CN102953313A - Method for monitoring graded broken stone segregation - Google Patents
Method for monitoring graded broken stone segregation Download PDFInfo
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- CN102953313A CN102953313A CN2012104185351A CN201210418535A CN102953313A CN 102953313 A CN102953313 A CN 102953313A CN 2012104185351 A CN2012104185351 A CN 2012104185351A CN 201210418535 A CN201210418535 A CN 201210418535A CN 102953313 A CN102953313 A CN 102953313A
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Abstract
The invention relates to a method for monitoring graded broken stone segregation. The method comprises the following steps: detecting the modulus of resilience of a graded broken stone road section by using a falling weight deflectometer; and drawing a map of distribution and counting segregation the proportion and distribution. The method can effectively evaluate segregation degree of a graded broken stone mixture, intuitively reflect the level of construction, and provide an objective reference for quality control of construction, thereby ensuring overall quality of the project, prolonging the service life of the project, and reducing the life investment; therefore, the invention has great significance to improve the service level and economic benefits of freeway.
Description
Technical field:
The present invention relates to a kind of engineering analysis method, more specifically relate to a kind of graded broken stone segregation analytical method.
Background technology:
For many years, semi-rigid asphalt pavement is the primary structure form of China Higher level asphalt highway always.Yet the road surface in use progressively exposes the problems such as the crack is serious, water resistant does harm to ability, application life is short, has had a strong impact on utilization benefit and the service efficiency of speedway.
In view of the problem that semi-rigid type base exists, a large amount of research and trial had also once been carried out both at home and abroad.Major measure comprises increases thickness of bituminous surface, add the geotextile intermediate layer, add the Asphalt Stabilized Macadam intermediate layer, add several classes such as graded broken stone intermediate layer.According to China's Asphalt Pavement with Flexible Base behavior in service investigation, domestic build flexbile base is divided into two stages.First stage is carried out flexbile base (graded broken stone base or interlayer) as the measure that prevents Reflective Crack over Asphalt Pavement with Semi-rigid research.Second stage is carried out flexbile base as the major measure that prolongs the Asphalt Pavement of Highway life-span research.
Mode of occupation by China's flexbile base and graded broken stone transition zone basic unit is investigated: adopt graded broken stone base, can obviously reduce the reflection crack problem of the cracking, particularly semi-rigid asphalt pavement of flexible pavement, can obtain preferably effect.China attempts adopting the history of flexbile base also very short in Asphalt Pavement of Highway.Although built some test sections, but it is blank that large-area construction also belongs to, substantially there is not any experience, and the Long Life Asphalt Pavement of developed countries nearly all is flexbile base and complete thick formula asphalt concrete pavement, therefore a large amount of foreign technologies can be used for reference, but the greatest differences that the industrialization level of processing of region, traffic loading, environment, material, particularly material, the peopleware of construction team and management of water equality aspect exist makes us can not be with external technology.A long-life road surface depends on high-quality design, construction and the management of the maintenance of operation phase.Therefore, high-quality construction is the important step that guarantees Long Life Pavement.
Under such background, carry out the research of flexbile base (graded broken stone layer) construction quality (segregation) analytical method for the construction quality and the application life that guarantee the asphalt pavement of highway structure, so significant to the service level and the economic benefit that improve China's speedway.But Chinese scholars rarely has research to the segregation analysis of graded broken stone at present, in order to fill up this blank, the invention provides a kind of technical scheme of graded broken stone segregation analytical method.
Summary of the invention:
The monitoring method that the purpose of this invention is to provide a kind of graded broken stone segregation, the method can effectively evaluating graded broken stone mixture segregation degree, provide objective reference index to quality control on construction, and then guarantee the engineering total quality.
For achieving the above object, the present invention by the following technical solutions: said method comprising the steps of: detect the modulus of resilience in graded broken stone layer highway section with hammer-falling deflectometer, draw distribution map, statistics segregation proportion and distribution.
The monitoring method of a kind of graded broken stone segregation provided by the invention, described hammer-falling deflectometer comprises: loaded plate, guide rod, drop hammer and the data acquisition transmitting device; Described guide rod is vertically installed on the described loaded plate, is provided with the horizontal and vertical orthogonal hole at its center of perforation described dropping hammer, and described guide rod passes the longitudinal hole active link that drops hammer; Described dropping hammer is provided with stop pin and locking bolt, and the tail end of described stop pin passes the transverse holes and the guide rod that drop hammer and intersects in the center of dropping hammer, and described locking bolt is fixed on the tail end of described dead bolt; Described load sensor top arranges cushion pad; Load sensor and displacement transducer are set on the described loaded plate; The data acquisition transmitting device that is connected with main frame by interface gathers the signal of described load sensor and displacement transducer, and signal is transferred to main frame;
Described data acquisition transmitting device comprises power supply, shell, data acquisition module, cpu controller, display and interface; Described cpu controller comprises initialization module, data reception module, data processing module, data disaply moudle, data transmission module and data statistics module; After module and the port initialization, the data communication device that gathers is crossed described data reception module transfer to data processing module, data processing module is connected with data disaply moudle, data transmission module and data statistics module respectively, realizes data demonstration, transfer of data and data storage function.
The monitoring method of a kind of graded broken stone segregation provided by the invention, being distributed as of the vertical and horizontal measuring point that detects the highway section: lateral separation highway sideline 0.7-0.8m, laterally measuring point and measuring point spacing are 0.5-2m; Vertically measuring point and measuring point spacing are 5-10m, and detection length is 100-300m.
The monitoring method of another preferred a kind of graded broken stone segregation provided by the invention, the optimum value of described lateral separation highway sideline is 0.75m, laterally measuring point and measuring point spacing optimum value are 1m; Vertically measuring point and measuring point spacing optimum value are 5m, and detecting the length optimum value is 200m.
The again monitoring method of a preferred a kind of graded broken stone segregation provided by the invention, it is 4 times that described each measuring point detects number of times, rejects for the first time testing result, with the average of rear 3 testing results as measuring point modulus of resilience test result.
The monitoring method of another preferred a kind of graded broken stone segregation provided by the invention, the modulus of resilience rank in definite highway section of surveying.
The monitoring method of another preferred a kind of graded broken stone segregation provided by the invention, described load sensor and displacement transducer difference recording carrying plate are because load and the displacement that impact force occurs.
The monitoring method of another preferred a kind of graded broken stone segregation provided by the invention, described impact force is dropped hammer and is impacted loaded plate formation along the guide rod free-falling because securing rod release is dropped hammer.
The monitoring method of another preferred a kind of graded broken stone segregation provided by the invention, described dismountable guide rod is comprised of top guide bar and lower guide rod.
The monitoring method of another preferred a kind of graded broken stone segregation provided by the invention, described detection highway section be the high-quality graded broken stone as upper basic unit and semi-rigid material as substratum, roll in described detection highway section and health detected in 7 days afterwards.
With immediate prior art ratio, the beneficial effect of technical scheme provided by the invention is: select hammer-falling deflectometer that the graded broken stone leafing is analysed and estimate the stressing conditions that can embody road surface reality, this equipment operating is simple simultaneously, be easy to carry, and convenient transportation, improve test job efficient, save human and material resources, be convenient to large-scale promotion.
Advantage with the dynamic modulus analysis is: the road surface load is typical dynamic impulsion load, and dynamic modulus can embody the stressing conditions of road surface reality; Because force-bearing situation and mechanical characteristic is different, dynamic modulus can characterize the road structure working condition again.
Estimate the graded broken stone construction quality with modulus of resilience index, this index has characterized the important parameter of graded broken stone rigidity, the inhomogeneous of structural strength reacted again in the variation of the structure modulus of resilience of graded broken stone layer, thus we can utilize on-the-spot to graded broken stone base targetedly the position modulus of deploying to ensure effective monitoring and control of illegal activities a little come its segregation situation of accurate analysis.
The method can the effectively evaluating graded broken stone mixture degree of segregation, reflect intuitively construction level, provide objective reference index to quality control on construction, and then assurance engineering total quality, improve the application life of engineering, reduce the life-cycle investment, so significant to the service level and the economic benefit that improve speedway.
Description of drawings
Fig. 1 is method schematic diagram of the present invention;
Fig. 2 is that graded broken stone leafing of the present invention is analysed the structural representation of analyzing the measuring point distribution;
Fig. 3 is graded broken stone segregation degree criterion schematic diagram of the present invention;
Fig. 4 is that graded broken stone leafing of the present invention is analysed distributed data figure;
Wherein, the 1-top guide bar, the 2-loaded plate, 3-drops hammer, the 4-load sensor, the 5-cushion pad, the 6-displacement transducer, the 7-main frame, 8-graded broken stone layer, the 9-lower guide rod, 10-data acquisition transmitting device, the 11-stop pin, 12-locks bolt.
The specific embodiment
The invention will be described in further detail below in conjunction with embodiment.
Embodiment 1:
As shown in Figure 1, the invention of this example adopts hammer-falling deflectometer to roll and the graded broken stone layer of health after 7 days detects finishing, and detecting index is graded broken stone layer 8 modulus of resilience.The formula hammer-falling deflectometer of taking comprises:
Loaded plate 2, guide rod, drop hammer 3 and data acquisition transmitting device 10; Described guide rod is vertically installed on the described loaded plate 2,3 is provided with the horizontal and vertical orthogonal hole that connects its center described dropping hammer, and described guide rod passes 3 the longitudinal hole active link of dropping hammer; Described dropping hammer 3 is provided with stop pin 11 and locking bolt 12, and the tail end of described stop pin 11 passes the transverse holes and the guide rod that drop hammer and intersects in the center of dropping hammer, and described locking bolt 12 is fixed on the tail end of described dead bolt 11; Described load sensor 4 tops arrange cushion pad 5; Load sensor 4 and displacement transducer 6 are set on the described loaded plate 2; The data acquisition transmitting device 10 that is connected with main frame 7 by interface gathers the signal of described load sensors 4 and displacement transducer 6, and signal is transferred to main frame 7;
Top guide bar 1 and lower guide rod 9 are detachable, are easy to carry, and described loaded plate 2 heavy 15kg, thickness are 20mm, the described 3 heavy 10kg that drop hammer.
As shown in Figure 2, finish and the graded broken stone layer 8 in the detection highway section of health after 7 days marks measuring point rolling, measuring point is distributed as: lateral separation highway sideline 0.75m, and measuring point and measuring point spacing are 1m; Vertically measuring point and measuring point spacing are 5m, and detection length is 200m.Need before detecting detecting drawn marker line on the highway section.
The assembling hammer-falling deflectometer, top guide bar 1 is connected with lower guide rod connects, selecting diameter 30cm, heavy 15kg, thickness is the loaded plate 2 of 20mm, dropping hammer of one 10kg 3 is promoted to 85cm height along guide rod, then discharge, allow its free-falling, the 3 impact loaded plates 2 that drop hammer produce impact loads, under Impact Load, loaded plate 2 produces vertical displacement, load sensor 4 and displacement transducer 6 get off load and displacement record, and export this signal to data acquisition transmitting device 10, will signal be transferred to main frame 7 by data acquisition transmitting device 10 again.
In the measuring point position, it is 4 times that each measuring point detects number of times with equipment placement, rejects for the first time testing result, with the average of rear 3 testing results as measuring point modulus of resilience test result.
Test result is determined by modulus of resilience formula, modulus of resilience measure equation Ep=2 π pa (1-μ
2)/4l;
Wherein p is the loaded plate pressure of actual measurement, and a is the loaded plate radius, and μ is Poisson's coefficient, and l is the loaded plate center flexure of actual measurement.
As shown in Figure 3, choosing modulus of resilience value 400MPa is desired value, judges the segregation degree with the measured value of the modulus of resilience and the difference of desired value.Wherein the non-isolated modulus ranges is 380 ~ 420MPa; The surface compact modulus ranges is 360 ~ 380Mpa or 420 ~ 440MPa; Slight segregation modulus ranges is 340 ~ 360Mpa or 440 ~ 460MPa; Moderate segregation modulus ranges is 320 ~ 340Mpa or 440 ~ 460MPa; Severe segregation modulus ranges be 0 ~ 320Mpa or 480 ~+∞ MPa.
As shown in Figure 4, draw segregation spatial data distribution map, add up respectively all kinds of segregation proportions and distribution mode according to testing result and segregation distribution map, analyzing and testing section segregation state is for quality control on construction provides intuitively foundation.
Should be noted that at last: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit, although with reference to above-described embodiment the present invention is had been described in detail, those of ordinary skill in the field are to be understood that: still can make amendment or be equal to replacement the specific embodiment of the present invention, and do not break away from any modification of spirit and scope of the invention or be equal to replacement, it all should be encompassed in the middle of this claim scope.
Claims (10)
1. the monitoring method of a graded broken stone segregation said method comprising the steps of: detect the modulus of resilience in graded broken stone layer highway section with hammer-falling deflectometer, draw distribution map, statistics segregation proportion and distribution.
2. the monitoring method of a kind of graded broken stone segregation as claimed in claim 1, it is characterized in that: described hammer-falling deflectometer comprises: loaded plate, guide rod, drop hammer and the data acquisition transmitting device; Described guide rod is vertically installed on the described loaded plate, is provided with the horizontal and vertical orthogonal hole at its center of perforation described dropping hammer, and described guide rod passes the longitudinal hole active link that drops hammer; Described dropping hammer is provided with stop pin and locking bolt, and the tail end of described stop pin passes the transverse holes and the guide rod that drop hammer and intersects in the center of dropping hammer, and described locking bolt is fixed on the tail end of described dead bolt; Described load sensor top arranges cushion pad; Load sensor and displacement transducer are set on the described loaded plate; The data acquisition transmitting device that is connected with main frame by interface gathers the signal of described load sensor and displacement transducer, and signal is transferred to main frame;
Described data acquisition transmitting device comprises power supply, shell, data acquisition module, cpu controller, display and interface; Described cpu controller comprises initialization module, data reception module, data processing module, data disaply moudle, data transmission module and data statistics module; After module and the port initialization, the data communication device that gathers is crossed described data reception module transfer to data processing module, data processing module is connected with data disaply moudle, data transmission module and data statistics module respectively, realizes data demonstration, transfer of data and data storage function.
3. the monitoring method of a kind of graded broken stone segregation as claimed in claim 1 is characterized in that: being distributed as of the vertical and horizontal measuring point that detects the highway section: lateral separation highway sideline 0.7-0.8m, and laterally measuring point and measuring point spacing are 0.5-2m; Vertically measuring point and measuring point spacing are 5-10m, and detection length is 100-300m.
4. the monitoring method of a kind of graded broken stone segregation as claimed in claim 3, it is characterized in that: the optimum value of described lateral separation highway sideline is 0.75m, laterally measuring point and measuring point spacing optimum value are 1m; Vertically measuring point and measuring point spacing optimum value are 5m, and detecting the length optimum value is 200m.
5. the monitoring method of a kind of graded broken stone segregation as claimed in claim 3, it is characterized in that: it is 4 times that described each measuring point detects number of times, rejects for the first time testing result, with the average of rear 3 testing results as measuring point modulus of resilience test result.
6. the monitoring method of a kind of graded broken stone segregation as claimed in claim 1 is characterized in that: the modulus of resilience rank of determining the highway section of surveying.
7. the monitoring method of a kind of graded broken stone segregation as claimed in claim 2 is characterized in that: load and displacement that described load sensor and displacement transducer difference recording carrying plate occur owing to impact force.
8. the monitoring method of a kind of graded broken stone segregation as claimed in claim 7 is characterized in that: described impact force is because securing rod discharges drops hammer, and drops hammer to impact loaded plate along the guide rod free-falling and form.
9. the monitoring method of a kind of graded broken stone segregation as claimed in claim 2, it is characterized in that: described dismountable guide rod is comprised of top guide bar and lower guide rod.
10. the monitoring method of a kind of graded broken stone segregation as claimed in claim 3 is characterized in that: described detection highway section be the high-quality graded broken stone as upper basic unit and semi-rigid material as substratum, roll in described detection highway section and health detected in 7 days afterwards.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210418535.1A CN102953313B (en) | 2012-10-26 | 2012-10-26 | A kind of monitoring method of graded broken stone isolation |
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| CN201210418535.1A CN102953313B (en) | 2012-10-26 | 2012-10-26 | A kind of monitoring method of graded broken stone isolation |
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| CN102953313A true CN102953313A (en) | 2013-03-06 |
| CN102953313B CN102953313B (en) | 2016-10-12 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107142822A (en) * | 2017-04-28 | 2017-09-08 | 华侨大学 | A kind of empty detection means of roadbed and its detection method |
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Patent Citations (4)
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| US6497930B1 (en) * | 2001-04-11 | 2002-12-24 | Gerald D. Petermeier | Process for recycling asphalt shingles and product produced thereby |
| CN1880579A (en) * | 2005-06-13 | 2006-12-20 | 郑州大学 | Application technology of falling weight deflectometer and ground penetrating radar in pavement construction |
| CN101250848A (en) * | 2008-03-24 | 2008-08-27 | 山东省交通科学研究所 | Agitation type pavement deflection tester |
| CN202073124U (en) * | 2011-03-30 | 2011-12-14 | 江苏省交通科学研究院股份有限公司 | Handheld type drop hammer deflectometer |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107142822A (en) * | 2017-04-28 | 2017-09-08 | 华侨大学 | A kind of empty detection means of roadbed and its detection method |
| CN107142822B (en) * | 2017-04-28 | 2019-08-06 | 华侨大学 | A kind of roadbed cavity detection device and its detection method |
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| CN102953313B (en) | 2016-10-12 |
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