A polyurethane sealant adhesion performance oblique shear test fixture

Abstract

The utility model discloses a kind of polyurethane crack pouring material adhesion performance oblique shear test clamps, including clamp main frame, the clamp main frame top is equipped with drive cylinder, and the output end of drive cylinder is connected with upper pressure head, the bottom of upper pressure head is equipped with lower clamp seat, and lower clamp seat bottom is equipped with pedestal, the pedestal end portion is equipped with table, and the inside of table is equipped with lower concrete block, the upper side of lower concrete block is connected with crack pouring material block, and the upper side of crack pouring material block is connected with upper concrete block.The polyurethane crack pouring material adhesion performance oblique shear test clamps, utilize 45 degrees oblique lower pressure inclined plane and stress inclined plane cooperation transmission power, vertical driving force of drive cylinder can be stably converted into transverse clamping force of lower clamp seat, power transmission efficiency is high and clamping force is stable;Realize the shear force received under the simulation of crack pouring material block filling joint state, provide key data support for subsequent optimization material formula and construction technology.

Description

Technical Field

[0001] This utility model relates to the field of municipal engineering, specifically a clamp for a shear test of the adhesion performance of polyurethane grout. Background Technology

[0002] Cracking of asphalt pavements is mainly caused by a combination of temperature changes, repeated loading, and material aging. Repair methods should be selected according to the type of crack, such as grouting, sealing, or overall milling and repaving. In winter, when the temperature is low, the asphalt material hardens and becomes brittle, and the volume shrinkage generates tensile stress. When the stress exceeds the tensile strength of the asphalt itself, transverse or longitudinal cracks will appear on the pavement. Long-term vehicle rolling will cause fatigue damage to the pavement base layer. In particular, the repeated action of heavy vehicles will cause the base layer cracks to reflect upwards, forming pavement cracks. Long-term exposure to sunlight and rain will cause asphalt aging and a decrease in adhesion. At the same time, the failure of the bond interface between the pavement aggregate and the asphalt will also cause cracks. In the process of repairing road cracks, crack sealant is usually used to repair the cracks. However, the insufficient adhesion performance of crack sealant is the main reason why crack sealant peels off from the crack and falls off, resulting in repair failure. Therefore, it is necessary to use a crack sealant adhesion strength testing device to test the adhesion effect of crack sealant and provide key data support for optimizing material formulation and construction process. To this end, we provide a polyurethane crack sealant adhesion performance oblique shear test fixture, which more realistically simulates the shear stress caused by temperature shrinkage, traffic load and other factors in cracks. Utility Model Content

[0003] The purpose of this invention is to provide a shear test fixture for the adhesion performance of polyurethane sealant, so as to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, a shear test fixture for the adhesion performance of polyurethane sealant is provided, comprising a main frame, a drive cylinder at the top of the main frame, an upper pressure head connected to the output end of the drive cylinder, a lower clamping seat at the bottom of the upper pressure head, a base at the bottom of the lower clamping seat, a platform at the end of the base, a lower concrete block inside the platform, a sealant block connected to the upper side of the lower concrete block, and an upper concrete block connected to the upper side of the sealant block.

[0005] Furthermore, the main frame of the fixture has multiple sets of guide openings equidistantly provided on its top, and guide rods are inserted inside the guide openings, with the bottom of the guide rods fixed to the upper pressure head.

[0006] Furthermore, both the upper pressure head and the lower clamp are right-angled trapezoids, and the bottom of the upper pressure head is provided with a downward pressing slope. The surface of the lower clamp is provided with a force-bearing slope, and both the force-bearing slope and the downward pressing slope are inclined at 45 degrees.

[0007] Furthermore, the force-bearing inclined surface and the downward-pressing inclined surface overlap each other, and the upper pressure head is driven downward by the drive cylinder to drive the lower clamp to move laterally.

[0008] Furthermore, a slot is provided on the back of the lower clamp, and an upper concrete block is provided inside the slot.

[0009] Furthermore, both sides of the bottom of the lower clamp are provided with limiting seats, and the limiting seats are slidably disposed inside the limiting track, which is opened on the surface of the base.

[0010] Furthermore, a spring is fixed to the end of the limiting seat, and the end of the spring away from the limiting seat is fixed to the side wall of the limiting track. The lower clamp moves laterally along the limiting track and performs a shear test on the grout block between the upper and lower concrete blocks.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows: the cooperation between the guide rod and the guide port, and the cooperation between the limiting seat and the limiting track, respectively ensure the stability of the movement of the upper pressure head and the lower clamping seat, avoiding deviation during the movement and affecting the clamping effect; by using the 45-degree inclined downward pressure surface and the force-bearing inclined surface to transmit power, the vertical driving force of the drive cylinder can be stably converted into the lateral clamping force of the lower clamping seat, resulting in high power transmission efficiency and stable clamping force; and the shear force experienced by the grout block under the simulated grouting state is realized, providing key data support for subsequent optimization of material formula and construction process. Attached Figure Description

[0012] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a bottom view of the structure of this utility model; Figure 3 This is a top view of the structure of this utility model; Figure 4 This is a cross-sectional view of the structure of this utility model; Figure 5 This is an exploded view of the structure of this utility model.

[0013] The following are the labels in the diagram: 1. Main frame of the clamp; 2. Drive cylinder; 3. Guide rod; 4. Upper pressure head; 5. Lower clamp seat; 51. Slot; 6. Limit seat; 7. Limit track; 8. Base; 9. Grinding platform; 10. Grout block; 101. Upper concrete block; 102. Lower concrete block. Detailed Implementation

[0014] Please see Figure 1-5This utility model provides a clamp for a shear test of the adhesion performance of polyurethane grout, including a clamp main frame 1, a drive cylinder 2 at the top of the clamp main frame 1, and an upper pressure head 4 connected to the output end of the drive cylinder 2. A lower clamping seat 5 is provided at the bottom of the upper pressure head 4, and a base 8 is installed at the bottom of the lower clamping seat 5. A platform 9 is provided at the end of the base 8, and a lower concrete block 102 is provided inside the platform 9. A grout block 10 is connected to the upper side of the lower concrete block 102, and an upper concrete block 101 is connected to the upper side of the grout block 10.

[0015] In a preferred embodiment, the top of the main frame 1 of the fixture is provided with multiple sets of guide openings at equal intervals, and guide rods 3 are inserted inside the guide openings, with the bottom of the guide rods 3 fixed on the upper pressure head 4.

[0016] Both the upper pressure head 4 and the lower clamp 5 are right-angled trapezoids, and the bottom of the upper pressure head 4 is provided with a downward pressing slope, and the surface of the lower clamp 5 is provided with a force-bearing slope, and both the force-bearing slope and the downward pressing slope are inclined at 45 degrees.

[0017] The force-bearing inclined surface and the downward-pressing inclined surface overlap each other. The upper pressure head 4 is driven downward by the drive cylinder 2, which in turn drives the lower clamp 5 to move laterally.

[0018] The back of the lower clamp 5 is provided with a slot 51, and the slot 51 is provided with an upper concrete block 101.

[0019] Both sides of the bottom of the lower clamp 5 are provided with limiting seats 6, and the limiting seats 6 are slidably disposed inside the limiting rail 7, which is opened on the surface of the base 8.

[0020] Working principle: First, the upper concrete block 101 and the lower concrete block 102 are bonded and fixed together using a joint filler block 10. The lower concrete block 102 is then secured inside the fixture 9. Next, the end of the upper concrete block 101 is secured inside the slot 51. Then, the drive cylinder 2 is activated, and the output end of the drive cylinder 2 pushes the upper pressure head 4 downward. Because multiple sets of guide openings are equidistantly opened on the top of the fixture main frame 1, the upper pressure head 4 can maintain a stable vertical downward movement under the sliding action of the guide rod 3 along the guide openings. Furthermore, because both the upper pressure head 4 and the lower clamping seat 5 are right-angled trapezoids, the force-bearing inclined surface and the downward pressure inclined surface are both inclined at 45 degrees. Since the upper pressure head 4 and the lower clamping seat 5 are covered together, when the upper pressure head 4 moves downward, the downward pressure slope at its bottom will exert a squeezing force on the force-bearing slope on the surface of the lower clamping seat 5. This squeezing force will be decomposed into a driving force that causes the lower clamping seat 5 to move laterally. At the same time, since there are limit seats 6 on both sides of the bottom of the lower clamping seat 5, the lower clamping seat 5 can maintain stable lateral movement under the sliding limit action of the limit seats 6 along the limit track 7. At this time, when the lower clamping seat 5 moves laterally, it can apply a lateral shear force to the grouting block 10, so as to realize the shear resistance test of the grouting block 10. When it is necessary to release the workpiece, the output end of the control drive cylinder 2 retracts upward, driving the upper pressure head 4 to move upward. The squeezing force of the upper pressure head 4 on the lower clamping seat 5 disappears, the spring resets, and the lower clamping seat 5 is driven back to the initial position. The cooperation between guide rod 3 and guide opening, and between limit seat 6 and limit track 7, ensures the stability of the movement of upper pressure head 4 and lower clamping seat 5, avoiding deviation during movement that would affect the clamping effect. By using the 45-degree inclined downward pressure surface and force-bearing inclined surface to transmit power, the vertical driving force of drive cylinder 2 can be stably converted into the lateral clamping force of lower clamping seat 5, resulting in high power transmission efficiency and stable clamping force. This simulates the shear force experienced by the grout block 10 under the grouting state, providing key data support for subsequent optimization of material formula and construction process. In a preferred embodiment, a spring is fixed to the end of the limiting seat 6, and the end of the spring away from the limiting seat 6 is fixed to the side wall of the limiting track 7. The lower clamp 5 moves laterally along the limiting track 7 and performs a shear test on the grout block 10 between the upper concrete block 101 and the lower concrete block 102.

[0021] The spring fixed at the end of the limiting seat 6 is connected to the side wall of the limiting track 7. When the lower clamp 5 is driven by the drive cylinder 2 through the upper pressure head 4 to move laterally along the limiting track 7, the spring will undergo elastic deformation and store elastic potential energy as the limiting seat 6 moves. When the drive cylinder 2 drives the upper pressure head 4 to reset upward and the squeezing force on the lower clamp 5 disappears, the spring can drive the limiting seat 6 to slide in the opposite direction along the limiting track 7 through its own elastic restoring force, thereby pulling the lower clamp 5 to reset automatically. There is no need to manually push the lower clamp 5 to reset, which greatly improves the convenience of operation and reduces the number of manual intervention steps. When conducting the shear test on the grout block 10 between the upper concrete block 101 and the lower concrete block 102, the elasticity of the spring can buffer and adjust the lateral movement speed and force of the lower clamp 5, preventing the lower clamp 5 from impacting the grout block 10 due to excessive movement speed or sudden increase in force, ensuring that the grout block 10 is subjected to stable force during the shear test and reducing experimental errors. Before conducting the shear test, the dimensions of the upper concrete block 101 and the lower concrete block 102 need to be reduced and adjusted so that the end of the upper concrete block 101 can be locked inside the slot 51, and the bottom of the lower concrete block 102 can be locked inside the platform, ensuring that the test can be carried out normally.

Claims

1. A fixture for a shear test of the adhesion performance of polyurethane sealant, comprising a main fixture frame (1), characterized in that: The main frame (1) of the clamp is provided with a drive cylinder (2) at the top, and the output end of the drive cylinder (2) is connected to an upper pressure head (4). The bottom of the upper pressure head (4) is provided with a lower clamping seat (5), and a base (8) is installed at the bottom of the lower clamping seat (5). The end of the base (8) is provided with a treatment platform (9), and the interior of the treatment platform (9) is provided with a lower concrete block (102). The upper side of the lower concrete block (102) is connected to a grouting block (10), and the upper side of the grouting block (10) is connected to an upper concrete block (101).

2. The polyurethane sealant adhesion performance oblique shear test fixture according to claim 1, characterized in that: The main frame (1) of the fixture has multiple sets of guide openings at equal intervals on its top, and guide rods (3) are inserted inside the guide openings. The bottom of the guide rods (3) is fixed on the upper pressure head (4).

3. The polyurethane sealant adhesion performance oblique shear test fixture according to claim 1, characterized in that: The upper pressure head (4) and the lower clamp (5) are both right-angled trapezoids, and the bottom of the upper pressure head (4) is provided with a downward pressure slope. The surface of the lower clamp (5) is provided with a force-bearing slope, and both the force-bearing slope and the downward pressure slope are inclined at 45 degrees.

4. The polyurethane sealant adhesion performance oblique shear test fixture according to claim 3, characterized in that: The force-bearing inclined surface and the downward-pressing inclined surface are covered together. The upper pressure head (4) is driven to move downward by the drive cylinder (2), which in turn drives the lower clamp (5) to move laterally.

5. The polyurethane sealant adhesion performance oblique shear test fixture according to claim 4, characterized in that: The lower clamp (5) has a slot (51) on its back side, and an upper concrete block (101) is provided inside the slot (51).

6. The polyurethane sealant adhesion performance oblique shear test fixture according to claim 5, characterized in that: The lower clamp (5) is provided with limiting seats (6) on both sides of the bottom, and the limiting seats (6) are slidably disposed inside the limiting track (7), which is opened on the surface of the base (8).

7. The polyurethane sealant adhesion performance oblique shear test fixture according to claim 6, characterized in that: The end of the limiting seat (6) is fixed with a spring, and the end of the spring away from the limiting seat (6) is fixed on the side wall of the limiting track (7). The lower clamp (5) moves laterally along the limiting track (7) and performs a shear test on the grout block (10) between the upper concrete block (101) and the lower concrete block (102).

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