows:
A kind of Urban Asphalt Pavement repair structure comprises geotechnical grid reinforcement layer, lower floor's high-strength earth work grille, waterproofing course and roadbed that bituminous pavement top, basic unit, upper strata high-strength earth work grille, old asphalt pavement combined aggregate are filled from top to bottom.
Further, described basic unit is flexbile base or semi-rigid type base.
Tensile strength when further, described upper strata high-strength earth work grille and lower floor's high-strength earth work grille all satisfy elongation rate and be 0.5% is not less than the condition of 120kN/m.
Further, described old asphalt pavement combined aggregate is to form after mixing by the sand-gravel aggregate that mixes old asphalt pavement aggregate quality 10%-30% ratio after pulverization process in the old asphalt pavement aggregate that obtains to the broken piece of old asphalt pavement, wherein, the old asphalt pavement maximum aggregate size that obtains after the pulverization process is less than 50mm.
The level that described grit gathers materials is equipped with the quality percentage meter by square hole screen, be respectively: the sand-gravel aggregate by the 10.0mm square hole screen is 100%, sand-gravel aggregate by the 5.0mm square hole screen is 75%-90%, sand-gravel aggregate by the 2.0mm square hole screen is 50%-70%, sand-gravel aggregate by the 0.5mm square hole screen is 20%-40%, and the sand-gravel aggregate by the 0.25mm square hole screen is 0%-5%.
The particle diameter of described old asphalt pavement combined aggregate also must satisfy simultaneously nonuniform coefficent Cu and be not less than 5 and curve coefficientCc two conditions in the 1-3 scope.
Further, described geotechnical grid single hole area is at 0.05-0.1m
2, the lattice chamber sheet yield strength of geotechnical grid is not less than 150kN/m.
Further, described waterproofing course is waterproofing geomembrane or waterproof geotextiles.
This pavement repair structure takes full advantage of original old bitumen pavement material, energy-conserving and environment-protective, but also saved old asphalt pavement transportation and discarded required great amount of cost, and waterproofing course can effectively be isolated precipitation and underground water to the cross influence of roadbed and flexible pavement.Simultaneously, by upper strata high-strength earth work grille, the geotechnical grid reinforcement layer of old asphalt pavement combined aggregate filling and the combination reinforced structure of lower floor's high-strength earth work grille, but Effective Raise asphalt pavement structure non-deformability, carrying out of restriction asphalt pavement crack and distortion, reduce the asphalt pavement conserving cost, improve flexible pavement application life.Particularly when there is local unfavorable foundation in roadbed, the totally-enclosed geotechnical grid reinforcement " beam effect " that this combination reinforced structure forms can be effectively with the Load Transfer on the local unfavorable foundation to around roadbed, can effectively reduce local unfavorable foundation depression and differential settlement, avoid new black top road structure again to be damaged.In sum, this structure applications is when Urban Asphalt Pavement is repaired, can effectively limit carrying out of asphalt pavement crack and distortion, prevent that local unfavorable foundation is to the again damage of green road surface structure, reduce the asphalt pavement conserving cost, improve the application life of flexible pavement, little to urban traffic and ambient influnence.
The construction method step of above-mentioned Urban Asphalt Pavement repair structure is as follows:
A, the old asphalt pavement that need are overhauled carry out break process, form the broken piece of old asphalt pavement, and dig to the above 3-5cm of roadbed design absolute altitude;
B, the broken piece of old asphalt pavement is carried out pulverization process, obtain the old asphalt pavement aggregate, then mix the sand-gravel aggregate of old asphalt pavement aggregate quality 10%-30% ratio, form the good old asphalt pavement combined aggregate 4 of grating after sand-gravel aggregate mixes with the old asphalt pavement aggregate;
C, with the abundant compacting of roadbed, Subgrade Compaction must reach more than 95%;
D, the roadbed after the compacting is carried out smooth processing, absolute altitude is the roadbed design absolute altitude, then lays one deck waterproofing course at roadbed;
E, set floor height intensity geo-grid on the waterproofing course upper berth;
F, lay one deck geotechnical grid at the lower floor high-strength earth work grille, the geotechnical grid height is in the 10-15cm scope, then the old asphalt pavement combined aggregate is filled to geotechnical grid, and fully compacting, old asphalt pavement combined aggregate degree of compaction must reach more than 95% after the compacting, the old asphalt pavement combined aggregate must fill up geotechnical grid after the compacting, obtains the geotechnical grid reinforcement layer that the old asphalt pavement combined aggregate is filled;
G, the geotechnical grid reinforcement layer that the old asphalt pavement combined aggregate is filled carry out smooth processing, then lay the upper strata high-strength earth work grille;
H, high-strength earth work grille is laid basic unit on the upper strata;
I, in basic unit the making bituminous pavement top.
Advantage and technique effect that repair structure of the present utility model and job practices thereof are concrete are as follows:
1, takes full advantage of original old bitumen pavement material, energy-conserving and environment-protective;
2, old asphalt pavement transportation and discarded required great amount of cost have been saved;
3, effectively avoided precipitation and underground water to the cross influence of roadbed and flexible pavement;
4, improved the flexible pavement non-deformability, obvious to the restriction of asphalt pavement crack and distortion;
5, effectively reduce local unfavorable foundation to the impact of asphalt pavement structure, avoided the again damage on new black top road surface;
6, avoided that local unfavorable foundation is carried out ground and processed, effectively saved flexible pavement and overhauled cost;
7, effectively reduce flexible pavement and overhauled impact on urban traffic and environment;
8, reduce the asphalt pavement conserving cost, improved flexible pavement application life.
Description of drawings
Fig. 1 is the sectional drawing of a kind of Urban Asphalt Pavement repair structure of the present utility model.
Fig. 2 is the force analysis figure of a kind of Urban Asphalt Pavement repair structure of the present utility model.
Fig. 3 is the force analysis figure that exists under a kind of Urban Asphalt Pavement repair structure of the present utility model in the local unfavorable foundation situation.
Fig. 4 is the force analysis figure of combination reinforced structure unit when having local unfavorable foundation under a kind of Urban Asphalt Pavement repair structure of the present utility model.
Description of reference numerals is as follows: 1, bituminous pavement top; 2, basic unit; 3-1, upper strata high-strength earth work grille; 3-2, lower floor's high-strength earth work grille; 4, old asphalt pavement combined aggregate; 5, geotechnical grid; 6, waterproofing course; 7, roadbed; 8, traffic loading; 9, lateral deformation; 10, lateral deformation restraint forces; 11, local unfavorable foundation; 12, extruding force; 13, lateral restriction; 14, " handbag " power.
The specific embodiment
Below in conjunction with accompanying drawing and specific embodiment structure of the present utility model and job practices thereof are described in further detail:
Embodiment 1:
Referring to Fig. 1, a kind of Urban Asphalt Pavement repair structure comprises geotechnical grid 5 reinforcement layers, the high-strength earth work grille 3-2 of lower floor, waterproofing course 6 and roadbed 7 that bituminous pavement top 1, basic unit 2, upper strata high-strength earth work grille 3-1, old asphalt pavement combined aggregate 4 are filled from top to bottom.
Described basic unit 2 is the cement stabilized macadam layer in the semi-rigid type base.
When elongation rate was 0.5%, the tensile strength of described upper strata high-strength earth work grille 3-1 and the high-strength earth work grille 3-2 of lower floor was 160kN/m.
Described old asphalt pavement combined aggregate 4 is to form after mixing by the sand-gravel aggregate that mixes old asphalt pavement aggregate quality 20% ratio after pulverization process in the old asphalt pavement aggregate that obtains to the broken piece of old asphalt pavement, wherein, the old asphalt pavement maximum aggregate size that obtains after the pulverization process is less than 50mm.
The concrete level of described sand-gravel aggregate is equipped with the quality percentage meter by square hole screen, be respectively: the sand-gravel aggregate by the 10.0mm square hole screen is 100%, sand-gravel aggregate by the 5.0mm square hole screen is 82%, sand-gravel aggregate by the 2.0mm square hole screen is 64%, sand-gravel aggregate by the 0.5mm square hole screen is 36%, and the sand-gravel aggregate by the 0.25mm square hole screen is 2%.
Described old asphalt pavement combined aggregate 4 particle diameter nonuniform coefficent Cus are 10, and curve coefficientCc is 2.
Described geotechnical grid 5 single hole areas are 0.07m
2, the lattice chamber sheet yield strength of geotechnical grid 5 is 150kN/m.
Described waterproofing course 6 is waterproofing geomembrane.
The job practices of above-mentioned Urban Asphalt Pavement repair structure the steps include:
A, the old asphalt pavement that adopts road breaker that need are overhauled carry out break process, form the broken piece of old asphalt pavement, and the single volume of broken piece is less than 0.025m
3, and dig to the above 5cm of roadbed 7 design elevations;
B, employing mill carry out pulverization process with the broken piece of old asphalt pavement, obtain the old asphalt pavement aggregate, then mix the sand-gravel aggregate of old asphalt pavement aggregate quality 20% ratio, form the good old asphalt pavement combined aggregate 4 of grating after sand-gravel aggregate mixes with the old asphalt pavement aggregate;
C, employing road roller are with roadbed 7 abundant compactings, and roadbed 7 degree of compaction are 95% after the compacting;
D, the roadbed 7 after adopting land leveller to compacting carry out smooth processing, and absolute altitude is roadbed 7 design elevations, then lays one deck waterproofing geomembranes as waterproofing course 6 at roadbed 7;
E, set floor height intensity geo-grid 3-2 on the waterproofing geomembrane upper berth;
F, lay one deck geotechnical grid 5 at the high-strength earth work grille 3-2 of lower floor, geotechnical grid 5 highly is 10cm, then old asphalt pavement combined aggregate 4 is filled to geotechnical grid 5, and the abundant compacting of employing road roller, old asphalt pavement combined aggregate 4 degree of compaction are 95% after the compacting, old asphalt pavement combined aggregate 4 must fill up geotechnical grid 5 after the compacting, obtains the geotechnical grid 5 reinforcement layers that old asphalt pavement combined aggregate 4 is filled;
G, the geotechnical grid 5 reinforcement layers that old asphalt pavement combined aggregate 4 is filled carry out smooth processing, then lay upper strata high-strength earth work grille 3-1;
H, lay the cement stabilized macadam layer as basic unit 2 at upper strata high-strength earth work grille 3-1;
I, in basic unit 2 making bituminous pavement top 1.
According to Fig. 2 as can be known: traffic loading 8 effects are carried out force analysis to pavement repair structure of the present utility model under the general condition.When traffic loading 8 acted on flexible pavement, bituminous pavement top 1 and basic unit 2 produced lateral deformation 9.The lateral deformation restraint forces 10 of the geotechnical grid 5 reinforcement layers of filling by upper strata high strength geomembrane 3-1, old asphalt pavement combined aggregate 4 and the combination reinforced structure of the high-strength earth work grille 3-2 of lower floor, but the lateral deformation 9 of operative constraint bituminous pavement top 1 and basic unit 2, Effective Raise the asphalt pavement structure non-deformability, limited carrying out of asphalt pavement structure crack and distortion.According to Fig. 3, Fig. 4 as can be known: from there being under local unfavorable foundation 11 conditions traffic loading 8 effects repair structure of the present utility model is carried out force analysis.When there was local unfavorable foundation 11 in roadbed 7, under traffic loading 8 effects, local unfavorable foundation 11 produced the diseases such as depression, produces differential settlement at roadbed 7.At this moment, " the beam effect " that the combination reinforced structure that the geotechnical grid 5 reinforcement layers of being filled by upper strata high-strength earth work grille 3-1, old asphalt pavement combined aggregate 4 and the high-strength earth work grille 3-2 of lower floor form forms, can effectively reduce local differential settlement, the stress that reduces road structure is concentrated.Single geotechnical grid Unit 5 are carried out force analysis, the depression meeting that local unfavorable foundation 11 produces causes that geotechnical grid 5 interior old asphalt pavement combined aggregates 4 produce downward extruding force 12, geotechnical grid 5 sidewalls form lateral restriction 13 to old asphalt pavement combined aggregate 4, the high-strength earth work grille 3-2 of lower floor is because the Membrane of Tensile Buildings effect produces " handbag " power 14 upwards simultaneously, " handbag " power 14 synergy of geotechnical grid 5 lateral restrictions 13 and the high-strength earth work grille 3-2 of lower floor have retrained old asphalt pavement combined aggregate 4 downward extrusion deformations.Same, when local unfavorable foundation 11 caused roadbed 7 local eminence, geotechnical grid 5 and upper strata high-strength earth work grille 3-1 synergy had retrained upwards extrusion deformation of old asphalt pavement combined aggregate 4.Can find out, totally-enclosed geotechnical grid 5 reinforcements " beam effect " that the geotechnical grid 5 reinforcement layers of being filled by upper strata high-strength earth work grille 3-1, old asphalt pavement combined aggregate 4 and the combination reinforced structure of the high-strength earth work grille 3-2 of lower floor form can be effectively with the Load Transfer on the local unfavorable foundation 11 to ground on every side, effectively reduce local unfavorable foundation 11 depressions and differential settlement, can effectively avoid new black top road structure again to damage.
Embodiment 2:
The Urban Asphalt Pavement repair structure of embodiment 1 is applied to certain Urban Asphalt Pavement reinstatement works.One section 45m Damages of Asphalt Road Surface of this road is serious, need overhaul processing.The left width of cloth of road adopted repair structure and the job practices thereof of embodiment 1 when flexible pavement was repaired, the right width of cloth of road adopts overhauls the method prior art, namely removes upper strata high-strength earth work grille, geotechnical grid, lower floor's high-strength earth work grille and waterproofing course on basis of the present utility model.After the road surface reinstatement works is finished, carry out respectively loaded plate static pressure creep test in left and right two width of cloth centerline of road, loaded plate is 1.0m
2Square plate, load is 300kPa.Behind the static pressure 100 hours, adopting left width of cloth pavement of road creep compliance of the present utility model to overhaul the method prior art reduces more than 80%, and the left width of cloth road surface static pressure time after the utility model is processed of adopting is that creep compliance reaches stationary value about 30 hours the time, and creep compliance is substantially constant subsequently; And adopting 100 hours creep compliances of right width of cloth pavement of road static pressure of overhauling after the method prior art is processed not reach yet stable state, creep compliance still continues to increase.Simultaneously, to the utility model with overhaul the method prior art and carry out equal proportion local subsidence contrast model test, model casing is of a size of 250mm * 150mm * 1000mm.Subgrade soils is taken from this flexible pavement reinstatement works subgrade soils in the model testing, and Subgrade Compaction is 95%, and the roadbed superstructure is repaired design scheme according to the flexible pavement of embodiment 1 and laid.After flexible pavement is laid complete and abundant maintenance, apply the evenly distributed load of 100kPa at flexible pavement, and empty roadbed along minor face with the drill bit of external diameter 5cm at position of center line place, long limit, model casing bottom and simulate the local subsidence that local unfavorable foundation causes, and respectively bury an earth pressure cell monitoring different section roadbed end face soil pressure underground at local subsidence section and left and right each the 50cm place of this section.Monitoring result shows: compare with the method prior art of overhauling, adopting the utility model to process rear roadbed end face soil pressure value reduces more than 65%, and arranged on left and right sides soil pressure value increases more than 30%, and it is remarkable to adopt roadbed end face behind the utility model to share " the beam effect " of load.After the flexible pavement unloading, employing is overhauled the method prior art and is carried out significantly at the local subsidence section crack, and obvious local subsidence phenomenon appears in flexible pavement, and adopts the flexible pavement after the utility model is processed that a small amount of blind crack is only arranged, and the local subsidence phenomenon does not appear in flexible pavement.
Explanation is at last, above embodiment is only unrestricted in order to the technical solution of the utility model to be described, although with reference to most preferred embodiment the utility model is had been described in detail, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement the technical solution of the utility model, and not breaking away from aim and the scope of technical solutions of the utility model, it all should be encompassed in the middle of the claim scope of the present utility model.
Claims (5)
1. a Urban Asphalt Pavement repair structure is characterized in that: comprise geotechnical grid reinforcement layer, lower floor's high-strength earth work grille, waterproofing course and roadbed that bituminous pavement top, basic unit, upper strata high-strength earth work grille, old asphalt pavement combined aggregate are filled from top to bottom.
2. Urban Asphalt Pavement repair structure according to claim 1, it is characterized in that: described basic unit is flexbile base or semi-rigid type base.
3. Urban Asphalt Pavement repair structure according to claim 1 is characterized in that: the tensile strength when described upper strata high-strength earth work grille and lower floor's high-strength earth work grille all satisfy elongation rate and be 0.5% is not less than the condition of 120 kN/m.
4. Urban Asphalt Pavement repair structure according to claim 1, it is characterized in that: described geotechnical grid single hole area is at 0.05-0.1m
2, the lattice chamber sheet yield strength of geotechnical grid is not less than 150 kN/m.
5. Urban Asphalt Pavement repair structure according to claim 1, it is characterized in that: described waterproofing course is waterproofing geomembrane or waterproof geotextiles.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220451354 CN202849895U (en) | 2012-09-05 | 2012-09-05 | Structure for repairing urban asphalt pavements |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201220451354 CN202849895U (en) | 2012-09-05 | 2012-09-05 | Structure for repairing urban asphalt pavements |
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| CN202849895U true CN202849895U (en) | 2013-04-03 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102817299A (en) * | 2012-09-05 | 2012-12-12 | 华中科技大学 | Structure for repairing urban bituminous pavements and construction method thereof |
| CN104328730A (en) * | 2014-09-26 | 2015-02-04 | 杭州江润科技有限公司 | Construction method for transforming cement concrete pavement with embedded reinforced asphalt layer |
| CN104499398A (en) * | 2014-12-12 | 2015-04-08 | 东南大学 | Asphalt pavement structure applicable to expansion deformation of black cotton soil subgrade |
| CN109024152A (en) * | 2018-09-28 | 2018-12-18 | 陈萍 | A kind of anti-skidding anti-splitting paster of prefabricated bituminous surface water shutoff and its construction technology |
| CN112609523A (en) * | 2013-09-30 | 2021-04-06 | 吉欧泰克科技有限公司 | Pavement system laid on weak roadbed and laying method thereof |
-
2012
- 2012-09-05 CN CN 201220451354 patent/CN202849895U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102817299A (en) * | 2012-09-05 | 2012-12-12 | 华中科技大学 | Structure for repairing urban bituminous pavements and construction method thereof |
| CN102817299B (en) * | 2012-09-05 | 2015-04-01 | 华中科技大学 | Structure for repairing urban bituminous pavements and construction method thereof |
| CN112609523A (en) * | 2013-09-30 | 2021-04-06 | 吉欧泰克科技有限公司 | Pavement system laid on weak roadbed and laying method thereof |
| CN104328730A (en) * | 2014-09-26 | 2015-02-04 | 杭州江润科技有限公司 | Construction method for transforming cement concrete pavement with embedded reinforced asphalt layer |
| CN104328730B (en) * | 2014-09-26 | 2016-06-08 | 杭州江润科技有限公司 | The construction method of embedded reinforcement bitumen layer transformation cement concrete pavement |
| CN104499398A (en) * | 2014-12-12 | 2015-04-08 | 东南大学 | Asphalt pavement structure applicable to expansion deformation of black cotton soil subgrade |
| CN109024152A (en) * | 2018-09-28 | 2018-12-18 | 陈萍 | A kind of anti-skidding anti-splitting paster of prefabricated bituminous surface water shutoff and its construction technology |
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