CN104458398A - 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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- CN104458398A CN104458398A CN201410690614.7A CN201410690614A CN104458398A CN 104458398 A CN104458398 A CN 104458398A CN 201410690614 A CN201410690614 A CN 201410690614A CN 104458398 A CN104458398 A CN 104458398A
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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, more specifically relate to a kind of test unit of Reflective Crack over Asphalt Pavement with Semi-rigid, it is applicable to a kind of test of simulating highway Reflective Crack over Asphalt Pavement with Semi-rigid and producing, expanding and develop.
Background technology
Bituminous concrete pavement semi-rigid type base adopts inorganic adhesion Stabilized Soil or the pellets such as cement, lime, flyash, form through paving, rolling, be mainly used in sub-surface, its rigidity, between rigid material (cement concrete) and flexible material (asphalt), is therefore referred to as semi-rigid type base usually.Because semi-rigid type base has the higher intensity of good plate body characteristic sum, effectively can improve the bearing capacity of asphalt pavement structure, be conducive to load diffusion, reduce the vertical compressive stress of subgrade soils, and the advantage such as construction costs is cheap, be topmost substrate type in China Higher level highway at present.
But semi-rigid sub-base material has some defect itself and deficiency, the temperature that particularly semi-rigid material is difficult to overcome contracts and Dry Shrinkage Performance, directly cause semi-rigid type base after making several years even some months there is crack, and progressively extend to pavement surface structure expansion, finally enter surface layer, cause asphalt mat to produce reflection crack.Rainwater from top-crack under ooze, enter in the middle of surface layer and basic unit and gather, reduce the bond state between bituminous pavement and semi-rigid type base, under dynamic hydraulic pressure effect, easily bring out again purt mud phenomenon, thus accelerate the damage of asphalt pavement structure.
Issued 2013 year traffic carrier statistical communique of developments according to Department of Transportation, by reaching 435.62 ten thousand kilometers to national total mileage of highway at 2013 end of the years, national highway mileage reaches 10.44 ten thousand kilometers.To " 12 " end, China's highway total kilometrage will reach 120,000 km.
Adopt the ratio of semi-rigid type base more than 80% according to incompletely statistics in China's bituminous pavement, every year because Semi-rigid Base Reflective Crevice causes pavement disease, shorten service life of road surface, even medium-capital overhauling cost is hundreds of millions of to strengthen maintenance cost.Engineering circles and academia are all consistent thinks that inquiring into the formation of reflection crack, the expansion of reflection crack and control has very important meaning.
But it is in load-temperature that cracks in semi-rigid base course produces---produce under humidity coupling, generation opportunity and generation position are difficult to prediction, researchist is made to be difficult to observation, thus must invent a kind of brand-new test unit to carry out simulating semi-rigid basic crack and produce and bring out bituminous pavement and launch crack producing and developing, realize the observation to Semi-rigid Pavement of Asphalt reflection crack and bituminous concrete cracking resistance and research.
Summary of the invention
The object of the invention is the test unit that there are provided a kind of Reflective Crack over Asphalt Pavement with Semi-rigid, structure is simple, easy to use, especially speed is ejected to control cracks in semi-rigid base course expansion rate by controlling hollow hydraulic lifting jack, different cracks in semi-rigid base course expansion rate can be simulated on the impact of asphalt pavement reflective cracking Evolution, make shop experiment precision higher, more reliably, more effective.
In order to realize above-mentioned object, the present invention adopts following technical measures:
A test unit for simulating semi-rigid Base Asphalt Pavement reflection crack, comprises steel tank; The soil matrix filled successively from bottom to up in steel tank, subbase, semi-rigid type base, sealing and pavement surface structure; Be embedded in the steel plate in semi-rigid type base, steel pipe; Transmission rod; Hollow hydraulic lifting jack; Displacement transducer, slit gauge.It is characterized in that: soil matrix, subbase, semi-rigid type base, sealing and surface layer fill in steel tank from bottom to up successively, first steel plate, the second steel plate are vertically embedded in semi-rigid type base in advance, steel pipe level is embedded in semi-rigid type base, and pass from steel tank, transmission rod is through steel pipe one end and the second Plate Welding, other end nut is connected with hollow hydraulic lifting jack, be connected with steel tank bolt bottom hollow hydraulic lifting jack, displacement transducer and transmission rod free end flat contact, slit gauge is embedded in surface layer.
Described transmission rod one end is made into screw thread, the other end and the second Plate Welding.
Between the second described steel plate and steel pipe, reserved spacing λ should be more than or equal to test and expects cracks in semi-rigid base course width.
Surface layer, sealing, semi-rigid type base, subbase, soil matrix are in order at each structural sheet in laboratory simulation highway subgrade ~ road surface.
Be embedded in two block plates 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, thus make semi-rigid type base produce crack, and the speed of simulating semi-rigid basic unit Wensu and desciccation crack and crack generation can be carried out by the speed controlling two pieces of pre-embedded steel slab spacing and generation spacing.
Being embedded in the embedded steel tube in semi-rigid type base, is common coating steel pipe, for isolating transmission rod and semi-rigid type base, reduces the friction force between transmission rod and semi-rigid type base.
Hollow hydraulic lifting jack, supports using steel tank as counter-force, applies tractive force to transmission rod, thus drives pre-embedded steel slab, makes semi-rigid type base produce crack.
Displacement sensor transmission rod transversal 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 tractive force-counter force system, by transmission rod, tractive force is passed to steel plate by hollow hydraulic lifting jack, steel tank, thus make to produce crack in semi-rigid type base, crack reflection is in surface layer.Displacement transducer and slit gauge is used to measure the real-time width of reflection crack in semi-rigid type base in the real-time width in crack and surface layer respectively, thus achieve at shop experiment room simulating semi-rigid basic crack and bring out bituminous pavement and launch crack and produce and the model test of evolutionary process, realize the observation to Semi-rigid Pavement of Asphalt reflection crack and bituminous concrete cracking resistance and research.
The present invention is applicable to semi-rigid type base cracking and brings out bituminous pavement and launch crack Emergence and Development and evolution indoor model test and site test, is also applicable to the test of bituminous pavement cracking resistance.
Advantage of the present invention is: test unit is simple, processing ease, and simulation test mechanism is clear and definite, and method is reliable, particularly makes realize cracks in semi-rigid base course in shop experiment room and brings out bituminous pavement transmitting crack generation and the model test developed.Eject speed by control hollow hydraulic lifting jack and control cracks in semi-rigid base course expansion rate, thus achieve the different cracks in semi-rigid base course expansion rate of simulation to the experimental study of asphalt pavement reflective cracking Evolution.This test unit can also be applied to the monitoring of highway semi-rigid type base site test long-term behaviour in addition.
Accompanying drawing explanation
Fig. 1 is a kind of structural representation of test unit of Reflective Crack over Asphalt Pavement with Semi-rigid;
Fig. 2 is a kind of vertical view of test unit of Reflective Crack over Asphalt Pavement with Semi-rigid;
Fig. 3 is the A-A sectional view in a kind of test unit of Reflective Crack over Asphalt Pavement with Semi-rigid;
Fig. 4 is the B-B sectional view in a kind of test unit of Reflective Crack over Asphalt Pavement with Semi-rigid;
Fig. 5 is a kind of second steel plate 8b and transmission rod connection diagram;
Fig. 6 is a kind of transmission rod 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 a kind of photo of hollow hydraulic lifting jack.
Position and corresponding mark in figure: surface layer 1, sealing 2, semi-rigid type base 3, subbase 4, soil matrix 5, steel tank 6, hollow hydraulic lifting jack 7(Zhejiang developing EXPRRH-6010), the first steel plate 8a, the second steel plate 8b, transmission rod 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).
Embodiment
Below in conjunction with accompanying drawing, 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, a test unit for Reflective Crack over Asphalt Pavement with Semi-rigid, it is made up of surface layer 1, sealing 2, semi-rigid type base 3, subbase 4, soil matrix 5, steel tank 6, hollow hydraulic lifting jack 7, first steel plate 8a, the second steel plate 8b, transmission rod 9, steel pipe 10, bolt 11, nut 12, displacement transducer 13, slit gauge 14.It is characterized in that: soil matrix 5, subbase 4, semi-rigid type base 3, sealing 2 and surface layer 1 fill in steel tank 6 from bottom to up 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, transmission rod 9 welds other end nut 12 through steel pipe 10 one end with the second steel plate (8b) and is connected with hollow hydraulic lifting jack 7, be connected with steel tank 6 bolt 11 bottom hollow hydraulic lifting jack 7, displacement transducer 13 and transmission rod 9 free end flat contact, slit gauge 14 is embedded in surface layer 1.
Soil matrix 5, subbase 4, semi-rigid type base 3, sealing 2 and surface layer 1 fill in steel tank 6 in order to simulate each structural sheet of highway subgrade ~ bituminous pavement successively according to the requirement of compactness in " highway subgrade design specifications " (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, subbase 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 the requirement of People's Republic of China's industry standard " highway subgrade design specifications " (JTG D30-2004) and " standard specification for construction and acceptance of highway asphalt pavement " (JTG F40-2004).
The material of described surface layer 1 is bituminous concrete, the material of sealing 2 is asphalt macadam, semi-rigid type base 3 and subbase 4 material are generally inorganic colloid methoder or the pellets such as cement, lime, flyash, surface layer 1, sealing 2, semi-rigid type base 3, subbase 4 material and thickness are generally according to the simulation actual ground surface material in section and Thickness, soil matrix 5 is generally to get 50cm thick, compactness is greater 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, requires 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, requires the second steel plate 8b in semi-rigid type base 3 vertically and can move round about under the External Force Acting of transmission rod 9.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, thus make to produce crack in semi-rigid type base 3, and the temperature contracting of simulating semi-rigid basic unit 3 and the speed of desciccation crack and crack generation can be come by the speed of the spacing and generation spacing that control two piece of first steel plate 8a and the second steel plate 8b.
By being welded to connect between second steel plate 8b and transmission rod 9.These effects connected are: by being welded as rigid unitary between the second steel plate 8b and transmission rod 9, the external force on transmission rod 9 can be entirely delivered to steel plate 8b, thus make to produce 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 transmission rod 9 passes from steel pipe 10.The diameter of steel pipe 10 should be greater than the diameter 20mm of transmission rod 9.These effects connected are: steel pipe 10, for isolating transmission rod 9 and semi-rigid type base 3, eliminates the friction force between transmission rod 9 and semi-rigid type base 3.
Between the second steel plate 8b and steel pipe (10), reserved spacing λ should be more than or equal to test and expects and so that when warranty test is loaded on semi-rigid type base 3 maximum crack width, do not have rigid contact between the second steel plate 8b and steel pipe 10 by cracks in semi-rigid base course width.
Be connected with steel tank 6 by hollow hydraulic lifting jack 7 with bolt 11, transmission rod 9 adopts with nut 12 through hollow hydraulic lifting jack 7 and is threaded.These effects connected are: connect like this and steel tank 6 can be made to support as counter-force, apply tractive force, pass to steel plate 8b by nut 12 and transmission rod 9, thus make to produce crack in semi-rigid type base 3 by hollow hydraulic lifting jack 7.
Displacement transducer 13 and transmission rod 9 free end point cantact, direction horizontal positioned.These effects connected are: by the horizontal shift of displacement sensor transmission rod 9, this horizontal shift value equals the spacing between the first steel plate 8a and the second steel plate 8b, the fracture width of semi-rigid type base 3 in namely testing.
Slit gauge 14(Beijing Ji Kang BGK-4400) horizontally embedded in surface layer 1.Generally slit gauge 14 center line should be overlapped with the first steel plate 8a center line when burying underground.Slit gauge 14(Beijing Ji Kang BGK-4400) sensitivity≤0.025%FS, precision≤± 0.1%FS, working temperature-20 DEG C ~ 80 DEG C, range 25mm.
In sum, the present invention constitutes tractive force-counter force system by steel tank 6, hollow hydraulic lifting jack 7, by transmission rod 9, tractive force is passed to steel plate 8a, thus makes to produce crack in semi-rigid type base 3, and crack reflection is in 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, thus achieve at shop experiment room simulating semi-rigid basic crack and bring out bituminous pavement and launch crack and produce and the model test of evolutionary process, realize the observation to Semi-rigid Pavement of Asphalt reflection crack and bituminous concrete cracking resistance and research.
A kind of test unit energy simulating semi-rigid basic crack produces thus brings out the test unit that bituminous pavement launches crack producing and developing, it makes realize cracks in semi-rigid base course in shop experiment room and brings out the model test that bituminous pavement launches crack generation and evolution, the present invention has filled up the blank of domestic semi-rigid base asphalt pavement reflective cracking simulation test device, launches Fracture Evolution rule and control transmitting crack important in inhibiting to research semi-rigid asphalt pavement.Its structure is simple, easy to use, especially speed is ejected to control cracks in semi-rigid base course expansion rate by controlling hollow hydraulic lifting jack, different cracks in semi-rigid base course expansion rate can be simulated on the impact of asphalt pavement reflective cracking Evolution, make shop experiment precision higher, more reliably, more effective.
Claims (3)
1. a test unit for Reflective Crack over Asphalt Pavement with Semi-rigid, this test unit is by surface layer (1), sealing (2), semi-rigid type base (3), subbase (4), soil matrix (5), steel tank (6), hollow hydraulic lifting jack (7), first steel plate (8a), second steel plate (8b), transmission rod (9), steel pipe (10), bolt (11), nut (12), displacement transducer (13), slit gauge (14) forms, and it is characterized in that: soil matrix (5), subbase (4), semi-rigid type base (3), sealing (2) and surface layer (1) fill in steel tank (6) from bottom to up successively, the 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), transmission rod (9) welds with the second steel plate (8b) through steel pipe (10) one end, other end nut (12) is connected with hollow hydraulic lifting jack (7), hollow hydraulic lifting jack (7) bottom is connected with steel tank (6) bolt (11), displacement transducer (13) and transmission rod (9) free end flat contact, slit gauge (14) is embedded in surface layer (1).
2. the test unit of a kind of Reflective Crack over Asphalt Pavement with Semi-rigid according to claim 1, is characterized in that: described transmission rod (9) one end is made into screw thread, and the other end welds with the second steel plate (8b).
3. the test unit of a kind of Reflective Crack over Asphalt Pavement with Semi-rigid according to claim 1, is characterized in that: between the second steel plate (8b) and steel pipe (10), reserved spacing λ is more than or equal to test and expects cracks in semi-rigid base course width.
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| 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 |
| CN107860665A (en) * | 2017-10-30 | 2018-03-30 | 长沙理工大学 | A kind of method of testing of Rigid-flexible composite of the road structure rut |
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| CN110837082A (en) * | 2019-11-27 | 2020-02-25 | 东南大学 | Testing device and testing method for detecting ground penetrating radar of pavement cracks |
| CN110865370A (en) * | 2019-11-27 | 2020-03-06 | 东南大学 | Ground penetrating radar detection test device and method for loose and accumulated water positions in road |
| CN112432850A (en) * | 2020-11-16 | 2021-03-02 | 河海大学 | Three-way independent loading novel mixed boundary true triaxial apparatus |
| 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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