CN202562817U - Expansion instrument for measuring stress absorbability of asphalt mixture under negative pressure - Google Patents
Expansion instrument for measuring stress absorbability of asphalt mixture under negative pressure Download PDFInfo
- Publication number
- CN202562817U CN202562817U CN2012201893433U CN201220189343U CN202562817U CN 202562817 U CN202562817 U CN 202562817U CN 2012201893433 U CN2012201893433 U CN 2012201893433U CN 201220189343 U CN201220189343 U CN 201220189343U CN 202562817 U CN202562817 U CN 202562817U
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- support
- stress absorption
- asphalt
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Abstract
The utility model relates to an expansion instrument for measuring stress absorbability of an asphalt mixture under negative pressure. The expansion instrument solves the problems of no basis in design thickness of a stress absorption layer, realizes reasonable and scientific design thickness of the stress absorption layer, reduces wastes and ensures engineering safety. The technical scheme of the utility model is as follows: the expansion instrument structurally comprises a cylindrical hollow tube consisting of at least two pieces of arc-shaped steel plates and a radial expansion mechanism arranged in the hollow tube, and the arc-shaped steel plates are respectively connected with the power output end of the radial expansion mechanism in a positioning manner to form a radial expansion head. The expansion instrument disclosed by the utility model has the beneficial effect of solving the problem of no basis in the design thickness of the stress absorption layers of different asphalt mixtures. The expansion instrument disclosed by the utility model can be used for accurately measuring and calculating the crack widths of different sub-layers under the lowest temperature and the paved thickness of the stress absorption layers of different asphalt mixtures, thereby being capable of ensuring engineering safety, preventing material waste and saving investment.
Description
Technical field
The utility model relates to the test of a kind of highway pavement material experiment, belongs to the industry of building the road, the particularly a kind of stress absorption ability is used under the asphalt subzero temperature support appearance that expands of measuring.
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 different with the stress absorption layer thickness of subzero temperature condition needs by the material decision of the fracture width of subzero temperature condition sub-layer 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 absorption layer under different road environments makes the design of stress absorbing layer reach the technical matters that most economical safest degree becomes the industry urgent need solution of building the road now.
Summary of the invention
The utility model is not have the problem of foundation in order to solve the Thickness Design of stress absorbing layer in the prior art; Designed a kind of bloated appearance of support that the stress absorption ability is used under the asphalt subzero temperature of measuring; Can obtain the stress absorption ability of different pitches compound exactly through this instrument; Can calculate the stress absorbing layer design thickness easily, be implemented in the materials amount of reasonable proof stress absorption layer under the different road environments, make the design of stress absorbing layer reach most economical safest degree.
The utility model for realizing the technical scheme that the foregoing invention purpose adopts is; A kind of stress absorption ability is used under the asphalt subzero temperature support appearance that expands of measuring; Above-mentioned support is expanded and to be comprised the cylindricality hollow tubular is made up of at least two curved plates in the structure of appearance, be arranged on radially support in the hollow tubular mechanism of expanding, and curved plate is located by connecting and forms the bloated head of radially support with the expand clutch end of mechanism of support radially respectively.
The beneficial effect of the utility model is: solved the problem that highway pavement stress absorbing layer design thickness does not have accurate foundation for a long time.The invention of this instrument can be measured different pitches compound crack the ratio of width to height under the subzero temperature condition exactly, calculates the stress absorption ability of asphalt, thereby carries out the stress absorbing layer Thickness Design exactly; Like this; Can guarantee engineering safety, prevent waste of material again, reduce investment outlay.
Below in conjunction with accompanying drawing the utility model is elaborated.
Description of drawings
Fig. 1 is the structural representation of the utility model.
Fig. 2 is the structural representation that radially supports the head that expands in the utility model.
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 connecting pipe.
Embodiment
Referring to Fig. 1; A kind of stress absorption ability is used under the asphalt subzero temperature support appearance that expands of measuring; Its key is: above-mentioned support is expanded and to be comprised the cylindricality hollow tubular is made up of at least two curved plates 1 in the structure of appearance, be arranged on radially support in the hollow tubular 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 tubular 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 tubular; The clutch end of hydraulic stem 3 is located by connecting by supporting coupling assembling and curved plate 1 respectively, and the output terminal of hydraulic pump 5 is connected with hydraulic cylinder 2 by connecting pipe 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 tubular is made up of 2 ~ 6 curved plates 1.
The utility model is purchased hydraulic hand-pump or electric hydraulic pump 5 when concrete the use, connecting pipe 4 is a flexible pipe, and 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 asphalt 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 tubular 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 asphalt stress absorption test block; Can exert pressure to the bloated head of support; The bloated head of support struts annular asphalt stress absorption test block, and the internal diameter of annular asphalt 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 asphalt stress absorption test block endoporus fracture width d and crack are extended by interior radial outer diameter then can confirm the length h that the stress absorption ability P=endoporus fracture width d/ crack of this asphalt 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 asphalt, 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 asphalt of this kind material grating of laying.
Claims (4)
1. measure the bloated appearance of support that the stress absorption ability is used under the asphalt subzero temperature for one kind; It is characterized in that: described support is expanded and to be comprised the cylindricality hollow tubular is made up of at least two curved plates (1) in the structure of appearance, be arranged on radially support in the hollow tubular 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.
2. a kind of bloated appearance of support that the stress absorption ability is used under the asphalt subzero temperature of measuring according to claim 1; 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 tubular 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 tubular; The clutch end of hydraulic stem (3) is located by connecting by supporting coupling assembling and curved plate (1) respectively, and the output terminal of hydraulic pump (5) is connected with hydraulic cylinder (2) by connecting pipe (6).
3. a kind of bloated appearance of support that the stress absorption ability is used under the asphalt subzero temperature of measuring according to claim 2, 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.
4. a kind of bloated appearance of support that the stress absorption ability is used under the asphalt subzero temperature of measuring according to claim 1, it is characterized in that: described hollow tubular is made up of 2 ~ 6 curved plates (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201893433U CN202562817U (en) | 2012-04-28 | 2012-04-28 | Expansion instrument for measuring stress absorbability of asphalt mixture under negative pressure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201893433U CN202562817U (en) | 2012-04-28 | 2012-04-28 | Expansion instrument for measuring stress absorbability of asphalt mixture under negative pressure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202562817U true CN202562817U (en) | 2012-11-28 |
Family
ID=47212462
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012201893433U Expired - Lifetime CN202562817U (en) | 2012-04-28 | 2012-04-28 | Expansion instrument for measuring stress absorbability of asphalt mixture under negative pressure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202562817U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106018463A (en) * | 2016-05-31 | 2016-10-12 | 深圳市市政设计研究院有限公司 | Evaluation method for low temperature crack resistance of asphalt |
-
2012
- 2012-04-28 CN CN2012201893433U patent/CN202562817U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106018463A (en) * | 2016-05-31 | 2016-10-12 | 深圳市市政设计研究院有限公司 | Evaluation method for low temperature crack resistance of asphalt |
| CN106018463B (en) * | 2016-05-31 | 2017-06-30 | 深圳市市政设计研究院有限公司 | A kind of evaluation method of pitch crack resistance at low-temperature |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
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. |
|
| CP01 | Change in the name or title of a patent holder | ||
| CX01 | Expiry of patent term |
Granted publication date: 20121128 |
|
| CX01 | Expiry of patent term |