CN105806695A - Viscoelasticity springback deformation based pavement detection equipment - Google Patents
Viscoelasticity springback deformation based pavement detection equipment Download PDFInfo
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- CN105806695A CN105806695A CN201610114712.5A CN201610114712A CN105806695A CN 105806695 A CN105806695 A CN 105806695A CN 201610114712 A CN201610114712 A CN 201610114712A CN 105806695 A CN105806695 A CN 105806695A
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- viscoelasticity
- harvester
- detection equipment
- pavement detection
- charger
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/0076—Hardness, compressibility or resistance to crushing
- G01N2203/0083—Rebound strike or reflected energy
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- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention relates to viscoelasticity springback deformation based pavement detection equipment. The viscoelasticity springback deformation based pavement detection equipment comprises three parts, namely a loading device, a collection device and an analysis device, wherein a load time travel curve provided by the loading device is recorded and dynamic rebound deflection data is detected and stored in real time; typical sample libraries corresponding to different loading conditions and to-be-detected materials are built; the overall bearing capacity of a structure is evaluated through viscoelasticity parameters or nonlinear dynamic elastic modulus and the like. According to the invention, the deflection size cannot be used as an absolute standard for evaluating the usability of the pavement structure; the overall bearing capacity of the structure is evaluated by dynamic changing parameters; and the contradiction that a deflection test result does not conform to an actual structure status in existing specification frequently is avoided.
Description
Technical field
The present invention relates to a kind of Road Detection equipment, more specifically use the equipment of dynamic rebound deflection data evaluation road structure integrated carrying ability.
Background technology
When measuring road structure bearing capacity, it is most commonly used that use flexure index.Current engineering widely uses backman beam and measures flexure, and as the standard method of pavement deflection detection and completion, IMM algorithm.The measuring method of specification is that benkelman beams deflectometer inserts the gap place between automobile back wheel, automobile slowly moves ahead, the maximum reached by dial gauge is as initial reading, automobile is sailed out of after the flexure radius of influence dial gauge gyrostabilized platform value as end readout, the twice of initial reading and end readout difference is exactly rebound deflection value, and this value is more little shows that road structure integrated carrying ability is more strong.
But in a lot of situations, the result of its detection but has very big difference with the situation of actual pavement structure, and the rebound deflection value such as the asphalt concrete pavement of season cracking may be only small, additionally when reads end readout and also can evaluation result be had a significant impact.Inventor is by carrying out dynamic rebound deflection detection to the bituminous paving using a period of time, find after detection vehicle sails out of in 10s, the rebound velocity of damage location flexure to be significantly greater than the value of lossless point, and this shows that the situation of pavement structure and the rebound velocity of flexure also exist certain and contact.
Summary of the invention
It is an object of the invention to provide a kind of equipment gathered and process dynamic rebound deflection data, road structure integrated carrying ability can be evaluated fast and effectively, solve issue noted above.
The present invention provides a kind of pavement detection equipment based on viscoelasticity resilience, including charger, harvester and analytical equipment, described harvester is arranged on the right side of charger, by testing beam connection between described charger and harvester, described analytical equipment is arranged on above harvester, it is connected by electric wire between described analytical equipment and harvester, described test beam terminal is provided with fulcrum, described test beam left end is provided with measuring point induction apparatus, after described harvester obtains dynamic rebound deflection time course data, analytical equipment carrys out the integrated carrying ability of evaluation structure by data bases such as viscoelastic parameters or Nonlinear Dynamic elastic modelling quantity.
Further improvement is that: described charger is standard axle load vehicle or the various forms such as hydraulic jack or drop impact, it is necessary to the time-history curves that record loads.
Further improvement is that: described harvester comprises displacement transducer, data storage and portable printer etc., can detect and store dynamic rebound deflection data in real time.
Further improvement is that: when described charger is standard axle load vehicle, vehicle side arranges two groups of tires, and often group tire is two, often organizes and is connected by standard axle load car rear axle between described tire, and described measuring point induction apparatus is often being organized between tire.
Further improvement is that: described fulcrum is adjustable to the optional position of test beam.
The invention has the beneficial effects as follows: the contradiction that and practical structures present situation normal for existing deflection testing result is not inconsistent, the size proposing flexure as the absolute standard evaluating pavement structure serviceability, can not judge that by the rate of change of rebound deflection the serviceability of pavement structure judges have the better suitability than by the size of flexure.By detecting and store the time course data of dynamic rebound deflection, be conducive to choosing the test data time period of energy rational evaluation road structure integrated carrying ability.The typical sample storehouse corresponding to different loading conditions and material to be detected can be set up, can promote the use of rapidly after being depicted as nomogram handbook.
Accompanying drawing explanation
Fig. 1 is the structural representation of the present invention.
Fig. 2 is the rearview that charger is standard axle load vehicle of the present invention.
Fig. 3 is the dynamic rebound deflection curve of each test point of the present invention.
Fig. 4 is the typical sample database data figure of the present invention.
Fig. 5 is the measured data figure of the present invention.
Wherein: 1-charger, 2-harvester, 3-analytical equipment, 4-tests beam, 5-fulcrum, 6-measuring point induction apparatus, 7-standard axle load car rear axle.
Detailed description of the invention
In order to deepen the understanding of the present invention, below in conjunction with embodiment, the invention will be further described, and this embodiment is only used for explaining the present invention, is not intended that limiting the scope of the present invention.
As shown in Figure 1-2, present embodiments provide a kind of pavement detection equipment based on viscoelasticity resilience, including charger 1, harvester 2 and analytical equipment 3, described harvester 2 is arranged on the right side of charger 1, connected by test beam 4 between described charger 1 and harvester 2, described analytical equipment 3 is arranged on above harvester 2, it is connected by electric wire between described analytical equipment 3 and harvester 2, described test beam 4 terminal is provided with fulcrum 5, described test beam 4 left end is provided with measuring point induction apparatus 6, after described harvester 2 obtains dynamic rebound deflection time course data, analytical equipment 3 carrys out the integrated carrying ability of evaluation structure by data bases such as viscoelastic parameters or Nonlinear Dynamic elastic modelling quantity.Described charger 1 is standard axle load vehicle or the various forms such as hydraulic jack or drop impact, it is necessary to the time-history curves that record loads.Described harvester 2 comprises displacement transducer, data storage and portable printer etc., can detect and store dynamic rebound deflection data in real time.When described charger 1 is standard axle load vehicle, vehicle side arranges two groups of tires, and often group tire is two, often organizes and is connected by standard axle load car rear axle 7 between described tire, and described measuring point induction apparatus 6 is often being organized between tire.The contradiction that and practical structures present situation normal for existing deflection testing result is not inconsistent, the size proposing flexure as the absolute standard evaluating pavement structure serviceability, can not judge that by the rate of change of rebound deflection the serviceability of pavement structure judges have the better suitability than by the size of flexure.By detecting and store the time course data of dynamic rebound deflection, be conducive to choosing the test data time period of energy rational evaluation road structure integrated carrying ability.The typical sample storehouse corresponding to different loading conditions and material to be detected can be set up, can promote the use of rapidly after being depicted as nomogram handbook.
Use test procedure is as follows:
Choosing a certain old asphalt concrete pavement is example, adopts backman beam and standard axle load vehicle, is detecting acquisition backman beam rebound deflection value and dynamic rebound deflection test data respectively without breakage and all kinds of typical disease position.
(1) backman beam method
(m is taken according to " highway subgrade road surface on-the-spot test code " (JTGE60-2008) recommended formula1=1.1,m2=1) can be regarded as to obtain table 1.
From the result of calculation of table 1 it is known that rebound deflection value minimum be check crack disease position, take second place be repair disease position.If thinking that deflection value is more little by specification to show that the integrated carrying ability of pavement structure is more strong, it is clear that there is obvious contradiction with truth, illustrate that the size of flexure can not as the absolute standard evaluating pavement structure serviceability.
The modulus of resilience inverse value of table 1 backman beam
| Test point | Lossless point 1 | Lossless point 2 | Transverse joint | Repair | Pit-hole | Check crack |
| Deflection value (0.01mm) | 84 | 37 | 40.8 | 35 | 48 | 34 |
| Normal value (MPa) | 195.3 | 443.3 | 402.0 | 468.6 | 341.7 | 482.4 |
(2) method of the present invention
Detecting and storing acquisition dynamic rebound deflection test data without breakage and all kinds of typical disease position respectively, as shown in Figure 3.
For the purpose of simplifying the description, select simplest single linear damping coefficient to substitute the modulus of resilience herein, namely set up a standard axle load and load and the typical sample storehouse corresponding to linear damping parameter.The comparison of this Sample Storehouse (what adopt is Theory Solution herein) and measured data see Fig. 4,5, thus obtained material parameter is in Table 2.
The parameter list of each test point of table 2
Note: the resilience time take its actually detected in the near quasi-stationary time.
From table 2 it can be seen that the numerical value of linear damping coefficient can distinguish whether bituminous paving exists disease well, it is possible to solve to press the contradiction existed in the table 1 that method for normalizing obtains.
Claims (5)
- null1. the pavement detection equipment based on viscoelasticity resilience，It is characterized in that: include charger (1)、Harvester (2) and analytical equipment (3)，Described harvester (2) is arranged on charger (1) right side，By testing beam (4) connection between described charger (1) and harvester (2)，Described analytical equipment (3) is arranged on harvester (2) top，It is connected by electric wire between described analytical equipment (3) with harvester (2)，Described test beam (4) terminal is provided with fulcrum (5)，Described test beam (4) left end is provided with measuring point induction apparatus (6)，After described harvester (2) obtains dynamic rebound deflection time course data，Analytical equipment (3) carrys out the integrated carrying ability of evaluation structure by data bases such as viscoelastic parameters or Nonlinear Dynamic elastic modelling quantity.
- 2. the pavement detection equipment based on viscoelasticity resilience as claimed in claim 1, it is characterised in that: described charger (1) is standard axle load vehicle or the various forms such as hydraulic jack or drop impact, it is necessary to the time-history curves that record loads.
- 3. the pavement detection equipment based on viscoelasticity resilience as claimed in claim 1, it is characterised in that: described harvester (2) comprises displacement transducer, data storage and portable printer etc., can detect and store dynamic rebound deflection data in real time.
- 4. the pavement detection equipment based on viscoelasticity resilience as claimed in claim 2, it is characterized in that: when described charger (1) is for standard axle load vehicle, vehicle side arranges two groups of tires, often group tire is two, often organizing and connected by standard axle load car rear axle (7) between described tire, described measuring point induction apparatus (6) is often being organized between tire.
- 5. the pavement detection equipment based on viscoelasticity resilience as claimed in claim 1, it is characterised in that: described fulcrum (5) is adjustable to the optional position of test beam (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201610114712.5A CN105806695A (en) | 2016-03-01 | 2016-03-01 | Viscoelasticity springback deformation based pavement detection equipment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610114712.5A CN105806695A (en) | 2016-03-01 | 2016-03-01 | Viscoelasticity springback deformation based pavement detection equipment |
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| CN105806695A true CN105806695A (en) | 2016-07-27 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114753219A (en) * | 2022-04-08 | 2022-07-15 | 广州市市政工程设计研究总院有限公司 | Road springback and deflection detection device based on Beckman beam method and use method |
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| US4571695A (en) * | 1982-07-09 | 1986-02-18 | Purdue Research Foundation | Non-contact road profilometer and deflection meter |
| US20050183512A1 (en) * | 2004-02-19 | 2005-08-25 | Corcoran Paul T. | Compaction quality assurance based upon quantifying compactor interaction with base material |
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2016
- 2016-03-01 CN CN201610114712.5A patent/CN105806695A/en active Pending
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| US20050183512A1 (en) * | 2004-02-19 | 2005-08-25 | Corcoran Paul T. | Compaction quality assurance based upon quantifying compactor interaction with base material |
| CN2748497Y (en) * | 2004-07-19 | 2005-12-28 | 云南省公路科学技术研究所 | Device for detecting rebound deflection value of pavement |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114753219A (en) * | 2022-04-08 | 2022-07-15 | 广州市市政工程设计研究总院有限公司 | Road springback and deflection detection device based on Beckman beam method and use method |
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Application publication date: 20160727 |