CN103498391B - Section rod friction type stepless automatic height-adjustment sleeper - Google Patents

Abstract

A joint rod friction type stepless automatic height-adjusting sleeper is a concrete sleeper installed on the transition section of the railway line. The rod contains more than 2 sections of one-way inverted cone. The friction section rod is welded with the pre-set stress steel bars inside the sleeper. After pouring concrete, it is connected with the sleeper. The friction section rod is buried in the ballast. Forging or casting. The joint rod friction type stepless automatic height adjustment sleeper of the present invention has the characteristics of simple structure, automatic adjustment, reliable operation, etc., and can be used on ballasted track bed in the transition section of different track structures to solve the problem of unevenness caused by uneven settlement of the track .

Description

Joint rod friction type stepless automatic height adjustment sleeper

technical field

The invention relates to a joint bar friction type stepless automatic height adjustment sleeper.

Background technique

The railway line structure is composed of lines (subgrade lines), bridges, tunnels, and stations. The track structure of the line can be laid with ballasted tracks and ballastless tracks according to the differences in railway grades and technical standards. The stiffness of different line structures is significantly different, causing the displacement response of the rail surface to be inconsistent when the train passes. At the same time, the foundation settlement of different structures is not uniform, and deformation is easily generated near the transition point, resulting in bending of the rail surface. When the train passes by at high speed, the dynamic interaction between the vehicle and the line is intensified, causing serious irregularities on the track surface, accelerating the deterioration of the line state, increasing the maintenance cost of the line, and even threatening the driving safety in severe cases.

In order to reduce the sudden change in line stiffness between different line structures, it is necessary to set transition sections at the junctions between ballastless track and ballasted track, subgrade and bridge culvert, subgrade and tunnel, and embankment and cutting, so as to realize the change of line stiffness within the transition section. Gradient transition. The commonly used processing methods for the transition section are: 1. Increase the vertical stiffness of the track on the softer side of the transition section. Reducing the sleeper spacing allows for a gradual transition in track stiffness. 2. Reduce the vertical stiffness of the track on the harder side of the transition section. Generally, a softer rubber pad is used under the track; a high-elastic rubber pad is placed under the pillow; the thickness of the ballast on the bridge is increased, and the road is paved Ballast mat, etc. 3. Set auxiliary rails to improve the rigidity of the track structure frame. The auxiliary rails are composed of four steel rails attached to the sleepers, two of which are between the running rails and two of which are outside the running rails. The above method has a good effect on reducing the stiffness change rate between different track structures, but it cannot solve the problem of rail surface bending caused by the settlement difference between different structures, so it has certain limitations and cannot completely solve the problem of unevenness in the transition section .

Contents of the invention

The object of the present invention is to provide a friction-type stepless automatic height-adjusting sleeper with a simple structure and reliable operation, which can be used on the ballasted track bed in the transition section of different track structures and solve the problem of unevenness caused by uneven settlement of the track.

The joint rod friction type stepless automatic height-adjusting sleeper of the present invention is a concrete sleeper installed on the transition section of the railway line. The section bar contains more than two one-way inverted cones. The friction section bar is welded to the preset stress steel bars inside the sleeper. After pouring concrete, it is integrated with the sleeper. The friction section bar is buried in the ballast. The material is ordinary low carbon steel. Can be die forged or cast.

The joint bar friction type stepless automatic height adjustment sleeper of the present invention utilizes the principle that the one-way inverted cone of the friction joint bar joint can form one-way support and frictional resistance in the ballast, and automatically adjusts the height through the triggering action of the elastic restoring force of the rail , to compensate for the suspended amount of the sleeper. The specific working principle is as follows: the sleeper is laid according to the ordinary process, the sleeper is supported on the ballast, and the friction joint rod is squeezed in the tamped ballast. When the train wheels pass by, the force generated by the wheels on the rails is transmitted to the ballast bed through the sleepers, friction joint bars and ballast. If the ballast bed settles, the rails will produce elastic bending deformation downward. When the train wheels leave, the elastic deformation of the rail recovers, producing a large upward elastic force, and the rail drives the sleeper to move upward, making the sleeper suspended in the air. Since the sleeper and the friction joint rod are integrated, the friction joint rod with multi-segment one-way inverted cones twitches upwards from the ballast, which just compensates for the settlement of the ballast bed. When the train wheels pass by again, due to the randomness of the size of the ballast in each direction and the extrusion of the ballast, an upward support force and friction resistance will be generated on the one-way inverted cone of the friction section bar, and each friction section bar has multiple The one-way inverted cone structure increases the supporting area and frictional force, which is enough to support the force from the rail, that is, the height of the sleeper remains unchanged. At this time, the force generated by the wheel on the rail passes through the sleeper, friction joint rod And the ballast is passed to the road bed. If the ballast bed has no settlement at this time, the sleeper height remains unchanged; if the ballast bed has subsidence at this time, repeat the above adjustment process again.

The joint bar friction type stepless automatic height adjustment sleeper of the present invention has the characteristics of simple structure, automatic adjustment, reliable operation, etc., and can be used on ballasted track bed in the transition section of different track structures to solve the problem of unevenness caused by uneven settlement of the track .

Description of drawings

Fig. 1 is a structural representation of the present invention;

FIG. 2 is a schematic diagram of the side structure of FIG. 1 .

Detailed ways

A joint rod friction type stepless automatic height-adjusting sleeper is characterized in that the bottom surface of the first section of the rail on which the sleeper 2 is installed is provided with evenly distributed friction joint rods 4, and the friction joint rods 4 contain more than two one-way inverted cones, The friction joint bar 4 is welded with the pre-set stress steel bars inside the sleeper 2, and is connected with the sleeper 2 after pouring concrete. The friction joint bar 4 is buried in the ballast 3. The vertical and horizontal center distance of the friction joint bar 4 is 80-120mm. When the sleeper is laid, the 20-70mm ballast is beneficial to enter between the friction joint bars 4, and the tamping of the ballast is not affected.

Claims (1)

1. the stepless automatic adjustment height sleeper of pole friction-type, it is characterized in that: the bottom surface of sleeper (2) being installed rail (1) section is provided with equally distributed friction pole (4), friction pole (4) is containing unidirectional back tapers more than 2 joints, the stress reinforcement welding that friction pole (4) is inner preset with sleeper (2), be linked into one with sleeper (2) after concreting, friction pole (4) is embedded in railway ballast (3).