CN203629982U - Vertical shearing fatigue testing machine of jointing material - Google Patents

Abstract

The utility model discloses a vertical shear fatigue testing machine for testing cement concrete road surface joint materials, which belongs to the technical field of road engineering. The testing machine is composed of a cement concrete specimen fixture and a loading device; the upper part of the cement concrete specimen fixture is composed of a top plate, two vertically downward side plates fixed to the top plate and a fixed cement concrete specimen, and the lower part It is composed of a guide plate and a cement concrete specimen that can slide horizontally; the joint material is filled between two cement concrete specimens; the loading device is composed of a motor and an elliptical loading plate; the motor rotates to drive the elliptical loading plate through a chain Linkage, the elliptical loading plate and the cement concrete specimen produce a cycle of contact-separation-contact-separation, so as to realize the vertical shear fatigue simulation process of loading-unloading-loading-unloading, and can carry out vertical shear fatigue simulation of cement concrete pavement joint materials. Effective test of fatigue performance in the vertical direction.

Description

A vertical shear fatigue testing machine for joint materials

technical field

The utility model belongs to the technical field of road engineering, in particular to a vertical shear fatigue testing machine for testing cement concrete road surface joint materials.

Background technique

Fatigue testing machine is a test tool used to test the quality and performance of materials under repeated loads. The vertical shear fatigue tester for joint material is mainly used for the fatigue performance of cement concrete pavement joint material under the repeated vertical shear action of vehicles.

After the cement concrete pavement is paved, the quality of the joint material directly affects the disease type of the cement concrete panel and the service life of the cement concrete pavement. With the continuous improvement of the quality of joint materials, its tensile strength, bond strength and other indicators have met the road use requirements, but with the development of multi-axis and heavy-duty vehicles, high-frequency shear fatigue damage has become a However, the current code does not have clear requirements for the fatigue performance of pavement joint materials, so there is also a lack of corresponding evaluation methods and standards.

Contents of the invention

In order to solve the problem of shear fatigue failure of cement concrete pavement joint materials caused by the above-mentioned multi-axis and heavy-duty vehicles, the utility model discloses a simple and practical vertical shear fatigue tester for joint materials, which is used to simulate The relative motion between cement concrete slabs after bonding with joint materials, so as to evaluate the shear fatigue performance of joint materials in the vertical direction.

The joint material vertical shear fatigue testing machine designed by the utility model is composed of a cement concrete specimen fixture and a loading device; the cement concrete specimen fixture is divided into upper and lower parts, and the upper part consists of a top plate 1, The two vertically downward side plates 2 fixed to the top plate are composed of a fixed cement concrete specimen 5, and the lower part is composed of a guide plate 6 and a cement concrete specimen 7 that can slide horizontally along the guide plate 6; the top plate 1 and the guide plate 6 is set horizontally, the top plate 1 is on the top, and the guide plate 6 is on the bottom; a round hole is reserved on the side plate 2, and the screw 3 is connected with the nut 4 preset in the cement concrete test piece 5 through the round hole, and the cement concrete test piece 5 is embedded Among the top plate 1 and the side plates 2; the joint material 10 is filled between the bottom of the cement concrete specimen 5 and the top of the cement concrete specimen 7;

The loading device is composed of a motor 8 and an elliptical loading disc 9; the driven wheel of the motor 8 is coaxially fixedly connected with the elliptical loading disc 9 at the focal point of the ellipse; the rotation of the motor 8 drives the elliptical loading disc 9 to be linked by a chain , when the elliptical loading plate 9 turns to the horizontal position and one side of the long semi-axis is in contact with the cement concrete specimen 7 and hits the cement concrete specimen 7 to move in the horizontal direction.

The distance between the two side plates 2 is 15-20cm.

The nut 4 is a nut with one end closed.

The motor 8 can provide the elliptical loading disk 9 with a rotational speed not less than 17 revolutions/s.

When the joint material vertical shear fatigue testing machine designed by the utility model is working, the motor rotates through the chain to drive the elliptical loading plate to rotate, and the elliptical loading plate and the cement concrete specimen produce a cycle of contact-separation-contact-separation , so that the vertical shear fatigue simulation process of loading-unloading-loading-unloading can be realized, and the fatigue performance of cement concrete pavement joint materials in the vertical direction can be effectively tested.

Description of drawings

Fig. 1 is the structural representation of the joint material vertical shear fatigue testing machine designed by the utility model, among the figure 1-top plate, 2-side plate, 3-screw, 4-nut, 5-cement concrete test piece, 6- Guide plate, 7-cement concrete specimen, 8-motor, 9-elliptical loading plate, 10-joint material.

Detailed ways

Example 1

As shown in Figure 1, the vertical shear fatigue testing machine for joint materials consists of two parts: a cement concrete specimen fixing device and a loading device.

Cement concrete specimen fixing device is divided into upper and lower parts, the upper part is composed of top plate 1, two vertically downward side plates 2 fixed with the top plate and fixed cement concrete specimen 5, the lower part is composed of guide plate 6 and along the guide plate 6 The cement concrete specimen 7 that can slide in the horizontal direction is composed of; the top plate 1 is a steel plate with a length, width, and thickness of 25 cm, 25 cm, and 1 cm respectively; the side plate 2 is a steel plate with a length, width, and thickness of 15 cm, 15 cm, and 1 cm, respectively. Both sides plate 2 spacings are 15cm, and guide plate 6 is the steel plate that length, width, thickness are respectively 50cm, 25cm, 1cm, and top plate 1 and guide plate 6 are horizontally arranged, and top plate 1 is on, and guide plate 6 is below, distance 32cm; Four round holes with a diameter of 0.8cm are arranged on the board 2 on average. The screw 3 is 4cm long and 0.7cm in diameter. The nut 4 used with the screw is 3.5cm long and one end is closed. The nuts 4 in the 15cm high cement concrete test piece 5 are connected, and the cement concrete test piece 5 is embedded in the top plate 1 and the two side plates 2; the joint material 10 is filled in the bottom of the cement concrete test piece 5 and the cement concrete test piece 7 between the tops;

Described loading device is made up of motor 8 and ellipse loading dish 9; The size of ellipse loading dish 9 is major semiaxis 49cm, minor semiaxis 36cm, and the driven wheel of motor 8 and ellipse loading dish 9 are on the left side of ellipse. The focus position is coaxially fixedly connected; the rotation of the motor 8 drives the elliptical loading disc 9 to be linked through the chain, and the motor 8 can provide the elliptical loading disc 9 with a speed of 0-17 rpm. When the elliptical loading disc 9 turns to the horizontal position and One side of the long semi-axis is in contact with the cement concrete specimen 7 and hits the cement concrete specimen 7 to move in the horizontal direction.

During use, first cement concrete test piece 5 is fixed, then adjust the distance between the cement concrete test piece 7 side of the joint material bottom and the elliptical loading plate 9, when making the elliptical loading plate 9 horizontal, the cement concrete test piece 7 Move 1cm to the right, set the speed of motor 8 to 17 rpm, start the motor, and the elliptical loading plate will start to realize the cycle of contact-separation-contact-separation with the test piece, so as to realize the cycle of loading-unloading-loading-unloading Vertical shear fatigue simulation process.

Claims (4)

1. a joint material vertical shear fatigue testing machine, is characterized in that, it is made up of cement concrete specimen fixture and loading device two parts; Described cement concrete specimen fixture is divided into upper and lower two parts, and the upper part It consists of a top plate (1), two vertically downward side plates (2) fixed to the top plate and a fixed cement concrete specimen (5). The lower part is composed of a guide plate (6) and can be horizontally The cement concrete specimen (7) slides in the same direction; the top plate (1) and the guide plate (6) are set horizontally, the top plate (1) is on the top, and the guide plate (6) is on the bottom; a round hole is reserved on the side plate (2). The screw (3) is connected with the nut (4) preset in the cement concrete specimen (5) through the round hole, and the cement concrete specimen (5) is embedded in the top plate (1) and the two side plates (2); The joint material (10) is filled between the bottom of the cement concrete test piece (5) and the top of the cement concrete test piece (7); The loading device is composed of a motor (8) and an elliptical loading disc (9); the driven wheel of the motor (8) is coaxially fixedly connected with the elliptical loading disc (9) at the focal point of the ellipse; the motor (8) The rotation drives the elliptical loading plate (9) to interlock through the chain. When the elliptical loading plate (9) turns to the horizontal position and one side of the long semi-axis contacts the cement concrete specimen (7) and hits the cement concrete specimen (7) along the Move horizontally. 2. The vertical shear fatigue testing machine for joint materials according to claim 1, characterized in that the distance between the two side plates (2) is 15-20cm. 3. The vertical shear fatigue testing machine for joint material according to claim 1, characterized in that, the nut (4) is a nut with one end closed. 4. The vertical shear fatigue testing machine for joint materials according to claim 1, characterized in that, the motor (8) can provide a rotational speed of not less than 17 revolutions/s for the elliptical loading plate (9).

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