Interlaminar shear strength shearing clamp for asphalt test piece
By designing a shear strength shear fixture suitable for the straight cutting method, the vertical setting and adjustment components of the fixture main body and the cutting tool part ensure that the asphalt specimen is facing the cutting tool, solving the problem of complex multi-angle positioning in the oblique cutting method, and improving the accuracy and efficiency of the test.
Patent Information
- Application Number
- CN202421213941.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-30
- Publication Date
- 2025-09-02
- Estimated Expiration
- 2034-05-30
AI Technical Summary
In the existing interlayer shear strength tests of asphalt pavement, the oblique cutting method requires multi-angle positioning, resulting in complex operations and inaccurate data, making it difficult to adapt to the requirements of the direct cutting method.
A shear strength shear fixture between asphalt specimens is designed, using a fixture main body and a cutter piece. The fixture main body has an installation through hole and a cutter jack. The cutter piece is arranged perpendicularly with the asphalt specimen. Combined with the adjustment component, it ensures that the specimen is facing the cutter piece, and a gantry structure is adopted to withstand pressure loads.
The accuracy of the shear strength data between asphalt pavement layers and the convenience of operation in the direct cutting test are achieved, the requirements for press load are reduced, and the accuracy and efficiency of the test are improved.
Smart Images
Figure CN223295767U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of road testing, and in particular to a shearing fixture for the shear strength between layers of asphalt specimens. Background Art
[0002] Asphalt pavement, a major pavement type in my country, is widely used on highways. The interlaminar shear strength of asphalt pavements is a key criterion for evaluating their quality, impacting their service life and subsequent maintenance costs. The asphalt pavement interlaminar shear strength shear fixture is essential for testing asphalt pavement interlaminar shear strength.
[0003] Existing asphalt pavement interlayer shear strength tests typically use the oblique cutting method. The asphalt specimen is mounted on a fixture, and a cutter is then attached to the fixture at a 45° angle to the specimen. The cutter is then sheared through the specimen using a universal testing machine. Because the universal testing machine's hydraulic output lever is raised and lowered vertically, the cutter's movement on the fixture is designed to be vertical. This means the asphalt specimen is mounted on the fixture at an angle, requiring the fixture to position the specimen at multiple angles.
[0004] In this regard, at this stage, research has gradually begun on using the straight cutting method instead of the oblique cutting method to test the interlayer shear strength of asphalt pavement. Therefore, at this stage, it is necessary to develop a shear fixture for the interlayer shear strength of asphalt specimens that can be applied to the straight cutting method. Utility Model Content
[0005] In order to provide a shearing fixture for the shear strength between layers of asphalt specimens that can be applied to the straight cutting method, the present application provides a shearing fixture for the shear strength between layers of asphalt specimens.
[0006] This application provides an asphalt specimen interlayer shear strength shear fixture, which adopts the following technical solution:
[0007] A shearing clamp for measuring the interlayer shear strength of an asphalt specimen comprises a clamp body and a cutting piece, wherein the clamp body comprises a first side plate, a second side plate and a top plate; the first side plate and the second side plate are arranged opposite to each other and a cutting chamber is formed therebetween, and the top plate is connected to the tops of the first side plate and the second side plate; the first side plate is provided with a mounting through hole for horizontal insertion of the asphalt specimen; the mounting through hole has a supporting arc surface for supporting the asphalt specimen, and the top plate is provided with a cutter insertion hole for vertical insertion of the cutter piece, and the front end of the cutter piece is provided with an arc-shaped notch that fits the asphalt specimen.
[0008] By adopting the above technical solution, when conducting a straight-cut asphalt pavement interlayer shear strength test, the asphalt specimen can be inserted into the cutting chamber through the mounting hole, with the bonding layer of the asphalt specimen aligned with the cutter, allowing the cutter to cut along the connecting layer, thereby helping to obtain more accurate asphalt pavement interlayer shear strength data. The arc-shaped cut ensures that the cutter fully contacts the asphalt specimen when bearing a compressive load, which improves the accuracy of the data at the beginning of the asphalt pavement interlayer shear strength test.
[0009] Optionally, the first side panel and the second side panel are both arranged vertically, and the top panel is arranged horizontally.
[0010] By adopting the above technical solution, the structure of the first side plate, the second side plate and the top plate forms a gantry structure, so that the ability of the clamp body to bear the pressure load from top to bottom is relatively ideal.
[0011] Optionally, the width of the supporting arc surface is not less than 6 mm.
[0012] By adopting the above technical solution, the width of the supporting arc surface is limited, which helps to place the asphalt specimen on the first side plate before the test and reduces the probability of the asphalt specimen falling from the fixture body.
[0013] Optionally, the cutting blade comprises a handle portion and a blade portion, and the blade portion has an inwardly concave arc-shaped blade surface on a side facing away from the mounting through hole.
[0014] By adopting the above technical solution, the setting of the arc-shaped blade surface in the blade portion enables the cutter to be driven smoothly to shear the asphalt specimen with a smaller load, which helps to reduce the maximum load requirement of the press for the asphalt pavement interlayer shear strength test.
[0015] Optionally, the horizontal cross-section of the cutter socket matches the horizontal cross-section of the handle.
[0016] By adopting the above technical solution, the cutter socket can guide the vertical sliding of the handle, ensuring that the cutter can maintain vertical movement, which helps to obtain more accurate data on the shear strength between asphalt pavement layers.
[0017] Optionally, the second side panel has a horizontally arranged adjustment through-hole, and the second side panel is also provided with an adjustment assembly for adjusting the axial position of the asphalt specimen, the adjustment assembly including an adjustment support detachably mounted on the second side panel, an adjustment rod threaded through the adjustment support and through the adjustment through-hole, an abutment joint mounted in the adjustment rod at one end facing the asphalt specimen, and a rotating handle mounted in the adjustment rod at one end away from the asphalt specimen; the rotation axis of the adjustment rod coincides with the axis of the mounting through-hole.
[0018] By adopting this technical solution, after the asphalt specimen is installed in the mounting hole, the axial position of the asphalt specimen can be adjusted using the adjustment assembly so that the bonding layer of the asphalt specimen is aligned with the cutting element. The adjustment assembly is also relatively simple to adjust; simply turning the rotary handle adjusts the position of the adjustment lever, thereby pushing the asphalt specimen to the appropriate position. Compared to an operator manually grasping the asphalt specimen to move it axially, using this adjustment assembly to adjust the asphalt specimen is more convenient and more accurate.
[0019] The adjustment support is detachably mounted on the second side plate, so that the adjustment component can be removed from the fixture body after the asphalt specimen is installed, thereby avoiding the influence of the adjustment component on the test results during the test.
[0020] Optionally, the adjustment support has a mounting portion and a rotating portion, the mounting portion is threadedly engaged with the adjustment through hole, and the rotating portion is located outside the adjustment through hole.
[0021] By adopting the above technical solution, a specific installation structure of the adjustment support and the second side plate is disclosed, and by adopting the above structure, the rotating part can assist in the disassembly and assembly of the adjustment support on the second side plate.
[0022] Optionally, the abutment head has a rotation hole for mounting the adjusting rod, and a rotation bearing is arranged in the rotation hole, and the end of the adjusting rod is inserted into the inner ring of the rotation bearing.
[0023] By adopting the above technical solution, a rotating connection structure is formed between the abutment and the adjustment rod, so that when the adjustment rod is rotated, the abutment will not be driven to rotate, and thus the asphalt specimen will not be driven to rotate during the adjustment process, thereby facilitating the adjustment of the asphalt specimen to the appropriate position.
[0024] In summary, this application includes at least one of the following beneficial technical effects:
[0025] A shearing fixture for the interlayer shear strength of asphalt specimens is provided. The fixture body and a cutting piece are provided. The fixture body has a mounting hole for placing the asphalt specimen. The cutting piece is vertically slidably mounted on the fixture body so that the asphalt specimen and the cutting piece are perpendicular to each other. This provides an asphalt specimen interlayer shear strength shearing fixture for asphalt pavement interlayer shear strength tests performed using the straight cutting method.
[0026] By matching the size of the cutter handle with the size of the cutter socket, the cutter socket can guide the cutter, which helps to obtain more accurate data on the shear strength between asphalt pavement layers.
[0027] By providing an adjustment component capable of adjusting the axial position of the asphalt test piece, the bonding layer of the asphalt test piece can be aligned with the cutting piece more conveniently and accurately. BRIEF DESCRIPTION OF THE DRAWINGS
[0028] Figure 1 It is a cross-sectional schematic diagram of the shearing fixture for the interlayer shear strength of the asphalt specimen in Example 1.
[0029] Figure 2 This is a top view of the shear clamp for measuring the interlayer shear strength of the asphalt specimen in Example 1.
[0030] Figure 3 This is a front view of the cutter member in Example 1.
[0031] Figure 4 It is a cross-sectional schematic diagram of the shearing fixture for the interlayer shear strength of the asphalt specimen in Example 2.
[0032] Figure 5 It is a schematic diagram of the matching structure of the adjusting rod and the abutment joint in Example 2.
[0033] Explanation of the accompanying drawings: 1. Clamp body; 11. First side plate; 12. Second side plate; 13. Top plate; 14. Cutting chamber; 15. Mounting through hole; 151. Support arc surface; 16. Cutter insertion hole; 17. Adjustment through hole; 2. Cutter piece; 21. Handle portion; 22. Blade portion; 23. Arc-shaped notch; 24. Arc-shaped blade surface; 3. Adjustment assembly; 31. Adjustment support; 311. Mounting portion; 312. Rotating portion; 32. Adjustment rod; 33. Abutment joint; 331. Rotating hole; 332. Rotating bearing; 333. Friction pad; 34. Rotating handle. DETAILED DESCRIPTION
[0034] The following is combined with Figure 1-5 This application is described in further detail.
[0035] The present invention discloses an asphalt specimen interlayer shear strength shear fixture for use in asphalt pavement interlayer shear strength tests, wherein the asphalt specimen used includes a high-strength concrete layer, a bonding layer, and an asphalt layer.
[0036] Example 1
[0037] Reference Figure 1 The asphalt specimen interlayer shear strength shearing fixture includes a fixture body 1 and a cutting piece 2 detachably mounted on the fixture body 1 .
[0038] Reference Figure 1 and Figure 2The clamp body 1 has a gantry-shaped structure and includes a first side panel 11, a second side panel 12 and a top panel 13. The first side panel 11 and the second side panel 12 are arranged relative to each other and are both vertically arranged. A cutting chamber 14 is formed between the first side panel 11 and the second side panel 12, which runs through the front and rear ends of the clamp body 1, so that the operator can observe the situation in the cutting chamber 14. The top panel 13 is installed on the top of the first side panel 11 and the second side panel 12. In this embodiment, the top panel 13 and the first side panel 11 are fixed by two bolts, that is, a countersunk hole is provided on the top panel 13, and a threaded hole corresponding to the countersunk hole is provided on the top of the first side panel 11. The bolts lock the first side panel 11 and the top panel 13 through the countersunk hole and the threaded hole. The top panel 13 and the second side panel 12 are also connected by bolts, and the connection structure is consistent with the connection structure of the top panel 13 and the first side panel 11.
[0039] Reference Figure 1 The first side panel 11 is provided with a mounting hole 15 for arranging the asphalt specimen. The mounting hole 15 has a supporting arc surface 151 for supporting the asphalt specimen. The size of the mounting hole 15 is adapted to the asphalt specimen so that the end of the asphalt specimen can pass through the mounting hole 15 and remain mounted on the first side panel 11. In order to ensure that the asphalt specimen can be stably mounted on the first side panel 11, the width of the supporting arc surface 151 is not less than 6 mm. In this embodiment, the asphalt specimen is a cylindrical specimen, and the cross-section of the mounting hole 15 is circular.
[0040] Reference Figure 1 and Figure 2 The top plate 13 is provided with a cutter insertion hole 16 for vertically inserting the cutter member 2 on one side close to the first side plate 11. The cutter insertion hole 16 runs through the cutting chamber 14, and the horizontal cross-section of the cutter insertion hole 16 is an elongated rectangle.
[0041] Reference Figure 1 and Figure 3 The cutter 2 includes a handle 21 and a blade 22. The handle 21 is in the shape of a rectangular plate, and the horizontal cross-section of the handle 21 matches the horizontal cross-section of the cutter insertion hole 16. When the cutter 2 is inserted from top to bottom into the cutter insertion hole 16, the cutter insertion hole 16 can guide the cutter 2, allowing the movement of the cutter 2 to remain in the vertical direction.
[0042] Reference Figure 1 and Figure 3 The blade portion 22 has an arc-shaped notch 23 that fits the asphalt test piece, so that when the cutter 2 abuts the upper side of the asphalt test piece, the blade portion 22 can fit the asphalt test piece. The blade portion 22 has an inwardly concave arc-shaped blade surface 24 on the side facing away from the mounting hole 15.
[0043] The above-mentioned asphalt specimen interlayer shear strength shear fixture is used in the asphalt pavement interlayer shear strength test of the direct cutting method. The specific experimental steps are as follows: 1) Place the asphalt specimen in a constant temperature box with a pre-set temperature for insulation, and the insulation time is not less than 3 hours; the commonly used experimental temperature is 25°C and 60°C; 2) Place the asphalt specimen interlayer shear strength shear fixture on the electronic ring stiffness testing machine, and place the insulated asphalt specimen in the above-mentioned asphalt specimen interlayer shear strength shear fixture, and make the high-strength concrete layer located on the outside of the fixture body, and the bonding layer and the asphalt layer are in the cutting chamber 14 and in a suspended state; 3) Start the electronic ring stiffness testing machine, and load the cutter 2 at a uniform speed, so that the cutter 2 gradually cuts into the asphalt specimen until it is destroyed.
[0044] Example 2
[0045] Reference Figure 4 The asphalt specimen interlayer shear strength shear fixture in Example 2 is the same as that in Example 1 except that the adjustment component 3 and the second side plate 12 are provided with an adjustment through hole 17.
[0046] Reference Figure 4 The second side plate 12 is provided with a horizontally arranged adjustment hole 17, the axis of which coincides with the axis of the mounting hole 15 on the first side plate 11. An adjustment assembly 3 for adjusting the axial position of the asphalt test piece is also provided on the second side plate 12. The adjustment assembly 3 comprises an adjustment support 31 detachably mounted on the second side plate 12, an adjustment rod 32 threadedly passing through the adjustment support 31 and the adjustment hole 17, an abutment 33 mounted on the end of the adjustment rod 32 facing the asphalt test piece, and a rotating handle 34 mounted on the end of the adjustment rod 32 away from the asphalt test piece.
[0047] Reference Figure 4 The adjustment support 31 includes a mounting portion 311 that threads into the adjustment hole 17 and a rotating portion 312 located outside the adjustment hole 17. The outer surface of the rotating portion 312 is provided with friction patterns to facilitate assembly and disassembly of the adjustment support 31 from the second side plate 12. The adjustment support 31 includes a coaxially arranged screw hole that engages with the adjustment rod 32, ensuring that the rotation axis of the adjustment rod 32 coincides with the axis of the mounting hole 15. Rotation of the adjustment rod 32 allows for forward and reverse movement.
[0048] Reference Figure 4 and Figure 5 The abutment 33 has a rotation hole 331 for mounting the adjustment rod 32 and a rotation bearing 332 is arranged in the rotation hole 331. The end of the adjustment rod 32 is inserted into the inner ring of the rotation bearing 332. A friction pad 333 is also arranged on the end surface of the abutment 33.
[0049] The above-mentioned adjustment component 3 can be installed on the fixture body 1 before the test. The asphalt test piece is adjusted to a suitable position through the adjustment component 3, and then the adjustment component 3 is removed from the fixture body 1 to avoid the adjustment component 3 interfering with the test.
[0050] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.
Claims
1. A shearing fixture for measuring the interlayer shear strength of asphalt specimens, characterized in that: The invention comprises a clamp body (1) and a cutting blade (2), wherein the clamp body (1) has a first side plate (11), a second side plate (12) and a top plate (13); the first side plate (11) and the second side plate (12) are arranged relative to each other and a cutting chamber (14) is formed therebetween, and the top plate (13) is connected to the tops of the first side plate (11) and the second side plate (12); the first side plate (11) is provided with a mounting hole (15) for horizontal insertion of an asphalt test piece; the mounting hole (15) has a supporting arc surface (151) for supporting the asphalt test piece, and the top plate (13) is provided with a cutting blade insertion hole (16) for vertical insertion of the cutting blade (2), and the front end of the cutting blade (2) is provided with an arc-shaped notch (23) that fits the asphalt test piece.
2. The asphalt specimen interlayer shear strength shear fixture according to claim 1, characterized in that: The first side panel (11) and the second side panel (12) are both arranged vertically, and the top panel (13) is arranged horizontally.
3. The asphalt specimen interlayer shear strength shear fixture according to claim 1, characterized in that: The width of the supporting arc surface (151) is not less than 6 mm.
4. The asphalt specimen interlayer shear strength shear fixture according to claim 1, characterized in that: The cutting blade (2) comprises a handle portion (21) and a blade portion (22), wherein the blade portion (22) has an inwardly concave arcuate blade surface (24) on a side facing away from the mounting through hole (15).
5. The asphalt specimen interlayer shear strength shear fixture according to claim 4, characterized in that: The horizontal cross section of the cutter insertion hole (16) matches the horizontal cross section of the knife handle (21).
6. The asphalt specimen interlayer shear strength shear fixture according to claim 1, characterized in that: The second side plate (12) has a horizontally arranged adjustment through hole (17). The second side plate (12) is also provided with an adjustment assembly (3) for adjusting the axial position of the asphalt test piece. The adjustment assembly (3) comprises an adjustment support (31) detachably mounted on the second side plate (12), an adjustment rod (32) threadedly passing through the adjustment support (31) and the adjustment through hole (17), an abutment joint (33) mounted on the adjustment rod (32) at one end facing the asphalt test piece, and a rotating handle (34) mounted on the adjustment rod (32) at one end away from the asphalt test piece. The rotation axis of the adjustment rod (32) coincides with the axis of the mounting through hole (15).
7. The asphalt specimen interlayer shear strength shear fixture according to claim 6, characterized in that: The adjustment support (31) comprises a mounting portion (311) and a rotating portion (312), wherein the mounting portion (311) is threadedly engaged with the adjustment through hole (17), and the rotating portion (312) is located outside the adjustment through hole (17).
8. The asphalt specimen interlayer shear strength shear fixture according to claim 6, characterized in that: The abutment joint (33) has a rotation hole (331) for mounting the adjustment rod (32), and a rotation bearing (332) is arranged in the rotation hole (331). The end of the adjustment rod (32) is inserted into the inner ring of the rotation bearing (332).