Oblique shearing device for measuring interlayer bonding strength

Abstract

An oblique shearing device for measuring interlayer bonding strength comprises an upper clamp which is a wedge-shaped device with a groove position on the whole, and an upper height adjusting bottom plate with the height capable of being adjusted up and down is arranged in a lower groove; the lower clamp is also a wedge-shaped device with a groove position, the groove of the lower clamp is opposite to the groove of the upper clamp, and a lower height adjusting bottom plate capable of adjusting the height up and down is also arranged at the position of the groove; when a test sample is placed in the groove positions of the upper clamp and the lower clamp, the oblique shear action sections of the upper clamp and the lower clamp can be quickly aligned to the interlayer bonding position of the test sample by adjusting the positions of the upper height adjusting bottom plate and the lower height adjusting bottom plate. According to the utility model, the bottom plate capable of vertically adjusting the height is arranged at the 45-degree section positions of the upper clamp and the lower clamp, so that the matching property of the whole mold and a double-layer test sample is greatly improved, and the oblique shearing action sections of the upper clamp and the lower clamp can be more conveniently and quickly aligned to the interlayer bonding position of the test sample by adjusting the height of the bottom plate.

Description

Technical Field

[0001] The utility model relates to the technical field of road administration test devices, in particular to an oblique shearing device for measuring interlayer bonding strength. Background Art

[0002] Asphalt pavement is a layered composite structure, in which each different structural layer has different functions and roles. Sufficient shear strength must be ensured between each layer to prevent relative slippage between layers and maintain the stability of the entire structure. If the shear strength between asphalt pavement layers is insufficient, the risk of road surface problems such as pavement shifting, crack expansion, and road surface undulation and deformation will be greatly increased, seriously affecting driving safety and comfort on the road and shortening the service life of the road.

[0003] Therefore, the transportation industry generally uses shear strength tests to test the shear strength of the asphalt layer and the underlying structure to evaluate the shear resistance of the asphalt pavement composite structure. Figure 1 The compression-shear test device is used for testing. Its main feature is that the mold body is divided into two upper and lower clamps. The lower part of the upper clamp and the upper part of the lower clamp are both provided with a 45° wedge-shaped section with a certain height for placing the test sample (double-layer structure sample) and realizing position limiting; secondly, before the test officially starts, it is necessary to place a rollable roller on the top of the upper clamp, and place a plate above the press head and roller to convert the vertical pressure applied by the press into horizontal and vertical components, so as to realize 45° oblique shearing effect on the test sample.

[0004] However, the traditional press-shear die has great limitations. Figure 1 Because the height of the 45° wedge-shaped sections at the bottom of the upper fixture and the top of the lower fixture is fixed, the height of the upper and lower layers of the prepared test sample must be consistent with the height of the two wedge-shaped sections. This allows the oblique shear sections of the upper and lower fixtures to align with the interlayer bonding position of the test sample, allowing for accurate shear strength measurements. Generally speaking, the height of double-layer test samples formed indoors or pavement core samples retrieved from the field cannot directly meet the height requirements of the wedge-shaped fixtures. Before testing, the samples must be precisely cut, a labor-intensive and inefficient process. Furthermore, if the cutting height is slightly inaccurate or the cutting surface is not level, the sample must be discarded and remade, significantly increasing the test cycle.

[0005] Before testing, a rolling roller must be placed on top of the upper fixture. However, because this roller is a non-fixed assembly, it may deflect when subjected to the pressure of the press. The horizontal force component obtained by the roller is not completely parallel to the outer surface of the fixture, affecting the accuracy of the shear strength results. Furthermore, when the pressure of the press is released, the roller may slip and fall, causing damage to the roller or injury to the tester. Utility Model Content

[0006] The purpose of the utility model is to provide an oblique shearing device for measuring interlayer bonding strength, so as to solve the technical problems pointed out in the background technology.

[0007] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0008] An oblique shear device for measuring interlayer bonding strength, comprising:

[0009] The upper fixture is a wedge-shaped device with a groove. The lower groove is equipped with an upper height-adjustable bottom plate.

[0010] The lower fixture is also a wedge-shaped device with a groove. The groove is opposite to the groove of the upper fixture, and the groove is also provided with a lower height adjustment base plate that can be adjusted up and down.

[0011] Among them, when the test sample is placed in the groove position of the upper and lower clamps, the oblique shear action section of the upper and lower clamps can be quickly aligned with the interlayer bonding position of the test sample by adjusting the position of the upper and lower height adjustment base plates.

[0012] Furthermore, the upper height-adjustable base plate is composed of an upper height-adjustable threaded nail and an upper nesting plate, wherein the upper nesting plate has a groove, the size of which is consistent with the size of the nail cap of the upper height-adjustable threaded nail, and a fixed combination is achieved by nesting; a threaded hole is reserved in the middle of the upper clamp, the size of which is consistent with the nail body of the upper height-adjustable threaded nail, the nail body of the upper height-adjustable threaded nail is threadably connected to the threaded hole, and the upper and lower height adjustment of the upper height-adjustable base plate is achieved by twisting.

[0013] Furthermore, the lower height-adjusting base plate is composed of a lower height-adjusting threaded screw and a lower nested flat plate, and its up and down height adjustment method is the same as that of the upper height-adjusting base plate.

[0014] Furthermore, a plurality of rolling rollers are fixedly provided on the top of the upper clamp, and a force transmission partition is also included for being placed on the rolling rollers, and the force transmission partition is placed between the loading pressure head of the load testing machine and the rolling rollers.

[0015] Furthermore, the upper clamp and the lower clamp are both made of stainless steel.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The utility model provides a bottom plate with adjustable height at the 45° cross-section position of the upper and lower clamps, which greatly improves the compatibility of the mold as a whole with the double-layer test sample. By adjusting the height of the bottom plate, the oblique shearing sections of the upper and lower clamps can be more conveniently and quickly aligned with the bonding position between the layers of the test sample, overcoming the problem that traditional molds require repeated cutting of samples or have a high sample waste rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0019] Figure 1 It is a schematic diagram of the existing technology structure;

[0020] Figure 2 It is a structural diagram of the utility model;

[0021] Figure 3 This is a schematic diagram of the utility model for raising the base plate;

[0022] Figure 4 This is a schematic diagram of the test process of this utility model. DETAILED DESCRIPTION

[0023] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0024] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "vertical", "horizontal", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0025] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, indirect connection through an intermediate medium, internal communication between two components, or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0026] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, a first feature being "above," "above," and "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is at a higher level than the second feature. A first feature being "below," "below," and "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0027] like Figure 1-4 As shown, a diagonal shearing device for measuring interlayer bonding strength comprises:

[0028] The upper fixture 2 is a wedge-shaped device with a groove. The lower groove is provided with an upper height-adjustable bottom plate 201.

[0029] The lower fixture 3 is also a wedge-shaped device with a groove. The groove is opposite to the groove of the upper fixture 2, and a lower height adjustment base plate 301 is also provided at the groove position.

[0030] Among them, when the test sample 1 is placed in the groove position of the upper and lower clamps, the upper and lower base plates 201 and 301 can be adjusted to quickly align the oblique shear action sections of the upper and lower clamps with the interlayer bonding position of the test sample 1.

[0031] Specifically, as shown in the figure, the upper height-adjusting base plate 201 is composed of an upper height-adjusting threaded nail 2011 and an upper nesting plate 2012, wherein the upper nesting plate 2012 has a groove, the size of which is consistent with the size of the nail cap of the upper height-adjusting threaded nail 2011, and a fixed combination is achieved by nesting; a threaded hole is reserved in the middle of the upper clamp 2, the size of which is consistent with the nail body of the upper height-adjusting threaded nail 2011, and the nail body of the upper height-adjusting threaded nail 2011 is threadably connected to the threaded hole, and the upper and lower height adjustment of the upper height-adjusting base plate 201 is achieved by twisting.

[0032] Specifically, as shown in the figure, the lower height adjustment base plate 301 is composed of a lower height adjustment threaded screw 3011 and a lower nested flat plate 3012 , and its up and down height adjustment method is the same as that of the upper height adjustment base plate 201 .

[0033] Specifically, as shown in the figure, a plurality of rolling rollers 202 are fixedly provided on the top of the upper clamp 2, and also includes a force transmission partition 4 for being placed on the rolling rollers 202. The force transmission partition 4 is placed between the loading pressure head of the load testing machine and the rolling rollers 202.

[0034] Specifically, as shown in the figure, the upper clamp 2 and the lower clamp 3 are both made of stainless steel.

[0035] Specifically, the specific implementation process of the utility model is:

[0036] First, place the test sample 1 in the grooves of the upper and lower clamps (i.e., upper clamp 2 and lower clamp 3). Both clamps are wedge-shaped with opposing grooves, which can tightly clamp the test sample and ensure the stability of the sample during the test.

[0037] Next, by adjusting the height of the upper and lower height adjustment base plates 201 and 301, the oblique shear sections of the upper and lower fixtures are aligned with the interlayer bonding position of the test sample 1. This adjustment is achieved by rotating the upper and lower height adjustment threaded screws 2011 and 3011. These screws engage the threaded holes in the fixtures, converting the rotational motion of the threads into up and down movement, thereby precisely adjusting the height of the base plates.

[0038] After adjustment, the force-transmitting diaphragm 4 is placed on the rolling roller 202 and connected to the loading head of the load tester. At the start of the test, the load tester applies pressure, which is transmitted to the upper fixture 2 through the force-transmitting diaphragm 4 and the rolling roller 202, thereby applying an oblique shear force to the test sample 1. Because the oblique shear action sections of the upper and lower fixtures are aligned with the interlayer bond location, the bond strength at this location can be directly tested.

[0039] When the load tester applies a vertical load, the removable partition will slide slightly (i.e., the vertical load applied by the load tester is decomposed into horizontal and vertical forces), thereby enabling the entire device to achieve an oblique shear on the test specimen. Generally, when no load is applied, the partition will not slide on the rolling axle 202, thus preventing the partition from sliding freely and falling.

[0040] Compared with the traditional shearing mold for oblique shear test, the utility model is provided with a bottom plate with adjustable height at the 45° cross-section position of the upper and lower clamps, which greatly improves the compatibility of the mold as a whole with the double-layer test sample. By adjusting the height of the bottom plate, the oblique shearing action section of the upper and lower clamps can be more conveniently and quickly aligned with the bonding position between the layers of the test sample, overcoming the problem that traditional molds require repeated cutting of samples or have a high sample waste rate.

[0041] By setting a rolling roller fixed to the top of the upper fixture, it is ensured that the placement direction of the roller will not deflect when the press applies vertical pressure, thus ensuring the accuracy of the test results; at the same time, it eliminates the problem of non-fixed rollers slipping when pressure is released, thereby increasing the service life of the rollers and ensuring the safety of test personnel.

[0042] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

[0043] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A diagonal shearing device for measuring interlayer bonding strength, characterized in that: include: The upper fixture (2) is a wedge-shaped device with a groove as a whole, and an upper height-adjustable bottom plate (201) is provided in the lower groove; The lower fixture (3) is also a wedge-shaped device with a groove, the groove of which is opposite to the groove of the upper fixture (2), and a lower height adjustment base plate (301) that can be adjusted up and down is also provided at the groove position; When the test sample (1) is placed in the grooves of the upper and lower clamps, the positions of the upper and lower height adjustment base plates (201) and the lower and upper height adjustment base plates (301) can be adjusted to quickly align the oblique shear action sections of the upper and lower clamps with the interlayer bonding position of the test sample (1).

2. The oblique shear device for measuring interlayer bonding strength according to claim 1, characterized in that: The upper height-adjusting base plate (201) is composed of an upper height-adjusting threaded screw (2011) and an upper nesting plate (2012), wherein the upper nesting plate (2012) has a groove, the size of which is consistent with the size of the screw cap of the upper height-adjusting threaded screw (2011), and a fixed combination is achieved by nesting; a threaded hole is left in the middle of the upper clamp (2), the size of which is consistent with the screw body of the upper height-adjusting threaded screw (2011), the screw body of the upper height-adjusting threaded screw (2011) is threadedly connected to the threaded hole, and the upper and lower height adjustment of the upper height-adjusting base plate (201) is achieved by twisting.

3. The oblique shear device for measuring interlayer bonding strength according to claim 2, characterized in that: The lower height adjustment base plate (301) is composed of a lower height adjustment screw thread (3011) and a lower nested flat plate (3012), and its up and down height adjustment method is the same as that of the upper height adjustment base plate (201).

4. The oblique shearing device for measuring interlayer bonding strength according to claim 3, characterized in that: The upper clamp (2) is fixedly provided with a plurality of rolling rollers (202) on the top thereof, and further comprises a force transmission partition (4) for being placed on the rolling rollers (202), wherein the force transmission partition (4) is placed between the loading pressure head of the load testing machine and the rolling rollers (202).

5. The oblique shear device for measuring interlayer bonding strength according to claim 1, characterized in that: The upper clamp (2) and the lower clamp (3) are both made of stainless steel.

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