RU242593U1 - SLEEPERS' COVER - Google Patents

Abstract

Sleeper pads are used in transport engineering and are designed for the construction of railroad crossings at their intersections with roads and pedestrian crossings. They are designed to prevent rigid contact between the reinforced concrete base of a rubber-reinforced concrete slab and the reinforced concrete surface of railroad ties when vehicles pass over the crossing. The sleeper pad is designed to align the profile of the middle section of reinforced concrete ties and has a trapezoidal shape that completely matches the profile of the middle section of a reinforced concrete tie. To prevent displacement and ensure a tight fit to the ties, the pad's edges are provided with flanges, and cylindrical recesses are made in the body of the pad to impart elasticity and reduce weight. 7 ill.

Description

The utility model relates to the field of transport construction and is intended for the construction of railway crossings at the points of their intersection with roads and pedestrian crossings and is intended to prevent rigid contact between the reinforced concrete base of a rubber-reinforced concrete slab and the reinforced concrete surface of railway sleepers when vehicles pass over a railway crossing.

A pedestrian crossing deck over a rail track is known (RU Patent for Utility Model No. 176621, class E01C 9/04), which is additionally equipped with pads that repeat the shape of the sleepers, installed between the sleepers and slabs, and bars installed in open channels of the internal slabs parallel to the axis of the track, while both the pads and bars are made of a rubber mixture with a fibrous filler.

The disadvantage of this design is the technical complexity of manufacturing such slabs and laying the internal deck slabs on the sleepers.

A rubber-cord pavement for railroad crossings (Project 2741.000 according to TU 32 CP 828-97) is known. It contains an internal liner, which serves as a base for the internal rubber-cord plate. The liner is manufactured strictly according to the dimensions specified in the design documentation and must be laid exactly in the middle of adjacent sleepers, the distance between which along the axes must always correspond to the width of the liner (Fig. 1a, 1b). If this does not correspond, the liner (1) and the internal plate (2) lying on it will collapse between the sleepers, damaging the railroad crossing pavement and preventing vehicle passage.

A known prototype is a sleeper damping pad, designed as a U-shaped elastic plate. The plate's upper surface contacts the supporting surface of a reinforced concrete slab. The plate's lower surface contacts the inclined supporting surface of the sleeper. To ensure uniform seating of the reinforced concrete slab, the distance between the pad's lateral projections gradually decreases from one side to the other. (Russian Federation Patent for Invention No. 2785146, cl. E01B 21/00, E01C 9/06).

The disadvantage of this design is that the shape and dimensions of the elastic pad ensure that the pad is fixed on the inclined support surface of the middle part of the sleeper and cannot ensure a uniform load on the sleepers from vehicles passing over the railway crossing.

The proposed utility model allows for a technical result that extends the service life of the crossing by ensuring uniform distribution of loads on the sleepers from vehicles passing over the railroad crossing. The NBSh sleeper cover plate aligns the sleeper's internal profile, making it horizontal, similar to the underside of the crossing's rubber-reinforced concrete pavement slab, while the rubber material absorbs impacts from passing vehicles. The use of the NBSh sleeper cover plate reduces the labor intensity of the entire structure's installation, increases its reliability, and reduces costs due to the design solutions employed.

The technical result is achieved by the NBSh sleeper cover plate (3) being trapezoidal in shape (Fig. 2) and perfectly matching the profile of the middle section of the reinforced concrete sleeper. To prevent displacement and ensure a tight fit to the sleepers, 16 mm high flanges (4) are located along the edges of the cover plate. This height is sufficient to prevent the cover plate from slipping off the sleeper during installation of the slab, which securely clamps it.

To provide elasticity and reduce weight, the NBSh sleeper cap is equipped with special cylindrical recesses (5) with a diameter of 48 mm. The optimal number of recesses, ensuring the specified physical and mechanical parameters of the crossing structure, is 18 (Fig. 2), arranged in two rows symmetrical to the cap axis, with nine recesses in each row. The diameter of the recesses is 48 mm. These recesses allow for savings in raw materials and reduce the cost of the cap.

The NBSh sleeper pad is designed to level the midsection of reinforced concrete sleepers: Ш1, Ш2, Ш3, III-МБ, and others. It is made of rubber or polymer materials. It is installed on top of the inner portion of the sleeper and is designed to prevent hard contact between the reinforced concrete base of the rubber-reinforced concrete slab and the reinforced concrete surface of the railroad ties when vehicles pass over the crossing.

The NBS sleeper cover plate is installed over the inner portion of a reinforced concrete sleeper, as shown in Figs. 3a and 3b. The NBS dimensions correspond to the sleeper dimensions, so their installation is straightforward.

The NBS sleeper pads serve for the entire service life of the crossing and do not require special maintenance or replacement.

The NBSh sleeper pad is not tied to strict inter-sleeper spacing. Each pad is individually installed only on the concrete sleeper itself, not in the space between sleepers. The rubber-reinforced concrete slabs are designed for high strength and are 3250 mm long. When installing internal rubber-reinforced concrete slabs on concrete sleepers with NBSh sleeper pads, the load from passing vehicles is evenly distributed along the entire length of the slab, unlike rubber-cord slabs, which are 546 mm long and strictly adhere to the sleeper placement pattern.

The technical essence of the claimed utility model is explained by the following figures:

Fig. 1a - photo of the internal lining for railway crossings (Project 2741.000)

Fig. 1b - diagram of laying the internal lining on the railway track (Project 2741.000)

Fig. 2 - shows the structural elements of the sleeper overlay NBSh;

Fig. 2a - photo of the sleeper overlay NBSh, side view;

Fig. 2b - photo of the sleeper overlay NBSh, view from below;

Fig. 3a - diagram of the location of the sleeper overlay NBSh on the railway track;

Fig. 3b - diagram of the location of the sleeper overlay NBSh at a railway crossing.

Claims (1)

A sleeper pad made from a rubber mixture, comprising an upper support surface in contact with the support surface of a rubber-reinforced concrete slab, and a lower surface in contact with the surface of a reinforced concrete sleeper, characterized in that it has a trapezoidal shape that completely corresponds to the profile of the middle part of the reinforced concrete sleeper, with 16 mm high flanges along the edges and cylindrical recesses arranged in two rows symmetrical relative to the axis of the pad, with 9 recesses in each row with a diameter of 48 mm.