CN115406784B - Cement stabilized macadam pavement fracturing fatigue test platform - Google Patents
Cement stabilized macadam pavement fracturing fatigue test platform Download PDFInfo
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- CN115406784B CN115406784B CN202211341517.8A CN202211341517A CN115406784B CN 115406784 B CN115406784 B CN 115406784B CN 202211341517 A CN202211341517 A CN 202211341517A CN 115406784 B CN115406784 B CN 115406784B
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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
- G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
- G01N3/34—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces generated by mechanical means, e.g. hammer blows
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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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Abstract
The invention discloses a cement stabilized macadam pavement fracturing fatigue test platform which comprises a platform bottom plate, wherein a pavement test block is supported in the middle of the top surface of the platform bottom plate in a swinging mode, and rolling gantries which are arranged above the pavement test block in a spanning mode are connected to two sides of the top surface of the platform bottom plate in a sliding mode; the rolling gantry is internally and rotatably connected with a press roller pressed on the upper surface of the pavement test block, and rolling power units for providing elastic downward pressure and self-adaptive swing allowance for the press roller are symmetrically arranged on the rolling gantry. The test platform can simulate a winding road condition to perform inclined positioning and self-adaptive rolling test on the cement stabilized macadam pavement, so that the optimal pavement thickness and the optimal durability proportion of the components of the cement stabilized macadam pavement under the inclined road condition are obtained, and theoretical guidance is provided for pavement construction of the cement stabilized macadam pavement under the special road condition.
Description
Technical Field
The invention relates to the technical field of road detection, in particular to a cement stabilized macadam pavement fracturing fatigue test platform.
Background
Cement stabilized macadam is widely used in high-grade road construction due to its advantages of good durability and stability, and it is well known that cement is compressive but not tensile, so that after the cement stabilized macadam is laid on the road surface, its surface is stressed and has a tensile force, and its edge is easily broken or its local cracking is easily caused, especially under the condition of sharp-turn bend, such as inclined road condition of winding mountain road, etc., its crack is easily produced, and the whole strength and durability of the road surface are reduced.
In the prior art, the crack resistance of cement stabilized macadam under inclined road conditions is lack of systematic research, and relevant test equipment and data support are lacked, so that the problem that the outer ring of a turn is too thick is often caused in the conventional inclined pavement laying. However, the condition of mountain roads is complex, the service life of the road surface is affected by roadbed hollowing, temperature and humidity changes and the like caused by rain wash, and the problem that the cement stabilized macadam road surface is cracked or even broken from corners to the center can not be solved by increasing the pavement paving thickness.
Therefore, how to design a test device to simulate inclined road conditions such as a mountain road surface and perform a rolling test on a cement stabilized macadam road surface becomes a technical problem to be solved urgently by the person in the field.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a cement stabilized macadam pavement fracturing fatigue test platform which can simulate a winding road condition to perform inclined positioning and self-adaptive rolling test on the cement stabilized macadam pavement, so that the optimal pavement thickness of the cement stabilized macadam pavement and the optimal durability proportion of components of the cement stabilized macadam pavement under the inclined road condition are obtained, and theoretical guidance is provided for pavement construction of the cement stabilized macadam pavement under special road conditions.
A cement stabilized macadam pavement fracturing fatigue test platform comprises a platform bottom plate, wherein a pavement test block is supported in the middle of the top surface of the platform bottom plate in a swinging mode, and rolling gantries which are arranged above the pavement test block in a spanning mode are connected to two sides of the top surface of the platform bottom plate in a sliding mode; the interior of the rolling gantry is rotatably connected with a compression roller which is pressed on the upper surface of the pavement test block, and rolling power units which provide elastic downward pressure and self-adaptive swing allowance for the compression roller are symmetrically arranged on the rolling gantry.
Preferably, the rolling power unit comprises a hydraulic cylinder, a pressing plate, a top pressure spring, a self-adaptive shaft seat and a plurality of guide rods, wherein the hydraulic cylinder is vertically fixed on a cross beam at the top of the rolling gantry, and the output end of the hydraulic cylinder slides downwards to penetrate through the cross beam and is fixedly connected with the pressing plate; the bottom elastic top support of the pressure plate is connected with a top pressure spring, and the bottom end of the top pressure spring is elastically supported on the top surface of the self-adaptive shaft seat; the guide rod penetrates through the pressing plate and the self-adaptive shaft seat in a sliding mode and provides lifting sliding guide for the pressing plate and the self-adaptive shaft seat.
Preferably, the self-adaptive shaft seat comprises a rotary seat, a pin shaft and a sliding seat, wherein the top surface of the rotary seat is elastically supported and connected with a jacking spring, one side surface of the rotary seat, facing the compression roller, is circumferentially and rotatably inserted with the roller shaft of the compression roller, and the two side surfaces, facing the rolling direction of the compression roller and back to the rotary seat, of the rotary seat are respectively rotatably inserted with the sliding seat through the pin shaft; the sliding seats are vertically penetrated and slidably inserted with a plurality of guide rods.
Preferably, the top surface of the platform bottom plate is symmetrically and fixedly provided with slideways which slidably guide and support the rolling gantry; the rolling gantry comprises a gantry seat, a stand column and a cross beam, wherein the gantry seat is connected to the slide way in a sliding and guiding manner, and the stand column is vertically and fixedly arranged at the top of the gantry seat; the top of the upright post is fixedly connected with a cross beam in a matching way, and two ends of the cross beam are fixedly connected with hydraulic cylinders in a vertical direction; the bottom end of the guide rod is fixedly supported on the top surface of the gantry base, and the top end of the guide rod is fixedly supported on the bottom surface of the cross beam.
Preferably, the middle part of the platform bottom plate is provided with a vertical through abdication port, and a rotating shaft is rotatably inserted in the abdication port; one end of the rotating shaft penetrates through the outer frame of the platform bottom plate and is fixedly provided with a scale mark, and a test block tray is fixedly arranged on the middle section of the rotating shaft; the test block tray is internally inserted and fixed with the pavement test block.
Preferably, the angle ruler which is wrapped on the periphery of the rotating shaft and matched with the scale mark to identify the current swing angle of the test block tray is fixedly arranged on the side wall of the platform bottom plate.
The invention has the advantages and the technical effects that:
according to the cement stabilized macadam pavement fracturing fatigue test platform, a horizontal sliding support on an x axis is provided for a rolling gantry through a platform bottom plate, a reciprocating swinging support on a y-z axis plane is provided for a pavement test block, a rolling power unit is used for self-adaptive swinging and elastically pressing down a press roller, finally the press roller is driven to reciprocate through the reciprocating sliding of the rolling gantry, the press roller is driven to reciprocate on the pavement test block, an inclined pavement is simulated, and swinging power is provided through a rotating shaft, a test block tray and the swinging of the pavement test block to drive the press roller to self-adaptively swing.
The invention relates to a cement stabilized macadam pavement fracturing fatigue test platform, which comprises a rolling power unit, wherein each part of the rolling power unit has the functions as follows: 1. the hydraulic cylinder provides vertical downward pressure for a roll shaft of the compression roll; 2. the guide rod provides vertical lifting sliding guide for the pressure plate and the self-adaptive shaft seat; 3. the pressing plate is used for bearing the pressure of the output end of the hydraulic cylinder and the top pressure spring, and the fixed lower pressure of the hydraulic cylinder is converted into the elastic lower pressure of the top pressure spring; 4. the jacking spring can simulate a vehicle shock absorption system on one hand, namely, provides elastic downward pressure for the compression roller so as to simulate elastic jumping force generated when a vehicle tire rolls road surface gravels; on the other hand, the output forces of the two hydraulic cylinders are relatively more stable (namely, after the output forces of the two hydraulic cylinders are selected to simulate the dead weight of the vehicle in the test process, the hydraulic cylinders maintain constant force output, and the known controllable numerical value that the dead weight of the vehicle is damaged due to the change of the output forces of the hydraulic cylinders in the detection process is avoided); 5. self-adaptive shaft seat: the rotary seat is used for transmitting the downward pressure of the top supporting spring to a roller shaft of the pressing roller and provides rotary support for the sliding seat; the sliding seat is used for limiting the relative position between the guide rod and the rotary seat, particularly limiting the rotary seat on the horizontal plane, so that the self-adaptive swing of the pressing roller is realized, and the roller shafts at two ends of the pressing roller are always kept to bear the downward pressure of the hydraulic cylinder.
Drawings
FIG. 1 is a schematic perspective view of the present invention;
FIG. 2 is a side view of the present invention;
FIG. 3 is a bottom view of the present invention;
FIG. 4 isbase:Sub>A cross-sectional view of section A-A of FIG. 2;
FIG. 5 is a partial perspective view of a rolling power unit according to the present invention;
FIG. 6 is a side view of the present invention (level road ride detection attitude);
FIG. 7 is a side view of the present invention (traversary, left-leaning road detection attitude);
FIG. 8 is a side view of the present invention (traversary, road right dip detection attitude);
in the figure: 1-a platform floor; 2-a slideway; 3-pavement test block; 4-rolling power unit; 5, rolling the gantry; 6-pressing roller; 7-an angle ruler; 8-a rotating shaft; 9-test block tray; 10-a hydraulic cylinder; 11-a platen; 12-a top pressure spring; 13-a pin shaft; 14-a guide rod; 15-adaptive shaft seats; 16-a let bit port; 17-a gantry base; 18-upright post; 19-a cross beam; 20-transposition; 21-a slide.
Detailed Description
For a further understanding of the contents, features and effects of the present invention, reference will now be made to the following examples, which are to be considered in conjunction with the accompanying drawings. It should be noted that the present embodiment is illustrative, not restrictive, and the scope of the invention should not be limited thereby.
A cement stabilized macadam pavement fracturing fatigue test platform comprises a platform bottom plate 1, wherein a pavement test block 3 is supported in the middle of the top surface of the platform bottom plate in a swinging mode, and rolling gantries 5 which are arranged above the pavement test block in a spanning mode are connected to two sides of the top surface of the platform bottom plate in a sliding mode; the interior of the rolling gantry is rotatably connected with a compression roller 6 which is pressed on the upper surface of the pavement test block, and rolling power units 4 which provide elastic downward pressure and self-adaptive swing allowance for the compression roller are symmetrically arranged on the rolling gantry.
Preferably, the rolling power unit comprises a hydraulic cylinder 10, a pressing plate 11, a top pressure spring 12, a self-adaptive shaft seat 15 and a plurality of guide rods 14, wherein the hydraulic cylinder is vertically fixed on a cross beam at the top of the rolling gantry, and the output end of the hydraulic cylinder slides downwards to penetrate through the cross beam and is fixedly connected with the pressing plate; the bottom elastic top support of the pressure plate is connected with a top pressure spring, and the bottom end of the top pressure spring is elastically supported on the top surface of the self-adaptive shaft seat; the guide rod penetrates through the pressing plate and the self-adaptive shaft seat in a sliding mode and provides lifting sliding guide for the pressing plate and the self-adaptive shaft seat.
Preferably, the adaptive shaft seat comprises a rotary seat 20, a pin shaft 13 and a sliding seat 21, wherein the top surface of the rotary seat is elastically supported and connected with a jacking spring, a roller shaft of the compression roller is circumferentially and rotatably inserted and connected on one side surface of the rotary seat facing the compression roller, and the insertion and connection sliding seat is rotated and connected on two side surfaces of the rotary seat facing and back to the rolling direction of the compression roller through the pin shaft; the sliding seats are vertically penetrated and slidably inserted with a plurality of guide rods.
Preferably, the top surface of the platform bottom plate is symmetrically and fixedly provided with slideways 2 which slidably guide and support the rolling gantry; the rolling gantry comprises a gantry seat 17, an upright post 18 and a cross beam 19, wherein the gantry seat is connected on the slide way in a sliding guide way, and the upright posts are vertically and fixedly arranged at the top of the gantry seat; the top of the upright post is fixedly connected with a cross beam in a matching way, and two ends of the cross beam are fixedly connected with hydraulic cylinders in a vertical direction; the bottom end of the guide rod is fixedly supported on the top surface of the gantry base, and the top end of the guide rod is fixedly supported on the bottom surface of the cross beam.
Preferably, the middle part of the platform bottom plate is provided with a vertical through abdication port 16, and a rotating shaft 8 is rotatably inserted in the abdication port; one end of the rotating shaft penetrates through the outer frame of the platform bottom plate and is fixedly provided with a scale mark, and the middle section of the rotating shaft is fixedly provided with a test block tray 9; the test block tray is internally inserted and fixed with the pavement test block.
Preferably, an angle ruler 7 which is wrapped on the periphery of the rotating shaft and matched with the scale marks to identify the current swing angle of the test block tray is fixedly arranged on the side wall of the platform bottom plate.
In addition, the invention preferably has one end of the rotating shaft fixedly provided with the scale mark, and the rotating shaft can be connected with a motor or a hydraulic machine in the prior art to provide the reciprocating swinging rotary power of the rotating shaft on the platform bottom plate.
In addition, the test block tray is preferably fixed on the rotating shaft by adopting a mature means in the prior art, so that the test block tray swings to and fro by taking the rotating shaft as an axis.
In addition, the invention is preferable that the two ends of the compression roller are coaxially and fixedly extended with the roller shafts, the roller shafts are circumferentially and rotatably inserted into the rotary seat, a certain gap is reserved between the end part of the roller shaft and the root part of the inner hole of the rotary seat, so that a certain axial displacement allowance is reserved when the compression roller inclines, and the self-locking of the position structure of the pin shaft rotationally connected with the sliding seat is avoided.
In order to more clearly describe the specific embodiments of the present invention, an example is provided below:
according to the cement stabilized macadam pavement fracturing fatigue test platform, jacking equipment in the prior art such as a jack can be erected between the top surface of a gantry base and the bottom surface of a self-adaptive shaft base before the test is started, and a press roller is lifted; then, placing the prefabricated pavement test block in the test block tray and removing the jacking equipment to press the circumferential outer wall of the compression roller on the top surface of the pavement test block; then, a motor and other mature means in the prior art are adopted to drive the rolling gantry to slide horizontally in a reciprocating manner on the slide way, and in the process, a hydraulic cylinder is started, and the output end of the hydraulic cylinder applies downward pressure to the pressing plate and the top support spring; and finally, the pressure of the jacking spring is transmitted to a roller shaft of the compression roller through the rotary seat, so that the fracturing fatigue test of the horizontal pavement of the cement stabilized gravel road is realized.
In addition, the test block tray and the pavement test block are driven to swing back and forth by applying rotary power to the rotary shaft while keeping the downward pressure of the hydraulic cylinder and the reciprocating motion of the rolling gantry, and the scale marks on the rotary shaft and the angle ruler on the side wall of the platform bottom plate are relatively displaced in the swinging process, so that the swinging angle of the current pavement test block is read. Meanwhile, the circumferential outer wall of the compression roller is restrained by the upper surface of the pavement test block, and can swing and turn over synchronously with the pavement test block. And the compression roller is at the in-process that sways, the roller at its both ends will be at the inside small-amplitude axial slip of commentaries on classics piece, and the commentaries on classics piece will use the round pin axle to carry out the small-amplitude to sway as the axle center, change the piece at last and use round pin axle and slider as the movable support and carry out small-amplitude elevating movement on the guide arm, and then avoid the structure auto-lock problem, guarantee in slope road surface testing process, the roller of compression roller bears the holding-down force of pneumatic cylinder all the time, and the compression roller can carry out the swing motion of self-adaptation along with the swaying of road surface test block, constantly exert the reciprocal rolling force of road surface test block that is in different inclination, break until the road surface test block, from this reachs the fracturing fatigue test data on cement stabilization gravel road surface.
Finally, the invention adopts the mature products and the mature technical means in the prior art.
Although the method and manufacturing technique of the present invention have been described in terms of preferred embodiments, it will be apparent to those skilled in the art that the method and manufacturing technique of the present invention can be modified or re-combined to achieve the final manufacturing technique without departing from the scope, spirit and scope of the invention. It is expressly intended that all such similar substitutes and modifications apparent to those skilled in the art are deemed to be within the spirit, scope and content of the invention. And it will be understood that modifications and variations can be effected by a person skilled in the art in light of the above teachings and that all such modifications and variations are intended to be within the scope of the invention as defined by the appended claims.
Claims (4)
1. The utility model provides a rubble road surface fracturing fatigue test platform is stabilized to cement, includes the platform bottom plate, its characterized in that: the middle part of the top surface of the platform bottom plate is supported with a pavement test block in a swinging way, and two sides of the top surface of the platform bottom plate are connected with rolling gantries which are arranged above the pavement test block in a spanning way in a sliding way; the interior of the rolling gantry is rotatably connected with a press roller which is pressed on the upper surface of the pavement test block, and rolling power units which provide elastic downward pressure and self-adaptive swing allowance for the press roller are symmetrically arranged on the rolling gantry;
the rolling power unit comprises a hydraulic cylinder, a pressing plate, a jacking spring, a self-adaptive shaft seat and a plurality of guide rods, wherein the hydraulic cylinder is vertically fixed on a cross beam at the top of the rolling gantry, and the output end of the hydraulic cylinder slides downwards to penetrate through the cross beam and is fixedly connected with the pressing plate; the bottom elastic top support of the pressing plate is connected with a top pressure spring, and the bottom end of the top pressure spring is elastically supported on the top surface of the self-adaptive shaft seat; the guide rod penetrates through the pressure plate and the self-adaptive shaft seat in a sliding manner and provides lifting sliding guide for the pressure plate and the self-adaptive shaft seat;
the self-adaptive shaft seat comprises a rotary seat, a pin shaft and a sliding seat, wherein the top surface of the rotary seat is elastically supported and connected with a jacking spring, a roller shaft of the compression roller is circumferentially and rotatably inserted and connected on one side surface of the rotary seat facing the compression roller, and the two side surfaces of the rotary seat facing and back to the rolling direction of the compression roller are respectively rotatably inserted and connected with the sliding seat through the pin shaft; and a plurality of guide rods vertically penetrate through the sliding seat and are inserted in the sliding seat in a sliding manner.
2. The cement stabilized macadam pavement fracturing fatigue test platform of claim 1, characterized in that: the top surface of the platform bottom plate is symmetrically and fixedly provided with slideways which slidably guide and support the rolling gantry; the rolling gantry comprises a gantry seat, a stand column and a cross beam, wherein the gantry seat is connected to the slide way in a sliding and guiding manner, and the stand column is vertically and fixedly arranged at the top of the gantry seat; the top of the upright post is fixedly connected with a cross beam in a matching way, and two ends of the cross beam are fixedly connected with hydraulic cylinders in a vertical direction; the bottom end of the guide rod is fixedly supported on the top surface of the gantry base, and the top end of the guide rod is fixedly supported on the bottom surface of the cross beam.
3. The cement stabilized macadam pavement fracturing fatigue test platform of claim 1, characterized in that: the middle part of the platform bottom plate is provided with a yielding port which is vertically communicated, and a rotating shaft is rotatably inserted in the yielding port; one end of the rotating shaft penetrates through the outer frame of the platform bottom plate and is fixedly provided with a scale mark, and a test block tray is fixedly arranged on the middle section of the rotating shaft; and the pavement test blocks are fixedly inserted in the test block tray.
4. The cement stabilized macadam pavement fracturing fatigue test platform of claim 3, wherein: and an angle ruler which is wrapped on the periphery of the rotating shaft and is matched with the scale mark to identify the current swing angle of the test block tray is fixedly arranged on the side wall of the platform bottom plate.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211341517.8A CN115406784B (en) | 2022-10-31 | 2022-10-31 | Cement stabilized macadam pavement fracturing fatigue test platform |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211341517.8A CN115406784B (en) | 2022-10-31 | 2022-10-31 | Cement stabilized macadam pavement fracturing fatigue test platform |
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| CN115406784A CN115406784A (en) | 2022-11-29 |
| CN115406784B true CN115406784B (en) | 2023-01-10 |
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| CN116183401B (en) * | 2023-04-24 | 2023-08-04 | 中国建设基础设施有限公司 | Cement stabilized macadam cracking resistance detection device |
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| CN209014367U (en) * | 2018-11-06 | 2019-06-21 | 济南三勤测试技术有限公司 | A kind of electro-hydraulic servo concrete structure fatigue tester |
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| CN215414782U (en) * | 2021-07-12 | 2022-01-04 | 重庆永固新型建材有限公司 | Concrete strength detection device |
| CN216955558U (en) * | 2022-03-11 | 2022-07-12 | 长安大学 | Asphalt mixture fatigue performance testing device |
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| WO2017132414A1 (en) * | 2016-01-28 | 2017-08-03 | Coe William B | Rolling cyclic fatigue test platform for determining asphalt ductility |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN209014367U (en) * | 2018-11-06 | 2019-06-21 | 济南三勤测试技术有限公司 | A kind of electro-hydraulic servo concrete structure fatigue tester |
| CN212340884U (en) * | 2020-06-19 | 2021-01-12 | 中国电建集团成都勘测设计研究院有限公司 | Asphalt pavement reflection crack propagation simulation test device with middle layer |
| CN215414782U (en) * | 2021-07-12 | 2022-01-04 | 重庆永固新型建材有限公司 | Concrete strength detection device |
| CN113588461A (en) * | 2021-07-28 | 2021-11-02 | 周萌 | Highway road surface concrete quality detection device |
| CN216955558U (en) * | 2022-03-11 | 2022-07-12 | 长安大学 | Asphalt mixture fatigue performance testing device |
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