CN1356431A - Road bed without reflected cracks on asphalt pavement and its building method - Google Patents
Road bed without reflected cracks on asphalt pavement and its building method Download PDFInfo
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- CN1356431A CN1356431A CN 01143020 CN01143020A CN1356431A CN 1356431 A CN1356431 A CN 1356431A CN 01143020 CN01143020 CN 01143020 CN 01143020 A CN01143020 A CN 01143020A CN 1356431 A CN1356431 A CN 1356431A
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- subbase
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Abstract
A road bed without reflection cracks on its asphalt pavement features that the concave-convex surface of foundation and base layer are built up or the broken stone or concrete blocks are embedded between the foundation and base layer and between the base layer and its upper layer.
Description
Technical field
The invention belongs to highway engineering, specifically belong to the foundation structure and the construction method thereof of flexible pavement.
Background technology
The highway pavement semi-rigid type base is because its intrinsic temperature contracts and the drying shrinkage characteristic, when season, transformation temperature reduction or material moisture reduced, produce volume contraction, when amount of contraction surpasses the ultimate tensile strength of semi-rigid sub-base material, certainly lead to shrinkage crack, and cause reflection crack to asphalt surface course thereupon, immersion along with rainwater or snow-broth, under the effect repeatedly of a large amount of driving load, generation is washed away and purt slurry phenomenon, make the very fast generation structural destruction in road surface, thereby greatly reduce the usability and the durability of flexible pavement, not only seriously influenced driving, and shortened construction period of highway, increase the maintenance cost of highway, the construction investment of highway is strengthened, also influenced the attractive in appearance of highway simultaneously.
At present, for the shrinkage crack problem of semi-rigid asphalt pavement, also do not find a good solution both at home and abroad, the researcher generally believes that semi-rigid type base will inevitably produce shrinkage crack, and can't overcome.China Ministry of Communications " highway engineering quality check evaluation criterion " (JTJ071-98) when blacktop is evaluated, does not deduct points as engineering defect for the reflection crack of flexible pavement semi-rigid type base yet.Therefore, mainly be to take the measure of following several respects to be delayed or alleviate the generation in crack for the reflection crack problem of flexible pavement semi-rigid type base:
Adjust the grating of gathering materials in the semi-rigid sub-base material,, adopt the way that strengthens content of coarse aggregate, to alleviate the contraction of semi-rigid type base as lime-fly ash aggregate base.
Increase the thickness of flexible pavement, with the crack reflection that delays or alleviate semi-rigid type base to asphalt surface course.
Isostructural intermediate layer of graded broken stone or stress absorption film intermediate layer are set.
Above measure is from delaying or alleviated the generation in semi-rigid asphalt pavement crack in varying degrees, but can not fundamentally address this problem, also increase the cost of engineering simultaneously and caused the generation of some unfavorable factors, method such as the increasing pitch thickness of taking to the asphalt surface course for the crack reflection that delays or alleviate semi-rigid type base, not only increased the cost of engineering greatly, and, be accompanied by that possibility that the asphalt surface course reflection crack produces increases and in advance along with the thickening of asphalt surface course.
Technology contents
Primary and foremost purpose of the present invention provides a kind of roadbed that almost need not increase the flexible pavement of cost, to overcome the reflection crack of flexible pavement.
Above-mentioned primary and foremost purpose is achieved through the following technical solutions: a kind of roadbed that overcomes asphalt pavement reflective cracking is characterized in that: employing frictional resistance coarse structure cooperates transition between basis and subbase or basic unit and subbase at least.
A further object of the present invention is to adopt easy job practices can construct the roadbed that can eliminate the semi-rigid asphalt pavement reflection crack.
One of method of constructing roadway of above-mentioned roadbed may further comprise the steps:
The equipment, apparatus or the instrument that are provided with concavo-convex member with the surface carry out concavo-convex processing to the surface on subbase and/or basis, make the surface on subbase and/or basis constitute concavo-convex;
Making basic unit and/or subbase on the surface on the subbase of above-mentioned processing and/or basis.
Two of the method for constructing roadway of above-mentioned roadbed may further comprise the steps:
The shop is covered as rubble, other hard material blocks such as concrete prefabricated after the surface compaction on subbase and/or basis, suitably presses stone roller, and keeps the surface to be the local uniform projection;
Making basic unit or subbase on above-mentioned aspect;
The hard material blocks is in the aspect of mutual boundary simultaneously.
The present invention is on the basis that increases construction costs hardly, adopt some simple and easy methods and measure, eliminate the reflection crack of semi-rigid asphalt pavement, make the reflection crack problem of semi-rigid asphalt pavement be able to science, reasonable, economic solution, prolonged the application life of road, and the thickness of energy attenuate asphalt roofing, engineering construction investment saved, reduce the maintenance cost of road, the comfortable safety of raising road travel and attractive in appearance.
Summary of drawings
Fig. 1, the 2nd, of the present invention the 1st, 2 two kind of structural representation.
Fig. 3 is the A-A sectional view among Fig. 1;
Fig. 4 is the A-A sectional view among Fig. 2.
Preferred forms
Embodiment 1
As shown in Figure 1, 2, overcome the roadbed of semi-rigid asphalt pavement reflection crack, employing frictional resistance coarse structure cooperates transition between basis 10 and subbase 20 or basic unit 30 and subbase 20 at least.
The structure that increases frictional resistance and adhesion has two kinds, and the first is arranged to concavo-convex surface at least on the surface on subbase 20 or basis 10, shown in Fig. 1,3; It two is to embed as hard material blocks such as rubble, concrete precast blocks on the surface on subbase or basis at least, makes among its two aspects that embed phase boundary simultaneously, shown in Fig. 2,4.
Frictional resistance coarse structure described in the present invention, be meant by construction equipment and on basis and/or subbase, suppress or milling goes out rough surface, bonding surface between basis 10 and subbase 20 or basic unit 30 and the subbase 20 has in fact just constituted the fit structure of constraint each other like this, perhaps add hard block body 50 by the bonding surface place between basis 10 and subbase 20 or basic unit 30 and subbase 20, make its embed simultaneously the basis that mutually combines 10 and subbase 20 or basic unit 30 with the interface place of subbase 20 two-layer among, simultaneously also can realize retraining each other the fit structure of interlayer, final realization increases frictional resistance and the adhesion between deck, overcomes the reflection crack of semi-rigid asphalt pavement.Roadbed described in the present invention is meant all decks that asphalt surface course is following.
Embodiment 2
Construct the method for the roadbed that overcomes the semi-rigid asphalt pavement reflection crack, it may further comprise the steps:
The equipment, apparatus or the instrument that are provided with concavo-convex member with the surface carry out compaction treatment to the surface on subbase 20 and/or basis 10, make the surperficial concave-convex surface on its subbase 20 and/or basis 10; Can use compacting machinary that jut is arranged on projection vibratory roller or other wheel face and other machinery or instrument that the surface of basis 10 or subbase 20 is rolled or milling in this process, make basis 10 or subbase 20 form rough surface, the mode preferably on concavo-convex surface can be arranged by grid shown in Figure 3 or staggered channel form.
Making basic unit 30 and or subbase 20 on the surface on the subbase 20 of above-mentioned processing and/or basis 10.
Preferably basal layer and subbase are carried out the processing of said process simultaneously, to reach the pinch confinement condition of best interlayer.
Embodiment 3
Construct the method for the roadbed that overcomes the semi-rigid asphalt pavement reflection crack, it may further comprise the steps:
After the surface compaction on subbase 20 and/or basis 10, spread and cover, suitably press stone roller, and keep the surface to be the local uniform projection as other hard material blocks 50 such as rubble, concrete precast blocks;
Cover basic unit 30 or subbase 20 on above-mentioned aspect upper berth;
Hard material blocks 50 is in the aspect of mutual boundary simultaneously.
The present invention does not also require that roadbed constructs in strict accordance with above-mentioned road structure, be the present invention be not strict with from bottom to top roadbed is divided into absolutely the basis 10, subbase 20,30 3 aspects of basic unit, and then asphalt surface layer 40 thereon, because, sometimes roadbed can be simpler and easy relatively, if with basis 10, subbase 20, when basic unit 30 is reduced to single mixing aspect, belong to category of the present invention equally, promptly for the basis of described mixing aspect, tackle it and implement to lay the hard block material or press stone roller or milling to become rough, mix the shrinkage strain of aspect with effective prevention in conjunction with aspect.
The present invention comprises following category equally, adopts the comparatively coarse structure in rubble etc. self surface as subbase 20, makes the frictional resistance and the adhesion increase of 30 in subbase 20 and basic unit, thereby reaches the purpose that overcomes the semi-rigid asphalt pavement reflection crack.
Before technical solution of the present invention proposes, semi-rigid sub-base material the characteristic of intrinsic contraction be considered to unsurmountable, yet the roadbed of constructing by the method for constructing roadway that the present invention adopts and the highway of asphalt surface layer thereon, because effective constraint has been implemented in contraction to the roadbed different aspects, stop its contraction, make semi-rigid material not produce shrinkage strain, allow its contraction only be present in the material with the form of shrinkage stress, like this, semi-rigid type base does not have shrinkage strain, just can not produce shrinkage crack, can not occur reflection crack simultaneously yet asphalt surface course.
The present invention can be with the method in the foregoing description 2,3 separately or be used in specific implementation process.
From economic, easy-operating angle, adopt and strengthen between basic unit and subbase and the frictional resistance between subbase and basal layer and the mode of adhesion, the purpose that uses restraint with the contraction that reaches basic unit.
Claims (5)
1. roadbed that overcomes asphalt pavement reflective cracking is characterized in that: employing frictional resistance coarse structure cooperates transition between basis and subbase or basic unit and subbase at least.
2. the roadbed that overcomes asphalt pavement reflective cracking according to claim 1 is characterized in that: be arranged to concavo-convex surface at least on the surface on subbase or basis.
3. the roadbed that overcomes asphalt pavement reflective cracking according to claim 1 is characterized in that: embed on the surface on subbase or basis at least as rubble, hard material blocks such as concrete prefabricated, make among its two aspects that embed phase boundary simultaneously.
4. the method for constructing roadway of the described roadbed of claim 1, it may further comprise the steps:
The equipment, apparatus or the instrument that are provided with concavo-convex member with the surface carry out compacting or milling processing to the surface on subbase and/or basis, make the surface on its subbase and/or basis constitute concavo-convex;
Making basic unit and/or subbase on the surface of the subbase of above-mentioned processing and/or basal layer.
5. the method for constructing roadway of the described roadbed of claim 1, it may further comprise the steps:
The shop is covered as rubble, other hard material blocks such as concrete prefabricated after the surface compaction on subbase and/or basis, suitably rolls, and keeps the surface to be the local uniform projection;
Cover basic unit or subbase on above-mentioned aspect upper berth;
The hard material blocks is in the surface layer of mutual boundary simultaneously.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011430206A CN1170036C (en) | 2001-11-29 | 2001-11-29 | Road bed without reflected cracks on asphalt pavement and its building method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011430206A CN1170036C (en) | 2001-11-29 | 2001-11-29 | Road bed without reflected cracks on asphalt pavement and its building method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1356431A true CN1356431A (en) | 2002-07-03 |
| CN1170036C CN1170036C (en) | 2004-10-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB011430206A Expired - Fee Related CN1170036C (en) | 2001-11-29 | 2001-11-29 | Road bed without reflected cracks on asphalt pavement and its building method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1170036C (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102352589A (en) * | 2011-07-21 | 2012-02-15 | 济南城建集团有限公司 | Construction method for road base concrete side mold |
| CN106835881A (en) * | 2017-02-24 | 2017-06-13 | 陈益民 | Prefabricated concrete structure layer wedge bearing spline plate flexible pavement |
| CN111119012A (en) * | 2019-12-22 | 2020-05-08 | 郑建遇 | Composite road building construction method |
| CN111663387A (en) * | 2020-06-08 | 2020-09-15 | 宁波交通工程建设集团有限公司 | Solidified soil roadbed structure and design method thereof |
-
2001
- 2001-11-29 CN CNB011430206A patent/CN1170036C/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102352589A (en) * | 2011-07-21 | 2012-02-15 | 济南城建集团有限公司 | Construction method for road base concrete side mold |
| CN102352589B (en) * | 2011-07-21 | 2013-06-12 | 济南城建集团有限公司 | Construction method for road base concrete side mold |
| CN106835881A (en) * | 2017-02-24 | 2017-06-13 | 陈益民 | Prefabricated concrete structure layer wedge bearing spline plate flexible pavement |
| CN111119012A (en) * | 2019-12-22 | 2020-05-08 | 郑建遇 | Composite road building construction method |
| CN111119012B (en) * | 2019-12-22 | 2021-12-24 | 郑建遇 | Composite road building construction method |
| CN111663387A (en) * | 2020-06-08 | 2020-09-15 | 宁波交通工程建设集团有限公司 | Solidified soil roadbed structure and design method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1170036C (en) | 2004-10-06 |
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