WO2020239667A1

WO2020239667A1 - Device and method for anchoring equipment to a civil engineering structure

Info

Publication number: WO2020239667A1
Application number: PCT/EP2020/064390
Authority: WO
Inventors: Thierry ROURE; Clément HERVE; Gaëtan NIEHAUS; Guillaume TREMBLAY
Original assignee: Electricite De France; Framatome
Priority date: 2019-05-29
Filing date: 2020-05-25
Publication date: 2020-12-03
Also published as: FR3096746B1; FR3096746A1

Abstract

The invention relates to a device (100) for anchoring a piece of equipment (EQ) to a civil engineering structure (GC), comprising a plate (5) comprising at least one through-hole (2), a pin (3) intended to rigidly attach the plate (5) to the structure (GC) and a ring (4) of a single piece in order to make a direct connection between the pin (3) and the plate (5) and to be inserted into the through-hole (2), the ring (4) comprising a curved slot (43), that passes through axially and extends at least from the central axis to its radially external edge (42) along a curved guiding trajectory of the pin (3) in a plane that is perpendicular to the central axis, the curved slot (43) being open in the edge (42), as the pin (3) is to be inserted directly into the curved slot (43), the device (100) comprising an unlocking member (8) intended to be positioned on the ring (4).

Description

Device and method for anchoring equipment to a civil engineering structure

The invention relates to a device for anchoring equipment to a civil engineering structure.

The field of application of the invention relates to industrial installations in various sectors such as in particular chemistry, metallurgy, construction, energy production such as, for example, the production of electricity in nuclear, hydraulic and fossil power plants.

Anchoring devices are generally known from documents FR-A-2 744 501, WO 2013/179119 and WO 92/07151.

Document FR-A-2 744 501 relates to a device for clamping a part against a support, the device comprising a circular alignment plate inserted into a bore in the part and having a slot for passing a threaded rod. A washer having a through hole for the threaded rod is disposed on the plate, the washer and the plate having grooves cooperating with each other to prevent radial sliding. A nut is tightened over the washer and around the threaded rod, which is anchored in the bracket and passes through the plate and washer. This device is designed to catch misalignments between the part and the support and to block them.

Document WO 2013/179119 describes a centering device for mounting a part on the ground by means of a bolt. This device comprises a centering washer inserted in the opening of the part, a centering sleeve disposed on the washer. The bolt passes through a hole in the washer and a hole in the socket, the socket and the washer having teeth to lock them together. A nut clamps the socket and washer against the ground.

Document WO 92/07151 describes an alignment device having a plate provided with holes against which are positioned the shoulders of washers having an opening with circular ends, the washer being traversed by a bolt in order to fix the washers to the ground by a nut.

These devices have the drawback of being vulnerable to the shear forces that can be exerted on the structure, for example in the event of earthquakes.

It is in fact sought, particularly in the field of nuclear power plants for the production of electricity, to have an anchoring device which withstands the efforts of shear and maintains the good anchoring of the equipment to the structure in the event of earthquakes.

The invention aims to obtain a device which solves the problem indicated above.

To this end, a first object of the invention is a device for anchoring equipment to a civil engineering structure, the device comprising:

- an equipment support plate, comprising at least one through hole,

- for each through hole, a dowel intended to rigidly fix the plate to the civil engineering structure and a ring in the shape of the same as that of the through hole and intended to be inserted into the through hole,

characterized in that the ring is a single piece having the function of making the direct connection between the pin and the plate,

the ring comprising a central axis, a radially outer edge and a curved slot, axially passing through and extending at least from the central axis to the radially outer edge along a curved guide path of the ankle in a plane perpendicular to the central axis,

the curved slot being open in the radially outer edge,

the ankle being intended to be inserted directly into the curved slot of the ring,

the device further comprising for each through hole a locking member intended to be positioned on the ring.

Thanks to the invention, the curved slot ensures, by abutment of the ankle against one or the other of the curved inner edges delimiting the curved slot, a resumption of the shear occurring during seismic shocks, and this advantageously regardless of the rotational arrangement of the ring and regardless of the direction of the force exerted.

According to one embodiment of the invention, the curved guide path of the curved slot has constant sign of convexity from the central axis to the radially outer edge in the plane perpendicular to the central axis. According to one embodiment of the invention, the curved slot is delimited up to a first inner end by first and second inner edges of the ring, which are spaced from each other by in the plane perpendicular to the 'central axis a first internal width of the curved slot, greater than a second width of a rod of the ankle, the curved slot is extended from the first inner end by a second axially through slot, delimited to a second inner end by third and fourth inner edges of the ring, which are spaced from each other in the plane perpendicular to the central axis by a third width smaller than the second width of the shank of the ankle.

According to one embodiment of the invention, the second slot is extended from the second inner end by an axially through bore, away from the curved slot and having in the plane perpendicular to the central axis a fourth smaller inner width than the second width of the ankle shank and greater than the third width of the second slot.

According to one embodiment of the invention, the through hole in the plate is frustoconical by widening from a rear face of the plate, intended to be turned towards the civil engineering structure, to a front face of the plate, intended to be further from the civil engineering structure than the rear face of the plate,

the ring is frustoconical by widening from a rear face of the ring, intended to face the civil engineering structure, to a front face of the ring, intended to be further from the civil engineering structure than the rear face of the ring and has in the plane perpendicular to the central axis an outer width substantially equal to that of the through hole.

the ring is frustoconical by widening from a rear face of the ring, intended to face the civil engineering structure, to a front face of the ring, intended to be further from the civil engineering structure than the rear face of the ring and has in the plane perpendicular to the central axis an outer width greater than that of the through hole.

According to one embodiment of the invention, the curved slot is delimited by first and second inner edges in the form of sections of cylinders between a rear face of the ring, intended to be turned towards the civil engineering structure and a front face of the ring, intended to be further from the civil engineering structure than the rear face of the ring.

According to one embodiment of the invention, the curved slot is frustoconical by widening from a rear face of the ring, intended to be turned towards the civil engineering structure, and a front face of the ring, intended to be more away from the civil engineering structure than the rear face of the ring.

According to one embodiment of the invention, the ring is made of a softer material than that of an ankle shank, which is inserted into the curved slot.

According to one embodiment of the invention, the ring is made of a composite material, while a pin of the ankle, which is inserted into the curved slot, is metallic.

According to one embodiment of the invention, the ankle comprises a rod, which extends along the central axis and of which a longitudinal section is engaged in the through hole and has a rod section determined in the plane perpendicular to the central axis.

the through hole having in the plane perpendicular to the central axis a section of the hole greater than the rod section.

A second object of the invention is a method of anchoring equipment to a civil engineering structure using the anchoring device as described above, the method comprising the following steps:

- obtaining the anchoring device;

- for each through hole, fixing of the anchor in the civil engineering structure, the anchor protruding from the civil engineering structure;

- placement of the plate against the civil engineering structure, to have each peg inserted into the through hole; - insertion by forcing of the ring of the anchoring device in the through-hole by inserting each dowel into the curved slot of the ring, so as to lock the ring in position in the through-hole;

- fixing of a locking member on the ankle against the ring.

The invention will be better understood on reading the description which follows, given solely by way of non-limiting example with reference to the figures of the appended drawings, in which:

Figure 1 schematically shows a perspective view of the anchoring device according to one embodiment of the invention,

FIG. 2 schematically represents a perspective view of an ankle inserted in a ring of the anchoring device according to an embodiment of the invention,

Figure 3 shows schematically a top view of an ankle inserted in a ring of the anchoring device according to one embodiment of the invention,

FIG. 4 schematically represents a perspective view of an ankle inserted in a ring of the anchoring device according to an embodiment of the invention,

Figure 5 schematically shows a side view of an ankle inserted in a ring of the anchoring device according to an embodiment of the invention,

Figure 6 schematically shows a top view of the anchoring device according to one embodiment of the invention,

Figure 7 shows schematically a side view of the anchoring device according to one embodiment of the invention,

FIG. 8 schematically represents a top view of an ankle inserted in a ring of the anchoring device according to an embodiment of the invention,

FIG. 9 schematically represents a top view of an ankle inserted in a ring of the anchoring device according to one embodiment of the invention, FIG. 10 schematically represents a top view of an ankle inserted in a ring of the anchoring device according to one embodiment of the invention,

FIG. 11 schematically represents a modular block diagram of an anchoring method according to one embodiment of the invention.

In Figures 1 to 10 is shown the device 100 for anchoring equipment to a GC civil engineering structure.

The anchoring device 100 shown in Figures 1 to 10 is intended for fixing an EQ equipment (not fully shown) to a civil engineering structure GC. The civil engineering GC structure is also called the first work, while the EQ equipment is called the second work. The civil engineering GC structure can for example form part of a nuclear power plant for the production of electricity. As a variant, the civil engineering GC structure can be part of an industrial installation of another type, or of a non-industrial building. The GC civil engineering structure is typically made of reinforced concrete, that is to say of concrete reinforced by metal rods or reinforcement embedded in said concrete. As a variant, the civil engineering GC structure is made of unreinforced concrete. The GC civil engineering structure can be a vertical element (for example wall, post, pillar or others), a concrete block, a floor, a ceiling, or any other suitable structure. The EQ equipment fixed by the anchoring device 100 to the GC civil engineering structure can be, for example, a pipe, or a tank, or a ventilation duct, or a cable tray, a beam, or any other type. equipment or materials. The anchoring device 100 is designed to fix the EQ equipment to the GC civil engineering structure while respecting multiple constraints, in particular earthquake resistance, in compliance with international and national standards defining the acceptable criteria, for example the Document of European Assessment (DEE) 330232-00-0604, EOTA TR 049 and EN1992-4 standard of July 2018. Several anchoring devices 100 (and 5 plates described below) can be provided on the GC structure . For example, several thousand anchoring devices 100 (and plates 5 described below) can be provided on the GC structure of a nuclear power plant for producing electricity. The anchoring device 100 comprises a plate 5 for supporting the EQ equipment, the plate 5 itself comprising one or more through holes 2 (or reservations 2), as shown in Figures 1, 6 and 7. The plate 5 forms the interface between the GC structure and the EQ equipment. Plate 5 is a metal plate, typically steel. It has a thickness of a few millimeters. It is for example of rectangular shape, but could be of any other suitable shape. The plate 5 carries a member 9 for supporting the EQ equipment. This member 9 is for example a metal beam, or a metal bracket, or any other suitable member. The support member 9 can, depending on the type of equipment and industry, be screwed or welded to the plate 5. The support member 9 is fixed to the center of the plate 5. In the case of a plate 5 rectangular, the center corresponds to the intersection of the two diagonals. As a variant, the support member 9 can be fixed anywhere on the plate, at one or more points. The plate 5 has four through holes 5 in the example shown. As a variant, it comprises three through holes 2, or more than four through holes 2 or only two through holes 2 or only one through hole 2. The through holes 2 are advantageously distributed regularly around the member 9. As a variant, the holes feedthroughs 2 are distributed anywhere on the plate depending on the position of the support member 9 on the plate 5, taking into account the mechanical strength requirements according to the loading envisaged. The plate 5 is designed to be placed by its rear face 51 against the free surface 11 of the civil engineering structure GC, typically pressed directly against this surface 11. As a variant, there is a space between the plate 5 and the surface 11, the plate 5 being placed against the free surface 11 by means of any suitable mechanical component such as feet.

The anchoring device 100 comprises, for each through hole 2, an anchor 3, intended to be rigidly fixed in the GC civil engineering structure. The pin has an elongated shape in a longitudinal direction 21 which, in the mounting position, can be substantially perpendicular to the plane in which the plate 5 extends, that is to say to the plane of the free surface 11. The pin 3 protrudes by the civil engineering structure GC by its rod 19 of a certain length. The civil engineering structure GC can include other holes (not shown), each provided for receiving one of the dowels 3 and opening at the level of the surface 11. In the embodiment frequently encountered in production installations of Electricity in France, the hole (s) 2 are wider (or have a larger hole section than the rod section 19 of the plug 3) than the plug (s) 3, to surround the plugs 3 in the mounting position. The peg 3 comprises at a rear longitudinal end a head (not shown) intended to be engaged inside the other hole, and rigidly fixed to the civil engineering structure GC by cooperation with the wall of this other hole. The head is for example blocked inside the other hole by radial expansion of a section of the head, said head section being locked in position inside the other hole by pressure against the wall of the head. that other hole. The pin 3 includes the rod 19, a section 31 of which is engaged in the corresponding through hole 2. The rod 19 is elongated longitudinally and is integral with the head.

The anchoring device 100 comprises, for each through hole 2, a ring 4 inserted in the through hole 2 of the plate 5. The ring 4 has a radially outer edge 42 which is substantially of the same shape and of the same dimension as the through hole 2 and which is turned towards the latter. The radially outer edge 42 extends around a central axis 41 of the ring 4. As shown in Figures 1, 6 and 7, the central axis 41 may be parallel or be slightly inclined relative to the longitudinal direction 21. in which the plug 3 extends from the rear (in the other hole of the GC civil engineering structure) to the front (towards the through hole 2)

The ring 4 is made of a single one-piece piece. The ring 4 provides the direct connection between the plug 3 and the plate 5 in the through hole 2.

In the ring 4 there is a curved slot 43, in which is directly inserted the pin 3. The curved slot 43 is through parallel to the central axis 41 to allow the pin 3 to pass through the slot 43 of the rear face 44 of the ring 4 intended to be turned towards the civil engineering GC structure at the front face 45 of the ring 4 intended to be further from the civil engineering GC structure than the rear face 44 of the ring 4. The curved slot 43 s 'extends from radially outer edge 42 at least up to the central axis 41 and thus opens into the radially outer edge 42. The curved slot 43 is delimited by a first inner edge 46 and by a second inner edge 47, which extend from the rear face 44 of the ring 4 to the front face 45 of the ring 4, the first inner edge 46 being distant from the second inner edge 47. The first inner edge 46 and the second inner edge 47 are curved in the plane P (shown in Figures 3 and 5, 8, 9 and 10) perpendicular to the central axis 4L

The curved slot 43 extends along a curved guide path in the plane P perpendicular to the central axis 41 (this plane P may be for example parallel to the rear face 51 of the plate 5, when this rear face 51 is flat. ). The plane P can be taken in any plane of section of the ring 4 going from the rear face 44 to the front face 45). The curved slot 43 performs the function of guiding the ring 4 on the plug 3, along the curved path, previously mounted on the GC civil engineering structure when mounting the device 100 on the pin 3. The curved guide path (the curved slot 43 ) may be a portion of a circle in the plane P, or be of another shape. Unlike the rectilinear slots of the state of the art, the curved guide path of the curved slot 43 provides the additional function of unconditional stop of the pin 3 against one or the other of the inner edges 46, 47 delimiting the slot. curve 43, that is to say whatever the rotational arrangement of the ring 4 around the central axis 41 and whatever the direction of the force exerted on the ring 4 or on the pin 3 in the plane P of the ring 4. This curved stop function is advantageous when forces are exerted on the EQ equipment and therefore on the plate, for example the shearing forces represented by the thick arrows CIS in FIG. 6, in particular in case of shocks, seismic or other shocks, because the curved slot thus allows a recovery (that is to say an absorption of the dynamic forces in the plane of the plate 5) of these shear forces against this curved stop (and possibly by friction like louse r the ring 4 located at the bottom left in FIG. 6), without the risk of the ankle slipping in the slot 43. Under seismic stress, the direction of the force is random. Also, the ring 4 according to the invention ensures contact with the ankle 3 in all directions. A rectilinear slot of the state of the art does not perform this additional function, since the ankle can be free to slide rectilinearly along the rectilinear direction in which this rectilinear slit extends.

In addition, the slot 43 performs the other function of taking up the positioning games of the anchors 3 on the civil engineering GC structure, for example due to reinforcements integrated into this GC structure. Indeed, the dowels 3 must sometimes bypass the reinforcements and thus have an actual position slightly offset from a planned setpoint position. The pin 3 can thus occupy any position along the curved guide path in the slot 43, in particular in the case where the plate has two holes 2 or more than two holes as mentioned above. In fact, in this case, the holes 2 can have real positions equal to their setpoint positions, and the rings 4 inserted in these holes 2 allow, by causing one or more of the rings 4 to rotate in their associated hole 2 around of their central axis 41, to shift the pegs 3 in the slots 43 along the curved guide path, at least between the central axis 41 and the outer edge 42, to take account of the possible actual offset position of the pegs 3 or geometrical tolerances for fitting the plugs 3. Thanks to the invention, this other function of taking up the positioning clearances of the plugs 3 does not take place to the detriment of the resistance of the device to shear forces during seismic shocks. The positioning of the pin 3 can be done in any position along the curved guide path in the slot 43, without being constrained by another member to be adjusted on the ring 4 in discrete positions along a straight line, which impose a rectilinear movement according to these discrete positions of the ankle in the slot, such as for example a member having to cooperate by grooves according to the aforementioned document FR-A-2 744 501, or a member having to cooperate by teeth according to the document WO 2013/179119 cited above.

The gap that may exist between the rod 19 of the plug 3 and the edge 6 of the hole 2 of the plate 5 generates, for the devices known from the state of the art, a significant reduction in the resistance capacity of the plug 3, for comply with the sizing rules recently codified in the new standard EN 1992-4

(published July 2018). Thus, the resistance capacities of the 5 plates of equipment known from the state of the art are reduced, limiting their use or causing loss of time (re-design of the plates, re-installation of the plugs for example). On the other hand, the very dense reinforcement in the GC structures of nuclear sites very often involves a new design of the plates 5 to take into account the in situ data of installation of the anchors 3 and therefore a round trip between the construction site. and the manufacturing site of the plates 5, to adapt these plates 5 to the installation geometry of the anchors 3. The work involved is costly in time and money. The invention makes it possible, by filling the void (except in the slot 43), on the one hand to accommodate the plates 5 with the geometric tolerance of the installation of the plugs 3, and on the other hand to avoid reducing the capacity of the pins. dowels 3. Associated with this time saving, a gain in the resistance capacity of the anchoring device 100 according to the invention is identified.

The anchoring device 100 further comprises for each through hole 2 a locking member 8 making it possible to block the pin 3 with respect to the ring 4.

According to one embodiment of the invention, the curved guide path of the curved slot 43 has a convexity of constant sign (convex for a positive sign, concave for a negative sign) from the central axis 41 to the edge 42 radially. outer in the plane P perpendicular to the central axis 4L For example, the first inner edge 46 is convex in the P plane and the second inner edge 47 is concave in the P plane, as shown in Figures 2, 3, 4, 6, 7, 8, 9 and 10. Of course, the first inner edge 46 may be concave in the plane P and the second inner edge 47 may be convex in the plane P, as for example for the ring 4c of FIG. 1 The curved slot 43 and the guide path can be oriented clockwise in top view of the front face 45 in the plane P going from the central axis 41 to the radially outer edge 42 as well. that this is illustrated for the rings 4a and 4b of figure 1 and in figures 2 to 10 and / or may be oriented counterclockwise in top view of the front face 45 in the plane P going from the central axis 41 to the radially outer edge 42 as illustrated for ring 4c in figure 1. Thus, according to one embodiment of the invention illustrated in FIGS. 1, 6 and 7, the plate 5 with several holes 2 can have at the same time one or more rings 4a, 4b with curved slot 43 oriented in the direction of the needles d 'a watch in top view of the front face 45 in the plane P going from the central axis 41 to the radially outer edge 42 and one or more rings 4c, 4d with curved slot 43 oriented in the counterclockwise direction d 'a top view of the front face 45 in the plane P going from the central axis 41 to the radially outer edge 42. According to one embodiment of the invention, these rings 4a, 4c with directions opposite to each other can be arranged in an alternating manner, or in a symmetrical manner (as illustrated in Figures 1 and 6 ) or anti-symmetrical with respect to a straight line in the plane of plate 5.

According to one embodiment of the invention, the curved slot 43 has between its inner edges 46 and 47 and in the plane P (and transversely to the guide path) a first determined width L1, greater than a second width L2 (or diameter L2) of the first section 31 of the ankle inserted in the first width L1 of the curved slot 43, as shown in Figures 2, 3, 8, 9 and 10. This allows a clearance between the ring 4 and the ankle 3 to take into account the inclination of the ankle 3. The second width L2 may for example be 8 mm, 10 mm, 12 mm, 16 mm or 20 mm.

According to one embodiment of the invention, the curved slot 43 has its first width L1 going up to a first inner end 431 of the ring 4 and is extended into the ring 4 from this first inner end 431 by a second slot 20 or sawing 20 from the central axis 41 without reaching the outer edge 42, that is to say up to a second inner end 203 of the ring 4. The first inner end 431 may be curved, for example. example with the same (circular) curvature as the rod 19 of the pin 3 inserted in the slot 43. The second slot 20 is axially through and has between its third and fourth inner edges 201 and 202 in the plane P (and transversely to the guide path) a third width L3 less than the second width L2 of the first section 31 of the pin 3, as shown in Figure 3. The second slot 20 may for example be rectilinear in the plane P. This second slot 20 allows a certain limited bending of the ring 4 to bring the edges 201 and 202 closer together when it is inserted into the through hole 2, which facilitates this insertion, while preventing the pin 3 from entering the second slot 20. The inner edges 201 and 202 respectively extend the edges 46 and 47 from the end 431. The direction of the second slot 20 going from the first inner end 431 to the second inner end 203 may be tangent to the guide path of the slot. curve 43 at the first inner end 431, as shown in Figure 3. The direction of the second slot 20 from the first inner end 431 to the second inner end 203 may be within an angular range of 20 ° of each side of the tangent to the guide path of the curved slot 73 at the first inner end 431.

According to one embodiment of the invention, as shown in Figure 3, the second slot 20 is extended by a bore 10 from the second inner end 203. The bore 10 is axially through and is remote from the slot curve 43 and the outer edge 42. The bore 10 has in the plane P (and transversely to the guide path) a fourth interior width L4 less than the second width L2 of the first section 31 of the pin 3 and greater than the third width L3 of the second slot 20. The bore 10 may for example be circular. The bore 10 avoids any risk of sudden rupture of the ring 4 by tearing.

According to one embodiment of the invention, the through hole 2 is frustoconical around the central axis 41 or the longitudinal direction 21, widening from the rear face 51 of the plate 5 to the front face 52 of the plate 5, intended to be further from the civil engineering structure GC than the rear face 51 of the plate 5. The radially outer edge 42 of the ring 4 is frustoconical around the central axis 41 or the longitudinal direction 21 , widening from its rear face 44 to its front face 45. The radially outer edge 42 may have substantially the same angle of inclination with respect to the central axis 41 as the inner surface 6 of the through hole 2. In a first case, the radially outer edge 42 may have outer dimensions (width of the ring in the plane P) equal (for example to more or less between a tenth of a millimeter and a millimeter) to internal dimensions of through-hole 2 (width parallel to plane P) to fill through-hole 2 (except at slot 43) when ring 4 is inserted therein. In a second case, the radially outer edge 42 may have outer dimensions (width of the ring in the plane P) greater (for example greater than a tenth of a millimeter to one millimeter) than the inner dimensions (width parallel to the plane P) of the through-hole 2 to fill the through-hole 2 (except at the level of the slot 43) when the ring 4 is inserted therein. This makes it possible to insert the ring 4 by forcing into the through hole in order to lock it there in position before the final installation of the locking member 8. This second case can be associated with the conical or hourglass-shaped cross section described below of the curved slot 43. For example, the rear face 44 of the ring 4 can have external dimensions (width of the ring 4 in plane P) greater by one tenth of a millimeter to one millimeter than the internal dimensions (width parallel to the plane P) of the through hole 2 at the level of the rear face 51 of the plate 5 and / or the front face 45 of the ring 4 can have external dimensions (width of the ring 4 in the plane P) greater by one tenth of a millimeter to one millimeter than the internal dimensions (width parallel to the plane P) of the through hole 2 at the level of the face front 52 of the plate 5, with for example the radially outer edge 42 having substantially the same angle of inclination with respect to the central axis 41 as the inner surface 6 of the through hole 2.

According to one embodiment of the invention, the first and second inner edges 46, 47 are each in the form of a cylinder section between the rear face 44 of the ring 4 and the front face 45 of the ring 4. Each cylinder section of the first and second interior edges 46, 47 is a surface included in generating straight lines parallel to a given direction along a given curve section. Each cylinder section of the first and second inner edges 46, 47 may not be a circular cylinder section or may be a circular cylinder section. Each cylinder section of the first and second inner edges 46, 47 may be perpendicular to the central axis 41 or to the longitudinal direction 21 of the pin 3

(so-called straight edges in the plane transverse to the guide path). According to one embodiment of the invention, illustrated in Figures 8, 9 and 10, the curved guide path and the curved slot 43 are in a circular ring portion in the plane P perpendicular to the central axis 41. We describe below are examples of construction of the slot 43, where all the geometry is taken in the plane P perpendicular to the central axis 41. Of course, the other characteristics and embodiments, mentioned above, in particular those and those not shown such as for example the second slot 20 and the bore 10 may or may not be present in the embodiment of Figures 8, 9 and 10. The first inner edge 46 is a first circular arc Cl centered on a first point 48, which is located in the ring 4 and which is distant from the central axis 41. The second inner edge 47 is a second arc of a circle C2 centered on the first point 48. The radially outer edge 42 is a third arc of circle C3 centered on a central xe 4L The slot 43 extends around a fourth median arc of a circle C4 centered on the first point 48, located equidistant between the first arc of a circle Cl and the second arc of a circle C2. A third radius R3 of entry of the curved slot 43 is defined the intersection E of the fourth median arc of a circle C4 and of the extension of the third arc of a circle C3 in the curved slot 43, this intersection E forming an entry point E (of the curved slot 43), which is located in the slot 43 outside the radially outer edge 42. This third radius R3 makes a third angle ANG3 positive with respect to a reference straight line REF passing through the central axis 41 in the plane P. A first radius RI of spacing of the curved slot 43 is defined by the fact that this first ray RI is cut in its first midpoint A by the fourth median arc of a circle C4 of the curved slot 43 between the central axis 41 and the entry point E of the curved slit 43. This first radius RI makes a first positive angle ANG1 with respect to the reference line REF in the plane P. A second radius R2 separating the curved slit 43 is defined by the fact that this second ray R2 is cut in its second milie u B by the fourth median arc of a circle C4 of the curved slot 43 and is further from the entry point E than is the central axis 4L This second radius R2 makes a second angle ANG2 negative with respect to the line Reference REF in plane P. According to one embodiment of the invention, the curved slot 43 is extended by the first inner end 431 of the ring 4 beyond the central axis 41, as shown in Figures 8, 9 and 10. Thus, in the example of Figure 8, the bottom of the curved slot 43 between the central axis 41 and the first inner end 431 extends along a curve to accommodate three diameters L2 of the rod 19 of the pin 3 placed end exhausted. In the example of FIG. 9, the bottom of the curved slot 43 between the central axis 41 and the first internal end 431 extends along a curve making it possible to accommodate two diameters L2 of the rod 19 of the pin 3 placed end to end. In the example of FIG. 10, the bottom of the curved slot 43 between the central axis 41 and the first internal end 431 extends along a curve making it possible to accommodate a diameter L2 of the rod 19 of the ankle 3. According to the embodiment of the invention shown in Figures 8, 9 and 10, the difference between the first angle ANG1 and the third angle ANG3 is between 10 ° and 50 °, in particular between 20 ° and 40 °. According to one embodiment of the invention, shown in Figures 8 and 9, the difference (ANG3 - ANG2) between the second angle ANG2 and the third angle ANG3 is between 75 ° and 120 °, in particular between 100 ° and 110 ° . For example, in Figures 8 and 9, the third angle ANG3 is 30 °, the first angle ANG1 is 60 ° and the second angle ANG2 is equal to -72.4 °. For example, in Figure 10, the third angle ANG3 is 45 °, the first angle ANG 1 is 67.5 ° and the second angle ANG2 is equal to -73.3 °. Of course, any other angle value in these angular ranges can be provided.

According to one embodiment of the invention, the curved slot 43 is frustoconical around the central axis 41 or the longitudinal direction 21, widening from the rear face 44 of the ring 4 to the front face 45 of the ring 4. This makes it possible to have a clearance between the ring 4 and the ankle 3 to take into account the inclination of the ankle 3.

According to one embodiment of the invention, the curved slot 43 has in the plane transverse to the guide path (plane containing the width L1) a cross section in the shape of an hourglass, that is to say narrowing then s 'widening from the rear face 44 of the ring 4 to the front face 45 of the ring 4. According to one embodiment of the invention, the ring 4 is made of a material which is less hard (which may be able to measure hardness by penetration, for example of the Vickers type or others) than that of the first section 31 of the ankle 3 inserted into the curved slot 43. The ring 4 is made of a material different from that of the ankle 3. This results in a matting of the ring 4 by the ankle 3. According to one embodiment of the invention, the ring 4 can be made of. a composite material (for example chambering of the inside of the ring 4 by a composite material), while the first section 31 or the plug 3 is metallic, for example steel. According to another embodiment of the invention, the ring 4 may consist of a metal body and a layer of composite material covering the first and second inner edges 46, 47 of the ring 4. According to one of these modes of embodiments of the invention, the composite material may be of the polyethylene type and / or polyethylene derivatives.

According to one embodiment of the invention, the locking member 8 is provided at the front end 23 of the peg 3, protruding from the GC civil engineering structure. The locking member 8 can be provided on the side of the front face 45 of the ring 4.

The invention also provides a method of anchoring the EQ equipment to the GC civil engineering structure. This method comprises the steps described below with reference to FIG. 11.

During a first step E1, the anchoring device 100 is obtained. During a second step E2 subsequent to the first step E1, for each through hole 2, the pin 3 is fixed in the civil engineering structure GC, so that the pin 3 protrudes from the civil engineering structure GC .

During a third step E3 after the second step E2, the plate 5 is placed against the civil engineering structure GC, to have each plug 3 inserted into the corresponding through hole 2 of the plate 5.

During a fourth step E4 subsequent to the third step E3, the ring 4 is inserted by forcing into the through-hole 2 while inserting each pin 13 in the curved slot 43 of the ring 4. The forcing is carried out so to block the ring 4 in position in the through hole 2 in relation to the plate 5.

During a fifth step E5 subsequent to the fourth step E4, the locking member is fixed on the pin 3 against the ring 4. According to one embodiment of the invention, the pin 3 has a front threaded end 23, carried by the rod 19 in front of the civil engineering structure GC. The section 31 extends longitudinally between the threaded end 23 and the head or is provided at least partly in the threaded end 23. The locking member 8 comprises a nut 81 screwed onto the threaded front end 23 of the dowel 3. The nut 81 comes into contact with the front face 45 of the ring 4 during the fifth step E5 to keep the ring 4 pressed into the through hole 2. Before screwing the nut 81 on the threaded end 23 during the fifth step E5, the radially outer edge 42 is inserted by forcing 4 during the fourth step E4 into the through hole 2, possibly with a slight force deformation of the ring 4. The pin 3 has a tightening torque specified by the manufacturer. The capacity of the anchor is guaranteed by the manufacturer according to a defined tightening torque. Mounting by tightening the nut deforming the ring 4 would lead to this torque being exceeded. After the ring 4 has been fitted by first forcing the ring 4 into the through hole 2 during the fourth step E4, the nut 81 is screwed during the fifth step E5 until it comes into contact against the front face 45 (and up to the tightening torque specified by the manufacturer) then this screwing during the fifth step E5 is stopped when the tightening torque specified by the manufacturer is reached, which most often results in not pushing the ring 4 further down in the through hole 2. The ring 4 thus locks the plate 5 in position with respect to the pin 3 fixed to the GC civil engineering structure.

According to one embodiment of the invention, the through hole 2 has in the plane P a larger hole section than the rod section 19 of the plug 3. This makes it possible to vary the position of the plug 3 in the GC structure. of civil engineering over a wide range of positions, in particular to take into account the position of the metal rods reinforcing the concrete of this GC civil engineering structure.

Of course, the embodiments, characteristics, possibilities and examples described above can be combined with each other or be selected independently of each other.

Claims

1. Device (100) for anchoring an item of equipment (EQ) to a civil engineering structure (GC), the device comprising: - a plate (5) for supporting the equipment (EQ), comprising at least one through hole (2),

- for each through hole (2), a dowel (3) intended to rigidly fix the plate (5) to the civil engineering structure (GC) and a ring (4) of a shape matching that of the through hole (2) and intended to be inserted into the through hole (2), characterized in that the ring (4) is in one piece having the function of making the direct connection between the pin (3) and the plate (5), the ring (4) comprising a central axis (41), a radially outer edge (42) and a curved slot (43), axially through and extending at least from the central axis (41) to the radially outer edge ( 42) along a curved guide path of the ankle (3) in a plane perpendicular to the central axis (41), the curved slot (43) being open in the radially outer edge (42), the ankle (3) being intended to be inserted directly into the curved slot (43) of the ring (4), the device (100) further comprising for each through hole (2) a locking member (8) intended to be positioned on the ring (4).

2. Device according to claim 1, characterized in that the curved guide path of the curved slot (43) is at constant sign of convexity of the central axis (41) to the edge (42) radially outer in the perpendicular plane. to the central axis (41).

3. Device according to any one of the preceding claims, characterized in that the curved slot (43) is delimited up to a first inner end (431) by first and second inner edges (46, 47) of the ring ( 4), which are spaced from each other by in the plane perpendicular to the central axis (41) a first internal width (L1) of the curved slot (43), greater than a second width (L2) d 'a rod (31) of the ankle (3), the curved slot (43) is extended from the first inner end (431) by a second slot (20) axially through, delimited up to a second inner end (203) by third and fourth inner edges (201, 202) of the ring (4), which are spaced apart in the plane perpendicular to the central axis (41) by a third width (L3) smaller than the second width (L2) of the rod (31) of the ankle (3).

4. Device according to claim 3, characterized in that the second slot (20) is extended from the second inner end (203) by a bore (10) axially through, away from the curved slot (43) and having in the plane perpendicular to the central axis (41) a fourth inner width (L4) smaller than the second width (L2) of the rod (31) of the ankle (3) and greater than the third width (L3) of the second slot (20).

5. Device according to any one of the preceding claims, characterized in that the through hole (2) in the plate (5) is frustoconical by widening from a rear face (51) of the plate (5), intended to be turned towards the civil engineering structure (GC) with a front face (52) of the plate (5), intended to be further from the civil engineering structure (GC) than the rear face (51) of the plate , the ring (4) is frustoconical by widening from a rear face (44) of the ring (4), intended to be turned towards the civil engineering structure (GC) on a front face (45) of the ring (4), intended to be further from the civil engineering structure (GC) than the rear face (44) of the ring (4) and has in the plane perpendicular to the central axis (41) an exterior width substantially equal to that of the through hole (2).

6. Device according to any one of claims 1 to 4, characterized in that the through hole (2) in the plate (5) is frustoconical by widening from a rear face (51) of the plate (5) , intended to be turned towards the civil engineering structure (GC) with a front face (52) of the plate (5), intended to be further away from the civil engineering structure (GC) than the rear face (51) of the plate, the ring (4) is frustoconical by widening from a rear face (44) of the ring (4), intended to be turned towards the structure (GC) of civil engineering with a front face (45) of the ring (4), intended to be further from the civil engineering structure (GC) than the rear face (44) of the ring (4) and has in the plane perpendicular to the central axis

(41) an outer width greater than that of the through hole (2).

7. Device according to any one of the preceding claims, characterized in that the curved slot (43) is delimited by first and second inner edges (46, 47) in the form of sections of cylinders between a rear face (44) of the ring (4), intended to be turned towards the civil engineering structure (GC) and a front face (45) of the ring (4), intended to be further away from the civil engineering structure (GC) than the face rear (44) of the ring (4).

8. Device according to any one of claims 1 to 6, characterized in that the curved slot (43) is frustoconical by widening from a rear face (44) of the ring (4), intended to be turned towards the civil engineering structure (GC) and a front face (45) of the ring (4), intended to be further from the civil engineering structure (GC) than the rear face (44) of the ring (4).

9. Device according to any one of the preceding claims, characterized in that the ring (4) is made of a material more flexible than that of a rod (31) of the ankle (3), which is inserted into the curved slot (43).

10. Device according to any one of the preceding claims, characterized in that the ring (4) is made of a composite material, while a rod (31) of the ankle (3), which is inserted into the curved slot ( 43), is metallic.

11. Device according to any one of the preceding claims, characterized in that the pin (3) comprises a rod (19) which extends along the central axis (41) and of which a longitudinal section (31) is engaged. in the through hole (2) and has a rod section determined in the plane perpendicular to the central axis (41),

the through hole (2) having in the plane perpendicular to the central axis (41) a section of the hole greater than the shank section.

12. Method for anchoring an item of equipment (EQ) to a civil engineering structure (GC) using the anchoring device (100) according to any one of the preceding claims, the method comprising the following steps obtaining the anchoring device (100);

- for each through hole (2), fixing the anchor (3) in the civil engineering structure (GC), the anchor (3) protruding from the civil engineering structure (GC);

- placement of the plate (5) against the civil engineering structure (GC), to have each dowel (3) inserted in the through hole (2);

- insertion by forcing of the ring (4) of the anchoring device (100) in the through hole (2) by inserting each plug (13) into the curved slot (43) of the ring (4), so as to block in position the ring (4) in the through hole (2); - fixing of a locking member on the ankle (3) against the ring (4).