CN211576827U - In-situ detection device for shear strength between asphalt road layers by cylinder beveling method - Google Patents
In-situ detection device for shear strength between asphalt road layers by cylinder beveling method Download PDFInfo
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- CN211576827U CN211576827U CN202020156649.3U CN202020156649U CN211576827U CN 211576827 U CN211576827 U CN 211576827U CN 202020156649 U CN202020156649 U CN 202020156649U CN 211576827 U CN211576827 U CN 211576827U
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Abstract
An in-situ detection device for asphalt road interlayer shear strength by a cylinder beveling method comprises a metal sleeve sleeved on a shear strength sample in a surface layer round pit; an oil jack, a spherical support and a counterforce device are sequentially arranged on the metal sleeve; the oil jack is connected with the oil hydraulic pump through a pressure pipe; the bottom of the counterforce device is embedded in the surface layer, and the shear strength sample, the metal sleeve, the hydraulic jack and the spherical support seat are covered under the counterforce device; the longitudinal axes of the shear strength test sample, the metal sleeve and the oil jack are coaxial. The utility model discloses a detection device, the counter shear strength sample is applyed the load and is decomposed into vertical load and horizontal load between surface course and basic unit layer, cuts at surface course and basic unit layer shear failure until the shear strength sample, reads the maximum load to according to the area of receiving the shear, calculate shear strength, the practicality is strong, detects the accuracy.
Description
Technical Field
The utility model relates to a shear strength beveling cylinder method normal position detection device between bituminous paving layer.
Background
The slippage damage between the surface layer and the base layer is a common disease of semi-rigid asphalt roads. The asphalt road surface course and the semi-rigid base course (such as a cement stable course) need to be compacted and rolled sufficiently during paving, so that the surface of the semi-rigid base course is relatively flat and compact, the frictional resistance on the interlayer joint surface of the asphalt road surface course and the surface course is reduced more and lower than the strength of the mixture objectively, and the strength constitution is converted into the dependence on the cohesive force. If the interlayer bonding is not treated by effective materials and processes, the condition that the strength of the mixture is not less than the strength of the mixture is not met, and an interlayer bonding surface becomes a weak part for pavement structure damage.
With the development of society, road vehicles are increasing, heavy-duty and overload vehicles are frequently seen, the shear stress between a road surface layer and a base layer is large, and if the shear strength between the surface layer and the base layer is not enough to resist the shear effect, the surface layer can be slipped and damaged. Therefore, it becomes a very important task to measure the shear strength between the surface layer and the base layer in situ.
The relevant design standard indicates that the shear stress is generated by the combined action of the vertical load and the horizontal load of the wheel, and the detection method should consider the vertical load and the horizontal load simultaneously. At present, no standard method for in-situ detection of the shear strength between an asphalt concrete pavement layer and a base layer exists, and some existing research results only consider horizontal load due to the fact that vertical load cannot be effectively applied, so that the detection result is not in line with the actual situation and the persuasion is not high. Therefore, design and creation are required.
SUMMERY OF THE UTILITY MODEL
The utility model provides a shear strength beveling cylinder method normal position detection device between bituminous paving layer that the practicality is strong, detect accuracy, reasonable in design, the problem of shear strength method standard between current no present normal position detection bituminous paving surface course and the basic unit layer can be solved to this detection device.
The utility model adopts the technical proposal that: an in-situ detection device for asphalt road interlayer shear strength by a cylinder beveling method comprises a metal sleeve sleeved on a shear strength sample in a surface layer round pit; an oil jack, a spherical support and a counterforce device are sequentially arranged on the metal sleeve; the oil jack is connected with the oil hydraulic pump through a pressure pipe; the bottom of the counterforce device is embedded in the surface layer, and the shear strength sample, the metal sleeve, the hydraulic jack and the spherical support seat are covered under the counterforce device; the longitudinal axes of the shear strength test sample, the metal sleeve and the oil jack are coaxial. The utility model discloses a detection device, the counter shear strength sample is applyed the load and is decomposed into vertical load and horizontal load between surface course and basic unit layer, cuts at surface course and basic unit layer and destroys until the shear strength sample, reads the maximum load to according to the area of receiving shear, calculate shear strength.
Furthermore, the thickness of the surface layer is 100mm-200 mm.
Furthermore, the round pit is a cylinder, the diameter of the top surface of the round pit is 400mm, the round pit is flush with the surface of the surface layer, and the bottom surface of the round pit is connected with the top surface between the layers.
Furthermore, the shear strength test sample is a chamfered cylinder, the included angle between the longitudinal axis and the bottom surface is 45 degrees, and the included angle between the longitudinal axis and the top surface is 90 degrees; the bottom surface is a chamfer plane and is oval and level with the top surface between layers, the oval long axis of the bottom surface is in the same straight line with the diameter of the bottom surface of the round pit, the distance between the end point of the oval long axis of the bottom surface and the side wall of the round pit meets the operation requirement, the top surface is a perfect circle, and the highest point is level with the surface of the surface layer; the major axis of the ellipse on the bottom surface is 150mm, the minor axis of the ellipse is 106mm, and the diameter of the perfect circle on the top surface is 106 mm.
Further, the metal sleeve comprises a lower beveled circular ring body and an upper cylinder; the inner cavity of the oblique cutting ring body at the lower part can be sleeved with a shear strength sample, the top surface is parallel to the top surface of the shear strength sample, the diameter of the inner ring of the top surface is 106.1-107 mm, the bottom surface is parallel to the bottom surface of the shear strength sample and is 1-2 mm higher than the bottom surface of the shear strength sample, and the wall thickness is 10-20 mm; the right circular side line of the bottom surface of the upper cylinder is connected with the outer circular side line of the top surface of the oblique cutting circular ring body in a superposition mode, the bottom surface of the upper cylinder is connected with the top surface of the shear strength sample in a bonding mode through an epoxy adhesive, the height of the cylinder is at least 10mm, and the middle of the top surface is in contact with the bottom surface of the oil jack.
Further, the oil hydraulic pump is provided with a digital pressure gauge with a peak value storage function.
Further, the reaction device includes a metal reaction beam, a reaction screw, and a reaction nut.
Furthermore, the metal counter-force beam is a rectangular plate, the bottom surface and the top surface are perpendicular to the longitudinal axis of the shear strength sample, two ends of the metal counter-force beam are symmetrically provided with a connecting circular hole which is communicated up and down and is connected with a counter-force screw rod, and the middle part of the bottom surface is in contact with the top surface of the oil jack through a spherical support.
Furthermore, the reaction screw rods are symmetrically arranged on two sides of the shear strength sample, the longitudinal axis is parallel to the longitudinal axis of the shear strength sample and is in the same plane, the bottom of the reaction screw rods is embedded in a matched anchoring hole in the surface layer through chemical anchoring glue, the top of the reaction screw rods penetrates through the connecting circular hole and is screwed and fastened with a matched reaction nut, and the distance between the side wall of the anchoring hole and the side wall of the circular pit is at least 50 mm.
The utility model has the advantages that: (1) in the detection process, the load is applied to the shear strength resisting sample and is decomposed into a vertical load and a horizontal load between the surface layer and the base layer until the shear strength resisting sample is subjected to shear failure between the surface layer and the base layer, and the shear strength is calculated according to the shear area, so that the problems that the detection result is not in line with the actual condition and the persuasion is not high due to the fact that the vertical load cannot be effectively applied are solved, the practicability is high, and the detection is accurate; (2) the detection device is reasonable in design, and instruments and parts are purchased, processed, assembled and carried conveniently, so that the popularization value is greatly improved; (3) the method solves the problem that the existing method for detecting the shear strength between the asphalt concrete pavement layer and the base layer in situ is not standard, and provides technical support for construction acceptance, design reinforcement, quality supervision and the like.
Drawings
Fig. 1 is a schematic view of the present invention in front view.
Fig. 2 is a schematic cross-sectional view of the present invention using a-a.
Fig. 3 is a schematic cross-sectional view of the present invention using B-B.
Fig. 4 is a schematic cross-sectional view of the present invention using C-C.
Fig. 5 is a schematic cross-sectional view of the present invention using a D-D.
Fig. 6 is a schematic top view of the structure of the present invention.
Fig. 7 is a schematic cross-sectional view of structure E-E of the present invention.
Fig. 8 is a schematic cross-sectional view of the structure F-F of the present invention.
Fig. 9 is a schematic sectional view of the structure G-G of the present invention.
Fig. 10 is a schematic view of the drilling of a shear strength sample according to the present invention.
Detailed Description
The present invention will be further described with reference to the following specific embodiments, but the present invention is not limited to these specific embodiments. It will be recognized by those skilled in the art that the present invention encompasses all alternatives, modifications, and equivalents as may be included within the scope of the claims.
Referring to fig. 1-10, an in-situ detection device for the shear strength between asphalt road layers by a beveled cylinder method comprises a metal sleeve 9 sleeved on a surface layer 11 and a round pit 12 for a shear strength test sample 15; the metal sleeve 9 is sequentially provided with an oil jack 8, a spherical support 5 and a counterforce device 6; the oil jack 8 is connected with the oil hydraulic pump 2 through a pressure pipe 1; the bottom of the counterforce device 6 is embedded in the surface layer 11, and the shear strength sample 15, the metal sleeve 9, the hydraulic jack 8 and the spherical support 5 are covered under the counterforce device; the longitudinal axes of the shear strength test sample 15, the metal sleeve 9 and the oil jack 8 are coaxial. The utility model discloses a detection device, the counter shear strength sample 15 is applyed the load and 18 are decomposed into vertical load and horizontal load between surface course 11 and 14 layers of basic unit, until shear strength sample 15 18 shear failure between surface course 11 and 14 layers of basic unit, reads the maximum load to according to the area of receiving to cut, calculate shear strength.
The thickness of the surface layer 11 in this embodiment is 180 mm.
The round pit 12 is a cylinder, the diameter of the top surface of the round pit is 400mm, the round pit is flush with the surface of the surface layer 11, the bottom surface of the round pit is connected with the top surface of the interlayer 18, and the depth of the round pit is 180 mm.
The shear strength test sample 15 in this embodiment is a chamfered cylinder, and the included angle between the longitudinal axis and the bottom surface is 45 degrees, and the included angle between the longitudinal axis and the top surface is 90 degrees; the bottom surface is a chamfer plane and is oval and level with the top surface of the interlayer 18, the long axis of the oval of the bottom surface is the same straight line with the diameter of the bottom surface of the round pit 12, the distance between the end point of the long axis of the oval of the bottom surface and the side wall of the round pit 12 is 30mm, the top surface is a perfect circle, and the highest point of the top surface is level with the surface of the surface layer; the major axis of the ellipse on the bottom surface is 150mm, the minor axis of the ellipse is 106mm, and the diameter of the perfect circle on the top surface is 106 mm.
The metal sleeve 9 of the present embodiment includes a chamfered circular ring body at the lower part and a cylinder at the upper part; the inner cavity 10 of the lower oblique cutting torus can be sleeved with a shear strength sample 15, the top surface is parallel to the top surface of the shear strength sample 15, the diameter of an inner ring of the top surface is 106.5mm, the bottom surface is parallel to the bottom surface of the shear strength sample 15 and is 1.5mm higher than the bottom surface of the shear strength sample 15, and the wall thickness is 16 mm; the bottom surface of the upper cylinder is in a right circular side line coincident connection with the outer circular side line of the top surface of the oblique circular ring body, the bottom surface of the upper cylinder is in adhesive connection with the top surface of the shear strength test sample 15 through an epoxy adhesive 17, the height of the cylinder is 16mm, and the middle part of the top surface is in contact with the bottom surface of the oil jack 8.
In this embodiment, the oil hydraulic pump 2 is provided with a digital pressure gauge 3 having a peak saving function.
The reaction force device 6 according to the present embodiment includes a metal reaction beam 4, a reaction screw 7, and a reaction nut 16.
In the embodiment, the metal reaction cross beam 4 is a rectangular plate, the length × width × thickness is 560mm × 60mm × 20mm, the bottom surface and the top surface are perpendicular to the longitudinal axis of the shear strength test sample 15, two ends of the metal reaction cross beam are symmetrically provided with a connecting circular hole 19 which is vertically through and connected with the reaction screw 7, the diameter of the hole is 22mm, the distance between the hole and the hole is 500mm, and the middle part of the bottom surface is in contact with the top surface of the hydraulic jack 8 through the spherical support 5.
The reaction screw 7 of this embodiment, length 400mm, specification 18mm, the symmetry is located shear strength sample 15 both sides, and its axis of ordinates is parallel and the coplanar with shear strength sample 15 axis of ordinates, and its bottom is buried in supporting anchor hole 19 in surface course 11 through chemical anchor glue 21 underground, and anchor hole 19 aperture 24mm, degree of depth 130mm, its top pass connect round hole 20 with supporting reaction nut 16 fasten the fastening, and anchor hole 19 lateral wall and round pit 12 lateral wall distance are greater than 50 mm.
The detection steps of this embodiment are as follows: (1) cutting the road surface by a road surface cutting machine, and adjusting the cutting angle to ensure that the angle between the cutting surface and the surface layer is 135 degrees and the depth along the cutting surface is 120 mm; (2) fixing an angle-adjustable core-drilling machine 22 on the surface of the surface layer 11, installing a small-diamond thin-wall hollow drill bit 23 with the inner diameter of 106mm and the length of 420mm, and adjusting the angle and the distance of the angle-adjustable core-drilling machine 22 to enable the small-diamond thin-wall hollow drill bit 23 to form an included angle of 90 degrees with a cutting surface; (3) starting the angle-adjustable core drilling machine 22, drilling a small-diamond thin-wall hollow drill bit 23, wherein the minimum drilling depth is the bottom surface of the interlayer 18, and forming a shear strength sample 15; (4) stopping the angle-adjustable core drilling machine 22, replacing the large diamond thin-wall hollow drill bit 24 with the outer diameter of 400mm and the length of 420mm, and adjusting the angle and the distance of the angle-adjustable core drilling machine 22 to ensure that the large diamond thin-wall hollow drill bit 24 is vertical to the surface of the surface layer 11, and the longitudinal axis of the large diamond thin-wall hollow drill bit 24 is in the same plane with the elliptical long axis of the bottom surface of the shear strength sample 15; (5) starting the core drilling machine 22 with the adjustable angle, drilling the large diamond thin-wall hollow drill bit 24, wherein the minimum drilling depth is the maximum drilling depth of the small diamond thin-wall hollow drill bit 23 to form the side wall of the round pit 12, and the distance between the end point of the elliptic major axis of the bottom surface and the side wall of the round pit 12 is 30 mm; (6) removing the core drilling machine 22 with the adjustable angle, and chiseling the surface layer 11 and the base layer 14 roads between 2 drilling holes; (7) pouring a chiseling part by using a self-compacting non-shrinkage grouting material 13, wherein the top surface of the self-compacting non-shrinkage grouting material 13 is in the same plane with the top surface of the interlayer 18 to form a round pit 12; (8) drilling a hole in the surface layer 11 by using an electric hammer, wherein the drilling angle is parallel to the longitudinal axis of the shear strength sample 15, the drilling point is 250mm away from the longitudinal axis of the shear strength sample 15, symmetrically drilling anchoring holes 19 at two sides of the shear strength sample 15, the hole diameter is 24mm, the depth is 130mm, the longitudinal axis of the anchoring holes 19 and the longitudinal axis of the shear strength sample 15 are in the same plane, anchoring glue 21 is poured into the anchoring holes 19, and a counter-force screw 7 is inserted in a rotating way; (9) coating an epoxy adhesive 17 on the top surface of a shear strength sample 15, sleeving a metal sleeve 9 into the shear strength sample 15, slightly pressing a cylinder on the upper part of the metal sleeve 9 by hand to bond the shear strength sample 15 and the metal sleeve 9, placing an oil jack 8 and a spherical support 5 on the metal sleeve 9 in sequence after self-compacting shrinkage-free grouting material 13, an anchor adhesive 21 and the epoxy adhesive 17 are solidified, sleeving a connecting circular hole 20 into a counter-force screw 7, enabling the middle part of the bottom surface of a metal counter-force beam 4 to be in contact with the top surface of the oil jack 8 through the spherical support 5, and screwing and fastening a counter-force nut 16; (10) the oil jack 8 is connected with the oil hydraulic pump 2 through the pressure pipe 1, the oil hydraulic pump 2 is started to load, the anti-shear strength sample 15 applies load and is decomposed into vertical load and horizontal load between the surface layer 11 and the base layer 14 layer 18 until the anti-shear strength sample 15 is sheared and damaged between the surface layer 11 and the base layer 14 layer 18, the maximum load is read, and the shear strength is calculated according to the shearing area.
Claims (9)
1. The utility model provides an asphalt road interlaminar shear strength chamfer cylinder method normal position detection device which characterized in that: comprises a metal sleeve for sleeving a shear strength sample in a surface layer round pit; an oil jack, a spherical support and a counterforce device are sequentially arranged on the metal sleeve; the oil jack is connected with the oil hydraulic pump through a pressure pipe; the bottom of the counterforce device is embedded in the surface layer, and the shear strength sample, the metal sleeve, the hydraulic jack and the spherical support seat are covered under the counterforce device; the longitudinal axes of the shear strength test sample, the metal sleeve and the oil jack are coaxial.
2. The in-situ detection device for the shear strength oblique cutting cylinder method between the asphalt road layers according to claim 1, characterized in that: the surface layer is 100mm-200mm thick.
3. The in-situ detection device for the shear strength oblique cutting cylinder method between the asphalt road layers according to claim 1, characterized in that: the round pit is a cylinder, the diameter of the top surface of the round pit is 400mm, the round pit is flush with the surface of the surface layer, and the bottom surface of the round pit is connected with the top surface between layers.
4. The in-situ detection device for the shear strength oblique cutting cylinder method between the asphalt road layers according to claim 1, characterized in that: the shear strength test sample is a chamfered cylinder, the included angle between the longitudinal axis and the bottom surface is 45 degrees, and the included angle between the longitudinal axis and the top surface is 90 degrees; the bottom surface is a chamfer plane and is oval and level with the top surface between layers, the oval long axis of the bottom surface is in the same straight line with the diameter of the bottom surface of the round pit, the distance between the end point of the oval long axis of the bottom surface and the side wall of the round pit meets the operation requirement, the top surface is a perfect circle, and the highest point is level with the surface of the surface layer; the major axis of the ellipse on the bottom surface is 150mm, the minor axis of the ellipse is 106mm, and the diameter of the perfect circle on the top surface is 106 mm.
5. The in-situ detection device for the shear strength oblique cutting cylinder method between the asphalt road layers according to claim 1, characterized in that: the metal sleeve comprises a lower oblique ring body and an upper cylinder; the inner cavity of the oblique cutting ring body at the lower part can be sleeved with a shear strength sample, the top surface is parallel to the top surface of the shear strength sample, the diameter of the inner ring of the top surface is 106.1-107 mm, the bottom surface is parallel to the bottom surface of the shear strength sample and is 1-2 mm higher than the bottom surface of the shear strength sample, and the wall thickness is 10-20 mm; the right circular side line of the bottom surface of the upper cylinder is connected with the outer circular side line of the top surface of the oblique cutting circular ring body in a superposition mode, the bottom surface of the upper cylinder is connected with the top surface of the shear strength sample in a bonding mode through an epoxy adhesive, the height of the cylinder is at least 10mm, and the middle of the top surface is in contact with the bottom surface of the oil jack.
6. The in-situ detection device for the shear strength oblique cutting cylinder method between the asphalt road layers according to claim 1, characterized in that: the oil hydraulic pump is provided with a digital pressure gauge with a peak value storage function.
7. The in-situ detection device for the shear strength oblique cutting cylinder method between the asphalt road layers according to claim 1, characterized in that: the reaction device comprises a metal reaction beam, a reaction screw and a reaction nut.
8. The in-situ detection device for the shear strength oblique cutting cylinder method between the asphalt road layers according to claim 7, characterized in that: the metal counter-force beam is a rectangular plate, the bottom surface and the top surface are perpendicular to the longitudinal axis of the shear strength sample, two connecting circular holes which are vertically communicated and connected with counter-force screws are symmetrically drilled at two ends of the metal counter-force beam, and the middle part of the bottom surface is in contact with the top surface of the oil jack through a spherical support.
9. The in-situ detection device for the shear strength oblique cutting cylinder method between the asphalt road layers according to claim 7, characterized in that: the reaction screw rods are symmetrically arranged on two sides of the shear strength sample, the longitudinal axis is parallel to the longitudinal axis of the shear strength sample and is in the same plane, the bottom of the reaction screw rods is embedded in a matched anchoring hole in a surface layer through chemical anchoring glue, the top of the reaction screw rods penetrates through a connecting circular hole and is screwed and fastened with a matched reaction nut, and the distance between the side wall of the anchoring hole and the side wall of the circular pit is at least 50 mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020156649.3U CN211576827U (en) | 2020-02-09 | 2020-02-09 | In-situ detection device for shear strength between asphalt road layers by cylinder beveling method |
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| CN202020156649.3U CN211576827U (en) | 2020-02-09 | 2020-02-09 | In-situ detection device for shear strength between asphalt road layers by cylinder beveling method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113176202A (en) * | 2021-03-29 | 2021-07-27 | 河北瑞志交通技术咨询有限公司 | Interlayer bonding strength test system based on oblique shear force |
| CN113984546A (en) * | 2021-09-28 | 2022-01-28 | 北京建筑大学 | Testing machine and testing method for measuring road interlayer shear strength |
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2020
- 2020-02-09 CN CN202020156649.3U patent/CN211576827U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113176202A (en) * | 2021-03-29 | 2021-07-27 | 河北瑞志交通技术咨询有限公司 | Interlayer bonding strength test system based on oblique shear force |
| CN113984546A (en) * | 2021-09-28 | 2022-01-28 | 北京建筑大学 | Testing machine and testing method for measuring road interlayer shear strength |
| CN113984546B (en) * | 2021-09-28 | 2023-08-22 | 北京建筑大学 | Testing machine and testing method for measuring road interlayer shear strength |
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