CN102677568A - Method for reasonably controlling thickness of stress absorbing layer of pavement in area - Google Patents
Method for reasonably controlling thickness of stress absorbing layer of pavement in area Download PDFInfo
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- CN102677568A CN102677568A CN2012101305031A CN201210130503A CN102677568A CN 102677568 A CN102677568 A CN 102677568A CN 2012101305031 A CN2012101305031 A CN 2012101305031A CN 201210130503 A CN201210130503 A CN 201210130503A CN 102677568 A CN102677568 A CN 102677568A
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Abstract
The invention relates to a method for reasonably controlling thickness of a stress absorbing layer of a pavement in an area and solves the technical problems of high damage rate or cost waste caused by unreasonable designs of stress absorbing layers in prior art. The technical scheme includes that the method is characterized in that the method is achieved on the basis that a comparison formula of a stress absorbing capacity P and stress absorbing layer thickness D of the stress absorbing layer of the regional pavement is established. The method for reasonably controlling the thickness of the stress absorbing layer of the pavement in the area has the advantages that the problem that the design of the thickness of stress absorbing layers of highway pavements has no accurate basis for a long time is solved, the method is capable of accurately measuring the proportion of different asphalt mixtures and the ratio of the cracking width of stress absorbing layer bottoms at any negative temperature to upward extending height, the thickness of the stress absorbing layer can be scientifically designed, so that engineering safety can be guaranteed, material waste is prevented, and the investment is saved.
Description
Technical field
The present invention relates to a kind of highway pavement material experiment test, belong to the industry of building the road, the method for road surface stress absorbing layer design thickness in particularly a kind of reasonable control area.
Background technology
The current highway road surface, the crack can appear in the road surface under the subzero temperature condition, is to cause the bad one of the main reasons of damage by water.The crack that the road surface produces under the subzero temperature is in the majority with sub-surface cracking reflection crack again, solves an effective way in road reflection crack, is that stress absorbing layer is set under top course, sponge under the subzero temperature reflection crack from basic unit, thereby it is bad to reduce damage by water.And that stress absorbing layer need design is how thick, is that the different road material is also obstructed with the stress absorption layer thickness of subzero temperature condition needs by the material decision of subzero temperature condition and stress absorbing layer.If stress absorbing layer is too thick; The effect that solves the roadbed reflection crack is no doubt good, but cost is too high, if the stress absorbing layer laying is too thin; Do not reach the effect that absorbs stress again; Therefore, the materials amount of reasonable proof stress absorbed layer under different road environments makes the design of stress absorbing layer reach the technical problem that most economical safest degree becomes the industry urgent need solution of building the road now.
Summary of the invention
The present invention is the unreasonable spoilage height that causes of design of stress absorbing layer in the solution prior art or the technical problem of cost waste; Designed the method for road surface stress absorbing layer design thickness in a kind of reasonable control area; Can be implemented in the materials amount of reasonable proof stress absorbed layer under the different road environments through this method, make the design of stress absorbing layer reach most economical safest degree.
The present invention for realizing the technical scheme that the foregoing invention purpose adopts is; The method of road surface stress absorbing layer design thickness in a kind of reasonable control area; Its key is: described method is on the basis of stress absorption ability P that sets up regional road surface stress absorbing layer and stress absorption layer thickness D contrast formula, to realize that the concrete steps of said method comprise:
A1, making have the annular pitch stress absorption piece of central through hole;
A2, confirm to overlay the annual lowest temperature in the zone of establishing stress absorbing layer; Adjust the refrigerator-freezer cryogenic temperature to this minimum temperature according to designing requirement; And with the annular pitch stress absorption piece in the steps A 1 insert carry out in the refrigerator-freezer freezing, until annular pitch stress absorption piece by the lining to the table freeze fully;
A3, in the central through hole of the annular pitch stress absorption piece that freezes fully, insert and the supporting support in the central through hole aperture appearance that expands; Exert pressure to radially supportting the appearance that expands by designing requirement; Radially the bloated appearance of support cracks annular pitch stress absorption piece, forms the crack of extending along the interior radial outer diameter of annular pitch stress absorption piece;
A4, measure and write down the width D in crack on the internal diameter of this annular pitch stress absorption piece and the height H that the crack is extended by interior radial outer diameter respectively; And set up the stress absorption ability P of stress absorbing layer and the formula of D and H; Be P=D/ H, obtain the stress absorption ability P of this annular pitch stress absorption piece in changing the zone;
B, gather in the target area Breadth Maximum L in stress absorbing layer crack under minimum temperature; Design formulas according to the bituminous mixture stress absorption ability P in the steps A 4: the optimum design thickness that P=D/ H calculates at this regional stress absorbed layer is H=L/P, accomplishes the design of bituminous mixture stress absorbing layer optimum thickness in this zone.
Key of the present invention is before the stress absorbing layer construction, to confirm the optimum design thickness of this construction area internal stress absorbed layer earlier through lot of test.Rationally the method for control area internal stress absorber thickness is, makes transsexual stress absorption piece, belt stress is absorbed piece insert refrigerator-freezer and carry out freezing; Freezing temperature is the annual lowest temperature in this zone; Complete when freezing when the stress absorption piece, adopt corollary equipment that the stress absorption piece is cracked, measure the height H that extend along interior radial outer diameter in its internal diameter crack width D and crack; According to formula P=D/H, confirm in this zone, the stress absorption ability P of stress absorbing layer under this temperature.Gather the crack width of target area internal stress absorbed layer,, draw the best construction thickness of target area internal stress absorbed layer through supporting formula P=D/H.
The invention has the beneficial effects as follows: solved the problem that highway pavement stress absorbing layer design thickness does not have accurate foundation for a long time.The present invention can accurately measure different pitches mix material proportioning and any stress absorption end cracking width and extend upward the ratio of height layer by layer under the subzero temperature.Ability scientific design stress absorption layer thickness, thus engineering safety can be guaranteed, prevent waste of material again, reduce investment outlay.
Below in conjunction with accompanying drawing the present invention is elaborated.
Description of drawings
Fig. 1 is the structural representation that radially supports the appearance that expands among the present invention.
Fig. 2 is the structural representation that radially supports the head that expands among Fig. 1.
Among the figure, 1 represents curved plate, and 2 represent hydraulic cylinder, and 3 represent hydraulic stem, and 4 represent the flat-top screw, and 5 represent hydraulic pump, and 6 represent tube connector.
The specific embodiment
Referring to Fig. 1; The method of road surface stress absorbing layer design thickness in a kind of reasonable control area; Its key is: described method is on the basis of stress absorption ability P that sets up regional road surface stress absorbing layer and stress absorption layer thickness D contrast formula, to realize that the concrete steps of said method comprise:
A1, making have the annular pitch stress absorption piece of central through hole;
A2, confirm to overlay the annual lowest temperature in the zone of establishing stress absorbing layer; Adjust the refrigerator-freezer cryogenic temperature to this minimum temperature according to designing requirement; And with the annular pitch stress absorption piece in the steps A 1 insert carry out in the refrigerator-freezer freezing, until annular pitch stress absorption piece by the lining to the table freeze fully;
A3, in the central through hole of the annular pitch stress absorption piece that freezes fully, insert and the supporting support in the central through hole aperture appearance that expands; Exert pressure to radially supportting the appearance that expands by designing requirement; Radially the bloated appearance of support cracks annular pitch stress absorption piece, forms the crack of extending along the interior radial outer diameter of annular pitch stress absorption piece;
A4, measure and write down the width D in crack on the internal diameter of this annular pitch stress absorption piece and the height H that the crack is extended by interior radial outer diameter respectively; And set up the stress absorption ability P of stress absorbing layer and the formula of D and H; Be P=D/ H, obtain the stress absorption ability P of this annular pitch stress absorption piece in changing the zone;
B, gather in the target area Breadth Maximum L in stress absorbing layer crack under minimum temperature; Design formulas according to the bituminous mixture stress absorption ability P in the steps A 4: the optimum design thickness that P=D/ H calculates at this regional stress absorbed layer is H=L/P, accomplishes the design of bituminous mixture stress absorbing layer optimum thickness in this zone.
Radially support in the above-mentioned steps A 3 is expanded and to be comprised the cylindricality hollow section is made up of at least two curved plates 1 in the structure of appearance, be arranged on radially support in the hollow section mechanism of expanding, and curved plate 1 is located by connecting and forms the bloated head of radially support with the expand clutch end of mechanism of support radially respectively.
Above-mentioned radially support is expanded and is comprised hydraulic pump 5 in the structure of mechanism, is arranged on the hydraulic cylinder 2 in the cylindricality hollow section of being made up of curved plate 1 and radially evenly distributes and be arranged on one group of interior hydraulic stem 3 of hydraulic cylinder 2 along the cylindricality hollow section; The clutch end of hydraulic stem 3 is located by connecting by supporting coupling assembling and curved plate 1 respectively, and the output of hydraulic pump 5 is connected with hydraulic cylinder 2 by tube connector 6.
Offer deep gouge on the above-mentioned curved plate 1, described coupling assembling is flat-top screw 4 or sunk screw.
Above-mentioned hollow section is made up of 2 ~ 6 curved plates 1.
Key of the present invention is before the stress absorbing layer construction, to confirm the optimum design thickness of this construction area internal stress absorbed layer earlier through lot of test.Rationally the method for control area internal stress absorber thickness is, makes transsexual stress absorption piece, belt stress is absorbed piece insert refrigerator-freezer and carry out freezing; Freezing temperature is the annual lowest temperature in this zone; Complete when freezing when the stress absorption piece, adopt corollary equipment that the stress absorption piece is cracked, measure the height H that extend along interior radial outer diameter in its internal diameter crack width D and crack; According to formula P=D/H, confirm in this zone, the stress absorption ability P of stress absorbing layer under this temperature.Gather the crack width of target area internal stress absorbed layer,, draw the best construction thickness of target area internal stress absorbed layer through supporting formula P=D/H.
Radially support among the present invention is expanded mechanism when concrete the use, buying hydraulic hand-pump or electric hydraulic pump 5, and tube connector 4 is a flexible pipe, hydraulic cylinder 2 has bidirectional hydraulic bar or the relative hydraulic stem of four direction.Utilize wall thickness 5mm-8mm pipe to be cut into 2 lobes or 4 lobes, scrape sliding or wash the smooth curved plate 1 of processing, auger shell hole on curved plate 1 is fastened on curved plate 1 respectively on the hydraulic stem 3 on the hydraulic cylinder with screw, the support that promptly becoming to expand can the contract head that expands.The annular bituminous mixture stress absorption test block that completes is put into test freeze cabinet,, hydraulic hose is penetrated refrigerator-freezer in the perforate of refrigerator-freezer wall; Hydraulic pump is outside refrigerator-freezer, and support is expanded head in cabinet, the bloated head of support is put into the endoporus of ring specimen; The internal diameter of endoporus and support are expanded, and the minimum outer diameter of cylindricality hollow section equates that cabinet temperature to project location minimum temperature is frozen in adjustment in the head, when in definite refrigerator-freezer during the deep colling of annular bituminous mixture stress absorption test block; Can exert pressure to the bloated head of support; The bloated head of support struts annular bituminous mixture stress absorption test block, and the internal diameter of annular bituminous mixture stress absorption test block is strutted, the crack, and extends the crack to the external diameter direction.Take out test block; Length h with vernier caliper measurement annular bituminous mixture stress absorption test block endoporus crack width d and crack are extended by interior radial outer diameter then can confirm the length h that the stress absorption ability P=endoporus crack width d/ crack of this bituminous mixture under the subzero temperature condition of regulation extended by interior radial outer diameter.When learning through investigation; The sub-layer of certain material; When the maximum crack width under minimum temperature is L; Known the stress absorption ability of used bituminous mixture, then the stress absorption layer thickness of design is H=L/P, and promptly H is the stress absorption layer thickness that on the sub-layer of certain material, need design the bituminous mixture of this kind material grating of laying.
Claims (5)
1. the method for road surface stress absorbing layer design thickness in the reasonable control area; It is characterized in that: described method is on the basis of stress absorption ability P that sets up regional road surface stress absorbing layer and stress absorption layer thickness D contrast formula, to realize that the concrete steps of said method comprise:
A1, making have the annular pitch stress absorption piece of central through hole;
A2, confirm to overlay the annual lowest temperature in the zone of establishing stress absorbing layer; Adjust the refrigerator-freezer cryogenic temperature to this minimum temperature according to designing requirement; And with the annular pitch stress absorption piece in the steps A 1 insert carry out in the refrigerator-freezer freezing, until annular pitch stress absorption piece by the lining to the table freeze fully;
A3, in the central through hole of the annular pitch stress absorption piece that freezes fully, insert and the supporting support in the central through hole aperture appearance that expands; Exert pressure to radially supportting the appearance that expands by designing requirement; Radially the bloated appearance of support cracks annular pitch stress absorption piece, forms the crack of extending along the interior radial outer diameter of annular pitch stress absorption piece;
A4, measure and write down the width D in crack on the internal diameter of this annular pitch stress absorption piece and the height H that the crack is extended by interior radial outer diameter respectively; And set up the stress absorption ability P of stress absorbing layer and the formula of D and H; Be P=D/ H, obtain the stress absorption ability P of this annular pitch stress absorption piece in changing the zone;
B, gather in the target area Breadth Maximum L in stress absorbing layer crack under minimum temperature; Design formulas according to the bituminous mixture stress absorption ability P in the steps A 4: the optimum design thickness that P=D/ H calculates at this regional stress absorbed layer is H=L/P, accomplishes the design of bituminous mixture stress absorbing layer optimum thickness in this zone.
2. the method for road surface stress absorbing layer design thickness in a kind of reasonable control area according to claim 1; It is characterized in that: the radially support in the described steps A 3 is expanded and to be comprised the cylindricality hollow section is made up of at least two curved plates (1) in the structure of appearance, be arranged on radially support in the hollow section mechanism of expanding, and curved plate (1) is located by connecting and forms the bloated head of radially support with the expand clutch end of mechanism of support radially respectively.
3. the method for road surface stress absorbing layer design thickness in a kind of reasonable control area according to claim 2; It is characterized in that: described radially support is expanded and to be comprised hydraulic pump (5) in the structure of mechanism, be arranged on the hydraulic cylinder (2) in the cylindricality hollow section of being made up of curved plate (1) and radially evenly distribute and be arranged on the interior one group of hydraulic stem (3) of hydraulic cylinder (2) along the cylindricality hollow section; The clutch end of hydraulic stem (3) is located by connecting by supporting coupling assembling and curved plate (1) respectively, and the output of hydraulic pump (5) is connected with hydraulic cylinder (2) by tube connector (6).
4. the method for road surface stress absorbing layer design thickness in a kind of reasonable control area according to claim 3, it is characterized in that: described curved plate offers deep gouge on (1), and described coupling assembling is flat-top screw (4) or sunk screw.
5. the method for road surface stress absorbing layer design thickness in a kind of reasonable control area according to claim 1, it is characterized in that: described hollow section is made up of 2 ~ 6 curved plates (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210130503.1A CN102677568B (en) | 2012-04-28 | 2012-04-28 | Method for reasonably controlling thickness of stress absorbing layer of pavement in area |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210130503.1A CN102677568B (en) | 2012-04-28 | 2012-04-28 | Method for reasonably controlling thickness of stress absorbing layer of pavement in area |
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| CN102677568A true CN102677568A (en) | 2012-09-19 |
| CN102677568B CN102677568B (en) | 2014-05-21 |
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| CN201210130503.1A Active CN102677568B (en) | 2012-04-28 | 2012-04-28 | Method for reasonably controlling thickness of stress absorbing layer of pavement in area |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201433346Y (en) * | 2009-06-29 | 2010-03-31 | 邢台路桥建设总公司 | Stress absorption band |
| CN102173696A (en) * | 2011-02-15 | 2011-09-07 | 山东大学 | Pavement permeable stress absorption layer and preparation process thereof |
| CN102352593A (en) * | 2011-08-17 | 2012-02-15 | 华南理工大学 | Fiber-reinforced rubber asphalt stress absorbing layer and construction method thereof |
| CN202152436U (en) * | 2011-07-08 | 2012-02-29 | 四川新筑路业发展有限公司 | Waterproof and stress reflection-prevention pitch road |
-
2012
- 2012-04-28 CN CN201210130503.1A patent/CN102677568B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201433346Y (en) * | 2009-06-29 | 2010-03-31 | 邢台路桥建设总公司 | Stress absorption band |
| CN102173696A (en) * | 2011-02-15 | 2011-09-07 | 山东大学 | Pavement permeable stress absorption layer and preparation process thereof |
| CN202152436U (en) * | 2011-07-08 | 2012-02-29 | 四川新筑路业发展有限公司 | Waterproof and stress reflection-prevention pitch road |
| CN102352593A (en) * | 2011-08-17 | 2012-02-15 | 华南理工大学 | Fiber-reinforced rubber asphalt stress absorbing layer and construction method thereof |
Non-Patent Citations (2)
| Title |
|---|
| 李祖仲等: "Sampave应力吸收层厚度确定的数值模拟", 《河北工业大学学报》, vol. 37, no. 2, 30 April 2008 (2008-04-30) * |
| 郭文翔: "应力吸收层的设置和施工探析", 《交通标准化》, no. 10, 31 October 2011 (2011-10-31) * |
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Address after: 054001 Xingtai road and Bridge Construction Corporation, No. 79, Gaozhuang Bridge Road, Qiaodong District, Xingtai City, Hebei Province Patentee after: Xingtai road and Bridge Construction Group Co.,Ltd. Address before: 054001 Xingtai road and Bridge Construction Corporation, No. 79, Gaozhuang Bridge Road, Qiaodong District, Xingtai City, Hebei Province Patentee before: XINGTAI ROAD & BRIDGE CONSTRUCTION GENERAL Co.,Ltd. |
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