EP3821081A1

EP3821081A1 - System for shielding a trench

Info

Publication number: EP3821081A1
Application number: EP19748870.3A
Authority: EP
Inventors: Marc Lefebvre
Original assignee: Individual
Current assignee: Malon AB
Priority date: 2018-07-12
Filing date: 2019-07-09
Publication date: 2021-05-19
Also published as: WO2020012118A1; FR3083808B1; FR3083808A1

Abstract

The invention relates to a system (1) for shielding a trench (100), which comprises poles (2), cross-members (7 to 11) supported by the poles, which to this end each comprise means for receiving said cross-member, shielding parts (12 to 14) adjacent to one another and positioned in a space that is left between the lateral side of the trench and the cross-members, struts (15) extending transversely and configured to come into abutment against the cross-members or against the poles arranged opposite on the two lateral sides of the trench.

Description

TRENCH ARMORING SYSTEM

Technical area

The present invention relates to the field of trench shielding systems produced during excavation or excavation work on a site, such a trench shielding system making it possible to protect against the risks of landslides and d 'burial, to ensure the safety of operators working in the trench.

The main objective of the present invention is to facilitate the installation of the shielding system in the trench, as well in a free trench as in a trench congested by existing networks. State of the art

A trench shielding system, as commonly used, has large metal plates arranged vertically and end to end along the length of the trench, on each of the two lateral sides of said trench. The metal plates are arranged vis-a-vis on said lateral sides and they are kept apart by means of struts arranged at different heights between said plates vis-à-vis.

Such a trench shielding system has many disadvantages.

Indeed, the metal plates are bulky and very heavy; this requires the use of a trailer truck for their transportation to the site and a machine equipped with a handling arm (crane, etc.) for loading and unloading the truck and for placing them in the trench. which has just been dug. As a result, a large number of metal plates and braces are generally delivered at one time to the site and stored on this site to avoid significant transport costs.

The establishment of metal plates in the trench is also very difficult when this trench is congested by existing networks since it is advisable to place said plates on each side of the existing networks and sometimes between these existing networks.

Furthermore, these metal plates are difficult to install when the trench has a difference in level.

In addition, once the metal plates and the struts are in position in the trench, the operator's workspace is heavily congested by the struts, which complicates the movements of the operator and the laying of conduits, pipes, sleeves or other, in this trench.

The following prior art are known, disclosing trench shielding systems: EP3103925A1; EP2246480A1; FR2594865A1; JPS5152507U; US7258511B1;

EP0030622A1; and FR2393889A1. Among these prior art, we will notably note the European patent applications EP3103925 A1 and EP2246480A1 and the French patent application FR2594865A1.

European patent application EP3103925A1 discloses a shielding system with two shoring panels on each of said lateral sides of the trench. Each shoring panel comprises two uprights at its lateral ends, each upright comprising a first profile and a second profile. Each shoring panel comprises boards arranged horizontally one below the other and fixed to the first two profiles of the two uprights. The second profiles of the uprights receive the ends of struts for pressing the shoring panels on the side walls of the trench. The shielding system according to EP3103925A1 can be used as described above when the trench is not too deep. On the contrary, for deeper trenches, the shielding system provides in addition on each of the shoring panels two crosspieces spaced from one another and pivotally mounted with respect to the two second sections on the two uprights, so as to pivot them either in a storage position where said crosspieces are retracted in the boards on the shoring panel - if used with a shallow trench - or in a position of use where said crosspieces are spaced apart -to the planks so that said spacing allows the introduction of shielding parts inside said shoring panel - in case of use with a deep trench. The shoring panels have a sharp edge at their lower edge in order to facilitate their descent into the bottom of the trench by scraping the side walls of this trench against which said shoring panels are pressed. The shoring panels are placed in the bottom of the trench.

European patent application EP2246480A1 discloses a system for shielding a trench which comprises two plates arranged respectively on the side walls of the trench and held in abutment against said side walls by means of struts. Each plate comprises two boards extending longitudinally, the first of which bears against the side wall of the trench and the second is spaced with respect to the first, said spacing allowing the introduction of blades in the vertical direction. French patent application FR2594865A1 discloses panels each consisting of uprights arranged vertically and regularly spaced from each other, these uprights being secured to each other by means of two crosspieces welded to said uprights. The end posts each have a telescopic leg which can be partially pushed into the bottom of the trench. Braces rest on the end posts to hold the panels. Armor pieces are placed between the uprights in the spaces left between the side wall of the trench and the sleepers. The insertion of the uprights between the shielding pieces reveals gaps between these shielding pieces in the lower part of the shielding system, the side walls of the trench being capable of collapsing at said spacings.

These shielding systems described in EP3103925 A1, EP2246480A1 and FR2594865 A1 remain large and impossible to transport and handle by an operator, without transport truck and without handling equipment. It is also impossible to easily adapt them to the length of the trench. Summary of the invention

The present invention overcomes these various aforementioned drawbacks of the prior art.

A first objective is to allow the transport of the armor system in a van and its handling and assembly in the trench, manually.

A second objective is to ensure easy installation of the shielding system in a trench congested by existing networks and which may have elevation differences.

A third objective is to facilitate the implementation of a guardrail around the trench in order to prevent people from falling into it.

A fourth objective is to allow its adaptation to different trench heights.

The invention relates to a system for shielding a trench, the trench comprising in particular two lateral sides and a bottom. The shielding system comprises: a) on each lateral side of the trench, at least two piles each provided with a body, a lower end portion of which is configured to be driven into the bottom of the trench so as to maintain said pile vertically and adjoining said lateral side, the two piles being spaced from each other on said lateral side. b) on each lateral side of the trench, at least two cross-members arranged with a spacing between them at two different heights in the trench, each cross-member being held by the two piles which each have for this purpose means for receiving this cross-member, said crosspieces being maintained with a spacing with respect to the lateral side of the trench, c) on each lateral side of the trench, shielding pieces extending vertically over a length greater than the spacing between the two crosspieces, said shielding pieces being contiguous to each other and positioned in the space left between the lateral side of the trench and the two sleepers, d) at least one strut extending transversely and configured to bear against the sleepers or against the piles arranged facing each other on the two lateral sides of the trench, said strut being placed in the upper parts of the c lateral sides of the trench, so as to keep these spaced sleepers or piles.

The number of piles on each lateral side of the trench will depend on the length of the trench, at least two crosspieces being arranged between each pair of neighboring piles. The number of sleepers will depend in particular on the height of the trench and / or the possible passage of existing networks through the trench. The type of terrain (stable or unstable) can also influence the number of sleepers.

Preferably, the number of struts corresponds to the number of piles arranged opposite each other on the lateral sides of the trench, so that these struts are arranged in abutment either directly against these piles arranged opposite or against the crosspieces above the level of said piles arranged opposite.

Those skilled in the art will understand that thanks to this implementation, the shielding system is made up of piles, crosspieces, shielding pieces and braces which are all independent of each other and assembled together in a removable manner, said shielding system thus comprising no heavy and bulky part, which facilitates its transport in a small van-type vehicle and its manual manipulation by an operator. In addition, the lengths of the crosspieces and the widths of the shielding parts can advantageously be determined to optimize such transport in a van and manually. According to one embodiment, the shielding system comprises on each lateral side of the trench, an upper cross member, a lower cross member and at least one intermediate cross member. This will be particularly the case for deeper trenches or congested by existing networks. This will also be the case for trenches made in unstable ground.

According to one embodiment, adapted in particular to trenches congested in their upper part or in their lower part by existing networks, the shielding system comprises: a) an upper cross member, a lower cross member and an intermediate cross member, b) first pieces of shielding which extend vertically over a length greater than the spacing between the upper and lower crosspieces and, c) second shielding pieces which extend vertically over a length greater than the spacing between the upper and intermediate crosspieces, when the existing networks are arranged in the lower part of the trench, or between the intermediate and lower sleepers, when the existing networks are arranged in the upper part of the trench.

According to another embodiment, adapted in particular to trenches congested in their intermediate part by existing networks, the shielding system comprises: a) an upper cross member, a lower cross member, an upper intermediate cross member and a lower intermediate cross member, b) first shielding pieces which extend vertically over a length greater than the distance between the upper cross member and the upper intermediate cross member, c) second shielding pieces which extend vertically over a length greater than the distance between the intermediate cross member lower and the lower cross member, d) and possibly, depending on the spacing between the two piles and according to the size of the existing networks, third shielding pieces which extend vertically over a length greater than the spacing between the upper cross member and the bottom rail.

Those skilled in the art will understand that the presence of existing networks is no longer a constraint in the implementation of the shielding system, unlike the prior art which uses large metal plates. According to one embodiment of the shielding system, at least one strut is positioned at the piles arranged opposite on the two lateral sides of the trench. In addition, these piles include passage means configured to allow said strut to bear against the facing crosspieces on the two lateral sides of the trench.

According to one embodiment, the shielding system comprises as many struts as piles arranged on each lateral side of the trench.

According to one embodiment of the shielding system, the shielding parts are in the form of blades and / or plates. Blades will be preferred, in particular to limit the weight and for areas of the trench congested by existing networks; however, it is possible to envisage plates of limited width and weight for transporting them manually and in a van.

According to one embodiment of the shielding system, the piles comprise first means for adjusting their length. This allows the length of the piles to be adjusted according to the height of the trench. Of course, the piles can all be adjusted to the same length or to different lengths according to the variations in depth of the trench or possibly according to the existence of elevation differences. Preferably, these adjustment means are of the telescopic type; in other words, the body is composed of at least two parts slidably mounted between them and which can be locked in at least two length adjustment positions thanks to a locking system. One or more complementary parts could be provided, designed to be successively fitted onto the body in order to modify the length of the pile.

According to an embodiment of the shielding system, each pile comprises at its upper end a reinforced head. This makes it easier to drive the pile in using a hammer or a construction machine.

According to one embodiment of the shielding system, the piles each comprise a support bar configured to constitute an extension of the body outside the trench, once the pile is inserted into the trench. In addition, the shielding system comprises guardrail bars, assembly means being arranged between the support bars on the piles and the ends of the guardrail bars. Thus, the shielding system allows a simple and fast implementation of railing equipment linked to the piles. Preferably, according to this abovementioned embodiment, the support bar is mounted telescopically in the body, which makes it possible to keep it permanently on the pile, in a retracted position, then to take it out in a position of use when the installation of railing equipment. In a variant, provision could be made to fit the support bar by fitting onto the upper end of the body, at the time of fitting the railing equipment.

Preferably, according to this abovementioned embodiment, the railing bars comprise second means for adjusting their length, which makes it possible to adjust their lengths as a function of the position of placement of the piles in the trench. These adjustment means can be of the telescopic type, the railing bar being in this case composed of at least two parts mounted to slide between them and which can optionally be locked in at least two length adjustment positions thanks to a system of locking. One or more complementary railing tubes could be provided which are designed to fit one after the other in order to modify the length of the railing bar.

According to a first embodiment of the shielding system, the receiving means on the piles consist of angled legs arranged on a front face of the body and configured to receive a portion of a cross member. Preferably, the shape of the square bracket is adapted to the thickness of the cross member, so as to allow the sliding of the cross member in a plane perpendicular to the front face of the pile, while retaining sufficient play of the housed cross member. in the square bracket, which will facilitate the installation, removal and movement of the cross member while ensuring proper maintenance of the latter in position in the square bracket, this despite the possible flatness of the walls on the lateral sides of the trench.

According to a second embodiment of the shielding system, the receiving means on the piles are constituted by a light arranged along the length of the body and configured to allow the passage of a crosspiece in the body and by stop pieces passing through the light and ensuring that the crosshead is kept high in the light. The light passes through the body in the lateral direction and includes a thickness adapted to the thickness of the crosspieces, which makes it possible to slide the crosspieces into the body, inside the light, while retaining sufficient clearance making it possible to compensate for the flatness of the walls on the lateral sides of the trench. In addition, the abutment parts, for example pins or pins, which are arranged at different heights along the lumen, provide a retention of the crosspiece at the height of engagement thereof in the body. According to one embodiment, the shielding system comprises at least one wedge arranged transversely in the bottom of the trench and configured to bear against the lower end portions of two piles disposed opposite each other on the lateral sides of the trench. These wedges participate in the shoring of the piles without cluttering the trench, given their positioning in the bottom of this trench. These wedges will be particularly used when the trenches are made on unstable ground.

According to one embodiment, the sleepers also comprise means for adjusting their length which may be of the telescopic type or of the fitting type, as previously for the pile body or for the railing bar.

According to one embodiment, the shielding system comprises angled reception means configured to be removably placed on two piles disposed opposite one another on the lateral sides of the trench, at a longitudinal end of said trench, and for receiving at least two sleepers arranged transversely in the trench while maintaining a spacing with respect to said longitudinal end in order to allow the placement of shielding pieces in said spacing and their maintenance by said at least two transverse sleepers. As a variant, it would be possible to implement the shielding system on the longitudinal ends of the trench, in the same way as the implementation on the lateral sides of this trench, that is to say by driving two spaced apart piles one from the other and bearing against the longitudinal end of the trench, these two piles receiving said at least two transverse crosspieces.

Brief description of the figures

The characteristics and advantages of the invention will appear on reading the following description based on figures, among which:

Figure 1 illustrates, in cross section, a shielding system implemented in a trench;

Figure 2 illustrates one side of the shielding system in place on a lateral side of a trench;

Figure 3 illustrates a first design of a stake;

Figure 4 illustrates a second design of a length adjustable pile;

Figures 5 to 7 illustrate a third design of a pile adjustable in length and incorporating a support bar for a railing bar;

Figure 8 illustrates a cross member adjustable in length; Figure 9 illustrates a railing bar adjustable in length;

Figures 10 and 11 illustrate a fourth design of a stake provided with a light and abutment parts;

FIG. 12 illustrates a variant on one side of the shielding system installed on a lateral side of a trench and using piles according to FIGS. 10 and 11;

FIG. 13 illustrates a cross-sectional view of a shielding system implemented in a trench, the shielding system also being arranged at the longitudinal ends of the trench,

Figures 14 to 17 highlight a preferred design of reception means at right angles to the shielding system.

detailed description

In the following description, the same references are used to designate the same characteristics or their equivalents, according to the various variant designs.

In the following description, the terms "front", "rear", "upper", "lower", "top", "bottom", "lateral", transverse "," longitudinal "," vertical "," horizontal ... will be used in consideration of the location of each of the elements in the trench.

In FIG. 1, the shielding system 1 is placed in a trench 100 which extends in length and comprises a first lateral side 101, a second lateral side 102, a bottom 103 is two longitudinal ends of which only one 104 ( that in the background) is shown in FIG. 1. The shielding system 1 is arranged between at least the two lateral sides 101, 102 of the trench 100.

As illustrated with reference to FIGS. 1 and 2, on each of the lateral sides 101, 102 of the trench 100, the shielding system 1 comprises piles 2 each having a body 3 of longitudinal shape extending vertically and of which a lower part 3a is pressed into the bottom 103 of the trench 100; the rear faces 4 of the piles 2 are in abutment against the lateral sides 101, 102. For this, as shown in FIGS. 3 to 7, 10 and 11, the lower part 3 a comprises a sharpened part 5, for example a spade or a point, facilitating its insertion into the bottom 103 of the trench 100 by pushing it by means of a mass or a construction machine used to dig said trench 100. To effect this digging, the body 3 comprises in the upper part 3b a reinforced head 6 intended to be struck by the mass or pushed with the bucket of the construction machine. As illustrated in FIGS. 1 and 2, the shielding system 1 comprises cross members 7 to 11 which extend lengthwise of the lateral sides 101, 102 of the trench 100, between two neighboring piles 2, while retaining a slight spacing (not shown) between the crosspieces 7 to 11 and said lateral sides 101, 102 which are contiguous to them. This spacing allows the passage of shielding pieces 12 to 14 which make it possible to consolidate said lateral sides 101, 102 in order to avoid their possible collapse. The piles 2 are used to hold the cross members 7 to 11, as will be detailed later.

As shown in FIG. 2, only a lower cross member 7 and an upper cross member 8 can be arranged between two neighboring piles 2, which will generally be the case in the areas of the trench 100 that are not congested by existing networks 200. In this case, the shielding pieces 12 extend in length over the entire height of the trench 100 to be held only by the lower cross member 7 and the upper cross member 8. As shown in Figure 1, we can also set up a cross lower 7, an upper cross 8 and an intermediate cross 11, when the trench 100 is deeper or when the ground is soft. The shielding parts 12 have the shape of a blade, but one could provide plates, wider than the blades, taking care however to limit their weight and their width in order to be able to handle them manually and transport them in a van.

As shown in Figure 2, in the areas of the trench 100 congested by existing networks 200, a lower cross member 7, an upper cross member 8, a lower intermediate cross member 9 and an upper intermediate cross member 10 are disposed between the two neighboring piles 2 These two neighboring piles 2 are each disposed on one side of the existing networks 200. The lower intermediate cross member 9 is arranged just below the existing networks 200 and the upper intermediate cross member 10 is arranged just above said existing networks 200. In addition, blades 12 extend over the entire height of the trench 100 and are arranged on the lateral sides of the existing networks 200, lower blades 13 extend in height, from the bottom 103 of the trench 100 to the networks existing 200 and upper blades 14 extend in height, existing networks 200 to the top of the trench 100.

As illustrated in FIG. 1, struts 15 are arranged in the upper part of the trench 100 so as not to hinder the movements of the operator 300 in the trench 100. These struts 15 are supported on the two parts 1a, 1b of the shielding system 1 which are arranged opposite. Preferably, the struts 15 are supported on the ends 8a or 8b of the upper cross member 8 at the locations corresponding to the positions of the piles 2, as will appear in more detail below. However, these struts 15 could be placed in other places against the upper crosspieces 8 or directly against the piles 2.

As illustrated in FIG. 1, it is also possible to provide a wedge 16, the ends l6a, l6b of which bear against the lower parts 3 has bodies 3 of the piles 2 arranged opposite each other in the trench 100. This wedge 16 is buried in the bottom 103 of the trench and intended to remain there during the filling of the trench 100; one could also place the wedge 16 on the bottom 103 of the trench 100, as a variant, in order to recover it before the filling.

According to a first variant of the pile 2, illustrated in FIGS. 3 to 7, the latter comprises lugs 17 in the form of a hook or square which extend towards the front of the front face 18 of the body 3 and upwards . This hook or square shape is adapted to the thickness of the crosspieces 7 to 11, as illustrated in FIGS. 3 and 4, so as to allow the crosspieces 7 to 11 to slide in a plane parallel to the front face 18 of the body 3, with a slight play of the crosspieces 7 to 11 housed in said tabs 17 at right angles, this play making it possible to compensate for the flatness of the walls on the lateral sides 101, 102 of the trench 100. As illustrated with reference to FIGS. 6 , 16 and 17, the square part 19 of each leg 17 comprises a notch 20 which is dimensioned to allow the passage of the ends 15 a, 15b of the struts 15 so as to press them against the ends 8a, 8b of the upper cross member 8, as previously explained.

In FIG. 4, the body 3 of the pile 2 comprises two parts 21, 22 which are slidably mounted between them in order to allow an extension in height of the pile 2 to adapt it to the height of the trench 100. This avoids having different lengths of piles 2 with a body 3 in one piece. These two parts 21, 22 will be locked in position once the adjustment has been made, by means of a locking key 23 shown diagrammatically in FIG. 4. Various locking keys 23 are possible, for example a locking pin, or an ovalized axis or a pressure screw exerting a clamping force against the nested part 22, or even an axis provided with a bolt engaging in a keeper on the nested part 22. Preferably, the piles 2 extend over a variable length of between one meter and three meters (lm and 3m).

In FIGS. 5 to 7, the pile 2 comprises a body 3 adjustable in length, as previously described for FIG. 4, with in addition a support bar 24 which is mounted telescopically in the upper part 22 of the body 3. This support bar 24 can slide in part 22 from a retracted position, illustrated in FIG. 7, to a position of use, illustrated in FIGS. 5 and 6. In the position of use, the support bar 24 is positioned outside of the trench 100. One or more positions of use can be provided; in the case of several positions of use, the support bar 24 will be adjustable in height and a locking key (comparable to the locking key 23 described above) will be implemented between said part 22 and the support bar 24. This support bar 24 allows the reception and the maintenance of a railing bar 25, illustrated in FIG. 9, in a horizontal position, the two ends 25 a, 25b of this railing bar 25 being fixed respectively between two support bars 24 extending from two neighboring piles 2. The railing bars 25 are fixed to the support bars 24 by means of an assembly member 26, for example an eyelet 27 on the support bar 24, in which is housed an anchoring head complementary (not shown) arranged on the railing bar 25.

In FIGS. 10 and 11, the pile 2 comprises a body 3 which has a slot 28 which extends longitudinally and is arranged between the rear face 4 and the front face 18 of the body 3. This slot 28 opens onto the lateral sides 2a , 2b of the pile 2 and has a width slightly greater than the thickness of the crosspieces 7 to 11, which makes it possible to introduce the crosspieces 7 to 11 into the thickness of the body 3, as shown in FIG. 12. In FIG. 10, the pile 2 comprises axes 29 arranged at different heights on the body 3 with regular spacing and greater than the width of the crosspieces 7 to 11, which makes it possible to introduce said crosspieces 7 to 11 between two axes 29 nearby. In FIG. 11, the pile 2 comprises pins 30 which are received in holes 31 arranged in the thickness of the body 3. The holes 31 are spaced apart from each other regularly, as for the axes 29 above. This makes it possible to position only pins 30 in the holes 31 at the desired heights for positioning the crosspieces 7 to 11. This implementation of the pile 2 facilitates the installation of the shielding system 1 in trenches 100 having a drop, as shown in Figure 12, since it is possible to tilt the crosspieces 7 to 11 while keeping them properly on the piles 2.

The front face 18 on the body 3 of the pile 2 of Figures 10 and 11 will preferably include a second light (not shown) which opens on the light 28 and whose width will allow the ends 15 a, 15b of the struts 15 to pass through. across the front face 18 of the body 3, to come directly to bear against the crosspieces 7 to 11.

In FIG. 12, it can be seen that networks 400 can be arranged directly between a lower cross member 7 and an upper cross member 8. It is also possible to have blades 12 au- above networks 500, the lower cross member 7 being disposed above said networks 500. It is also possible to provide only an upper cross member 8 above the existing network 200 and no upper intermediate cross member 10, unlike the illustration in FIG. 2 , while a lower intermediate cross member 9 is provided, the blades 14 being short and held only by the upper cross member 8 and the blades 13 being held by the lower cross member 7 and the lower intermediate cross member 9. It is also possible to provide cross members 7 to 10 without having blades 13 or 14 below and above the networks 600 when these networks 600 are very bulky, in which case these crosspieces 7 to 10 will participate directly in the reinforcement of the walls on the lateral sides 101, 102 of the trench 100.

Other characteristics can be envisaged in the context of the invention.

In FIG. 8, the crosspieces 7 to 11 consist of a main part 32 and of an extension piece 33 which can fit onto the main part 32 in order to increase its length. One could also provide a sliding assembly, of the telescopic type, between the main part 32 and the extension part 33 to adjust the length of the crosspieces 7 to 11 at the spacing between the two neighboring piles 2 receiving said crosspieces 7 to 11.

In FIG. 9, the railing bar 25 consists of a main bar 34 and an extension bar 35 between which is arranged a sliding assembly, of the telescopic type, in order to adjust its length to the spacing between the two support bars 24 receiving the ends 25a, 25b of the railing bar 25. One could also provide an interlocking between the main bar 34 and the extension bar 35, as a variant.

In FIG. 13 is illustrated a shielding system 1 in a trench 100, as in FIG. 1. This FIG. 13 illustrates, in addition, blades 12 'and lower crosspieces 7' and upper 8 'which are arranged at the end. 104 of the trench 10. Thus, the trench 100 is also reinforced at its longitudinal ends 104. The implementation of the shielding system 1 at this end 104 of the trench 100 can be done on the same principle as previously , for the lateral sides 101, 102 of this trench 100. However, according to a preferred embodiment illustrated with reference to FIGS. 14 to 17, the shielding system 1 comprises assembly parts 36 participating in the reception at right angles to the sleepers lower 7 'and upper 8' which extend transversely in the trench 100 at its end 104. These lower crosspieces 7 'and upper 8' are held square screws of the lower 7 and upper 8 crossmembers arranged on the lateral sides 101, 102 of the trench 100. As illustrated with reference to FIGS. 14 to 16, the connecting piece 36 comprises a body 37 which extends longitudinally over a length corresponding substantially to the length of the body 3 of the pile 2. The connecting piece 36 is fixed on the 'one of the lateral sides 2a, 2b of the pile 2; for this, the connecting piece 36 comprises on its front face 38 two anchoring heads 39 which engage respectively in eyelets 40 arranged on the upper and lower parts of the lateral sides 2a, 2b of the pile 2, like this also appears in FIGS. 4 and 5. Only the eyelets 40 on the lateral side 2b of the pile 2 are illustrated, but identical eyelets are provided on the other lateral side 2a. The eyelets 27 on the support bar 24 and the anchor heads (not shown) on the railing bar 25, as mentioned above, will preferably be of similar designs to these eyelets 40 and anchor heads 39 on the body 3 of pile 2 and on assembly part 36.

As illustrated with reference to FIGS. 16 and 17, once the connecting part 36 is anchored on the pile 2, the body 37 of the anchoring part 36 is spaced from the body 3 of the pile 2, which makes it possible to accommodate the crosspieces lower 7 'and upper 8' between the piles 2 arranged facing each other near the end 104 of the trench 100 and the connecting pieces 36 anchored respectively on these two piles 2. In addition, these lower crossmembers 7 'and upper 8 'are arranged transversely in the trench 100 and they rest respectively on the ends 7b, 8b of the lower 7 and upper crosspieces 8 which are arranged longitudinally in said trench 100 and which are supported by the piles 2. The lower crosspieces 7' and upper 8 'are held transversely with a spacing 41 relative to the end 104 of the trench 100, which makes it possible to accommodate the blades 12' there.

Variants of assembly part 36 are possible; one could for example provide on the front face 38 of the body 37 of angled legs of a design similar to the legs 17 of angled arranged on the body 3 of the pile 2, according to the variants of Figures 3 to 7. One could also provide a light similar to light 28 on the body 3 of the pile 2, according to the variants of FIGS. 10 and 11.

Preferably, the piles 2, the support bars 24 and the connecting pieces 36 are made of materials chosen from aluminum, steel or resins. Preferably, the crosspieces 7 to 11 and the blades 12 to 14 are made of materials chosen from aluminum, steel, wood or polymers. Preferably, the railing bars 25 are made of a material chosen from wood, polymers or aluminum. Of course, these choices of materials are not limiting.

Claims

1. Shielding system (1) of a trench (100), the trench comprising in particular two lateral sides (101, 102) and a bottom (103), said shielding system being characterized in that it comprises:

a) on each lateral side of the trench, at least two piles (2) each provided with a body (3), a lower end portion (3a) of which is configured to be driven into the bottom of the trench so as to maintain said pile vertically and adjacent to said lateral side, the two piles being spaced from each other on said lateral side,

b) on each lateral side of the trench, at least two crosspieces (7 to 11) arranged with a spacing between them at two different heights in the trench, each crosspiece being held by the two piles which each have for this purpose means of reception of this cross member, said cross members being maintained with a spacing with respect to the lateral side of the trench,

c) on each lateral side of the trench, shielding pieces (12 to 14) extending vertically over a length greater than the spacing between the two crosspieces, said shielding pieces being contiguous to each other and positioned in the spacing left between the lateral side of the trench and the two crosspieces, d) at least one strut (15) extending transversely and configured to bear against the crosspieces or against the piles arranged opposite on the two lateral sides of the trench, said strut being placed in upper parts of the lateral sides of the trench, so as to keep apart these crosspieces or piles.

2. Armor system (1) according to claim 1, which comprises on each lateral side (101, 102) of the trench (100), an upper cross member (8), a lower cross member (7) and at least one intermediate cross member (9 to 11).

3. Shielding system (1) according to claim 2, which comprises:

a) an upper cross member (8), a lower cross member (7) and an intermediate cross member

(9)

b) first shielding pieces (12) which extend vertically over a length greater than the spacing between the upper (8) and lower (7) crosspieces and, c) second shielding pieces (13, 14) which extend vertically over a length greater than the spacing between the upper (8) and intermediate crosspieces

(10) or between the intermediate (9) and lower (7) crosspieces.

4. Shielding system (1) according to claim 2, which comprises:

a) an upper cross member (8), a lower cross member (7), an upper intermediate cross member (10) and a lower intermediate cross member (9),

b) first shielding parts (14) which extend vertically over a length greater than the distance between the upper cross member (8) and the upper intermediate cross member (10),

c) second shielding pieces (13) which extend vertically over a length greater than the distance between the lower intermediate cross member (9) and the lower cross member (7).

5. Shielding system (1) according to any one of claims 1 to 4, in which the at least one strut (15) is positioned at the piles (2) arranged opposite on the two lateral sides (101, 102) of the trench (100), said piles comprising passage means (20) configured to allow said strut to bear against the crosspieces (8) facing each other on the two lateral sides of the trench.

6. Shielding system (1) according to any one of claims 1 to 5, which

comprises as many struts (15) as piles (2) arranged on each lateral side (101, 102) of the trench (100).

7. Shielding system (1) according to any one of claims 1 to 6, in which the shielding parts (12 to 14) are in the form of blades and / or plates.

8. Shielding system (1) according to any one of claims 1 to 7, wherein the piles (2) comprise first means for adjusting their length.

9. Shielding system (1) according to claim 8, wherein the first adjustment means are of the telescopic type.

10. Armor system (1) according to any one of claims 1 to 9, in which each pile (2) comprises at its upper end a reinforced head (6).

11. Shielding system (1) according to any one of claims 1 to 10, in which the piles (2) each comprise a support bar (24) configured to constitute an extension of the body (3) outside the trench. (100), said shielding system comprising railing bars (25), assembly means being arranged between the pile support bars and the ends (25a, 25b) of the railing bars.

12. Shielding system (1) according to claim 11, in which the support bar (24) is mounted telescopically in the body (3).

13. Shielding system (1) according to any one of claims 11 or 12, in which the railing bars (25) include second means for adjusting their length (34, 35).

14. Shielding system (1) according to any one of claims 1 to 13, in which the receiving means on the piles (2) consist of angled lugs (17) arranged on a front face (18) of the body (3) and configured to receive a portion of a crosspiece (7 to 11).

15. Shielding system (1) according to any one of claims 1 to 13, in which the receiving means on the piles (2) are constituted by a light (28) arranged along the length of the body (3) and configured to allow the passage of a cross (7 to

11) and by stop pieces (29, 30) passing through the lumen and ensuring that the crosshead is kept high in the lumen.

16. Shielding system (1) according to any one of claims 1 to 15, which comprises at least one wedge (16) arranged transversely in the bottom (104) of the trench (100) and configured to bear against the parts lower ends (3 a) of two piles (2) arranged opposite on each of the lateral sides (101, 102) of the trench (100).

17. Shielding system (1) according to any one of claims 1 to 16, which comprises angle receiving means (36) configured to be removably placed on two piles (2) arranged opposite on the lateral sides (101,

102) of the trench (100), at one longitudinal end (104) of said trench, and for receiving at least two crosspieces (7 ', 8') arranged transversely in the trench while maintaining a spacing (41) relative to said end (104) in order to allow the placement of shielding pieces (12 ') in said spacing and their maintenance by said at least two transverse crosspieces (7', 8 ').