JPH0375697B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to an anchoring device for securing the ends of tensioned reinforcement for prestressed concrete elements, preferably enclosed in a greased sheath and preferably braided into cables. . In particular, these devices include a rigid distribution plate defining a frusto-conical housing adapted to jointly receive the end of the reinforcement to be wedged surrounded by a frusto-conical ring; a cap adapted to close and cover the largest diameter end of the other housing in a grease-tight manner; the smallest diameter end of the housing itself seals the end of a corresponding sheath, particularly for Relating to things connected by a funnel. In the known embodiments of these fixing devices, the cap is a mechanically strong part, generally molded from metal, the bottom of which is fitted with an annular seal on a complementary threaded collar integral with the plate. It is screwed on with a . The entire cap and seal is relatively expensive and its installation is time consuming. The aim of the invention is inter alia to overcome these drawbacks. For this purpose, a fixing device of the kind in question consists essentially of a slightly deformable plastic cap with a cylindrical skirt tapering towards the edges, at least two Comes with several fixing overhangs. ●The part of the board that receives the cap is
In the form of a rotating bowl, the bottom of its lateral inner surface is of a frusto-conical or similar shape adapted to cooperate with the tapered edge of said skirt, and the interaction between this cap and this edge is The surface is designed to ensure a sealing effect and is provided with arcuate ribs cooperating with said overhang to fix the cap in a bayonet manner to the bowl.
There is. It is characterized by A desirable embodiment further includes any of the following equipment. ●The outer surface of the skirt has at least one overhang for preventing erroneous operation and for checking angles, which cooperates with a certain notch provided in one of the ribs. -Each fixing ledge is defined laterally by two parallel planes and by two planes projecting at an acute angle on the outside, the latter plane lying on the same side as the top of the cap at the center of this cap. perpendicular to the line, the other surface being slightly inclined with respect to the center line of this cap, the lateral inner surface of the bowl having a surface cooperating cohesively with said slightly inclined surface. There is a certain frustoconical contact surface. ●Two ears, which are integrally molded with the cap, are provided on the outer surface of the bottom of the cap. ●The bottom of the cap has a central flat circular part and a truncated conical neck that connects this circular part to the skirt. ●The bottom of the cap has at least one hole for injecting grease, and it is firmly connected to a plug to close this hole with a flexible string.The assembly of this plug and this string is It is molded integrally with the cap by injection molding. In addition to these main pieces of equipment, the present invention encompasses a number of other pieces of equipment, preferably used simultaneously, which will be described in more detail below. Preferred embodiments of the present invention will be described below with reference to the accompanying drawings, but the present invention is of course not limited thereto. The reinforcing material considered here is one that prestresses the concrete member or structure 1 by applying tension between both ends, and the reinforcing material itself is wrapped around the core wire 4 of a strand with a slightly larger diameter. It is formed from a cable 2 (FIG. 2) formed from a side wire 3. In a manner known per se, this cable is provided with a plastic sheath 5 made of polyethylene, for example.
The space between this sheath and the strands forming the cable is filled with grease. The use of such a sheath or such a grease allows relative sliding of the reinforcement with respect to the sheath even after the concrete has been placed around the sheath, which is caused by the tension of the reinforcement and especially by the action of moisture. Facilitates protection of reinforcement against corrosion. The fixing device for fixing one end of the cable 2 includes a rigidity distribution plate 6 having a thick center and a truncated conical housing 7 passing through the center;
Especially those made of cast iron. This housing 7 is adapted to jointly receive the ends of the reinforcement in question which are surrounded at 9 by a set of three wedges 8 forming a longitudinally split ring. Each of these wedges extends approximately 120° around a center line common to the cable 2 and the housing 7 and has a frusto-conical shape complementary to the cylindrical inner surface and housing adapted to mate with the cable. There is an outer surface. The edge of the small diameter opening of the frusto-conical housing 7, and more precisely the edge of the cylindrical collar 10 extending this opening in the axial direction, has a sheath 5, which is interrupted just short of the end of the reinforcement 2. The ends of the wedges 8, which enable the wedges 8 to grip this reinforcement, are connected in a mutually sealing manner by suitable funnels 11 made of plastic, which are force-fitted to the collar with their cylindrical ends. This is essentially the closure of another or larger opening in the housing and is the subject of the present invention. The rim of this mouth is here in the form of a rotating bowl 12, to the inner surface of which are successively connected a flat transverse annular region 13 forming the bottom of the bowl; There is a curved area 14 in the form of a quadrant; a first cylindrical area 15; a frusto-conical bell mouth area 16; and a second cylindrical area 17. Projecting from the cylindrical region 17 are three ribs 18 along an arc angularly offset from each other by 120 DEG around the center line and angularly separated from each other by gaps 19 (FIG. 3). Furthermore, one of the three ribs 8 is interrupted by a notch 20 over an angle of the order of 30 DEG. To close the bowl 12 with the inner contour defined above, a cap 21 made of a slightly deformable plastic such as polyethylene, more precisely molded by injection molding, is used. The cap 21 has a rotating shape and is connected to each other in sequence to form a central flat circular part 2 that forms the top of the cap.
2. There is a frusto-conical neck 23 and a cylindrical skirt 24 which tapers towards the distal edge 25 and whose outer diameter is slightly smaller than the inner diameter of the cylindrical region 15 of the bowl 12. The thinning towards the edge in question corresponds to the inside thickness of the skirt, not the outside. In other words, the setback appears at 26 on the inner surface of the skirt, the outer surface of which is approximately cylindrical over its entire extent, while possibly having a slightly frustoconical shape that constricts towards the center line at the ends. You can also do it. The thickness of the tapered edge 25 is preferably between 0.4 and 0.6 mm. Projecting from the outer surface of the skirt 24 are three fixing overhangs 27 and an angle checking overhang 28 to prevent erroneous operation. Each fixing ledge 27 is here laterally separated by two planes 29 parallel to the center line of the assembly, outwardly from the same side as the top of the cap to a plane 30 perpendicular to this axis and on the other side. It is defined by a plane 31 slightly inclined to the centerline. The slope in question is essentially the same as that of the frustoconical surface 16 of the bowl. The width of each overhang 27 is narrower than that of the gap 19. The axial distance between the lateral surface 30 of the overhang and the distalmost edge of the skirt 24 is essentially the distance between the flat bottom of the bowl 12 and the surface of each rib 18 directed toward this bottom. equal. The overhang 28 for preventing erroneous operation is in the form of a columnar shoe whose generatrix is parallel to the center line of the assembly and whose directrix is semicircular or rectangular. This bulge is provided axially through the notch 20 so as to be angularly tangent to the angular end of this notch so as to define the end point of the movement of the assembly. Two ears 32, integrally molded with the cap, project from its neck and facilitate manual control of its angular movement. These ears, for example, are flat and triangular in shape, as can be easily seen in FIG. The bottom of the cap is provided with two holes 33 through which the interconnected volumes inside the cap 21, the bowl 22, the housing 7, the funnel 11 and the sheath 5 are filled with grease, more precisely. , Grease filling can be completed. These holes 33 are advantageously located at the ends of an axial chimney 34 formed in the neck 23. These can be plugged by small plugs 35 attached to the ends of flexible cords 36, which together with these plugs are molded integrally with the entire cap. This method prevents the stopper from being lost and ensures that the stopper is always at hand. A bayonet type movement is required to attach the cap 21 to the bowl 12. In other words, the cap is first positioned oriented so that its projections 27 and 28 are axially opposed to the gap 19 and the notch 20, respectively. These overhangs are then introduced axially into their housing while the skirt 24 is inserted into the bowl 12.
Fit inside. At the end of this axial introduction, the edge 2 of the skirt 24
5 contacts the curved area 14 at the bottom of the bowl. The cap is then turned in the screw direction, which causes the flange 27 to enter angularly into a groove along the arc defined between the rib 18 and the frusto-conical area 16 of the bowl. This angular entry is guided by the slightly slanted shape of the surfaces of the ribs that the outriggers come into contact with, and this guide provides a slight tightening onto the outriggers as they advance further into their grooves. creating a binding effect, which makes it difficult to unintentionally reverse this approach and pushes the edge 25 slightly axially back toward the area 14, which automatically creates a very close contact between these two elements. The application in question probably results in a slight centripetal deformation of the edge 25, thus ensuring a sealed contact with respect to grease. The end point of the angular movement considered is the overhang 28
contact with the opposite ends of the ribs 18. The cap 21 is then pressed very firmly and completely sealingly onto the bowl 12. A bayonet movement in the opposite direction to that described above is sufficient for separation. If this is followed, no matter which implementation type is adopted, a fixing device whose structure and operation satisfactorily conform to those described above will be obtained. This device has clear advantages over previously known ones, in particular as regards the simplicity of installation, which no longer requires the use of seals, and the cost. As already follows from the above, it is self-evident that the invention is not limited to the form of application and to the specifically considered embodiments, but on the contrary encompasses many variants thereof.

[Brief explanation of drawings]

1 is a longitudinal sectional view taken along the line of FIG. 3 of a fixing device according to the present invention equipped with a cap, FIG. 2 is a cross sectional view taken along the line of FIG. 1, and FIG. FIG. 4 is a perspective view of only the cap. 1... Concrete member, 2... Reinforcement material, 3...
...Lateral line of strand, 4... Core line of strand,
5...sheath, 6...rigidity distribution plate, 7...housing, 8...wedge, 9...slit, 10...color,
11... Funnel, 12... Rotating bowl, 13... Flat annular area, 14... Curved area, 15... First cylindrical area, 16... Bell mouth area, 17... Second cylindrical area, 18... rib, 19... gap, 20...
Notch, 21... Cap, 22... Circular part, 23
... Neck, 24 ... Skirt, 25 ... Skirt edge, 26 ... Retraction, 27 ... Fixing overhang, 28
... Overhang for angle verification, 29 ... Parallel plane, 30
. . . a surface perpendicular to the center line, 31 . . . a surface inclined to the center line, 32 .

Claims (1)

[Scope of Claims] 1. An anchoring device for anchoring the end of a prestressed reinforcing material 2 housed in a sheath 5 filled with grease, which anchors the end of the reinforcing material by surrounding it with a truncated conical ring. a rigid distribution plate 6 forming a frusto-conical housing 7 which is adapted to co-operately receive a wedge 8 for attaching the wedge 8 and a rigid distribution plate 6 forming a frusto-conical housing 7 which is adapted to co-operately receive the wedge 8; In the device having a sheathing cap 21, the smallest diameter end of the housing being in sealing connection with the end of the corresponding sheath 5, said cap having a slightly cylindrical skirt 24 which tapers at the edge 25. It is made of deformable plastic and has at least two fastening lugs 27 on the outer surface of the rim, and the part of the rigidity distribution plate receiving the cap is in the form of a rotating bowl 12 whose lateral inner surface 14 is truncated. It is of a conical or similar shape and is adapted to cooperate with the tapered edge 25 of said skirt to ensure a mutual sealing effect between this bottom and this edge, and on said surface is provided with said overhang 27. A device characterized in that there are ribs 18 along an arc which cooperate to ensure a bayonet-like fixation of the cap to the bowl. 2. The outer surface of the skirt 24 is provided with at least one protrusion 28 for preventing erroneous operation and for angle verification, which is adapted to cooperate with a notch 20 formed in one of the ribs 18. The fixing device according to scope 1. 3. Each fixing flange 27 is defined laterally by two parallel planes 29 and by two planes projecting at an acute angle on the outside, a plane 30 lying on the same side as the top of its cap. is perpendicular to the centerline of this cap and the other surface 31 is slightly inclined with respect to this centerline, and the lateral inner surface of the bowl has a slightly inclined cutout cooperating cohesively with said surface 31. 3. A fixing device according to claim 1, characterized in that there is a conical contact surface (16). 4. The fixing device according to claim 3, wherein the ribs adapted to cooperate with the fixing overhangs are slightly inclined to produce a tightening effect. 5. The fixing device according to any one of claims 1 to 4, characterized in that two ears 32 integrally formed with the cap 21 are provided on the outer surface of the bottom of the cap. 6. Claims 1 to 5 characterized in that the bottom of the cap has a flat central circular part 22 and a frusto-conical neck part 23 connecting this circular part to a skirt 24. The fixing device according to any one of the above. 7. At least one hole 33 for injecting grease is bored in the bottom of the cap 21, and this hole is firmly connected by a plug 35 and a flexible string 36 to close the hole. 7. The fixing device according to claim 1, wherein the assembly including the string is integrally formed with the cap by injection molding.