DK2351884T3 - Module support for a pre-fabricated railway track, railway track, profile and method for mounting railway tracks - Google Patents

Description

Description

The present invention relates to a prefabricated module for supporting a railway track, a railway track comprising such modules, a prefabricated railway track section as well as a method for mounting such a railway track. It has applications in the field of civil engineering and more particularly for the construction of railway tracks grass-seeded at the surface, in particular for urban tramway networks.

There is currently renewed interest for urban tramway networks in urban spaces. However, these require more extensive infrastructure than other lighter systems like trolleybuses as a specific railway track has to be built, on which they can run (FR 2 901 814 A1 or EP 1 736 599 A1). In such urban environments an existing bare railway track, although it does not require very frequent maintenance, is not always appreciated from an aesthetic point of view. Therefore, this has led to masking the railway tracks by grass-seeding on the surface. Now, the methods used for building such railway tracks involve concrete slabs made under the track, which results in height partitioning of the railway track, and the upper part of the track, which is seeded with grass, is isolated from the natural or prepared soil on which the railway track rests. It is then necessary to provide for means of evacuation of water, in particular rainwater or sprinkling water, in the form of draining means suitable to prevent water stagnation. Furthermore, on account of the low height available on the railway track for grass seeding, the amount of substrate for grass growing is relatively small. Grass maintenance is therefore rather complex, especially to obtain a sufficient and stable humidity level over time in the substrate. The consequence is a higher risk of grass being subjected to environmental stresses likely to ruin it.

One object of the present invention, among others, is to propose a means for constructing a railway track which, in the case of grass being seeded on the surface, provides more natural conditions for grass growth while preventing height partitioning of said railway track and allowing the surface grass seeded substrate to come into contact with the soil beneath the railway track. Other objects and advantages will be described hereinafter.

So, the invention relates to a module for supporting a railway track, wherein the module includes, laterally with respect to the central axis of the track, two support elements for the two rails of the track and, in the transverse space between the two support elements, a transverse connection means connecting them, the support element being meant to receive a sleeper of reinforced concrete including threaded rods and on which anchoring saddles, supporting the rail by bolting of pads on the threaded rods that pass vertically through the saddles, are laid, said module allowing grass seeding on the surface of the railway track. According to the invention, the module is made of prefabricated single-piece reinforced concrete, and each support element is a bucket having the shape of a channel open upwardly and laterally at its two axial ends along the axis of the track rail, and the transverse connection means includes at least two jambs separated axially and extending between the two buckets so that the transverse space includes at least one opening for communication between the two volumes defined above and beneath said module, and the bases (= lower faces of the two buckets and of the jambs) of the two buckets and of the jambs of the module are in the same plane, and the two axial end faces of the two buckets at the same axial end of the module are vertical and in the same plane so that, when the modules are joined together and aligned, there is no substantial discontinuity between the lateral internal faces of the aligned bucket channels.

In various embodiments of the invention, the following means that can be used either alone or in any technically feasible combinations, are employed : - the railway track is a tramway track, - the module is symmetric with respect to the axial plane (track axis) - the module is symmetric with respect to the transverse plane, - a jamb extends between the two buckets at each of the two axial ends of the module so that the transverse connection means includes an opening in its middle part for communication between the two volumes defined above and beneath said module, - the axial end edge of the axial end jamb of the module is in the same plane as the two axial faces of the two buckets of the same axial end of the module so that, when the modules are joined together, there is no substantial discontinuity between the axial end edges of the two joined jambs, in other words: the end jambs are in contact with each other between two adjacent modules, - the axial end edge of the axial end jamb of the module is recessed relative to the plane passing through the two axial faces of the two buckets of the same axial end of the module so that, when the modules are joined together, there is a substantial discontinuity between the axial end edges of two adjacent jambs and hence a communication between the volumes defined above and beneath said joined modules, in other words : the end jambs are not in contact with each other between two joined modules, - the two lateral inner faces of the bucket channel are inclined according to a dovetail shape, the bottom of the bucket channel being wider than the upward upper opening of the bucket channel, - the two lateral outer faces of the bucket are vertical, the bucket having a substantially parallelepipeds external shape, - the two lateral outer faces of the bucket are inclined, the base of the bucket being wider than the upper apex of the bucket, the bucket having a substantially truncated pyramidal external shape in cross section, - the thickness of the bucket channel side walls is substantially constant over its height, - the bucket height is higher than the jamb height, - the bucket height is equal to the jamb height, - the module comprises gripping means for handling by a lifting device, - the gripping means is an aperture in the module, - the gripping means is a concrete iron loop protruding from a wall of the module, - the gripping means is a specific gripping device, - the sleeper is produced either by casting fluid concrete into the totality of the bucket channel, or by inserting stop blocks in the bucket channels for the support and fastening of rails, said stop blocks being held in said channels by a locking concrete, - the stop block has a substantially truncated pyramidal shape in cross section, - the communication surface accounts for 50% to 90% of the total surface of the transverse space between the two buckets.

The invention also relates to a two-rail track, grass-seeded on the surface, such that it includes a set of modules according to one or several of the characteristics described herein, said modules being joined together and aligned with each other, each rail being laid and fixed onto and within a reinforced concrete sleeper obtained by casting concrete into the aligned channels of the corresponding buckets, said modules being laid on a prepared ground and a grass-seeded re-vegetatable composition being spread over the track.

In potentially combined alternatives the railway track is such that: - the revegetatable composition is in contact with the soil through the openings of modules between jambs, - the revegetatable composition is in contact with the soil through a filling layer, - the revegetatable composition is in contact with the soil through a geotextile. The invention also relates to a prefabricated two-rail track section of a given length, such that it includes a set of modules according to one or several of the characteristics described herein, said modules being aligned with each other and joined together, two sleepers of reinforced concrete, made by casting concrete into the aligned channels of the buckets, said sleepers further including threaded rods, anchoring saddles and pads disposed on the sleepers, the rails being placed on the saddles and held by bolting the pads on the threaded rods. The invention also relates to a method for mounting a two-rail track, grass-seeded on the surface such that: - a soil is prepared to obtain a load-bearing surface, - disposed on the prepared soil is a side-by-side alignment of modules according to one or several of the characteristics described herein, - a reinforcement is installed in the bucket channels of the modules, - threaded rods, saddles, pads and rails are installed, - rails are positioned along the aligned channels of buckets, - fluid concrete is casted into the bucket channels of the modules so as to produce the sleepers arranged in the buckets and holding the threaded rods.

In potentially combined alternatives the method is such that: - a track alignment template is used for arranging modules on the soil, - a track gauge template is used for the installation and positioning of rails, - the template is a rigid device, - the template is an optical means (laser beam, optical surveying instrument, ....), - the template is a mechanical positioning device, - soil preparation consists in obtaining a load-bearing surface having specified flatness and load-bearing properties, - soil preparation consists in obtaining a load-bearing surface having specified draining properties, by example by using appropriate materials and/or equipment.

The use of prefabricated modules for forming load-bearing sleepers for the railway permits contacts between earth (the soil on which the railway reposes) and earth (the grass-seeded substrate on the surface) to be maintained between each rail and each track for a lighter structure and better durability of the grass planted on a substrate receiving hygrometric exchanges. Besides, among the advantages of using prefabricated modules, other than those in connection with the benefits derived for grass growth and maintenance on a grass-seeded railway track, the following advantages are described hereafter by way of examples.

The use of prefabricated modules according to the invention simplifies the construction of railway tracks in urban environments, considering the well-known disadvantages of a too large and/or long right-of-way in the urban area. Modules are fairly easily built by concrete casting in one or several moulds containing reinforcement steel.

The invention also permits the amount of work and the delivery times for a serviceable railway track to be minimized as this avoids the need for casting one or several concrete slabs ‘in situ’ for supporting the railway track. Besides, using modules serving, through the channels of their respective buckets, as receptacles for casting fluid concrete and making sleepers, is a technique comparable to permanent formwork. Thus, concrete is casted along the track only where necessary (sleepers) and, moreover in smaller quantities than with the conven tional technique. The railway track built is also lighter than with the conventional technique.

The invention also alters the conditions for water flow within the railway track. Indeed, not only the module is of interest for building grass-seeded railway tracks, but communication openings between the two upper and lower fac-es/spaces of the module may also be useful in case of a naturally draining soil, because water, e.g. rain water, falling from the top of the railway track can flow through the same and reach the soil where it drains off, unlike the conventional systems in which there is a barrier preventing water flow through the railway track (e.g. due to the use of a concrete raft or of support and fastening elements for continuous rails without communication) and where it is necessary to provide a specific draining system.

The invention will be better understood on the basis of the following description which relates to a preferred embodiment given by way of a non-restrictive example and explained with reference to the accompanying drawings, in which: Fig. 1 is an axial view (ie along the track axis) of a cross-section through a module according to the invention,

Fig. 2 is a top view of the module,

Fig. 3 is a side view (ie transverse/perpendicular to the track axis) of an axial section through the module,

Fig. 4 is an axial view of a cross-section of a double track incorporating the modules according to the invention,

Fig. 5 is a top view of a railway track built by assembling modules placed side by side and aligned,

Fig. 6 is an axial cross-sectional view of a bucket of the module of a track with associated rail in the case of a sleeper being produced by casting fluid concrete, and

Fig. 7 is an axial cross-sectional view of a bucket of the module of a track with associated rail in the case of a sleeper including a stop block held by locking concrete.

In Fig. 1 to 3 the module 1 for supporting rails of a railway track, which is a prefabricated single-piece element of reinforced concrete (reinforcing steels are schematized with thick dotted lines in Fig. 1) comprises, laterally with respect to the central axis of the track, two elements, the so-called buckets 2 for support and fixation of the two rails of the track and, in the transverse space between the two buckets, a transverse connecting means 3 connecting the two buckets 2.

The bucket has the shape of a channel 20 open upwardly and laterally at its two axial ends (along the length of the track rail). The channel 20 of the bucket 2 is thus bounded laterally by two lateral internal faces 21 and a bottom 22. In this embodiment the two lateral internal faces 21 of the bucket channel are inclined to obtain a global dovetail shape of the bucket channel in axial view, the bottom 22 of the bucket channel being wider than the upward upper opening of the channel 20 of the bucket 2. The dovetail shape ensures better holding force of the sleeper produced in the channel 20. As an alternative, the two lateral internal faces 21 of the bucket channel are vertical. Furthermore, the bucket includes apertures 4 (diameter approx. 40 mm) to grip the module for handling purposes.

In this embodiment, the global external size of the bucket 2 in axial view (Fig. 1) has a substantially truncated-pyramidal shape with the external lateral faces 23 of the bucket being substantially inclined (except at bottom part on central side of the module in Fig. 1). In an alternative embodiment, the global shape is parallelepipeds with vertical lateral external faces 23. In top view (Fig. 2) the module 1 has a globally rectangular outer shape and is best suited for a straight linear railway track with the modules being perfectly joined to one another along the track. It will be shown later that module shapes with axial non-parallel edges are feasible for curved tracks.

The typical dimensions of a module (external size) are : 750 mm length (along the track axis), 2130 mm width (perpendicular to track axis) at the base, 2110 mm width at the apex, 300 mm height. Width of the bucket channel at its narrow open apex : 400 mm, at its broad base : 480 mm and height: 200 mm. Distance between two buckets (= jamb length) : 720 mm. Jamb width at the base : 125 mm and at apex :110 mm, with the edge of the jamb on the central opening side being inclined, jamb height : 200 mm. As a result, the opening measures 500 mm axially (along the track axis) at the base of the module. Transverse distance between apexes of the two buckets is 790 mm. Apertures 4 for gripping the module are approx. 40 mm in dia. Obviously, all dimensions are approximate and given for reference only.

In this embodiment, the transverse connecting means 3 comprises two jambs 31 separated axially by a communication opening 30. Therefore, jambs 31 extend between the two buckets 2 so that the transverse space includes the opening 30 for communication between the two volumes defined above and beneath the module. The two jambs are disposed at both axial ends (track axis) of the module. Fig. 2 and Fig. 3 show that the axial end edge 32 of the axial end jamb of the module is in the same plane as the two axial faces 24 of the two buckets 2 at the same axial end of the module so that, when the modules are joined together, there is no substantial discontinuity between the axial end edges 32 of two adjacent jambs and between the two axial faces 24 of two adjacent buckets 2. Accordingly, at least for a straight railway track section, the elongated channel obtained by joining together channels 20 of a set of assembled and aligned modules is substantially continuous and shows no discontinuity in the alignment of its lateral internal faces 21. The fluid concrete casted into such aligned channels is thus not likely to escape (subject to gripping apertures 4 being provided).

Channel 20 of the bucket 2 is meant to receive a reinforced concrete sleeper 5 obtained by casting fluid concrete and including threaded rods. The associated rail 8 is laid and fastened by bolting on said threaded rods by means of saddles and pads, as shown in Fig. 6. In one alternative embodiment illustrated in Fig. 7, the sleeper comprises a stop block 6 of reinforced concrete secured in the channel by a locking concrete 7 and on which the associated rail 8 is laid and fastened. Rail 8 is secured to the sleeper or to the stop block by bolting on threaded rods with the interposition of saddles and use of pads identified under common reference number 9 in the Figures.

In Fig. 4 a grass-seeded double railway track has been built. It is resting on a soil 10 prepared for a sufficient bearing capacity. Networks 14, e.g. power supply, signalling, water sprinkling .... have also been incorporated. Draining means 13 of agricultural drainage type D80 have also been provided. Inner faces (bases) of the two buckets 2 and jambs 31 are lying in the same plane and the module is therefore resting uniformly on the soil 10 forming the platform.

The soil is either a natural soil or a brought-in soil, which in both cases is a worked soil and onto which an adjusting layer can be laid for land levelling within +/- 1 cm. In this example, a geotextile 15 laid on the soil surface is inserted between soil and modules. A proper filling forming a filling layer 11 of a height substantially corresponding to the height of a module has been done. The grass-seeding layer 12 reaching the upper level of rails 8 is disposed on said filling layer 11.

Typical height dimensions of the various layers of the track from the soil at approximate level - 490 mm up to the open air, on the grass-seeded side, are : filling layer 300 mm, grass seeding layer 170 mm, clear height of the rail 20 mm above grass seeding layer. Of course, all dimensions are approximate and given for reference only, especially as the grass seeding layer contains a living element likely to grow.

Shown in Fig. 5 is the side-by-side arrangement of aligned modules along the railway track without filling layer and without grass seeding. Preferably, the sleeper reinforcement is done over a length greater than the (axial) length of a module so that the same reinforcing steel passes through several buckets of the modules.

The basic principle of railway track laying using the modules according to the invention will now be described. On the basis (directly or not, e.g. with insertion of a geotextile) of a platform adjusted at approx. 50 cm depth relative to the rail finished level after earthwork, prefabricated modules provided with buckets are laid in contact with each other and aligned in order to form two lines of bucket channels designed to produce two parallel sleepers per track. The rails equipped with stop blocks or holding saddles are then positioned onto the sleepers formed inside said buckets and are adjusted (altimetry and planimetry) in a conventional way by means of templates and lifting rods. A very plastic or fluid concrete is used to ensure fastening of rails inside each bucket, thus forming two cohesive sleepers that will hold the rails in position. If holding saddles with anchor rods are used, a reinforcement of the locking concrete should be provided in the form of steel bars tied together and of suitable cross-section. If stop blocks are used, these are secured in the bucket channels by the hardening concrete casted in them.

After mounting the railway tracks according to the method herein above described, a filling with D2 sand-gravel mix or limestone of a grain size matching the vegetal substrate to be laid is performed on the platform sides, between rails and between tracks, thus forming the filling layer.

In the meanwhile, all the systems (wet and dry) required for the automatic water sprinkling device will have been incorporated throughout the thickness of the railway track structure.

Typically, in the case of two parallel tracks, the gauge between the two railway tracks (at center distance) is 3.4 m and may be as low as 3.0 m on the spot. The distance between the two rails is 1.435 m. Lengthwise spacing of stop blocks is 0.75 m.

In praxis, the size of prefabricated modules and sleeper concrete is determined by calculation on the basis of data relating to the railway rolling stock that is meant to run on the track (axle load, bogie wheelbase, rail/wheel contact, etc...) and to the conditions of circulation of tramways (speed, profile, curves, braking, etc ...).

By way of example, the following elements may be considered, which have been used to perform strength calculations for modules of a given structure and a use thereof with stop blocks. The tramway road rests on a soil which module is fixed at E = 35 MPa or E = 50 MPa. The platform consists of modules with two buckets and two jambs of pre-cast concrete within which the rail supporting stop blocks are laid. The stop blocks disposed in the bucket channels are embedded in locking concrete. Reinforcing steels are provided for buckets, jambs and stop blocks. By way of example, FeE500 reinforcing steel bars for reinforced concrete, of high bonding quality with minimum 3 cm concrete cover, are used.

Stop blocks and modules are made of C50 concrete (fC28 = 50 MPa). Locking concrete is of C30 quality (fC28 = 30 MPa).

On the basis of calculations made under various conditions, especially track loading conditions, settlements and stresses remained below the generally permissible limits for the respective materials. Furthermore, horizontal forces and expansion forces are sustained in a satisfactory manner.

More in details, the construction of the railway track with the modules according to the invention requires earthwork, adjustment and stabilization of the track platform at level - 50 cm with respect to the rail running surface with -1/+2 cm or better +/-1 cm allowance. The platform forms the soil which is either the original natural soil or a brought-in soil as per the initial local properties of the land. The platform load-bearing capacity is suitable for an EV2 > 35 MPa. Preferably, this feature should be checked by a plate load test on the platform or subgrade.

The platform must be clean and free of sharp protrusions. When needed, and to avoid any adverse effects of weather conditions on the bearing capacity of the subgrade, a surface treatment by grit spreading and application of an emulsion layer may be recommended. Besides, in case of unevenness of the subgrade, a thin layer of sand or screened aggregates of reduced size (0/8 mm) can be deposited and properly spread and levelled prior to laying the modules.

In the event of the railway track being entirely constructed ‘in situ’, rails are delivered to the construction site by trucks with extendable trailers on the basis of 22 rails of 18 ml per truck. They are unloaded by means of a mechanical shovel fitted with rail clamps. Where needed, the rails are slung to reduce their range of motion. Rails are distributed along the platform on each side of the future railway track. In another embodiment the rails are conveyed to the site after installation of the modules.

The modules with buckets and jambs are then delivered by tractor-trailers directly from the manufacturing unit or from a storage area in vicinity of the job site. Packed on dunnage the buckets are discharged using a mechanical shovel fitted with forks or a forklift. They are arranged directly edge to edge and aligned, for the continuity of bucket channels, on the platform along track alignment benchmarks established by surveyors.

Once the modules are in place, the rails are positioned on timber supports resting on the upper faces of buckets. Insulating saddles equipped with a fastening system (Nabla®) are then mounted on the rails. Once the track is completely steel-reinforced, an altimetric and planimetric adjusting device is then placed on the rails (setting templates) to allow X, Y, Z positioning of railway tracks. Rails are then aluminothermically welded. Track covering is conventionally performed before rails are fixed into the sleeper concrete, in order to access the rail base and ensure the best possible insulation.

To be noted is that, in the case of hard-to-access areas or areas requiring a limited impact of the job site for residents, local merchants and users, the rails may be pre-assembled in the workshop with the saddles already assembled and the rail cover elements positioned and delivered on the site directly by conventional means (tractor-trailers and mechanical shovels). On-site assembly is thus significantly speeded up and the global time for the work may be considerably shortened.

An alternative embodiment which is even faster to implement consists of prefabricated two-rail track sections of a given length that are delivered and laid onto the platform. Each of the sections comprises a set of modules aligned and joined together, two reinforced concrete sleepers made by casting concrete into each of the two bucket channels, said sleepers also including threaded rods, saddles and pads being disposed on the sleepers, the rails being placed on the saddles and fastened by bolting pads on the threaded rods. The various networks, as needed, may be installed in many areas reserved for this purpose.

For securing the track constructed ‘in situ’, a fine adjustment is carried out by surveyors and after correct positioning of the rail tracks, the latter are secured by casting very plastic or self-compacting concrete of suitable grain size (0-16) if allowed by the track geometry. Once the concrete is hard, adjusting tools are dismounted and removed, cleaning and finishing work can then be done.

Filling of all voids of the platform (between rails, platform sides and between tracks) can then be carried out using gravel, limestone, crusher material of small grain size (e.g. 0/10) or topsoil with a burden of sand and rock mixture (4-16 mm). This backfill for forming the filling layer 11 will undergo compaction and will be spread and levelled down to approx. - 20 cm so that the rest of the structure is reserved for laying the substrate to be grass-seeded and for the grass seed constituting the grass seeding layer 12.

Modules are produced by conventional concrete casting methods in moulds containing reinforcing steel. However, for the construction of the dovetailshaped bucket channels which contain a recess, a steel countermould or a plastic disposable piece, for example, is inserted into the mould during casting, which allows the recess to be formed and which will be removed after concrete setting. The steel reinforcement extends both in buckets and jambs. Besides, when sleepers are subsequently produced, a reinforcement is also placed in the bucket channels before casting fluid concrete therein.

The modules described above and having a globally parallelepipeds outer shape are specifically suited for linear (= straight) track sections in order to avoid discontinuities between the side walls of aligned bucket channels and through which the fluid concrete that has been casted to form the sleeper is likely to escape. Indeed, this outer shape guarantees continuity of the walls of aligned channels for a linear railway track. In the case of a curved track, several solutions are feasible. If the curve has a great radius, the angular offset between parallelepipeds modules will be small with only slight discontinuities between the walls of successive channels, which can be compensated by plugs of any suitable material prior to casting the sleeper fluid concrete. A further example consists in isolating the discontinuities using a small width strip disposed at adjacent ends of the channels of the two buckets of two adjacent modules and bridged over the discontinuity. For instance, the strip may be a flexible vulcanised rubber strip or a plastic clip matching the dovetail shape of the channel faces. In the latter case, the sleeper casted concrete will no longer be in contact with the walls and bottom of the channel in a direction toward the ends of said channel of a bucket for a given module. In an alternative embodiment, such a flexible strip is disposed throughout the channel length both on a linear and curved track section and the sleeper concrete is thus separated from the walls and bottom parts of bucket channels by the strip that may be resilient, which contributes to an additional cushioning/flexibility/insulation effect in the track. Another solution for curved track portions is to implement modules with two axial end faces which, instead of being parallel to each other, are convergent. Seen from above, the module then has a truncated triangular external shape. It is understood, however, that, for a perfect continuity between bucket channels, this solution makes it necessary to build modules with axial end faces having convergence angles perfectly suited to the radius of curvature of the track. Otherwise, there will be a discontinuity as in the case described herein above and the solutions depicted can then be implemented to fill/isolate the gaps and prevent leakage of fluid concrete while it is casted to form the sleeper.

It is well understood that that many modifications can be made to the prefabricated module for supporting a railway track, the railway track, the prefabricated railway track section or the method for mounting such a railway track described herein, without departing from the scope defined by the description and claims.

Claims (10)

A railway track module (1) support (8) comprising two laterally relative to the central axis of the track, two support rails arranged on the track, and a cross-connection means (3) being arranged in a cross-space between two support members. ), which connects the support members and wherein the support member is adapted to accommodate a longitudinal sleeve (5) (6, 7) of reinforced concrete comprising some threaded rods and on which some anchoring support plates are provided which support the rail by means of bolted joints. by some foot portions of the threaded rods which are passed vertically through the support plates, which module allows green growth to grow on the surface of the railway track, characterized in that the module is made of reinforced concrete and designed as a prefabricated block, each support member being constituted by a vessel (2) having the shape of a channel (20) open upwardly and laterally at its two axial ends; ends, seen along the axis of the track rail, and that a transverse connecting member comprises at least two side portions (31) which are axially spaced apart and extending between two vessels so that a transverse compartment comprises at least one opening (30) capable of connecting between two compartments, namely the compartment above the module and the compartment below said module, and that the lower parts of the two vessels (2) and some side pieces (31) of the module are in the same plane and that the two are axially spaced apart from one another surfaces (24) of the two vessels (2) at the same axial end (24) of the module are vertical and are in the same plane, so that when the modules are brought together and aligned, there is no noticeable irregularity between the interiors. side surfaces (21) in the channels (20) of the aligned vessels (20). Module according to claim 1, characterized in that a side piece (31) extends between the two vessels (2) at each of the two axial ends of the module, and that at its middle part the cross-connection means has an opening (30), and this to provide a connection between two spaces, namely the space above the module and the space below the module. Module according to claim 2, characterized in that the axial end edge (32) of the axial side of the module is in the same plane as two axial end faces (24) of the two vessels at the same axial end of the module, so that - when the modules are brought together - there is no discontinuity to be felt between the axial end edges of the two joined side pieces. Module according to any one of the preceding claims, characterized in that two inner side surfaces (21) of the channel (20) in the vessel (2) incline so much that the shape corresponds to a dovetail and a bottom (22) in the channel (20) in the tub is much larger than the upper opening upward in the channel of the tub. Module according to any one of the preceding claims, characterized in that two outer side surfaces of the vessel are inclined and the bottom part of the vessel is larger than the top at the top of the vessel and the vessel has outer dimensions substantially similar to the outer dimensions of a pyramid stub seen in FIG. cross-section. Module according to any one of the preceding claims, characterized in that the height of the vessel (2) is greater than the height of the side pieces (31). Module according to any one of the preceding claims, characterized in that the longitudinal sleeper is either a result (5) of casting of liquid concrete throughout the channel of the vessel, or is the result of the installation of some stop blocks ( 6) for supporting and fastening the rails, which stop blocks are retained in said channels by means of a concrete wedging concrete column (7). A two-track railway track having green growth at the surface, characterized in that it comprises a collection of modules (1) according to any one of the preceding claims, which modules are joined and aligned and each rail (8 ) is fixed to and in a longitudinal sleeve (5) (6, 7) of reinforced concrete made by casting concrete in a duct (20) in vessels (2) which are similar and aligned which modules are placed on a prepared soil (10), a mixed green vegetation (12) spread over the track. A pre-made profile for two-track (8) rail tracks of specified length, characterized in that it is made up of a collection of modules according to any one of the preceding claims 1 to 7, which are arranged in line and joined together, and that two longitudinal sleepers (5) (6, 7) of reinforced concrete are made by casting concrete in channels (20) which are aligned in some vessels (2), which include, among others, some threaded rods, some anchoring supports and footplates which are mounted on the longitudinal sleepers and that the rails are placed on the support plates and held by means of bolts by footplates on the threaded rods. Method for mounting two rail tracks with a mixed green vegetation on the surface, characterized in that: - preparing a piece of soil (10) to obtain a load-bearing surface, - placing it on the prepared soil side by side. placing a series of modules (1) according to any one of claims 1 to 7, - installing a reinforcement in the ducts (20) in the vessels (2) of some modules, - installing threaded rods, support plates, footplates (9) and rails (8) - positioning the rails along some in-line ducts in some vessels, - pouring liquid concrete into the ducts in the vessels of the modules, so that some longitudinal sleepers (5) (6, 7) placed in the vessels are obtained. and contains the threaded rods.