WO2002035006A1

WO2002035006A1 - Module for modular bridge and method for mounting such a bridge

Info

Publication number: WO2002035006A1
Application number: PCT/FR2001/003211
Authority: WO
Inventors: Pierre Dequet
Original assignee: Pierre Dequet
Priority date: 2000-10-24
Filing date: 2001-10-17
Publication date: 2002-05-02
Also published as: FR2815651A1; AU2002210656A1; FR2815651B1

Abstract

The invention concerns a modular logistic bridge characterised in that it is produced by an abutting assembly of a plurality of modules each comprising an upper platform (1) and a lower platform (2) detachably interconnected by vertical members (3a, 3b) and guide elements (4a, 4b) so as to provide a passage between two storeys.

Description

MODULE FOR A MODULAR BRIDGE AND METHOD FOR MOUNTING SUCH A BRIDGE

Modular bridge module, modular bridge formed from an assembly of such modules and method of mounting such a modular bridge.

The present invention relates to a module for a modular bridge, to a modular bridge formed by an assembly of such modules, and to a method of mounting such a modular bridge. we are particularly aware of documents FR 2 255 423 and EP 0 449 064 of examples of modular bridges formed from an end-to-end assembly of a plurality of elementary modules.

These modular bridges, intended for both civil and military use, make it possible to cross breaches of several tens of meters such as rivers.

Although they have great flexibility of use, these modular bridges of the prior art have a relatively narrow cross section.

This small width is imposed by the transport constraints of the modular elements on conventional communication routes such as roads.

It follows from this narrow width that the flow of traffic in one direction on the modular bridge is limited and, in any event, that it is not possible to envisage bidirectional traffic. This is very penalizing in particular for military operations requiring a high speed of intervention.

The object of the present invention is to provide means making it possible to remedy this drawback.

The object of the invention is achieved with a module for a modular bridge, remarkable in that it comprises an upper plate and a lower plate which are detachably connected together by uprights and guide elements so as to allow circulation on two floors.

Thanks to the characteristics of this module, a modular bridge can be mounted with two superimposed traffic lanes, which makes it possible to solve the problems of traffic flow and / or bidirectional traffic mentioned above.

Due to its removable nature, the module according to the invention can quite be transported on conventional traffic lanes.

The present invention also relates to a modular bridge, remarkable in that it comprises an end-to-end assembly of a plurality of modules in accordance with the above, and to methods of mounting and dismounting this modular bridge.

Other characteristics and advantages of the present invention will appear on reading the description which follows and on examining the appended drawings, in which:

FIG. 1 is a perspective view of a module according to the invention,

FIG. 2 is a perspective view of the uprights and of the guide elements of said module,

FIG. 3 is a perspective view of a connection zone of an upper plate of said module with one of said guide elements, - FIG. 4 is a perspective view of a lower plate of said module, FIG. 5 is an exploded perspective view of a connection zone of one of said uprights with said lower plate,

FIG. 6 is an exploded perspective view of said upper plate,

FIG. 7 is a side view showing the rolling means fixed under said lower plate,

FIG. 8 is a detailed perspective view of said rolling means,

FIG. 9 is a perspective view of an orientable platform intended for the positioning of said modules,

- Figure 10 is a perspective view of handling means, - Figure 1 1 is a perspective view of connecting means of said platform with a supply truck,

FIG. 12 is a perspective view of an access ramp connected to a modular element, and of a ramp detached from a modular element,

- Figure 13 is a perspective view from below of modules being put in place, - Figure 14 is a perspective view of templates intended to allow the pushing of said modules,

- Figure 1 5 is a perspective view of two of said jigs when placed on said platform, Figures 16 to 18 are perspective views of different phases of disassembly of the modular bridge according to the invention, FIGS. 19 to 31 schematically represent the various stages of mounting the modular bridge according to the invention, FIG. 32 represents a raceway for the routing and the support of the modules on the arriving bank. In these figures, identical references designate identical or similar members or sets of members.

Modular elements

Let us now refer to FIG. 1, on which we see that a modular element according to the invention comprises an upper plate 1 and a lower plate 2 which are detachably connected together by uprights 3a, 3b and by guide elements 4a, 4b.

Referring to FIG. 2, we see that the uprights 3a, 3b define a structure of the "lattice" type in which, preferably, the distance d1 separating the upper parts of consecutive uprights is substantially equal to the distance d2 separating the lower parts of consecutive uprights. The guide elements 4a, 4b substantially define angles comprising, on their horizontal parts 5a, 5b, retractable bearing balls 6, that is to say balls which sink when they are subjected to a weight exceeding a predetermined threshold.

The guide elements 4a, 4b further comprise orifices 7a, 7b capable of receiving double action ball pins (see below).

In addition, holding systems 8a, 8b are articulated on each guide element 4a, 4b. The ends of the guide elements 4a, 4b comprise reinforcing parts 9a, 9b, 9c, 9d, formed for example from stainless steel.

^• - Referring to Figures 1 and 3, we see that the upper plate 1 comprises a plurality of cavities 10 which can be closed by covers 11a to 11d, these cavities being placed above orifices 12 intended to be positioned in line with the openings 7 and each capable of receiving a double action ball spindle

13 for blocking the horizontal movements of the upper plate 1 relative to the guide elements 4a, 4b.

We also see in FIG. 3 how each holding system 8 cooperates with the upper plate 1 so as to keep it integral with each guide element 4.

Referring to Figures 4 and 5, we see that the lower plate 2 includes pins 14a to

14d capable of cooperating with mortises 15 of corresponding shape formed in each upright 3.

Preferably, as can be seen in Figure 5, each pin 14 and ^'each mortise 15 includes a respective reinforcing member 16, 17 formed for example of stainless steel. Also preferably, double action ball pins 18 are also used here to block the uprights 3 relative to the lower plate 2.

We also see in FIG. 4 that the ends of the lower plate 2 comprise reinforcing elements 19a, 19b, formed for example from stainless steel, these elements comprising cylindrical mortises 20 which can receive, as can be seen in FIG. 1, pins 21 for connecting the modules together.

Referring to Figure 6, we see that the upper plate 1 is preferably surmounted by a rubber sheet 22, itself surmounted by a wear plate 23, and that the ends of this plate are preferably reinforced by elements 24a, 24b formed for example from stainless steel.

Referring to FIGS. 7 and 8, we see that the lower plate 2 is provided with a plurality of rolling means of which two pairs 25a, 25b have been shown, these pairs being arranged so as to bear on rails 26a, 26b arranged on a platform 28 (on which more explanations will be given later) respectively under the plate 2 and on the side of this plate.

As clearly appears in FIG. 8, each rolling means comprises a roller chain 31 capable of rotating by sliding around a support member 32. Preferably, apart from the abovementioned stainless steel reinforcing parts, the various constituent elements of the module (upper plates 1 and lower 2, uprights 3 and guide elements 4) are formed from a composite material.

This composite material can comprise a matrix of thermosetting resin containing glass fibers, as well as possibly glass microspheres.

The pusher truck

To assemble and disassemble the modular bridge according to the invention, it is necessary to have recourse to a pusher truck 27 comprising a platform 28 visible in FIGS. 9 and 10, this platform being orientable by means of a plurality of double jacks effects, two of which 30a, 30b are visible in FIG. 10. As shown in FIG. 9, the platform 28 has four zones 29a, 29b, 29c, 29d.

The zone 29a is intended to receive handling means 33 visible in FIG. 10, and which will be described in more detail below.

The areas 29b, 29c, 29d are traversed by a pair of parallel rails 26a.

The intermediate zone 29c comprises a pair of retaining angles 34 placed opposite, supporting a pair of rail segments 26b parallel to each other.

Referring more specifically to FIG. 10, we see that the handling means 33 comprise a crane 35, lower double-acting cylinders 36a, 36b provided with traction hooks 37a, 37b, upper double-acting cylinders 38a, 38b also provided with traction hooks 39a, 39b, and winches 40a, 40b. Preferably, the crane 35 is mounted movable in translation on the platform 28, thanks to the guide tracks 41a, 41b fixed on this platform.

Modular bridge assembly

To mount the modular bridge according to the invention, the process proceeds as follows.

We start by bringing the pusher truck 27 comprising the platform 28 (see figures 9 and 10) to the place where we wish to build a modular bridge to cross a breach 42 such as a watercourse (see figure 19) ,

This pusher truck 27 is coupled to a truck known as truck A (see FIG. 19), carrying upper plates 1 of modules (see FIG. 1).

Preferably, as shown in Figure 1 1, the truck A is pivotally coupled to the pusher truck 27, thanks to adjustable articulated arms 43a, 43b, allowing slight movements of the pusher truck 27 linked to the assembly operations of the modular bridge (see figure 19).

By means of the jacks 30a, 30b (see FIG. 10) the part of the platform 28 which is closest to the breach 42 is raised. Is brought next to said pusher truck on the one hand a truck transporting lower plates 2 of modules, said truck B, and on the other hand a truck transporting uprights 3 and guide elements 4 of modules, said truck C (see figure 19).

The crane 35 takes a lower platform 2 on the truck B and deposits it on the platform 28, in the zone 29b.

This lower plate 2 is pushed by means of the lower jacks 36a, 36b so as to bring it into the zone 29c of the platform 28, between the retaining angles 34.

Uprights 3 and guide elements 4 are taken from the truck C and they are mounted on this lower plate 2. A truck, called truck D, transporting ramps to the modular bridge is brought next to said pusher truck.

Such an access ramp 44 is shown in detail in FIG. 12. As can be seen in this figure, this ramp substantially defines a rectangle comprising a day 45 also rectangular in its central part, a plate 46 being provided in the lower part of ramp 44 to allow the crossing of day 45.

The access ramp 44 is taken from the truck D and is mounted and bolted by high-strength bolts on the assembly formed by the lower plate 2, the uprights 3 and the guide elements 4 facing the gap 42 (see figure 20).

The access ramp 44 is lifted by means of jacks 47 interposed between this access ramp and the lower plate 2 (see FIG. 1).

The lower cylinders 36a, 36b are then retracted, then another lower plate 2a is taken from the truck B, and is deposited on the platform 28 between said lower cylinders and the previous lower plate 2.

Uprights 3 and guide elements 4 are then taken from the truck C and are mounted on the lower plate 2a. Pins 21 (see FIG. 1) are placed in the cylindrical mortises 20 (see FIG. 4) of the lower plates 2 or 2a and in the cylindrical mortises 20 (see FIG. 2) of the guide elements 4a and 4b, then the lower plate 2a is pushed by means of the lower cylinders 36a, 36b against the lower plate 2 above.

In doing so, the lower plate 2a passes from the zone 29b to the zone 29c, and the lower plate 2 passes from the zone 29c to the zone 29d (see FIG. 21).

To complete the joining of the two lower plates 2 and 2a, we can also use high-strength bolts to fix the end elements 19a, 19b of the plates between them (see Figure 4). To complete the joining of the guide elements 4a and 4b of two adjoining modules we can also use high-strength bolts allowing the reinforcement pieces 9a, 9b 9c and 9d to be fixed between them. FIG. 22 represents the installation of a lower plate 2b as well as that of its corresponding uprights and supports.

These pushing and mounting stages of the lower plates of the uprights and of the guide elements are repeated until a bridge length sufficient to cross the breach 42 is obtained (see FIG. 23, on which a bridge comprising lower plates 2 to 2e, as well as their corresponding uprights and guide elements).

Once the first assembly formed by the lower plate, the two uprights and supports has crossed the breach, a raceway 55 (see FIG. 32) is provided so that the latter assembly can rest on said raceway. This operation will greatly facilitate the pushing operation. The length of the lower cylinders 36a, 36b may be insufficient to push the last assembly formed by the lower plate 2, the two uprights 3 and the two guide elements 4, we can use templates 50a, 50b (see Figures 14 and 15 ) which are interposed between the lower cylinders 36a, 36b and the end of the latter assembly.

The already assembled parts are pushed using the lower cylinders 36a, 36b and the pushing jigs 50a, 50b. This has the effect of stabilizing the bridge at the level of the arriving bank. (see figure 24).

Truck A is then uncoupled from said pusher truck 27, and is brought alongside this pusher truck (see FIG. 25).

An upper plate 1 is then taken from said truck A and is deposited on the guide elements 4 connected to the first lower plate 2e from the pusher truck 27. This upper plate 1 is then pushed by means of the upper cylinders 38a, 38b so to advance it on the guide elements 4. This pushing step is facilitated by the retractable balls 6 (see FIG. 2) which allow the upper plate 1 to roll on the guide elements 4a, 4b.

The upper cylinders 38a, 38b are retracted, then another upper plate 1 a is taken from the truck- A and is deposited on the guide elements 4, between these upper cylinders and the preceding upper plate 1 (see FIG. 26).

This other upper plate 1 a is then pushed by means of the upper cylinders 38a, 38b against the previous upper plate 1.

Figure 27 shows the establishment of an upper plate 1b.

These pushing stages of the upper plates are repeated until these plates extend over the entire length of said bridge, (see FIG. 28, on which is shown a bridge comprising lower plates 2 to 2e, their uprights and elements of corresponding guide as well as upper plates 1 to 1 e).

The upper plates 1 are then fixed to the guide elements 4a, 4b by means of the holding systems 8 on the one hand, and double action ball pins 13 on the other hand (see FIG. 3). Double-acting roller jacks 48 (see FIG. 13) are placed under the end of the bridge located on the side of the pusher truck 27 (that is to say, in the example cited, under the lower plates 2d and 2e ), these jacks allowing this end to be supported while allowing its horizontal sliding.

This end of the bridge is then pushed by means of the lower jacks 36a, 36b so that it leaves the platform 28, then wedges 49 formed for example of hard wood are interposed between this end and the ground.

The first two pushing jigs 50a, 50b may be insufficient to push the end of the bridge to leave the platform 43, we can use two other jigs 50c, 50d (see Figure 29) which are interposed between the first two jigs 50a, 50b and this end. Once the bridge is fully pushed, we act on the jacks 47 of the access ramp 44 so as to lower this access ramp on the other bank.

Once this operation has been completed, the reduced access ramp 51 is brought in and installed at the level of the access ramp 44.

The truck D is again brought next to the pusher truck 27, and a second access ramp 44a is taken on it then is mounted on said end of the bridge (see FIG. 30). This is lowered by means of its jacks 47.

We thus obtain a complete bridge making it possible to cross the breach 42, comprising two access ramps 44, 44a allowing access to the upper platforms 1 defining an upper traffic lane, located above a lower traffic lane defined by the lower plates 2. Figure 31 shows the top view of the bridge finished to be assembled and ready to be used.

We note that the lower plates 2 are practically at ground level, so that a very reduced ramp 51 for access to the lower traffic lane may suffice (see FIG. 1).

To reach the ramp 51, the crossing of day 45 formed in the ramp 44 is carried out, the plate 46 facilitating this passage. Disassembly of the modular bridge

To dismantle the modular bridge according to the invention, the process is as follows

After dismantling one of the access ramps 44, 44a and placing the pusher truck 27 in the extension of the corresponding bridge end, this bridge is pulled by means of straps 52a, 52b (see Figure 16) surrounding the uprights 3a, 3b fixed on the first lower plate 2e and connected to the lower hooks 37a, 37b.

This end of the bridge can in this way be slid onto the platform 28 until the first module is placed in the zone 29b, the following lower plate 2d then being placed in the zone 29c between the retaining angles 34.

It is of course possible to use the roller jacks 48 (see FIG. 13) and the jacks 30a, 30b (see FIG. 10) to facilitate these sliding operations. The fixing means are then removed (holding systems 8, double action ball pins 13, (see FIG. 3) connecting all of the upper plates 1 to the guide elements 4.

A truck A is brought (suitable for transporting upper platforms 1) next to the pusher truck 27. By means of two straps 53a, 53b connected to the hooks 39a, 39b of the double-acting upper cylinders

38a, 38b, the first upper plate 1e is pulled so as to move it away from the adjacent upper plate 1d (see FIG. 18).

The upper plate 1 e is taken by means of the crane 35, and is deposited on the truck A.

By means of another strap 54, the two ends of which are wound on the winches 40a, 40b, we then come to pull on the upper plate situated at the end of said bridge opposite to the pusher truck 27, which has the effect of making it slide. all of the upper plates 1 on the guide elements 4 in the direction of the pusher truck 27 of a length equal to that of an upper plate (see FIG. 17, where only two upper plates 1 e, 1d are shown), and therefore to bring the next upper plate into zone 29b. By repeating these steps of pulling and removing upper trays, we end up having no more upper trays.

To complete the dismantling of the guide elements 4, of the uprights 3 and of the lower plates 2, we then proceed in the reverse order of the steps for mounting these elements, using the straps 52a, 52b (see FIG. 15) for detaching assemblies constituted by the lower plates 2, the uprights 3 and the guide elements 4.

As we can understand in light of the above, the modular bridge according to the invention, by virtue of the fact that it offers two superimposed traffic lanes, makes it possible to solve the problems of traffic flow and / or bidirectional traffic mentioned above of the prior art.

This bridge can be quickly assembled and disassembled by a few qualified personnel. This bridge can be disconnected from any transport vehicle.

The fact of using composite materials makes it possible to reduce the cost and the weight while increasing the durability compared to a modular bridge conventionally made of steel.

The fact of integrating glass micro-beads into the resin of the composite materials makes it possible to reduce the shrinkage of these materials during molding during manufacture, to increase the resistance of these materials, and to reduce the risks of water penetration in these materials.

Of course, the present invention is not limited to the embodiment described and shown, provided by way of illustrative and nonlimiting example. List of references

- 1: upper plate

- 2: lower plate - 3a, 3b: uprights

- 4a, 4b: guide elements

- 5a, 5b: horizontal parts of the guide element

- 6: set of retractable carrier balls

- 7a, 7h: junction orifices - 8a, 8b: Centering holding system with adjusting screw

- 9a to 9d: reinforcement parts of the guide elements

- 10: cavity s for placement of double action ball pick

- 11 a to 11 d: protective covers

- 12: junction orifice - 13: double action ball spindle for junction of an upper plate with a guiding element

- 14a to 14d: pins for assembling a lower plate with an upright

- 15: mortise for assembling an upright with a lower plate

- 16: protective reinforcement of the assembly post

- 17: reinforcements for protection of the assembly mortise - 18: ball pin with double action joining a lower plate with the upright

- 19a, 19b: reinforcing elements of the lower plate

- 20: cylindrical mortises for assembling two contiguous lower plates

- 21: set of pins for assembling modules together

- 22: rubber sheet - 23: wear plate

- 24a, 24b: reinforcing elements of the upper plate

- 25a, 25h: Travel bearings

- 26a, 26h: rails

- 27: pusher truck - 28: steerable platform of the pusher truck

- 29a to 29d: development areas of the platform 28

- 30a, 30b: operating cylinders for platform 28

- 31: roller chains

- 32: support member - 33: handling means

- 34: retaining angles

- 35: handling crane

- 36a, 36h: lower cylinders

- 37a, 37b: traction hooks fitted to the lower cylinders - 38a, 38b: upper cylinders

- 39a, 39h: traction hooks fitted to the upper cylinders

- 40a, 40b: translational winches of the upper platforms

- 41a, 41b: guide tracks in translation of the crane - 42: breche che che or wet

- 43a, 43h: adjustable articulated arms for coupling the pusher truck to the truck A - 44: access ramps

- 45: day for passage to the lower platform

- 46: crossing plate - 47: jaw cylinders from the access ramp

- 48: roller cylinders

- 49: wedges

- 50a to 50d: pushing jigs

- 51: reduced access ramp - 52a, 52b: disassembly straps between the modules

- 53, 53b: straps for translation of an upper plate

- 54: strap fitted to the winches for translation of the upper plates

- 55: Track

Claims

CLAIMS 1. Module for modular bridge, characterized in that it comprises an upper plate (1) and a lower plate (2) connected to one another in a removable manner by uprights (3a, 3b), so as to allow circulation on two floors. 2. Module according to claim 1, character ized in that said upper plate (1) is connected to said uprights (3a, 3b) by means of guide elements (4a, 4b).

3. Module according to claim 2, character ized in that said upper plate (1) is fixed on said guide elements (4a, 4b) by means of holding means (8a, 8b).

4. Module according to one of claims 2 or 3, character ized in that said upper plate (1) is fixed on said guide elements (4a, 4b) by means of double action ball pins (13 ).

5. Module according to any one of claims 2 to 4, character ized in that said guide elements (4a, 4b) comprise a set of retractable carrier balls (6) arranged to cooperate with said upper plate (1).

6. Module according to any one of claims 2 to 5, character ized in that said guide elements (4a, 4b) comprise reinforcing means (9a, 9b) at their ends.

7. Module according to any one of the preceding claims, characterized in that said uprights (3a, 3b) are fixed to said lower plate (2) by means of a device of the stud type (14a to 14d ) and mortise (15).

8. Module according to claim 7, character ized in that said tenons (14a to 14d) and said mortises (15) comprise reinforcing means (16, 17).

9. Module according to any one of the preceding claims, characterized in that said uprights (3a, 3b) are fixed to said lower plate (2) by means of double action ball pins (18).

10. Module according to any one of the preceding claims, characterized in that said upper plate (1) is surmounted by a rubber sheet (22) and a wear plate (23). 11. Module according to any one of the pre-toothed claims, character ized in that said uprights (3a, 3b) are shaped like a lattice.

1. Module according to Claim 11, characterized in that the distance (d1) separating the upper parts of consecutive uprights (3a, 3b) is substantially equal to the distance (d2) separating the lower parts of uprights (3a, 3b ) consecutive, 13. Module according to any one of the preceding claims, characterized in that roller chain bearings (25) are mounted on said lower plate (2).

14. Module according to any one of the preceding claims, characterized in that it comprises cylindrical mortises (20) adapted es for receiving pins (21) for connecting modules together. 15. Module according to any one of the pre-toothed claims, characterized in that it is formed in part from a composite material.

16. Module according to claim 15, characterized in that said composite material comprises a thermosetting resin matrix containing glass fibers.

17. Module according to claim 16, character ized in that said matrix also contains icro-spheres of glass. 18. Module according to any one of the preceding claims, characterized in that said upper plate (1) comprises reinforcing means (24a, 24b) at its ends.

19. Module according to any one of the pre-toothed claims, characterized in that said lower plate (2) comprises reinforcement means (19a, 19b) at its ends.

20. Modular bridge, characterized in that it comprises a buttressing of a plurality of modules according to any one of the preceding claims, so as to allow circulation on two floors.

21. Modular bridge according to claim 20 when said modules conform to claim 14, characterized in that said modules are connected to each other by means of pins (21).

22. Modular bridge according to one of claims 20 or 21, characterized in that said modules are fixed to each other by means of high resistance bolts.

23. Modular bridge according to any one of claims 20 to 22, characterized in that it comprises an access ramp (44, 44a) at each of its ends.

24. Modular bridge according to claim 23, characterized in that each of said ramps (44, 44a) substantially defines a rectangle comprising a cheerfully rectangular day (45) in its central part, a plate (46) being provided in the part lower of each of said ramps (44, 44a) to allow the crossing of said day (45).

25. Modular bridge according to one of claims 23 or 24, character ized in that jacks (47) are interposed between said access ramp (44, 44a) and a corresponding end module.

26. Pusher truck (27) for the establishment of a modular bridge according to any one of claims 20 to 25, characterized in that it comprises a platform (28) orientable by means of cylinders (30a, 30b), and means (34) for holding an end module of said bridge.

27. Pusher truck (27) according to claim 26, characterized in that said platform (28) comprises rails (26a, 26b) for guiding the modules of said bridge.

28. Pusher truck (27) according to one of claims 26 or 27, characterized in that it comprises double acting lower cylinders (36a, 36b) for pushing the lower plates (2) of the modules of said bridge .

29. Pusher truck (27) according to claim 28, characterized in that said lower cylinders (36a, 36b) are provided with traction hooks (37a, 37b).

30. Pusher truck (27) according to any one of claims 26 to 29, characterized in that it comprises upper jacks (38a, 38b) for pushing the upper plates (1) of the modules of said bridge.

31. Pusher truck (27) according to claim 30, characterized in that said upper cylinders (38a, 38b) are provided with traction hooks (39a, 39b).

32. Pusher truck (27) according to any one of claims 26 to 31, characterized in that it comprises winches (40a, 40b). 33. Pusher truck (27) according to any one of claims 26 to 32, characterized in that it comprises a handling crane (35).

34. Pusher truck (27) according to claim 33, characterized in that said crane (35) is mounted movable in translation on said platform (28).

35. Process for mounting a modular bridge according to claim 23 formed by an assembly of modules according to claims 1 and 2 by means of a pusher truck (27) according to claims 28 and 30, characterized in that that it includes the steps of:

a) in bringing said pusher truck (27) to the point of crossing a break (42),

- b) coupling said pusher truck to a truck, said truck A, transporting upper plates (1) of modules of said bridge, - c) to raise by means of said jacks (30) the part of said platform (28) which is closest to said breach (42),

- d) to bring next to said pusher truck on the one hand a truck transporting lower plates (2) of modules of said bridge, said truck B, and on the other hand a truck transporting uprights (3) and elements guide elements (4) of modules of said bridge, said truck C, - e) to take a lower plate (2) on said truck B and to place it on said platform

(43)

- f) pushing this lower plate (2) by means of said lower cylinders (36a, 36b) so as to bring it into said holding means (34),

- g) to take uprights (3) and guide elements (4) on said truck and mount them on this lower plate (2),

h) to bring alongside said pusher truck a truck, said truck D, transporting said access ramps (44, 44a),

- i) to take an access ramp (44) on said truck D and to mount it on the assembly formed by said lower plate (2), by said uprights (3) and by said guide elements (4 ), facing said breach (42),

- j) lifting said access ramp (44),

- k) to retract said lower cylinders (36a, 36b),

- 1) to take another lower plate (2a) on said truck B and to deposit it on said platform (28), between said lower cylinders (36a, 36b) and the lower plate (2) before this tooth , - m) pushing said other lower plate (2a) by means of said lower cylinders (36a, 36b) against said lower plate (2) before this tooth, - n) to take uprights (3) and guide elements (4) on said truck. Mount them on said other lower plate (2a),

- o) securing said other lower plate (2a) with said lower plate (2) before this tooth, p) to repeat steps k) to o) until a sufficient bridge length is obtained to cross said breach (42),

- q) to stabilize the bridge on the arriving bank, in particular with the help of the raceway (55)

- r) uncoupling said truck A from said pusher truck (27),

- s) bringing said truck A next to said pusher truck (27),

- 1) taking an upper plate (1) on said truck A and placing it on the guide elements (4) connected to the first lower plate (2e) starting from said pusher truck (27),

- u) pushing this upper plate (1) by means of said upper cylinders (38a, 38b) so as to make it advance on said guide elements (4),

- v) to retract said upper cylinders (38a, 38b),

- w) to take another upper plate (1a) on said truck A and to place it on said guide elements (4) between said upper cylinders (38a, 38b) and the upper plate (1 ) pre this tooth,

- x) pushing said other upper plate (1a) by means of said upper cylinders (38a, 38b) against said upper plate (1) before this tooth,

- y) to repeat steps v) to x) until said upper plates (1) extend over the entire length of said bridge, - z) to fix said upper plates (1) on said é guide elements (4),

- aa) to place support and sliding means (48) under the end of said bridge located on the side of said pusher truck (27),

- ab) pushing this end so that it leaves said platform (28),

ac) to interpose wedges (49) between this end and the ground, ad) to bring said truck D next to said pusher truck,

- ae) to take another access ramp (44a) on this Detàla truck to mount on the end of said bridge located on the side of said pusher truck, and to

- af) lower said other access ramp (44a).

36. A process according to claim 35, character ized in that roller cylinders (48) are used to implement said step aa).

37. Process according to one of claims 35 or 36, characterized in that interposed templates (50a, 50b) between said lower cylinders (36a, 36b) and the end of said bridge located e side of said pusher truck to implement said step q).

38. Process according to one of claims 35 or 36, character ized in that interposed jigs (50c, 50d) between the jigs (50a, 50b) and the end of said bridge located on the side of said pusher truck to implement said step ab).

39. Method for dismantling a modular bridge according to any one of claims 20 to 25 formed by an assembly of modules according to claims 1 and 2 by means of a pusher truck (27) according to claims 28 , 29 and 32, characterized in that it comprises the stages consisting:

- a) pulling said bridge by means of straps (52a, 52b) cooperating with the traction hooks (37a, 37b) of said lower cylinders (36a, 36b), so that an end module of said bridge comes to be placed on said platform (28) in said holding means (34),

b) undoing the fixing means connecting said upper plates (1) to said guide elements (4),

c) bringing a truck, said truck A, next to said pusher truck (27), suitable for transporting upper trays (1) of modules of said bridge,

- d) to take the upper plate (1e) located at the end of said bridge which is closest to said pusher truck (27) and to place it on said truck (A), - e) to strap the plate upper (1) located at the end of said bridge which is furthest from said pusher truck (27) by means of a strap (54) capable of being wound on said winches (40a, 40b),

- f) actuating said winches (40a, 40b) so as to make all of the upper plates (1) slide on the guide elements (4) in the direction of said pusher truck (27),

g) taking the new upper plate (1d) located at the end of said bridge which is closest to said pusher truck (27) and placing it on said truck C, and

- h) to repeat all the steps d) to g) until there are no more upper plates (1) on said guide elements (4).

40. Process according to any one of claims 35 to 39 in which a pusher truck (27) is used in accordance with claim 33, characterized in that all the handling operations are carried out by means of said crane ( 35).