CN104458398B - Semi-rigid base asphalt pavement reflection crack testing device - Google Patents
Semi-rigid base asphalt pavement reflection crack testing device Download PDFInfo
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Abstract
The invention discloses a semi-rigid base asphalt pavement reflection crack testing device. The semi-rigid base asphalt pavement reflection crack testing device adopts the structure as follows: a steel tank is filled with a subgrade, a subbase, a semi-rigid base, a sealing layer and a surface layer are sequentially from bottom to top; a first steel plate and a second steel plate are vertically embedded into the semi-rigid base; a steel tube is horizontally embedded into the semi-rigid base and penetrates through the steel tank; a dowel bar penetrates through one end of the steel tube and is welded to the second steel plate; the other end of the dowel bar is connected with a hollow hydraulic jack through a nut; the bottom of the hollow hydraulic jack is connected with the steel tank through a bolt; a displacement sensor is in horizontal contact with the free end of the dowel bar; a crack meter is embedded into the surface layer. The semi-rigid base asphalt pavement reflection crack testing device is simple in structure and convenient to use, particularly, can control the expansion speed of an semi-rigid base crack by controlling the jacking rate of the hollow hydraulic jack, and can simulate influence of different extension rates of the semi-rigid base crack on an evolution law of the asphalt pavement reflection crack, so that the semi-rigid base asphalt pavement reflection crack testing device enables indoor test accuracy to be higher, more reliable and more effective.
Description
Technical field
The present invention relates to a kind of technical field for the test of highway Reflective Crack over Asphalt Pavement with Semi-rigid, being more particularly to the assay device of a kind of Reflective Crack over Asphalt Pavement with Semi-rigid, it is applicable to a kind of highway Reflective Crack over Asphalt Pavement with Semi-rigid of simulating and produces, extends and the test developed.
Background technology
Asphalt concrete pavement semi-rigid type base is to use the stable soil of the inorganic adhesions such as cement, Calx, flyash or pellet, form through paving, rolling, it is mainly used in sub-surface, its rigidity between rigid material (cement concrete) and flexible material (asphalt), the most normally referred to as semi-rigid type base.Owing to semi-rigid type base has preferable plate body feature and higher intensity, the bearing capacity of asphalt pavement structure, beneficially load diffusion can be effectively improved, reduce the vertical compressive stress of subgrade soils, and the advantage such as construction costs is cheap, it is currently topmost substrate type in China Higher level highway.
But semi-rigid sub-base material has some defect itself and deficiency, particularly semi-rigid material is difficult to temperature contracting and the Dry Shrinkage Performance overcome, directly result in semi-rigid type base several years even some months after making and crack occurs, and progressively to pavement surface structure extending, eventually enter into surface layer, cause asphalt surface course to produce reflection crack.Rainwater from top-crack under ooze, enter accumulation in the middle of surface layer and basic unit, reduce the bond state between bituminous paving and semi-rigid type base, the most easy induction purt mud phenomenon under dynamic hydraulic pressure effect, thus accelerate the damage of asphalt pavement structure.
Issued 2013 year traffic carrier statistical communique of developments according to Department of Transportation, by 2013 the end of the year whole nation total mileage of highway reach 435.62 ten thousand kilometers, the whole nation highway mileage reach 10.44 ten thousand kilometers.To " 12 " end, China's highway total kilometrage is up to 120,000 km.
According to incompletely statistics China's bituminous paving uses the ratio of semi-rigid type base more than 80%, cause pavement disease due to Semi-rigid Base Reflective Crevice every year, shorten service life of road surface, strengthen maintenance cost even medium-capital overhauling cost hundreds of millions of.Engineering circles is the most consistent with academia thinks that the discussion formation of reflection crack, the extension of reflection crack and preventing and treating have highly important meaning.
But it is to produce under load temperature humidity coupling that cracks in semi-rigid base course produces, generation opportunity and generation position are difficult to prediction, research worker is made to be difficult to observe, thus a kind of brand-new assay device must be invented and carry out simulating semi-rigid basic crack and produce induction bituminous paving and launch crack and produce and development, it is achieved to Semi-rigid Pavement of Asphalt reflection crack and the observation of bituminous concrete cracking resistance and research.
Summary of the invention
It is an object of the invention to there are provided the assay device of a kind of Reflective Crack over Asphalt Pavement with Semi-rigid, simple in construction, easy to use, especially can eject speed by control hollow hydraulic jack and control cracks in semi-rigid base course expansion rate, the different cracks in semi-rigid base course expansion rate impact on asphalt pavement reflective cracking Evolution can be simulated so that laboratory test precision is higher, more reliable, more effective.
In order to realize above-mentioned purpose, the present invention uses techniques below measure:
The assay device of a kind of simulating semi-rigid Base Asphalt Pavement reflection crack, including steel tank；Soil matrix, underlayment, semi-rigid type base, sealing and the pavement surface structure filled the most successively in steel tank；The steel plate that is embedded in semi-rigid type base, steel pipe；Dowel steel；Hollow hydraulic jack；Displacement transducer, slit gauge.It is characterized in that: soil matrix, underlayment, semi-rigid type base, sealing and surface layer fill in steel tank the most successively, first steel plate, the second steel plate are embedded in semi-rigid type base the most in advance, steel pipe level is embedded in semi-rigid type base, and pass from steel tank, dowel steel is through steel pipe one end and the second Plate Welding, other end nut is connected with hollow hydraulic jack, it is connected with steel tank bottom hollow hydraulic jack, displacement transducer and dowel steel free end flat contact, slit gauge is embedded in surface layer.
Described dowel steel one end is fabricated to screw thread, the other end and the second Plate Welding.
Between the second described steel plate and steel pipe, reserved spacing λ should be greater than equal to test expection cracks in semi-rigid base course width.
Surface layer, sealing, semi-rigid type base, underlayment, soil matrix are in order at laboratory simulation highway subgrade ~ each structure sheaf in road surface.
Two block plates being embedded in semi-rigid type base, motionless by fixing one piece of pre-embedded steel slab, change the position of other one piece of pre-embedded steel slab, so that semi-rigid type base produces crack, it is possible to come simulating semi-rigid basic unit Wensu and desciccation crack and the speed of crack generation by the speed controlling two pieces of pre-embedded steel slab spacing and generation spacing.
The embedded steel tube being embedded in semi-rigid type base, for common coating steel pipe, is used for isolating dowel steel and semi-rigid type base, reduces the frictional force between dowel steel and semi-rigid type base.
Hollow hydraulic jack, supports using steel tank as counter-force, applies pull strength to dowel steel, thus drives pre-embedded steel slab, makes semi-rigid type base produce crack.
Displacement sensor dowel steel lateral displacement, this displacement is the width of cracks in semi-rigid base course.
Slit gauge is for measuring the width in crack in surface layer.
In sum, constitute pull strength counter force system by hollow hydraulic jack, steel tank, by dowel steel, pull strength is transferred to steel plate, so that semi-rigid type base produces crack, in crack reflection to surface layer.Use the real-time width of reflection crack that displacement transducer and slit gauge are measured in semi-rigid type base in the real-time width in crack and surface layer respectively, produce and the model test of evolutionary process it is achieved thereby that launch crack at laboratory test room simulating semi-rigid basic crack and induction bituminous paving thereof, it is achieved to Semi-rigid Pavement of Asphalt reflection crack and the observation of bituminous concrete cracking resistance and research.
The present invention is applicable to semi-rigid type base cracking induction bituminous paving and launches crack Emergence and Development and evolution indoor model test and on-the-spot test, applies also for the test of bituminous paving cracking resistance.
The invention have the advantage that assay device is simple, processing ease, simulation test mechanism is clear and definite, and method is reliable, in particular so that can realize cracks in semi-rigid base course in laboratory test room and induce bituminous paving and launch the model test that crack produces and develops.Eject speed by control hollow hydraulic jack and control cracks in semi-rigid base course expansion rate, it is achieved thereby that the different cracks in semi-rigid base course expansion rate experimental study to asphalt pavement reflective cracking Evolution of simulation.It can in addition contain this assay device to be applied to highway semi-rigid type base scene test long-term behaviour monitoring.
Accompanying drawing explanation
Fig. 1 is the structural representation of the assay device of a kind of Reflective Crack over Asphalt Pavement with Semi-rigid；
Fig. 2 is the top view of the assay device of a kind of Reflective Crack over Asphalt Pavement with Semi-rigid；
Fig. 3 is the A A profile in the assay device of a kind of Reflective Crack over Asphalt Pavement with Semi-rigid；
Fig. 4 is the B B profile in the assay device of a kind of Reflective Crack over Asphalt Pavement with Semi-rigid；
Fig. 5 is a kind of second steel plate 8b and dowel steel connection diagram；
Fig. 6 is a kind of dowel steel end thread section P close-up schematic view；
Fig. 7 is Q close-up schematic view in a kind of Fig. 2；
Fig. 8 is the photo of a kind of hollow hydraulic jack.
Position and corresponding labelling in figure: surface layer 1, sealing 2, semi-rigid type base 3, underlayment 4, soil matrix 5, steel tank 6, hollow hydraulic jack 7(Zhejiang developing EXPRRH-6010), the first steel plate 8a, the second steel plate 8b, dowel steel 9, steel pipe 10, bolt 11, nut 12, the bright KTR-10mm of displacement transducer 13(rice), slit gauge 14(Beijing Ji Kang BGK-4400).
Detailed description of the invention
Below in conjunction with the accompanying drawings the present invention is described in further detail:
According to Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7, Fig. 8, the assay device of a kind of Reflective Crack over Asphalt Pavement with Semi-rigid, it is made up of surface layer 1, sealing 2, semi-rigid type base 3, underlayment 4, soil matrix 5, steel tank 6, hollow hydraulic jack the 7, first steel plate 8a, the second steel plate 8b, dowel steel 9, steel pipe 10, bolt 11, nut 12, displacement transducer 13, slit gauge 14.It is characterized in that: soil matrix 5, underlayment 4, semi-rigid type base 3, sealing 2 and surface layer 1 fill in steel tank 6 the most successively, first steel plate 8a, second steel plate 8b is embedded in semi-rigid type base 3 the most in advance, steel pipe 10 level is embedded in semi-rigid type base 3, and pass from steel tank 6, dowel steel 9 is connected with hollow hydraulic jack 7 through steel pipe 10 one end with the second steel plate (8b) welding other end nut 12, it is connected with steel tank 6 bolt 11 bottom hollow hydraulic jack 7, displacement transducer 13 and dowel steel 9 free end flat contact, slit gauge 14 is embedded in surface layer 1.
Soil matrix 5, underlayment 4, semi-rigid type base 3, sealing 2 and surface layer 1 fill in steel tank 6 in order to simulate each structure sheaf of highway subgrade ~ bituminous paving successively according to the requirement of compactness in " highway subgrade design specification " (JTG D30-2004) and " standard specification for construction and acceptance of highway asphalt pavement " (JTG F40-2004) from bottom to up.Its annexation is: soil matrix 5, underlayment 4, semi-rigid type base 3, sealing 2 and surface layer 1 fill from bottom to up in steel tank 6, and compactness and flatness should meet People's Republic of China's industry standard " highway subgrade design specification " (JTG D30-2004) and the requirement of " standard specification for construction and acceptance of highway asphalt pavement " (JTG F40-2004).
The material of described surface layer 1 be bituminous concrete, the material of sealing 2 be that asphalt macadam, semi-rigid type base 3 and underlayment 4 material are generally inorganic colloid methoder or the pellets such as cement, Calx, flyash, surface layer 1, sealing 2, semi-rigid type base 3, underlayment 4 material and thickness are typically based on the simulation actual ground surface material in section and Thickness, soil matrix 5 is typically taking 50cm thickness, compactness is more than 96%, and the soil matrix 5 top modulus of resilience should be greater than 40MPa.
First steel plate 8a is embedded in semi-rigid type base 3, it is desirable to the first steel plate 8a in semi-rigid type base 3 vertically and maintain static.Second steel plate 8b is embedded in semi-rigid type base 3 equally, it is desirable to the second steel plate 8b vertically and can move in semi-rigid type base 3 under the External Force Acting of dowel steel 9 round about.These effects connected are: motionless by fixing one piece of first steel plate 8a, change the position of other one piece of second steel plate 8b, so that generation crack in semi-rigid type base 3, it is possible to carry out, by the speed controlling two piece of first steel plate 8a and the spacing of the second steel plate 8b and generation spacing, the speed that the temperature contracting of simulating semi-rigid basic unit 3 produces with desciccation crack and crack.
By being welded to connect between second steel plate 8b and dowel steel 9.These effects connected are: overall by being welded as rigidity between the second steel plate 8b and dowel steel 9, it is possible to the external force on dowel steel 9 is entirely delivered to steel plate 8b, so that producing crack in semi-rigid type base 3.
Steel pipe 10 is common coating steel pipe, is embedded in semi-rigid type base 3, and passes from steel tank 6, and dowel steel 9 passes from steel pipe 10.The diameter of steel pipe 10 should be greater than the diameter 20mm of dowel steel 9.These effects connected are: steel pipe 10 is used for isolating dowel steel 9 and semi-rigid type base 3, eliminates the frictional force between dowel steel 9 and semi-rigid type base 3.
Between the second steel plate 8b and steel pipe (10), reserved spacing λ should be greater than equal to test expection cracks in semi-rigid base course width, in order to when guarantee test is loaded onto semi-rigid type base 3 maximum crack width, does not have rigid contact between the second steel plate 8b and steel pipe 10.
Being connected with steel tank 6 by hollow hydraulic jack 7 with bolt 11, dowel steel 9 uses through hollow hydraulic jack 7 with nut 12 threadeds.These effects connected are: so connect and steel tank 6 can be made to support as counter-force, apply pull strength by hollow hydraulic jack 7, pass to steel plate 8b by nut 12 and dowel steel 9, so that producing crack in semi-rigid type base 3.
Displacement transducer 13 and dowel steel 9 free end point cantact, direction horizontal positioned.These effects connected are: by the horizontal displacement of displacement sensor dowel steel 9, and this horizontal displacement value is equal to the spacing between the first steel plate 8a and the second steel plate 8b, the namely fracture width of semi-rigid type base 3 in test.
Slit gauge 14(Beijing Ji Kang BGK-4400) horizontally embedded in surface layer 1.Typically slit gauge 14 center line and the first steel plate 8a center line should be overlapped when burying underground.Slit gauge 14(Beijing Ji Kang BGK-4400) sensitivity≤0.025%F S, precision≤± 0.1%F S, operating temperature-20 DEG C～80 DEG C, range 25mm.
In sum, the present invention constitutes pull strength counter force system by steel tank 6, hollow hydraulic jack 7, by dowel steel 9, pull strength is transferred to steel plate 8a, so that produce crack in semi-rigid type base 3, in crack reflection to surface layer 1.Displacement transducer 13, slit gauge 14 is used to measure in semi-rigid type base 3 the real-time width of reflection crack in real-time fracture width and surface layer 1 respectively, produce and the model test of evolutionary process it is achieved thereby that launch crack at laboratory test room simulating semi-rigid basic crack and induction bituminous paving thereof, it is achieved to Semi-rigid Pavement of Asphalt reflection crack and the observation of bituminous concrete cracking resistance and research.
A kind of assay device energy simulating semi-rigid basic crack produces thus induces bituminous paving and launch the assay device that crack produces and develops, it makes to realize cracks in semi-rigid base course in laboratory test room and induces bituminous paving and launch the model test that crack produces and develops, the present invention has filled up the blank of domestic semi-rigid base asphalt pavement reflective cracking simulation test device, research semi-rigid asphalt pavement is launched Fracture Evolution rule and crack important in inhibiting is launched in preventing and treating.Its simple in construction, easy to use, especially can eject speed by control hollow hydraulic jack and control cracks in semi-rigid base course expansion rate, the different cracks in semi-rigid base course expansion rate impact on asphalt pavement reflective cracking Evolution can be simulated so that laboratory test precision is higher, more reliable, more effective.
Claims (3)
- null1. the assay device of a Reflective Crack over Asphalt Pavement with Semi-rigid，This assay device is by surface layer (1)、Sealing (2)、Semi-rigid type base (3)、Underlayment (4)、Soil matrix (5)、Steel tank (6)、Hollow hydraulic jack (7)、First steel plate (8a)、Second steel plate (8b)、Dowel steel (9)、Steel pipe (10)、Bolt (11)、Nut (12)、Displacement transducer (13)、Slit gauge (14) forms，It is characterized in that: soil matrix (5)、Underlayment (4)、Semi-rigid type base (3)、Sealing (2) and surface layer (1) fill in steel tank (6) the most successively，First steel plate (8a)、Second steel plate (8b) is vertically embedded in semi-rigid type base (3) in advance，Steel pipe (10) level is embedded in semi-rigid type base (3)，And pass from steel tank (6)，Dowel steel (9) welds through steel pipe (10) one end with the second steel plate (8b)，Other end nut (12) is connected with hollow hydraulic jack (7)，Hollow hydraulic jack (7) bottom is connected with steel tank (6) bolt (11)，Displacement transducer (13) and dowel steel (9) free end flat contact，Slit gauge (14) is embedded in surface layer (1).
- The assay device of a kind of Reflective Crack over Asphalt Pavement with Semi-rigid the most according to claim 1, it is characterised in that: described dowel steel (9) one end is fabricated to screw thread, the other end and the second steel plate (8b) welding.
- A kind of assay device of Reflective Crack over Asphalt Pavement with Semi-rigid, it is characterised in that: between the second steel plate (8b) and steel pipe (10), reserved spacing λ is more than or equal to test expection cracks in semi-rigid base course width.
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| CN105527165B (en) * | 2016-02-02 | 2018-07-24 | 山东省交通科学研究院 | A kind of asphalt pavement crack load response relative displacement test method and test device |
| CN105738230B (en) * | 2016-04-30 | 2018-09-14 | 山西省交通科学研究院 | A kind of asphalt Reflection Cracking performance testing device and test method |
| CN106381793A (en) * | 2016-08-30 | 2017-02-08 | 中冶天工集团天津有限公司 | Arrangement method for dowel bars of cement-concrete pavement |
| CN107860665B (en) * | 2017-10-30 | 2020-04-14 | 长沙理工大学 | Testing method for rigid-flexible composite pavement structure track |
| CN110837082B (en) * | 2019-11-27 | 2022-09-30 | 东南大学 | Testing device and testing method for detecting ground penetrating radar of pavement cracks |
| CN110865370B (en) * | 2019-11-27 | 2022-09-30 | 东南大学 | Ground penetrating radar detection test device and method for loose and accumulated water positions in road |
| CN112432850B (en) * | 2020-11-16 | 2021-07-23 | 河海大学 | Three-way independent loading novel mixed boundary true triaxial apparatus |
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