Classifications

• • E—FIXED CONSTRUCTIONS
  • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
  • E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
  • E01B3/00—Transverse or longitudinal sleepers; Other means resting directly on the ballastway for supporting rails
  • E01B3/28—Transverse or longitudinal sleepers; Other means resting directly on the ballastway for supporting rails made from concrete or from natural or artificial stone
  • E01B3/40—Slabs; Blocks; Pot sleepers; Fastening tie-rods to them
• • E—FIXED CONSTRUCTIONS
  • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
  • E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
  • E01B1/00—Ballastway; Other means for supporting the sleepers or the track; Drainage of the ballastway
  • E01B1/002—Ballastless track, e.g. concrete slab trackway, or with asphalt layers
  • E01B1/005—Ballastless track, e.g. concrete slab trackway, or with asphalt layers with sleeper shoes

Definitions

• the present invention relates to a rail support for a track on a slab, that is to say without ballast. Such routes are used in particular in tunnels.
• a rail support is composed of a concrete block or block, the upper part of which is provided with means for fixing the rail.
• the shape of the lower part of the concrete block is, in turn, designed to adapt to the shape of an elastomer shell also called a liner.
• an elastomer sole whose surface is substantially equal to the surface of the underside of the block. This sole has an elasticity adapted to the nature of the traffic on the line to attenuate the vibrations emitted during the passage of a train and to give the track flexibility in compression in the vertical direction. Such flexibility can also be obtained by means of reliefs of the fluting type, present on the bottom of the envelope.
• the installation of this system is carried out in different successive phases: the first phase is the phase of fixing the rail on the support on the one hand and the embedding of the envelope on the support on the other hand.
• the second phase is the positioning phase of the assembly formed by the rail, the support and the envelope to obtain the desired track layout.
• the third phase is the sealing phase of the track by concreting which definitively freezes the position of the track.
• the external dimensions of the concrete blocks can vary significantly from one block to another, in particular because of the shrinkage phenomenon which occurs when the concrete dries and hardens. This variation is problematic when one wishes to replace a defective or damaged support, following a derailment for example, by another support. Indeed, it may be that in this case the dimensions of the new support do not allow to correctly enter the imprint left in the cavity of the slab by the old support.
• the second reason, of an economic nature, is that the concrete supports have a weight such that transport over long distances presents a handicap in terms of cost of transport; a palliative would be to manufacture the supports near the place of laying of the track but that supposes a transfer of know-how and material whose cost is not always compatible with the considered site, in particular when it is a question of the construction of metro lines, due to the size of the site, or that of a railway line in an under-equipped country.
• the object of the present invention is to remedy the shortcomings of the existing solutions mentioned above.
• a rail rail support for track on a slab comprising a block of molded material, the upper part of which is provided with means for fixing the rail, encased in a liner envelope comprising a wall vertical and a bottom, said envelope being itself housed in a cavity of said slab, characterized in that said block is molded in a rigid shell whose shape and external dimensions are adapted to the internal dimensions of the envelope, the face bottom of the assembly constituted by the block and the rigid shell, forming a block, resting on the bottom of said liner.
• the block thus formed can rest directly on the bottom of the liner, possibly with the interposition of a relatively flexible sole, if necessary. This guarantees the possibility of replacing the block by simple substitution.
• one or more reinforcement grids are secured to the rigid shell and embedded in the block of molded material. This avoids the separation of these last two elements in the event of a phenomenon of shrinkage of the molded material during drying.
• the rail support according to a preferred embodiment of the invention is such that the horizontal section of the external contour of the rigid shell has a curvilinear shape, for example circular.
• the shell is advantageously cut from a tube with a circular section, metallic, preferably made of steel.
• FIG. 1 shows a cross section of the rail support according to the invention; according to line I-I of Figure 2; Figure 2 shows a top view of such a support; Figure 3 is an exploded perspective view of certain parts of a rail support according to a second embodiment according to the invention; Figure 4 is a sectional view of this second embodiment; and FIG. 5 illustrates another variant, seen from above.
• the support as shown comprises a block of molded material 1, concrete in the example described, the upper part of which is provided with fixing means 2 for the rail 7.
• fixing means comprise a lag screw 3 with external thread intended for to be fixed by screwing in a female element, a kind of dowel 4 with internal thread, a spring blade 5 in steel and a band 6 in elastomer having longitudinal grooves to allow flexibility in compression during the passage of the train.
• the lower part of the rail 7 is held between the upper part of the dowel 4 and the elastomer strip 6 by clamping the male element 3 in the female element 4.
• the leaf spring 5 serves to transmitting the clamping force on the heel 13 of the rail 7, while distributing the force over a certain surface.
• This support is embedded in an envelope 8, itself housed in a cavity of the slab 9.
• the bottom 8a of the envelope 8 has radial grooves 14 intended to provide flexibility in compression to the envelope to attenuate the vibrations emitted when passing a train.
• the block of molded material 1 is surrounded by a rigid shell 10, a sort of lost mold in which the molding of said block has taken place.
• the assembly forms a block which it may be necessary to change in the event of deterioration of the track.
• the block rests on the bottom of the slipper.
• a reinforcement grid 11, integral with the rigid shell 8 is embedded in the block of molded material 1.
• the end of the rigid shell 10 has a chamfer 12 facilitating its embedding in the envelope 8.
• the horizontal section of the outer contour of the rigid shell shown in Figure 2 is circular and obtained by cutting to length a metal tube, preferably steel.
• a non-circular curvilinear section could however be suitable.
• the upper end of said rigid shell 10 advantageously has two diametrically opposite indentations allowing the passage of the rail 7.
• FIGS. 3 and 4 the structural elements similar to those of the embodiment of FIGS. 1 and 2 bear the same reference numbers and will not be described in detail again.
• the shape and the external dimensions of the rigid shell 10 are adapted to the internal dimensions of the casing 8 and the underside of the assembly constituted by the concrete block and the rigid shell rest on the bottom. 8b of envelope 8.
• the bottom 8b is provided with studs 20 coming from molding, which play the same role as the splines 14.
• the number and the dimensions of these studs can be adapted as a function of the elasticity which it is desired to give to the bottom of the liner, on which the assembly forming the block rests, constituted by the concrete block 1 and the rigid shell 10.
• the envelope itself is conventionally made of synthetic material, for example elastomer or the like, as in the case of the previous embodiment.
• the generally cylindrical vertical wall 22 has vertical ribs 24 chamfered at their upper ends, which facilitates the introduction and sliding of the rigid shell 10.
• the edge of the envelope 8 forming a liner comprises a ring 26 shaped to receive a clamp 28.
• This ring is connected to the rest of the vertical wall by a thinned annular part 30.
• the ring 26 is provided externally with segments 32 offset axially and circumferentially and defining between them the housing of the clamp 28. The latter makes it possible to ensure the seal between the cylindrical outer wall of the rigid shell 10 and the liner, preventing water infiltration between these two elements. If, following an incident, it is necessary to replace the block, simply disassemble the collar and extract the block vertically by sliding it into the liner.
• the rigid shell 8 is made of molded plastic.
• Clipping means 36 have come from molding with the rigid shell 10 and bottom protruding inside thereof. The ends of a reinforcement grid 11 can engage in these clipping means, which allows immediate installation of said grid (no welding is necessary as in the previous example) before pouring the concrete into said rigid shell forming a lost mold.
• the liner 8 shown in FIG. 3 can perfectly receive a rigid metallic shell like that described with reference to FIGS. 1 and 2.
• the rigid shell 10 and the liner 8 are generally cylindrical with a circular section.
• a non-circular curvilinear section is possible, preferably in any parallelepiped shape, to ensure a better distribution of the stresses on the envelope.
• the simple and advantageous shapes one can choose an oval shape.
• the horizontal sections of the rigid shell 10 and the liner 8 have an oval outline, the largest dimension of the support extending substantially perpendicular to the rail. This advantageous form is illustrated in FIG. 5.
• its transverse dimension is significantly greater than its height. In practice, the transverse dimension will be at least about twice the height.

Landscapes

• Engineering & Computer Science (AREA)
• Architecture (AREA)
• Civil Engineering (AREA)
• Structural Engineering (AREA)
• Machines For Laying And Maintaining Railways (AREA)
• Railway Tracks (AREA)
• Train Traffic Observation, Control, And Security (AREA)
• Magnetic Heads (AREA)
• Buildings Adapted To Withstand Abnormal External Influences (AREA)
• Road Paving Structures (AREA)
• Forms Removed On Construction Sites Or Auxiliary Members Thereof (AREA)
• Non-Portable Lighting Devices Or Systems Thereof (AREA)

Applications Claiming Priority (3)

Publications (2)

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ID=32039745

Family Applications (1)

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• 2002
  • 2002-10-15 FR FR0212804A patent/FR2845700B1/fr not_active Expired - Fee Related
• 2003
  • 2003-10-15 ES ES03775485T patent/ES2333713T3/es not_active Expired - Lifetime
  • 2003-10-15 WO PCT/FR2003/003032 patent/WO2004035934A1/fr not_active Ceased
  • 2003-10-15 DE DE60329315T patent/DE60329315D1/de not_active Expired - Lifetime
  • 2003-10-15 AU AU2003283511A patent/AU2003283511A1/en not_active Abandoned
  • 2003-10-15 AT AT03775485T patent/ATE443182T1/de active
  • 2003-10-15 EP EP03775485A patent/EP1560984B1/de not_active Expired - Lifetime

Non-Patent Citations (1)

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