HK1058692B - Method for building a track on a concrete slab - Google Patents

Description

The invention relates to a method of constructing a railway track on a concrete track slab with engravings intended to accommodate the railway tracks.

The process of building a railway track using a concrete track slab is known, and these processes are increasingly being used because they allow a very fast track slab construction rate. In such processes, the fresh concrete is usually continuously moulded by an automatic machine that follows the course of the track to be built, the machine having a sliding mold comprising two grooves saving engravings in the concrete slab. After the concrete has solidified, the rails are arranged in sections in the welds, engraved end to end, then manually calcified in height, one against the other by leaving a set of rigidities relative to the edges of the engravings.

This technique is fast for concrete laying but has the disadvantage of being slow for laying and timing rails and is therefore reserved for fairly short sections, such as level crossings.

Therefore, the present invention is intended to remedy this disadvantage by proposing a method of constructing a railway track on a concrete slab in which the placement of rails in engravings is greatly accelerated.

The object of the invention is a method of constructing a railway track on a concrete track slab containing engravings intended to accommodate the railway rails, characterized by the fact that, after the concrete forming the track slab has solidified, it comprises at least the following steps: (a) laying of rows of rails over the engravings on the track slab, the rails having a roller coated with a sheath of resilient material of such thickness that the roller coated with its sheath is slightly wider than the engraving;

Depending on the particular embodiments, the construction process of the invention may include one or more of the following characteristics taken individually or in all the combinations technically possible: (c) filling, by means of a resin, the free volume in the upper part of the engraving on both sides of the rail, the resin reinforcing the immobilization of the rail in the engraving prior to step (a), the rails of the same row are welded end to end; each engraving has, at least locally, a width decreasing from the bottom to the top of the engraving; the engravings have a trapezoidal section, the largest base of the trapezoidal section constituting the bottom of the engraving; the edges of the engraving are inclined at 3° 15° with respect to the plane perpendicular to the bottom of the engraving; the envelope is flat; the rails have a form complementary to the bottom of the engraving; the edges of the engraving are inclined at 3° 15° with respect to the plane perpendicular to the bottom of the engraving; the envelope is flat; the engraving has a shape complementary to the bottom of the engraving; the edges are inclined at a distance of several thousandths;A primer is placed on the edges of the engraving and on the sides of the rail in such a way as to facilitate the adhesion of the resin; the track slab is obtained by moulding a mass of fresh concrete continuously along a defined path.

The purposes, aspects and advantages of the present invention will be better understood by reference to the following description of a method of implementation of the invention, given as a non-limiting example, by reference to the attached drawings, in which: Figure 1 is a cross-sectional view of a track section schematically representing, at one of the rails, a stage in the construction process according to a particular embodiment of the invention; Figure 2 is a cross-sectional view of the track section produced by the process in Figure 1.

To facilitate the reading of the drawing, only the elements necessary for the understanding of the invention have been represented.

Figure 1 shows a detailed view of a concrete track 1 slab intended to accommodate one or more rows of 2 rail at the neck, the track 1 slab being fitted with an engraving 4 for each row of 2 rail, bounded by side edges 4a and a bottom 4b.

Err1:Expecting ',' delimiter: line 1 column 183 (char 182)

According to Figure 1, the cross-section of engravings 4 is trapezoidal in shape, the side edges 4a being slightly inclined, for example by 3° to 15°, with respect to the plane perpendicular to bottom 4b, the latter constituting the largest base of the trapezoid.

The 2 rails consist of a succession of end-to-end welded 2 rails which are known to contain, in themselves, a P-skid at the bottom, a core A with a surface opposite each other at the middle, and, at the top, a C-shell and a B-shell which delimit a G-choke for the wheel-chest of a railway vehicle.

In accordance with the invention, the P-skate of each rail 2 is coated with a coating 3 of a resilient material such as synthetic rubber, e.g. polyurethane, this coating 3 having a thickness suitable for the P-skate with its coating 3 to be slightly wider than the width of engraving 4 at bottom 4b. Such a coating 3 is advantageously obtained by moulding the resilient material around the P-skate of the rail 2, which can be done on site or preferably in the factory.

The construction process according to the invention will now be described by reference to Figure 1 which illustrates the stage of insertion of rail 2 into engraving 4, this being carried out after the concrete forming the track slab 1 has solidified.

In accordance with this figure, rail 2 is brought over engraving 4 by means of a portico, not shown, and rail 2 is gradually lowered over engraving 4 until the lower face of the envelope 3 covering the P-slide protrudes over the upper surface of the track slab 1.

A force is then applied locally and vertically from top to bottom, e.g. by means of a pressure wheel running on rail 2, to force the P-slide of rail 2 into engraving 4, the edges of the envelope 3 being then compressed against the lateral edges of engraving 4a by generating compressive forces represented by arrows in Figure 2. Due to the trapezoidal shape of engraving 4, the reaction forces of the lateral edges 4a on envelope 3 then tend to center rail 2 into engraving 4 and the resulting reaction forces present a vertical component oriented towards the rail that holds the 2a in the bottom of the engraving 4, thus achieving a 2a blockage in the first rail 4.

In accordance with Figure 2, after insertion, the free volume on both sides of rail 2 in the upper part of engraving 4 is filled with a resin 5 such as polyurethane, which adheres to the rails 2 and edges 4a of engraving 4, and the adhesion of the resin 5 can be strengthened by applying a preparation to the concrete edges of engraving 4 and the sides of rail 2.

This construction method has the advantage of allowing the rate of rail installation in engravings to be accelerated and thus of reducing the time of railway construction.

The invention is of course not limited to the method of implementation described and illustrated, which has been given only as an example.

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Claims (8)

1. A method of constructing a rail track on a track-receiving concrete slab (1) provided with channels (4) serving to receive the rails (2) of the rail track, said method being characterized in that, after the concrete forming the track-receiving slab (1) has set, it comprises at least the following steps:

   a) the stretches of rail (2) are put in place above the channels (4) in the track-receiving slab (1), each rail having a foot (P) coated with a casing (3) of resilient material whose thickness is such that the foot (P) as coated with its casing (3) is slightly wider than the channel (4);

   b) the foot (P) as coated with its casing (3) is inserted into the channel (4) by force, the shape of the channel (4) being suitable for reacting to the compression forces from the resilient material of the casing (3) with a reactive force tending to hold the rail (2) at the bottom of the channel (4); and

   c) the empty volume situated in the top portion of the channel (4) on either side of the rail (2) is filled with resin (5) which seals the installation.
2. A method of constructing a rail track according to claim 1, characterized in that, prior to step a), the rails (2) in each stretch are welded together end-to-end.
3. A method of constructing a rail track according to claim 1 or claim 2, characterized in that, at least locally, each channel (4) has a width that tapers going from the bottom (4b) to the top of the channel (4).
4. A method of constructing a rail track according to claim 3, characterized in that said channels (4) are of trapezium-shaped cross-section, the larger base of the trapezium constituting the bottom (4b) of the channel.
5. A method of constructing a rail track according to claim 4, characterized in that the edges (4a) of the channel are inclined at in the range 3° to 15° relative to the plane perpendicular to the bottom (4b) of the channel (4).
6. A method of constructing a rail track according to any one of claims 1 to 5, characterized in that the casing (3) coating the foot (P) of each of the rails (2) has a shape that has extra thickness of a few millimeters relative to the complementary shape of the channel (4).
7. A method of constructing a rail track according to any one of claims 1 to 6, characterized in that, prior to step c), a primer is deposited on the edges (4a) of the channel (4), and on the sides of the rail (2) so as to improve the adhesive keying of the resin (5).
8. A method of constructing a rail track according to any one of claims 1 to 7, characterized in that the track-receiving slab (1) is obtained by casting a mass of wet concrete continuously along a determined path.