FR2594153A1 - Device for installing rails of a railway track on a base plate and method for laying a railway track comprising the said device - Google Patents

Abstract

The subject of the invention is a device for installing a rail 16 of a railway track, characterised in that it consists of a moulded plastic cover 1, substantially inscribed in a rectangular parallelepiped comprising a single large face and four lateral faces, the said large face comprising a central zone 1A, on which the rail is fixed, and two lateral projections 1B, 1C, holes for the passage of a device for fastening the rail being made in the central zone, the cover comprising, on the opposite side to the rail, partitions 8, 9 which are perpendicular to the large face, the lateral projections acting as a stop-piece for taking up the shear forces exerted on the fastening devices 20, 21, 22. Application to railway tracks in particular for underground railways.

Description

Device for placing rails of a railroad on a slab and method of laying a railroad comprising said device.

 The invention relates to a device for installing the rails of a railroad track.

 An object of the invention is to produce a track without crosspieces, therefore placed directly on a raft, while retaining the conventional systems for attaching the tracks.

 Another object of the invention is to produce a track economically, the positioning adjustment of which is simple and rapid.

 Another object of the invention is to provide a path in which the forces exerted on the fastening devices are compensated so as to avoid the shearing of the fasteners.

 Another object of the invention is to provide a well electrically isolated track.

 The invention relates to a device for the establishment of a railroad track, characterized in that it consists of a molded plastic casing, substantially inscribed in a rectangular parallelepiped, comprising a single large face and four lateral faces, said large face comprising a central zone, on which the rail is fixed, and two lateral projections, holes for the passage of a rail fastening device being made in the central zone, the envelope comprising , on the side opposite to the rail, partitions perpendicular to the large face, the lateral projections serving as a stop for resumption of the shearing forces exerted on the fastening devices.

 The projections are shaped to match the shape of the attachment device used.

 The invention also relates to a method of laying a railroad track on a slab, characterized in that it comprises the following operations - the rails are placed in the position and the orientation that they will occupy definitively when the track is completed by means of a support installation provided with positioning and orientation adjustment means, rail positioning devices in accordance with the present invention are fixed from place to place under the rail by means of a system attachment, - formwork is available parallel to each rail on either side thereof and extending from the slab to at least the height of the central zone of the large face of the positioning device, - concrete is poured until it reaches the central zone of the large face of the positioning device according to the invention.

The invention is clarified by the description of a preferred embodiment of the invention, with reference to the accompanying drawing in which
Figure 1 is a partial cross-sectional view of a railroad track provided with a positioning device according to the invention.

- Figure 2 is a view along line II-II of Figure 1.

- Figure 3 is a view along line III-III of Figure 1.

- Figure 4 is a top view of the apparatus used for the implementation of the positioning device according to the invention.

- Figure 5 is a view along the line V-V of Figure 4.

 In Figure 1 is referenced 1 the rail positioning device according to the invention.

 This consists of a plastic envelope with a thickness between 2 and 5 millimeters.

 The material is preferably polyester.

 The envelope is substantially inscribed in a rectangular parallelepiped. The upper face has a central flat part 1A and two projections 1B and 1C of flat top, delimited by the large edges 3 and 4 of the envelope and by two portions 5B and 6C respectively parallel to the small edges 5 and 6 of the envelope .

 These projections define, above the plane of the plane part 1A, volumes 2B and 2C, the role of which will be explained below.

 The envelope 1 is stiffened by planar partitions such as the partitions 8 parallel to the large edges 3 and 4 of the envelope and the partitions 9 parallel to the small edges 5 and 6.

 The flat face 1A of the envelope is pierced with holes 10 and 11 for the passage of the rail fixing means. The projections are provided with small holes such as 12 opening into the grooves 13 extending to the small edge of the envelope; their role will appear below.

 The flat part 1A of 11 envelope receives an elastic sole (rubber) 15 on which the rail 16 is placed.

 The envelope 1 and the rail are secured by any known means.

 Here is shown a securing means constituted by a fastening system known under the brand STEFEF comprising a clip 20, a spring 21 and a threaded rod 22 in a nut 23.

 The device of the invention is used in the following manner, the rails being maintained above the raft in the position and at the place which they must permanently occupy, it is fixed from place to place, for example every 60 cm, on each rail a device according to the invention, by means of springs, toads and threaded rods.

 Concrete is then poured until the level reaches below the flat part 1A of the envelope.

 The air contained inside the envelope escapes through the holes 12 and the grooves 13.

 The projections 1B and 1C of the envelope are sufficient to take up the shearing forces exerted laterally.

 Amortization is amply provided by 11 assembly constituted by the support of the invention and the rubber sole.

 Once the concrete is poured and dry, no rail positioning adjustment is necessary since all the adjustments have been made before placing the concrete.

 As a result, the track laying process is particularly economical.

 The track is particularly well insulated thanks to the positioning device which cooperates with the sole and toads to move the rail away from the metal rods.

 Figures 4 and 5 illustrate the phase of setting up the rails and adjusting their positions and orientations.

 Although only one rail has been shown, it is clear that the two rails of the track are placed in position simultaneously, the drawings representing only half of the installation.

 From place to place (for example every 2 to 3 meters if the track is straight) a double plate 30-31 is used, held on one side by a plate 32 guiding a formwork 33 and resting on the other side on a tripod 34 height adjustable by screw 35 and swivel ball 36.

Screws 37, 38 secure the plate and the tripod.

 The rail 16 is fixed to the plate by toads 41, 42 and bolts 43, 44.

 A template 50 ensures the accuracy of the spacing of the rails and their inclination. This template is secured to the tripod by a set of metal parts 51 and 52 and bolts 53 and 54.

 The part 51 serves as a support for a formwork 56 on the inner side.

 A light 32A in the plate 32 and a clamping system 32B make it possible to adjust the position of the plate 30-31 on the side outside the track. On the inside, it is the operation of the screw 35 and the ball 36 of the tripod 34 which allows the positioning to be adjusted.

 Once the position of the rail has been determined, the formwork 33 is held in place by a double articulated arm 61; the formwork 56 is held by a double articulated arm 62 and a jack 63.

 The concrete is then poured onto the raft 100 as it was described previously and when it is dry, the installation is removed. The track is then finished without requiring additional adjustment.

 The invention applies in particular to the tracks of metropolitan railways.

Claims (4)

1 / Device for the establishment of a rail (16) of railway track, characterized in that it consists of a molded envelope (1) of plastic material, substantially inscribed in a rectangular parallelepiped having a single large face and four lateral faces, said large face comprising a central zone (1A), on which the rail is fixed, and two lateral projections (1B, 1C), holes for the passage of a rail fastening device being practical in the central zone, the envelope comprising, on the side opposite the rail, partitions perpendicular to the large face, the lateral projections serving as a stop for resumption of the shearing forces exerted on the fastening devices (20, 21, 22). 2 / Device according to claim 1, characterized in that the projections (1B, 1C) are shaped to match the shape of the fastening device (20, 21, 22) of the rail used. 3 / Device according to one of claims 1 and 2, characterized in that the projections are pierced with holes (12) opening into grooves (13) formed on the side of the device where the rail is fixed. 4 / A method of laying a rail track on a slab, characterized in that it comprises the following operations - the rails are placed in the position and the orientation which they will occupy definitively when the track is completed by means of a support installation provided with positioning and orientation adjustment means, rail positioning devices are fixed from place to place under the rail according to the present invention by means of a fastening system, has formwork parallel to each rail on either side of it and extending from the base to at least the height of the central zone of the large face of the positioning device, - concrete is poured up to that it arrives at the central zone of the large face of the positioning device according to the invention.