CN203259455U - Indoor test apparatus of friction coefficient of pavement structural layer - Google Patents

Abstract

The utility model relates to an indoor test device for the friction coefficient of a pavement structure layer. The test device comprises a movable frame (1), a sliding rail (2), a sliding wheel (3) and a friction plate (4). The sliding rail (2) is fixedly connected to the movable frame (1) by welding, the sliding wheel (3) can slide freely along the sliding rail (2), and the friction plate (4) is installed on the sliding wheel (3). The sliding wheel (3) rubs against the road surface and rotates during the sliding process, reaching the slot (5) of the sliding rail (2) and being fixed by the sliding rail. The friction coefficient of the road surface is reflected by the rotation time of the sliding wheel (3). The device is simple in structure and easy to use, and can simulate the friction coefficient of the road surface at different speeds through the release height of the sliding wheel, and establish a good correlation with the friction coefficient of the existing road surface.

Description

An indoor test device for friction coefficient of pavement structural layer

technical field

The utility model belongs to the field of road engineering, and relates to an indoor measuring device for the friction coefficient of pavement structural layers, which can be widely used in measuring the friction coefficient in road engineering.

Background technique

Road transportation has the characteristics of fast, safe, efficient and convenient, and has become an extremely important part of land transportation. Due to the increase in traffic volume and the increase in the speed of various vehicles on the road, the problem of driving safety is particularly prominent. The quality of the road surface has a great impact on traffic safety, especially the parameter that characterizes the anti-skid performance of the road surface—the friction coefficient of the road surface. Factors affecting the friction coefficient of road surface include: (1) tire and road surface roughness; (2) road surface water; (3) contact pressure of tire road surface. In order to ensure the traffic capacity and safety of the expressway, the friction coefficient of the newly built road surface should be measured, and the friction coefficient test should be carried out regularly on the completed road to monitor the change of the road surface friction coefficient to ensure the service quality of the road surface.

The current friction coefficient measurement methods mainly include the following: (1) pendulum friction coefficient tester, according to energy conservation, the potential energy loss of the swing arm is converted into the work done by the friction force of the road surface, and then the friction coefficient is calculated inversely and passed through the pendulum type This method is easy to operate, but it can only measure the friction coefficient of a single point on the road surface at a certain speed; (2) the braking force coefficient, calculate the corresponding friction coefficient by measuring the braking force of the test wheel, the main application and The longitudinal friction coefficient of the road surface is more in line with the braking situation; (3) the lateral force coefficient, currently the most widely used is the scrim system. The SFC value of the road surface is measured by a test wheel with a 20-degree deflection angle, which can reflect both vertical and horizontal directions. However, due to the huge equipment and poor maneuverability, it is mainly used to continuously collect the friction coefficient of the road surface on site.

To sum up, the current method for measuring pavement friction coefficient requires high equipment, complicated operation, and poor reproducibility of measurement results. In addition, due to the poor maneuverability of large-scale equipment, it is difficult to meet the needs of indoor simulation tests.

Contents of the invention

The technical problem to be solved by the utility model is to provide an indoor measuring device for the friction coefficient of the road surface structure layer. The device is simple in structure and easy to use, and can simulate the friction coefficient of the road surface at different speeds through the release height of the sliding wheel.

The technical scheme of the present utility model: an indoor test device for the friction coefficient of the pavement structure layer, which includes: a movable frame 1, a slide rail 2, a sliding wheel 3 and a friction plate 4, and two connecting shafts are arranged in parallel on the movable frame 1 5 connected semi-circular arc-shaped slide rail 2, one end of the slide rail 2 is also provided with a card slot 8, and a sliding wheel 3 sliding along the slide rail 2 is provided on its connecting shaft 5, and the inside of the sliding wheel 3 is provided with a free The rotating bearing 6 and the friction plates 4 are evenly distributed on the surface of the sliding wheel 3 .

Further, four corner posts 7 are respectively arranged under the edges of the front and rear sides of the movable frame 1, the two corner posts on the front side are respectively connected to the steerable wheels 9, and the two corner posts on the rear side are respectively connected to the ordinary wheels 10 .

Further, the slide rail 2 is welded to the movable frame 1, and the slide rail 2 is composed of four rail pieces, two pieces in each of the upper and lower layers.

Beneficial effects of the utility model: the device is simple in structure and easy to use, and can simulate the friction coefficient of the road surface at different speeds through the release height of the sliding wheel, and establish a good correlation with the friction coefficient of the existing road surface.

Description of drawings

Fig. 1 is the structural representation of the utility model;

Fig. 2 is the right side view of the utility model structure.

Detailed ways

An indoor test device for the friction coefficient of pavement structure layers, which includes: a movable frame 1, a slide rail 2, a sliding wheel 3 and a friction plate 4, and two semicircular arc-shaped slides connected by a connecting shaft 5 are arranged in parallel on the movable frame 1. Rail 2, one end of the slide rail 2 is also provided with a card slot 8, and a sliding wheel 3 sliding along the slide rail 2 is arranged on its connecting shaft 5, and a freely rotating bearing 6 is arranged inside the sliding wheel 3, and the friction plate 4 evenly distributed on the surface of the sliding wheel 3. Four corner posts 7 are respectively arranged under the front and rear sides of the movable frame 1 , the two front corner posts are respectively connected with steerable wheels 9 , and the rear two corner posts are respectively connected with ordinary wheels 10 . The slide rail 2 is welded with the movable frame 1, and the slide rail 2 is composed of 4 rail pieces, two pieces in each of the upper and lower layers.

Claims (3)

1. An indoor test device for friction coefficient of pavement structure layer, which includes: movable frame (1), slide rail (2), sliding wheel (3) and friction plate (4), characterized in that: movable frame (1 ) are arranged in parallel with two semicircular arc-shaped sliding rails (2) connected by the connecting shaft (5), and one end of the sliding rail (2) is also provided with a card slot (8), and the connecting shaft (5) is provided with a A sliding wheel (3) sliding along the sliding rail (2), the sliding wheel (3) is provided with a freely rotating bearing (6) inside, and the friction plates (4) are evenly distributed on the surface of the sliding wheel (3). 2. The indoor testing device for the coefficient of friction of pavement structural layers according to claim 1, characterized in that four corner columns (7) are respectively arranged under the edges of the front and rear sides of the movable frame (1), and the front side The 2 corner posts are respectively connected with the steerable wheels (9), and the 2 corner posts on the rear side are respectively connected with the ordinary wheels (10). 3. The indoor test device for the coefficient of friction of pavement structural layers according to claim 1 or 2, characterized in that: the slide rail (2) is welded to the movable frame (1), and the slide rail (2) It consists of 4 rail pieces, two on the upper and lower floors.

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