FR3039412A1 - FALL PROTECTION SYSTEM OF A PERSON INTERVENING ON A GROUND-BASED RECEPTION STRUCTURE - Google Patents

Abstract

The present invention relates to a fall protection system of a person working on a ground-based reception structure. According to the invention, the system is characterized in that it comprises at least one vertical pole (10) removably attached to the host structure (1) to a pre-existing part (3) integral with the host structure (1) and which is anchored directly to the lanyard (9) at an anchoring height providing sufficient air draft in the event of a fall in height of the person. The invention finds application in the field of personal fall protection on gas tanks.

Description

The present invention relates to a fall protection system of a person involved in a reception structure resting on the ground at a predetermined height.

Such a fall protection system allows people involved in height on the host structure to ensure when moving on this structure.

For this purpose, the fall protection system comprises personal protective equipment called EPI, which comprises a harness worn by the person and connected to an anchoring device of the home structure via a lanyard provided, where appropriate, with an energy absorber or via a cable reel in the event of a fall in the height of the person.

The anchoring device may be constituted by a fixed anchor point or a horizontal lifeline to stretched steel wire or rail, allowing movement of the person involved on the host structure.

When you want to install such a fall protection system for personal protection, we often face the problem of air draft too low, that is to say, the fall height is too low for the lanyard with the energy absorber to stretch and absorb energy from the fall before the person touched the ground.

Such a problem arises especially for a too low reception structure such as for example a cylindrical gas tank, which has at its top two anchor rings intended to move it, but which can not be used directly point anchorage for personal protective equipment.

A solution to solve the problem of too low drop height is to raise the anchor above the level of movement of the person involved in the host structure, but this solution has the disadvantage of significantly reduce the size of the loin and the height of the fall.

The present invention aims to overcome the above drawbacks by providing a solution to which the air draft satisfies the condition where it must be less than the height between the anchor and the ground or the nearest lower obstacle, in particular for a reception structure that is too low, such as a cylindrical gas tank.

For this purpose, according to the invention, the fall protection system of a person working on a reception structure resting on the ground at a given height and comprising an anchoring device integral with the home structure, a harness worn by the person and connected to the anchoring device by means of a lanyard, is characterized in that the anchoring device comprises at least one vertical post removably attached to the host structure to a pre-portion -existing solidarity of the host structure and which is anchored, directly or indirectly, the lanyard at an anchor height ensuring a sufficient air draft in case of drop in height of the person.

According to a first embodiment, the anchoring device comprises a single vertical pole at the upper end of which is directly attached to the lanyard and whose lower end comprises a yoke removably attached to a ring constituting the pre-existing part of the reception structure and in that the lower part of the vertical pole comprises at least three remote feet resting on the reception structure, at least one of the remote feet having its end resting on the adjustable reception structure in height so as to exert on the deported feet a pressure force maintaining them on the support structure and on the pole a vertical pulling force upwards.

Advantageously, each remote foot has its end resting on the height-adjustable reception structure.

Preferably, the end of each remote foot comprises a support pad of elastomeric material, the height adjustment means of an end of a remote foot comprises a screw through the end of the deported and integral foot foot pad.

According to a second embodiment, the anchoring device comprises at least two vertical poles aligned on the host structure in the same vertical plane, a horizontal beam supported by the upper end portions of the two vertical poles and a lifeline with a cable or rail fastened under the horizontal beam and to which the life line is anchored, by means of a carabiner, the lanyard connected to the harness by the intervener and that the end of each vertical post is attached to a ring constituting the pre-existing part of the reception structure and the lower part of the vertical post comprises at least three remote feet resting on the reception structure, at least one of the deported feet having its end resting on the height-adjustable reception structure so as to exert on the deported feet a compressive force keeping them resting on the reception structure and on the pole a vertical pulling force upwards.

Advantageously, each remote foot has its end supported on the height-adjustable reception structure.

Preferably, the end of each remote foot comprises a support pad of elastomeric material and the height adjustment means of an end of a remote foot comprises a screw through the end of the deported and integral foot foot pad.

Preferably, the horizontal beam comprises three parallel side rails removably attached to the upper parts of the vertical posts protruding on either side of the latter and the lifeline is stretched between two end plates connected to the two parts d opposite ends of the spars.

Advantageously, each spar comprises several sections two by two assembled coaxially by a connecting sleeve.

Preferably, the host structure is a cylindrical tank, such as "gas type", each ring is attached to the top of the cylindrical tank in a vertical plane and the offset legs of each vertical pole are supported on the arcuate outer surface of the cylindrical tank.

Advantageously, the horizontal beam and the lifeline extend parallel to the tank over a length substantially equal to that of the tank.

The lanyard comprises an energy absorber in the event of a fall in height of the person.

Alternatively, the lanyard is constituted by a cable or a strap of a winder attached to the anchoring device with the cable or the strap connected to the harness of the person.

The invention will be better understood, and other objects, features, details and advantages thereof will appear more clearly in the explanatory description which follows with reference to the accompanying drawings given solely by way of example illustrating two Embodiments of the invention and in which: - Figure 1 is a perspective view of the fall protection system of a person involved in a cylindrical gas tank according to a first embodiment of the invention; - Figure 2 is an enlarged view of the circled portion II of Figure 1; - Figure 3 is an enlarged view of the circled portion III of Figure 1; - Figure 4 is a perspective view along the arrow IV of Figure 1; FIG. 5 is an enlarged view of the V-circled portion of FIG. 4; - Figure 6 is an end view along the arrow VI of Figure 4; - Figure 7 is a perspective view similar to that of Figure 1 and showing the person who fell from the tank; - Figure 8 is an enlarged end view along the arrow VIII of Figure 7; FIG. 9 is a perspective view of a fall protection system of a person working on a cylindrical gas tank according to a second embodiment of the invention; - Figure 10 is a side view along the arrow X of Figure 9; - Figure 11 is an end view along the arrow XI of Figure 9; FIG. 12 is an enlarged view of the circled portion XII of FIG. 9; FIG. 13 is an enlarged view of the circled portion XIII of FIG. 9; FIG. 14 is an enlarged view of the portion circled at XIV of FIG. 9; and - Figure 15 is a perspective view similar to that of Figure 9 and showing the person who fell from the tank.

The fall protection system of the invention will be described to ensure a person involved in a reception structure of a structure at height constituted by a cylindrical tank of gas lying on the ground of a relatively low height compared to other structures at heights, such as, for example, roofs of buildings.

Figures 1 to 8 show a first embodiment of the fall protection system of a person involved in the cylindrical tank 1.

The cylindrical tank 1 rests on the ground via two transverse support legs 2 and has at its top at least two parts forming anchoring rings 3 integral with the arcuate outer face of the tank 1.

The two parts forming anchoring rings 3 are intended to move the tank 1, for example by means of a handling machine, such as a crane on its implantation site shown in particular in Figure 1 .

Each anchoring ring portion 3 comprises a rectangular plate-shaped base 4 fixed, for example by welding, on the tank 1 extending along the top generator of the tank 1.

The anchoring ring portion 3 further comprises a plate 5 in the general shape of isosceles triangle fixed, for example by welding, on the base 4 along thereof.

Each triangular plate 5 has a through hole 6 for anchoring the tank 1 to the handling machine and having another role as will be explained later.

Thus, the two parts forming anchoring rings 3 extend vertically above the top of the tank 1 and are arranged substantially in the same vertical plane.

Figures 1, 4 and 6 show a person P acting on the tank 1 to access various bodies present on the tank 1, such as valves, to perform maintenance operations, such as for example their cleaning.

The fall protection system of the person P comprises an anchoring device 7, which will be defined below, integral with the tank 1, a harness 8 carried by the person P, a lanyard 9 connecting the harness 8 to anchoring device 7 and an energy absorber, not shown, in the event of a fall in height of the person P.

The energy absorber is generally integrated in the lanyard 9 and is deployed during the fall of height of the person P.

Such a system or protective equipment requires precautions for use concerning the air draft in the event of a fall in height.

The air draft is the minimum distance required between the anchor point and the first obstacle and the lower the air draft, the higher the anchor point must be.

The draft is equal to the drop height of the person P to which is added a safety constant, which is a minimum safety distance required between the feet of the operator and the first obstacle after the fall, in this case the soil.

The height of fall is equal to the sum of the length of the lanyard, the absorption distance by the energy absorber and the size of the person P.

In the present case, with reference to FIG. 6, the height between the top of the tank 1 and the ground, fixed for example at 5 meters with a lenght of 2 meters, a distance absorption of 2 meters and the size of the person P of 1.75 meters with safety constant C of 1 meter.

Under these conditions, the height of the air draft will be 6.75 meters (2 meters + 2 meters + 1.75 meters + 1 meter), and the minimum height relative to the top of the tank 1 of the point d Anchoring for optimum safety in the event of a fall will be 1.75 meters (air draft 6.75 meters - height H 5 meters). Of course, these values are given only by way of example.

To meet the above requirements of the air draft, the anchoring device 7 comprises a vertical pole 10 removably attached to one of the anchor ring portions 3 of the tank 1 and at the end upper of which is anchored directly to the lanyard 9 via a carabiner, not shown.

The height of the pole relative to the top of the tank 1 must thus provide a sufficient air draft in the event of a fall in height of the person P, to prevent the latter from hitting the ground at the end of this fall. In the values given above by way of example, the height of column 10 will be 1.75 meters.

The lower end of the vertical pole 10 comprises a yoke 11, whose two parallel branches 12 in the form of rectangular plates are in extension of the lower end of the pole 10 of square section.

The yoke 11 of the post 10 is removably attached to the triangular plate 5 of the anchoring ring portion 3 by means of a locking pin, not shown, which may be constituted for example by a bolt passing through the holes 13 of the branches 12 of the yoke 11 and the bore 6 of the triangular plate 5 disposed between the two branches 12.

The diameter of the bore 6 of the triangular plate 5 is greater than the diameter of each bore 13 of a branch 12.

The lower part of the vertical pole 10 comprises three remote feet 14 resting on the arcuate outer face of the tank 1.

As shown, two of the remote feet 14 have at their ends respectively two rectangular pads of elastomeric material 15 integral with these ends and bearing on the outer face of the tank 1 on the same side thereof, while the other remote foot 14 comprises a screw 16 passing through the free end of this foot and having at one of its ends being integral therewith a circular pad 17 of elastomeric material resting on the external face of the tank 1 opposite the other two deported feet 14.

The screw 16 comprises, at its end opposite the pad 17, a bore 18 allowing the passage of an axis to maneuver the screw 16 to adjust the support height of the end of the remote foot 14 relative to the external face of the tank 1. The adjusting screw 16 can pass through two nuts 19, of which only one shown, integral on either side of the end of the remote foot 14 and for locking the screw 16 once set at its height of support of the end of this foot.

If necessary, a reinforcing arm 20 can be fixed between each remote foot 14 and the lower end of the vertical pole 10. The reinforcing arms 20 extend in a substantially horizontal plane while the remote arms 14, which are inclined relative to the post 10, have their ends opposite to those resting on the tank 1 integral with the lower end portion of the vertical pole 10. The fastenings of the remote arms 14 and the reinforcing arms 20 to the vertical post 10 and that those of the reinforcing arms 20 to the remote arms 14 may be made by welding.

In addition, each anchoring ring portion 3, the vertical post 10, the offset feet 14 and the reinforcing arms 20 may be made of steel.

When the yoke 11 of the post 10 is fixed to the anchoring ring portion 3 and the three offset feet 14 are supported on the arcuate outer face of the tank 1, the adjusting screw 16 is screwed to the the end of the corresponding offset foot 14 until the three offset feet exert on the arcuate outer face of the tank 1 a compressive force causing the vertical pole 10 a vertical pulling force upwards relative to the ring forming part anchoring 3 so as to bring in support the locking or fixing pin of the yoke 11 to the part 3 at the upper edge of the bore 6 of the part 3, ensuring a stable and rigid attachment of the pole 10 on the tank 1.

The mounting of the pole 10 on the tank 1 and its disassembly of the tank 1 can be performed using a nacelle.

The person P can then ensure on the tank 1 by hanging by the lanyard 9 at the upper end of the pole 10 to perform maintenance operations on the tank 1.

Of course, once the maintenance operations performed on a portion of the tank 1, another pole 10 or the same as that used above can be removably attached to the other anchoring ring portion 3 of the tank 1 to allow the person P, once ensured to the pole 10 by the lanyard 9, to carry out maintenance operations on the remaining part of the tank 1 enjoying the same fall protection equipment as previously described.

The installation of each post 10 to ensure a person involved in the tank 1 does not require any modification of the structure of the tank which already has originally the anchor rings 3 parts.

The second remote foot and, where appropriate, the third remote foot 14 may each comprise a set screw 16 and such a height adjustment of each foot offset relative to the tank 1 allows to adapt the fixing of the post 10 on the tank 1 according to the different sizes of each anchoring ring portion 3 and the different diameters of the tank 1.

The post 10 may also include four deported feet instead of three.

Figures 7 and 8 show the person P having dropped from above the tank 1.

It is found that the anchoring point of the lanyard 9 at the upper end of the vertical post 10 is at a height ensuring optimum safety during the fall of the person P, this height being somewhat above the head of the person P.

Figures 9 to 15 show a second embodiment of the fall protection system of the invention.

According to this embodiment, the anchoring device which is ensured by a person working on the tank 1 via the harness 8, the lanyard 9 and the energy absorber in case of a fall in height. of the person P, comprises two vertical posts 10, each substantially identical to the post 10 described above with reference to the first embodiment and which are removably attached respectively to the two parts forming anchoring rings 3 by means of locking pins which may be constituted by bolts each passing through the bores 13 of the two parallel branches 12 of the yoke 11 of a post 10 and the boring 6 of the triangular plate 5 of the corresponding anchor ring part 3.

The two vertical posts 10 are aligned along the generator of the tank 1 and are thus in the same vertical plane.

Each post 10 has at its lower end portion four offset feet 14 instead of three for the pole of the first embodiment and having their free ends resting on the arcuate outer face of the tank 1 and their opposite ends. fixed to the post 10, for example by welding.

Each remote foot 14 comprises in the vicinity of its free end a set screw 16 screwed through this end and having at one of its ends a maneuvering handle 16a and at its opposite end, a support pad circular 17 of elastomeric material secured to this end.

Four reinforcing arms 20 are each fixed, for example, by welding, between the corresponding offset foot 14 and the lower end portion of the post 10.

Two offset feet 14 disposed on either side of the vertical pole 10 extend substantially towards the top generator of the tank 1 while the other two remote feet 14 located on either side of the pole vertical 10 extend substantially transversely to this generator. The two substantially transverse offset feet have a length greater than the other two substantially longitudinal feet 14 offset.

The screwing of each of the screws 16 makes it possible to adjust the compressive bearing force of the ends of the end feet 14 of each post 10 on the tank 1 by means of the pads 17 and, consequently, exert on the post 10 an upward pulling force until the locking pin comes to bear on the upper edge of the bore 6 of the anchoring ring portion 3 as for the pole 10 of the first mode embodiment, thereby ensuring a stable and rigid attachment of each pole 10 on the tank 1.

The anchoring device further comprises a horizontal beam 30 supported by the upper end portions of the two vertical posts 10 and a lifeline cable or rail 31 fixed under the horizontal beam 30.

The lanyard 9 connected to the harness 8 of the person P is anchored by means of a carabiner, not shown, to the lifeline 31 to ensure a horizontal movement of the carabiner along the lifeline 31, and therefore allow the person P to move from one end of the tank 1 to the other because the horizontal beam 30 and the lifeline 31 protrude beyond the two upright vertical poles 10. extending all along the tank 1 by overflowing even from each end of the latter.

The horizontal beam 30 is preferably constituted by three parallel longitudinal members 33, each consisting of several sections 33a assembled end to end.

Two of the longitudinal members 33 are arranged in a substantially horizontal plane above the tank 1 while the third spar 33 is disposed above the other two longitudinal members 33 being located in the vertical median plane of the other two spars 33 .

Thus, the three longitudinal members 33, when considered in cross section, form the three vertices of an equilateral triangle.

Three ends located on the same side of the longitudinal members 33 are respectively engaged in three integral sleeves 34, for example by welding, a face of a connecting plate 35 having the shape of an equilateral triangle.

The three sleeves 34 extend perpendicularly from the face of the plate 35 being located in the vicinity of the three vertices of this plate.

The other three ends located on the same side opposite the plate 35 of the longitudinal members 33 are respectively engaged in three integral sleeves 36, for example, by welding a face of a connecting plate 37 in the shape of an equilateral triangle. The three sleeves 36 extend perpendicularly from the face of the connecting plate 37 and are located in the vicinity of the three vertices of this plate.

The sections 33a of each spar 33 are assembled end to end by means of sleeves 33b in each of which are partially engaged the two end portions of two successive sections 33a of a spar 33.

The two rails 33 located in the substantially horizontal plane are fixed by their respective sections 33a in the upper part of each vertical pole 10 by means of two horizontal support arms 38 located on either side of the pole 10 in one horizontal plane, each arm 38 being fixed to the post 10 for example by welding. More specifically, each section 33a is fixed to the corresponding end of the support arm 38 by means of two fixing flanges 39 respectively a first flange 39 integral, for example, by welding the end of the corresponding support arm 38 and a second flange 39 removably attached to the first flange 39 by means of fixing screws, not shown.

The third spar 33, which is substantially in the same vertical plane passing through the two vertical posts 10, is disposed above the upper free ends of the two vertical posts 10 and is fixed by its corresponding section 33a to the corresponding post 10 by means of two inclined support arms 40 having two of their ends integral, for example by welding, the corresponding vertical pole 10 and on either side of the latter.

Specifically, the two support arms 40 are located substantially in the same vertical plane passing through the corresponding vertical pole 10 extending on either side of the latter in a V configuration. The corresponding section 33a the upper spar 33 is attached to the two upper ends of the two support arms 40 by means of two fastening flanges 41 respectively a first fastening flange 41 integral, for example by welding, the corresponding end of the support arm 40 and a second flange 41 removably attached to the first flange by means of fixing screws, not shown.

The three spars 33 are secured to each other by a parallel series of three connecting arms 42, each fixing one to the other two corresponding sections 33a of two longitudinal members 33 by means of fixing flanges 43 .

The link arms 42 of the series may be evenly spaced along the horizontal beam 30.

The lifeline 31 is constituted in this case by a steel cable which is stretched between the two end link plates 35, 37 at a height somewhat above the head of the person P.

The cable 31 has one of its ends anchored to the end link plate 35 below it by means of a rectangular rigid plate 44 vertically fixed to the face of the plate 35 of which protrude the three sleeves 34. The end of the cable 31 ends in a closed loop hooked in a ring 45 with two parallel branches and secured to the lower end portion of the rigid plate 44. One of the branches of the The attachment ring 45 is in two parts comprising a nut 46 which, when unscrewed, makes it possible to introduce the closed-loop end of the cable 31 between these two parts and which, once screwed to the two parts, makes it possible to block the closed loop end of the cable in the ring 45.

The other end of the cable 31 is fixed to the face of the other end connection plate 37 which project the three sleeves 36 and comprises a tensioning means 47 of this cable.

The ension exerted by the cable 31 allows the sleeves 34 and 36 respectively of the two end link plates 35, 37 to be kept engaged on the corresponding end portions of the longitudinal members 33.

The horizontal cable 31 is located somewhat below the two horizontal side members 33.

The mounting of the anchoring device that is the subject of this second embodiment can be carried out from a nacelle and consists first of all to fix the two poles 10 on the tank 1 by means of parts forming anchoring rings 3 and then fixing the sections 33a of the longitudinal members 33 to the two vertical posts 10. Next, the series of three connecting arms 42 is fixed to the three corresponding sections 33a of the three longitudinal members 33, and the two connecting plates ends 35, 37 are fitted by their respective sleeves 34, 36, on the end portions of the longitudinal members 33.

Finally, the cable 31 constituting the lifeline, one end of which is secured to the connecting plate 37, is hooked to the lower end of the rigid plate 44 of the other end connection plate 35 and the tensioner 47 is maneuvered to tension the cable between the two end link plates 35, 37.

Disassembly from the nacelle of this anchoring device is performed in the reverse order of that previously described for mounting.

The conformation of the horizontal beam 30 in several light sections and assembled to each other and vertical posts 10 facilitates the mounting of this beam unlike a monobloc beam that would be very heavy to install.

Of course, the lifeline 31 could be constituted by a horizontal rail fixed between the two end connection plates 35, 37.

Each post 10 may have only three remote feet 14 bearing on the tank 1 as described with reference to the first embodiment.

In addition, a single, two or three of the four remote feet 14 of the second embodiment may or may comprise a screw 16 for adjusting the support of the corresponding pad 17 on the arcuate outer face of the tank 1.

As for the first embodiment, the offset feet 14 screw 16 of height adjustment of each vertical post 10 can adapt to different sizes of anchor ring portions 3 and different diameters of the tank 1 .

The horizontal beam anchoring device 30 and life line 31 supported by the fixed beam of the vertical posts 10, anchors the lanyard 9 to the lifeline at a height relative to the top of the tank 1 for ensure a draft allowing the person working on the tank 1 not to hit the ground in case of a fall as shown in Figure 15. This figure shows the effect of arrow corresponding to the elongation of the lifeline 31 depending on the weight of the person P. This boom effect must be taken into account when calculating the air draft.

Alternatively not shown, the system of the second embodiment may comprise three or more vertical posts 10 along the tank 1 and respectively fixed to three or more anchor ring portions extending along the upper generator of the tank 1.

According to an alternative embodiment not shown, the lanyard 9 may be constituted by a cable or a strap of a winder attached to the anchoring device either directly to the end of the vertical post 10, or to the lifeline 31 by a carabiner. The cable or the strap of this retractor is connected to the harness of the person P. Such a retractor is a quick release braking means in the event of a fall in height of the person P and stops the fall of this person in a few centimeters.

The above fall protection system described in the two embodiments of the invention can be applied not only to a tank, but also to any other reception structure such as for example a submarine. dry dock or a ship also in dry dock.

Claims (13)

1. Fall protection system of a person (P) acting on a reception structure (1) resting on the ground at a given height and comprising an anchoring device secured to the reception structure (1), a harness (8) carried by the person (P) and connected to the anchoring device by means of a lanyard (9), characterized in that the anchoring device comprises at least one vertical pole (10) removably fixed on the reception structure (1) has a pre-existing part (3) integral with the reception structure (1) and to which is anchored, directly or indirectly, the lanyard (9) at an anchor height ensuring a tie rod; sufficient air in the event of a person falling from a height (P) · 2. System according to claim 1, characterized in that the anchoring device comprises a single vertical pole (10) at the upper end of which is directly attached to the lanyard (9) and whose lower end comprises a yoke (11). ) removably attached to a ring (3) constituting the pre-existing part of the reception structure (1) and in that the lower part of the vertical post (10) comprises at least three remote feet (14) resting on the structure of the home (1), at least one of the deported feet (14) having its end resting on the home structure (1) adjustable in height so as to exert on the deported feet (14) a pressure force the now bearing on the host structure (1) and on the pole (10) a vertical pulling force upwards. 3. System according to claim 2, characterized in that each offset foot (14) has its end bearing on the home structure (1) adjustable in height. 4. System according to claim 2 or 3, characterized in that the end of each remote foot (14) comprises a bearing pad (15,17) of elastomeric material and the means for adjusting the height of an end of an offset foot (14) comprises a screw (16) passing through the end of the remote foot (14) and secured to the support pad (17). 5. System according to claim 1, characterized in that the anchoring device comprises at least two vertical posts (10) aligned on the host structure (1) in the same vertical plane, a horizontal beam (30) supported by the upper end portions of the two vertical posts (10) and a lifeline (31) stretched to a rope or rail fixed under the horizontal beam (30) and to which a life line is anchored, via a carabiner, the lanyard (9) connected to the harness (8) carried by the intervening person (P) and in that the lower end of each vertical post (10) is attached to a ring (3) constituting the pre-existing part of the receiving structure (1) and the lower part of the vertical pole (10) comprises at least three remote feet (14) resting on the receiving structure (1), at least one of the remote feet (14) having its end resting on the height-adjustable reception structure (1) so as to exert on the deported feet (14) a pressure force maintaining them on the support structure (1) and on the pole (10) a vertical pulling force upwards. 6. System according to claim 5, characterized in that each offset leg (14) has its end bearing on the home structure (1) adjustable in height. 7. System according to claim 5 or 6, characterized in that the end of each remote foot (14) comprises a bearing pad (15,17) of elastomeric material and the means for adjusting the height of one end of an offset foot (14) comprises a screw (16) passing through the end of the remote foot (14) and secured to the support pad (17). 8. System according to one of claims 5 to 7, characterized in that the horizontal beam (30) comprises three parallel longitudinal members (33) removably attached to the upper parts of the vertical columns (10) overflowing on either side of these and the lifeline (31) is stretched between two end plates (35,37) connected to the two opposite end portions of the longitudinal members. 9. System according to claim 8, characterized in that each spar (33) comprises several sections (33a) two by two assembled coaxially by a connecting sleeve (33b). 10. System according to one of claims 2 to 9, characterized in that the receiving structure is a cylindrical tank (1), such as gas type, each ring (3) is attached to the top of the cylindrical tank (1) in a vertical plane and the offset feet (14) of each vertical pole (10) bear against the arcuate outer face of the cylindrical tank (1). 11. System according to claim 10 when considered in combination with one of claims 5 to 9, characterized in that the horizontal beam (30) and the lifeline (31) extend parallel to the tank ( 1) over a length substantially equal to that of the tank (1). 12. System according to one of claims 1 to 11, characterized in that the lanyard (9) comprises an energy absorber in the event of a fall in height of the person (P). 13. System according to one of claims 1 to 11, characterized in that the lanyard (9) is constituted by a cable or a strap of a winder attached to the anchoring device with the cable or the strap connected to the harness of the person (P).