EP0098927A2 - Système pour l'ancrage d'extrémité d'au moins une barre de tension en un matériau composite fibreux dans des constructions en béton précontraint - Google Patents

Système pour l'ancrage d'extrémité d'au moins une barre de tension en un matériau composite fibreux dans des constructions en béton précontraint Download PDF

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Publication number
EP0098927A2
EP0098927A2 EP83104139A EP83104139A EP0098927A2 EP 0098927 A2 EP0098927 A2 EP 0098927A2 EP 83104139 A EP83104139 A EP 83104139A EP 83104139 A EP83104139 A EP 83104139A EP 0098927 A2 EP0098927 A2 EP 0098927A2
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EP
European Patent Office
Prior art keywords
clamping
tendons
anchoring
wedge
hollow body
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP83104139A
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German (de)
English (en)
Other versions
EP0098927B1 (fr
EP0098927A3 (en
Inventor
Gallus Prof. Dr.-Ing. Rehm
Lutz Prof. Dr.-Ing. Franke
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
RESTRA-PATENTVERWERTUNG GMBH
Original Assignee
RESTRA-Patentverwertung GmbH
RESTRA PATENTVERWERTUNG GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by RESTRA-Patentverwertung GmbH, RESTRA PATENTVERWERTUNG GmbH filed Critical RESTRA-Patentverwertung GmbH
Priority to AT83104139T priority Critical patent/ATE47612T1/de
Priority to EP83104139A priority patent/EP0098927B1/fr
Publication of EP0098927A2 publication Critical patent/EP0098927A2/fr
Publication of EP0098927A3 publication Critical patent/EP0098927A3/de
Application granted granted Critical
Publication of EP0098927B1 publication Critical patent/EP0098927B1/fr
Expired legal-status Critical Current

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    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
    • E04C5/08—Members specially adapted to be used in prestressed constructions
    • E04C5/12—Anchoring devices

Definitions

  • the invention relates to a device for the end anchoring of at least one rod made of fiber composite material used as a tendon in prestressed concrete construction, with a hollow anchoring body which can be fixed on the prestressed concrete component and in which a clamping body which extends over a longitudinal section of the rod and is penetrated by the rod is arranged on the lateral forces acting by means of a clamping device acting at right angles to the longitudinal axis of the rod and imparting a frictional connection between the rod and the clamping body or the anchoring hollow body, the clamping body being part of a longitudinal force / transverse force conversion device with which the device introduced into the longitudinal direction of the rod Forces which are proportional to the transverse forces which impart the frictional connection between the rod and the clamping body can be transformed.
  • Rods made of fiber composite materials - glass or carbon fibers cast into a resin matrix - have a high tensile strength or breaking strength in the longitudinal direction of the fiber, which is around 1600 N / mm 2 for glass fiber composite (GV) rods. They can therefore be used as tendons in prestressed concrete construction instead of the usual prestressing steels.
  • GV glass fiber composite
  • those which can be used in connection with GM tendons are those which have a frictional fixation of the GM tendons in a suitable anchor body, which in turn is supported or anchored on the concrete component in a tensile manner, convey;
  • Such anchoring devices are, for example, wedge anchors and casting anchors with an internally conical anchoring body supported on the concrete component and penetrated in the longitudinal direction by the tendons, which in turn are attached to the anchoring hollow body by means of a generally multi-part in the case of wedge anchoring, in the case of potting anchoring as a one-piece potting cone are set, the transverse pressure of the clamping body and the tendons themselves required for the frictional fixing of the GM tendons being achieved by sufficient displacement of the clamping body in the longitudinal direction of the anchoring.
  • this potting cone no longer resembles the conical inner shape of the anchoring hollow body due to the shrinkage of the potting compound which generally occurs is because there are larger absolute shrinkage amounts at the larger diameter than at the smaller one.
  • the object of the invention is therefore to provide a device of the type mentioned at the outset which enables a gentle anchoring of GM tendons and thus a better utilization of the specific tensile strength of such tendons.
  • the L ijkskraft / lateral force conversion means ate a lateral force
  • a lateral force Contains limiting device with which a predeterminable amount of the transverse forces can be set.
  • This setting of the transverse forces in the sense of a limitation to the amount that the cross-pressure-sensitive GM materials can withstand for a long time, but which on the other hand is chosen as high as possible so that one can get by with the shortest possible anchorage lengths, as in a preferred embodiment of the device according to the invention provided, be achieved in that the force-implementation or limiting means is provided at least one limit member in the frame, through which an upper bound of the lateral force can be predetermined, the cross so that p ressung of the tendon or optionally several anchored with the inventive device Spaanglieder the cannot exceed the limit mentioned.
  • An anchoring device suitable for this purpose is realized according to one embodiment of the invention in that the force-converting device, as a limit value element, has a tensioning element which can be actuated from the rod exit side of the anchoring hollow body and with which one is directed parallel to the longitudinal direction of the tendon or the hollow body Tension force defined amount is adjustable, the implementation of which results in the transverse forces imparting the frictional fixation of the tendon.
  • the particular advantage of the device according to the invention is that its tensioning element in the arrangement according to the invention is easily accessible from the outside even when the anchoring head is inserted into the recess provided for receiving it in the concrete, so that the setting of the required clamping force is already sufficient is significantly simplified. A precise setting and distribution of the clamping force is ensured by the force transmission device arranged in the interior of the anchoring head. It is sufficient - in principle at least - if only a single die Power transmission device acting clamping element is provided, so that the "work required to set the clamping force" is low and otherwise a simple structure of the device is achieved.
  • a power transmission device provided with wedges according to the invention enables a well-defined setting of the transverse pressure on a relatively small displacement path of the wedges.
  • the tensioning element can be designed so that a re-tensioning, e.g. done by one or more preloaded disc springs.
  • the hollow body has a rectangular-quadrangular cross section and flat rod-shaped tendons are provided which are arranged between clamping plates, a plurality of such tendons and clamping plates alternating in a sandwich -like structure between the wedge plate arrangement and one of the outer walls of the hollow body can be arranged. It goes without saying that such sandwich structures can also be provided on both sides of the wedge arrangement.
  • a design of the device according to the invention is particularly advantageous in which the flat bar-shaped tendons are also enclosed on their longitudinal edges by the clamping plates and thus counteracts a fraying of the tendons on their longitudinal edges.
  • the longitudinal force / transverse force conversion device comprises a device that extends in the longitudinal direction of the anchoring hollow body by driving in a truncated cone.
  • the clamping body is radially expandable by means of axial crushing and is arranged between a crushing plate on the inlet side and one on the outlet side, of which at least one plate is displaceably guided in the axial direction at an end section of the hollow body and is also defined by means of the clamping element adjustable clamping force can be clamped against the other or pressed onto the expandable clamping or squeezing body, this body at least from a lower limit value of the prestressing and preferably already in the relaxed state in the area between the squeeze plates and between the tendon and / or further in Parts of the clamping device arranged inside the hollow body completely fill the remaining cavity.
  • the tendons are inserted in slotted clamping sleeves made of steel or another "hard” material, reliable anchoring of the tendons is ensured even if the squeeze body consists of a relatively “soft” material, since then the Clamping sleeves surrounding the tendons ensure that the force is introduced into the hollow body or into the concrete surrounding it.
  • the tendons are enclosed by a clamping body, which consists of a material with a sufficiently high strength for power transmission in the longitudinal direction, and the clamping body is enclosed on at least part of its outer surface by the squeezing body which can be expanded by squeezing.
  • This embodiment includes a design of the clamping body which is particularly suitable for a compact arrangement of a plurality of tendons.
  • the block-shaped clamping body provided here can, depending on the material, be designed as a casting part, for example made of epoxy resin material, which may be reinforced by suitable fillers and / or fibrous materials, but also be made from a metal block, in the ver from the outlet end, preferably at right angles to each other running slots are sawn, which intersect the longitudinal links in the axle transmitter receiving the tension members.
  • Such a clamping body is also suitable in connection with such embodiments of the device according to the invention in which wedge plates or the like which are braced against one another are used as the force transmission device.
  • the tendons in a further embodiment of the invention, it is reliably avoided that the surface roughness of the tendons, which is necessary with regard to prestressing the same in the prestressed bed, when the device according to the invention is used to achieve or maintain the prestressing of the bars , leads to peak loads that could cause the rods to break.
  • the cladding foils are of course only required if hard clamping bodies or clamping sleeves are used. Alternatively, the tendons and / or the clamping sleeves can be provided with flexible coatings.
  • the device according to the invention is in principle also suitable for prestressing in the prestressing bed, because here too, anchoring of the tension members that is fully effective over a long period of time is required. Furthermore, the device according to the invention is also suitable for the end anchoring of rods, which can be used, for example, for bracing transmission masts, tent roofs and similar building structures.
  • an effective limitation of the transverse forces which act on the tendons to be anchored is achieved by providing a design of the clamping device or the longitudinal force / lateral force conversion device which is very suitable for the setting or specific choice small implementation ratios allowed.
  • the clamping body is designed as a body which can be compressed by the tensile forces acting on the tendons in the axial direction, for example by wedge action, in which, in addition to tendons, in which the load in the case of the transverse forces unreacted pulling forces attack, further, with respect to their mechanical properties and dimensions lindstäbe the tendons corresponding support body or B can be used and to which the anchoring Tendons can be fixed in an analogous manner in the clamping body.
  • the effective shear force / tensile force reduction ratio can be predefined in a simple manner by the numerical ratio of the tendons anchored in a wedge-body part of the clamping body. It goes without saying that this reduction ratio can also be influenced, in the case of a two-part design of the clamping body, by using blind rods in the wedge-body part of the clamping body in addition to the tendons via which the effective tensile forces act.
  • a radial or mirror-symmetrical arrangement of the tendons involved in the tensile force entry can be selected when replacing individual tendons with such dummy rods, or if the symmetry of the distribution of these tendons matches the symmetry of the distribution of the tendons as a whole.
  • an odd number of tendons arranged along a common plane and held between the flat wedges of the wedge clamping body part is provided, so that when individual tendons are replaced by blind rods, for example, an arrangement can be realized in which in each case a blind rod can be arranged between two involved in the transfer of traction tendons to as uniform as possible to achieve in the Kr afteintragung Endverank fürsvorraum.
  • a compensating layer provided according to the invention provides the advantage that a uniform distribution of the transverse pressure of the tendons, which are held between fixed clamping body elements which are movably held in the transverse direction, along the anchoring length of the tendons is also ensured to a sufficient extent if the walls providing the lateral support of the clamping body one provided for this purpose in the concrete part of a recess or the clamp body receiving anchoring hollow body are not exactly corresponding to the different bearing - z faces extend the clamp body.
  • such a compensating layer will only be required if the clamping body is inserted into a recess in the concrete component, the compensating layer then expediently being designed as an inner lining of this recess which compensates in particular for surface roughness and manufacturing tolerances of the recess.
  • a resilient adhesive layer provided according to the invention which is embedded in the tendons, has the advantage that peak pressures caused by surface roughness of the tendons themselves and / or the clamping element elements, which could give rise to significantly higher values of the transverse pressure of the tendons, can be largely avoided. Rather, specifically applied surface roughnesses on the clamping element elements can be used to advantage for better adhesion of the tendons in the clamping body and thus as a result for a reduction in the minimum transverse pressure required for the secure fixing of the tendons.
  • the adhesive layer present between the tendons and the clamping body elements, the manufacturing technology as a coating of the tendons itself or as a coating of the clamping body elements can, however, not be too thick, so that too large displacement paths of the wedge members are not necessary to achieve the minimum transverse pressure mentioned. It is therefore expedient if the layer thickness is only slightly greater than the surface roughness of the tendons or the clamping element elements which can be expressed in terms of diameter or distance difference.
  • a defined limitation of the load-dependent contribution to the transverse pressure is achieved by a suitable choice of the numerical ratio between tendons which are anchored in an externally conical, axially displaceable clamping body part and those tendons which are anchored in a central clamping body part, one in the anchoring hollow body fixed slide core for as Ver g ußteil formed outer clamping body part forms obtained.
  • the device according to the invention of a potting-cone anchoring is largely analogous, although the core also consist of a different material and, if appropriate, can be composed of clamping plates made of metal mutually supported by the tendons, with gaps remaining between the plates by a suitable sheathing should be covered to prevent penetration of the potting compound into the core clamping body.
  • FIGS. 1-12 are explained below with special reference to their use for permanent end anchoring of tendons made of fiber composite materials in prestressed concrete construction; but they can also, e.g. B. in connection with conventional tensioning presses, can be used as movably arranged drawing heads with which the tendon ends only have to be held over a relatively short period of time in order to set the required prestressing.
  • a person skilled in the art can readily recognize other possible uses in which permanent or only temporary anchoring of tendons is very important on the basis of the constructive and functional details of the individual exemplary embodiments to be explained.
  • FIGS. 1 and 2 show an end anchoring device 10 according to the invention for three flat bar-shaped tendons 11-13 made of glass fiber composite material in the special case example shown, which are arranged one above the other with a parallel course at a vertical distance. These penetrate an anchoring hollow body 14 of the device 10 designed as a steel hollow profile with a square 4x4 cm 2 cross section in the longitudinal direction thereof.
  • the hollow body 14 is received by an outwardly open, cylindrical recess 16 of the concrete body 17 and is supported with a flange 18 provided at its outer end on the outer surface 19 of the concrete body 17 surrounding the opening of the recess 16.
  • the intermediate sc hen the hollow body 14 and the walls of the recess 16 remaining cavity is pressed with concrete or other suitable potting compound.
  • the tendons 1 1 - 13 are inside the hollow body arranged between clamping plates 20-23 made of steel or aluminum, the effective thickness, at least insofar as they are arranged between the tendons 11-13, the vertical distance of which corresponds, and the width of which is slightly smaller than the inside width of the hollow body 14.
  • clamping plates 20-23 There are a total of four Clamping plates 20-23 are provided which form a sandwich-like stack with the tendons 11-13 in such a way that each tendon is arranged between two clamping plates, this stack being via its lowest clamping plate 20 according to FIG. 2 on the lower cross leg 24 of the hollow body 14 is supported.
  • the clamping plates 20-23 have at their end portions emerging from the hollow body 14 laterally protruding, the vertical profile legs 26 and 27 of the hollow body 14 crossing, in cross-section approximately hammer-head-shaped flange pieces 28 which on the outer end faces of the profile legs 26 and 27 lie directly and secure the clamping plates 20-23 against being pulled out of the hollow body 14 in the direction of the tension acting on the tendons 11-13.
  • two wedge plates 30 and 31 are arranged in the arrangement shown in FIGS. 1 and 2, to the details of which express reference is made, between the vertical profile legs 26 and 27 Can be moved in the longitudinal direction of the hollow body 14 and can be braced against one another by means of a tensioning element 32, with which an amount defined in the longitudinal direction of the hollow body can be adjusted and can be kept largely constant.
  • the tensioning element 32 is used as a common one externally arranged tension nut 33 tensionable tie rod is formed, the anchor head 34 of which is supported on the back surface 36 of the one wedge plate 31 arranged in the region of the inner, concrete-side end of the hollow body 14, and the tension nut 33 of which is directed via one or more disc springs 37 on the outwardly facing, on the Exit side of the tendons 11-13 or the clamping plates 20-23 from the hollow body 14 arranged back surface 38 of the other wedge plate, optionally with the interposition of support plates 39 and 40 are supported.
  • the shaft 41 of the tie rod 32 which is designed as a round steel rod, runs in a central channel, which is formed by longitudinal grooves in the wedge surfaces 43 and 44 of the wedge plates 30 and 31 which abut one another.
  • the clamping force exerted by the clamping element 32 in the axial direction is transformed by the wedge plates 30 and 31 into a transverse pressure of the clamping plate tendon stack, which is uniform over the area of the tendons 11-13 is distributed.
  • a clamping length of approx. 25 cm is required and a transverse pressure of approx. 30-35N / mm 2 , a value , which can be achieved with the clamping element 32 and the wedge plate arrangement 30, 31 acting as a force transmission and conversion device without difficulty.
  • the tendons 11-13 are fitted very precisely into flat longitudinal grooves 46 of the clamping plates 20-23, so that the tendons 11-13 also on most of their narrow longitudinal surfaces from the clamping plates 20-23 are enclosed.
  • 3 shows a modification of the device 10 according to FIG. 1 in such a way that the ve anchoring body 14 is closed on its inside, where the tendons 11-13 enter, with a welded-on base plate 47 which lies directly against the concrete body 17, the clamping plates 20-23 are now supported on the inside thereof.
  • the tensile load is entered into the concrete body 17 essentially via the base plate 47, in contrast to the device 10 according to FIG.
  • the clamping plates In the design of the device according to FIG. 3, it is accordingly not necessary for the clamping plates to be provided with flange pieces 28 on their outside.
  • the bottom plate 47 provided through openings 48 are expediently designed so that their clear width and height is slightly larger than the width and thickness of the tendons 11-13 so that they can not be damaged when the clamping plate tendon stack is pressed together.
  • the arrangement of the wedge plates 30 and 31 and the tensioning element 32 can be the same as in the device according to FIG. 1, but it is also possible, as indicated by dashed lines, to support the anchor head 34 of the tensioning element on the outside of the base plate 47 facing the concrete. In this case, either a somewhat greater depth must be provided for the recess in the concrete body, or, as also indicated by dashed lines, an additional, small recess 49 receiving the anchor head 34 must be provided for this.
  • the explained with reference to Fig.3 inside support of the clamping plates 20-23 to a bottom plate 47 of the hollow bodies he p s 14 is particularly suitable in connection with the embodiment shown in F ig.4 end anchor 50 for anchoring tendons 51 and 52 , which have a square cross section of approx. 6x6 mm 2 .
  • the Veran ke - run gshohlMech 53 is a rectangular hollow profile with according 4 vertical profile legs 54 and 56 and horizontal profile legs 57 and 58 are formed.
  • the tendons 51 and 52 are divided into two groups of 12 tendons each, which in the configuration shown in FIG.
  • the end anchoring device 70 is suitable for anchoring tendons 71 with basically any cross-sectional shape, in particular round rod-shaped tendons, which are preferably grouped in the radial-symmetrical distribution shown about the longitudinal axis 72 of the device 70.
  • the apparatus 70 has a 71 open at the exit side of the tendons and closed at its inlet side by a bottom plate 73 a circular cylindrical-cup-shaped V erank fürshohl Sciences 74, which on its outside zusimpuls Lich has a radial annular flange 76 which is supported on the concrete body 17.
  • the tension element is a tie rod 77 which extends along the central axis 72, the design of which is completely analogous to that of the tension element 32 according to FIG. 1, but its anchor head 78 is on the outside
  • the force transmission device 78 is designed such that it transforms the axially directed tensioning force of the tie rod 77 into radially directed transverse forces.
  • it comprises an externally circular-cylindrical, internally conical sleeve 79 and an elongated circular truncated cone-shaped wedge body 80 which is complementary to the inner cone of the sleeve 79 and has a longitudinal bore 82 through which the shaft 81 of the tie rod 77 passes.
  • the tension nut 83 of the tie rod 78 is - again via cup springs 84 - on the larger base surface 86 of the wedge body 80
  • the tendons are full in a total of mi embedded in the t 87 designated clamping body, which, viewed in cross-section, preferably completely fills the interior space remaining between the anchoring hollow body 74 and the conical sleeve 79.
  • the cone sleeve 79 which is generally made of steel, required for the transverse pressing of the clamping body 87 and the tendons 71
  • the jacket is divided by radial longitudinal slots 88 in sectors 89.
  • the clamping body 87 is made of a very strong material such as steel or aluminum, this must also be divided by longitudinal slots so that a uniform transverse pressure of the tendons 71 can be achieved. This also applies if the clamping body 87 consists of relatively soft lead or aluminum alloys in order to achieve a good fit of its clamping surfaces to the tendons 71.
  • a suitable arrangement of such slots is shown in broken lines in FIG. after which the clamping body 87, seen in cross section g , is divided into an outer, coherent ring region 91 and an inner ring region 92 by circular-arcuate slots 90, which run between the longitudinal bores penetrated by the tendons 71, which in turn is formed by radial slots 93 in the individual tendons 71 assigned sectors 94 is divided.
  • the clamping body 87 can also be made as a one-piece part from a material that is sufficiently deformable in the radial direction, but still has sufficient strength for the transmission of force in the longitudinal direction.
  • a suitable material is, for example, mineral fillers Filled and / or reinforced with steel fibers epoxy resin.
  • the clamping body 87 can then be silvered out as a casting body, possibly made only at the place of use of the device 70, which is only poured when the anchoring hollow body 74 has already been brought into its end position supported on the concrete 17 .
  • the clamping body is made of the aforementioned, suitably reinforced epoxy resin material or consists of an elastomer, the compressive and shear strength of which is increased by suitable reinforcements or fillers while largely maintaining its deformability
  • the tendons 71 can be anchored instead of an anchoring device according to Fig.Sa, b also the anchoring device 95 shown in Figures 6a and 6b can be used.
  • a crimping plate 97 is provided which can be attached to the clamping body 96 from the outside and is displaceably guided on the anchoring hollow body 74 in the axial direction now the clamping nut 83 of the tie rod 78 via dei plate spring 8 4 supported by it .
  • Suitable material selection of squeezable clamping bodies 96 then takes over in connection with the tie rod 77 both the function of converting the axial clamping or squeezing force of the tie rod 77 into the radially acting transverse forces as well as the frictional connection of the tendons - 71 with the anchoring hollow body 74, that is to say the function the power transmission device as well as the function of the clamping device of the aforementioned embodiments.
  • a major advantage of the quasi-hydrostatic pressure distribution in the clamping or squeezing body 96 achieved by the squeezing can be seen in the fact that - in contrast to the device according to FIGS. 5a, b - no forces act on the tensioning members 71 which lead to a radial Deflection of the tendons 71 could result.
  • the anchoring device 100 according to the invention shown in FIGS. 7a and 7b whose essential difference compared to that according to FIGS. 6a, b is that a significantly softer material such as polychloroprene or sulfochlorinated polyethylene or the like is used for the squeeze body 99. can be used, which facilitates both the handling of the device 100 and the precise setting of the transverse pressure required for the frictionally anchoring of the tendons 71.
  • the movable squeeze plate 101 is at the inner, entry-side end of the circularly cylindrical anchorage hollow body 102.
  • the clamping sleeves At their exit end, the clamping sleeves have a radially projecting anchor flange 108, via which the tensile load is introduced into the abutment plate 107 and thus into the anchoring body 102.
  • the clamping sleeves 104 under the "hydrostatic" pressure of the crushed material 99 along the entire required clamping length of the necessary transverse pressure on the tendons 71, they are divided by radial longitudinal slots 109 in the manner shown in FIG. 7b into sectors 110.
  • the squeeze body 116 consists of the same material as in the device 100 according to FIGS. 7a, b.
  • a compact clamping body 118 surrounding the space between the tendons 117 and these on the outside which can be made of solid steel in the case example shown - Or aluminum block are made, which is first provided with continuous longitudinal bores for receiving the tendons 117, the diameter of which is slightly larger than the diameter of the presupposed tendons as round rods, in order to avoid the already mentioned gentle load achieve at the entry side of the device 115.
  • the device 115 has a circular cylindrical anchoring hollow body 122, which is closed on the entry side of the tendons 117 with a base plate 123.
  • the through holes 126 provided on the base plate 123 for the tendons 117 have a somewhat larger diameter than the tendons themselves.
  • the clamping body 118 is inside of the anchoring hollow body 122 so that it is supported with its coherent end on the inside of the base plate 123 in the axial direction.
  • a squeeze plate 124 guided displaceably at the opposite end of the anchoring hollow body 122 has a central recess adapted to the cross section of the clamping body 118 ng 126, through which the clamping body 118 and the free ends of the tendons exit to the outside. It is connected to a radially projecting flange 128 via a short spacer tube section 127, the length of which corresponds approximately to the maximum squeeze path of the squeeze plate 124.
  • a corresponding radially projecting anchor flange 129 is at the inlet end of the device 115 acting through the radially projecting edge of the bottom plate 123 ge strict.Zwei between the flanges 128 and 129, erank ceremoniesshohlMechs outside the V 122 are diametrically oppositely disposed tie rods 130 and 131 convey the defined adjustable bias voltage at which the compression body 118 in Axial direction is compressed so that the required for the frictional anchoring of the tendons 117 transverse pressure is achieved in the clamping body 118.
  • a suitably reinforced cast body made of metal fiber reinforced epoxy resin or the like can also be used in the device 115 according to FIG is then cast "on site" with the squeeze plate 124 removed, which for this purpose is pushed back somewhat along the tendons 117 in the direction of the pulling head, not shown, which still acts on the tendons 117.
  • prefabricated clamping or squeezing bodies are used in connection with the anchoring devices explained in accordance with FIGS. 1-8b, they can be installed in the respectively shown assembly state, in which they are pushed onto the tendons before tensioning, after tensioning the tendons in their final position are pushed into the concrete recesses that receive them, where their tensioning elements are then tensioned.
  • both the clamping members as well as the clamping sleeves or -body very and matched smoothly in their shape well to each other, it may be advantageous if between these surfaces coated on one side with feinkörmi g em Korundsplit sheet of paper or plastic If the clamping is sufficiently strong, the corundum grains can penetrate the film and penetrate both into the tendons and into the clamping sleeves or clamping bodies surrounding them, which increases the friction between these bodies and achieves better anchoring of the tendons with a given transverse pressure can be.
  • the tendons 411 and 412 are in turn formed as approximately 8 mm thick round bars which, with a horizontal or parallel arrangement, are symmetrical with respect to the horizontal longitudinal center plane 414 of the device 410 as a whole five parallel rows of seven tendons 411 and 412 each next to each other or are arranged one above the other, in the central row for a reason to be explained in the following, in addition to tendons 412 and also blind rods with the tendons 412 of corresponding nature are provided.
  • the clamping body elements 418-429 are expediently placed in their stacked arrangement on the tendons 411 and 412 and, after the tendons, the necessary before the tendons 411 and 412 are brought to the required tension by means of a tensioning press, not shown Tension-preload is impressed, pushed from the outlet side of the tendons into the end position shown in the recess 431 or the anchoring hollow body 432.
  • the clamping plates 418-425 between which the four outer rows of tendons 411 are held and which close 9, the tapered left side of the tendons 411 and 412, tapering on the central flat wedges 427 and 428, between which the middle row of tendons 412 is held, have flat wedges 426 and 429 on their outside of the recess 431 arranged end sections laterally projecting flange pieces 433, via which the tendon forces are introduced into an abutment plate 436 which is in contact with the outer surface 434 of the prestressed concrete component 413 and surrounds the opening of the recess 431, or through which a further axial displacement of these clamping body elements 418-426 and 425-429 Entry side of the tendons 411 and 412, ie towards the concrete part 413, is prevented.
  • the clamping body elements 418-429 are preferably made of steel; however, they can also be made of another material that has a strength that is sufficiently high for power transmission in the longitudinal direction.
  • the clamping plates 418-425 and the central flat wedges 427 and 428 are on their sides facing the tendons 411 and 412, respectively, with receiving grooves 442 and 443 for the tendons 411 and 412, which are neatly embedded in these grooves 442 and 443 and are enclosed on most of their circumference by the groove walls, so that between the The tendons 411 and 412 facing sides of the clamping plates 418-421 and 422-425 and the central flat wedges 427 and 428 only have narrow, approx. 1mm wide edge gaps 444 and 446.
  • the clamping body 430 overall has an approximately parallelepipedic basic shape with outer surfaces 447 and 448 of the respective outermost clamping plates 418 and 425 which run parallel to one another and with which the clamping body 430 is located on the mutually opposite inner walls of the recess 431 It is understood that these inner walls 439 and 441 must also run parallel to one another as well as possible, so that a uniform distribution of the transverse pressure of the tendons 411 and 412 over the anchoring length of the tendons is ensured. if the clamping body 430, as shown in the lower part of FIG.
  • tendons 411 and 412 are embedded in a somewhat flexible adhesive layer 452 or 453, which, to compensate for unevenness in the clamping element elements and the tendons, clings to the surface and thus provides a uniform distribution of the transverse pressure over the anchoring length.
  • a plastically deformable material or an elastomer reinforced with metal or glass fiber or with ceramic fillers can be considered as material for such an adhesive layer.
  • the adhesive layer 452 or 453 can either, as shown in the lower part of FIG .1-2mm thick coating of the tendons 411, or, as shown in connection with the central flat wedges 427 and 428 and the clamping plates 418-421 arranged above, be formed as a coating of these clamping body elements, in which case the adhesive layers 453 or 454, the clamping members 412 , .411 depending Rail.Diese half enclosing half-shell 453 ang.454 coatings of the clamping body members can either be formed as a relatively thin-walled, the contour of reception groove 442 the following layers 454, or massive than Comparatively, optionally in the K lemm- body elements recessed plates 453, the thickness of which is at least approx.
  • Adhesive layers 452-454 also convey the function of the compensation layers 450 and 451. The in the Fig.
  • the device 510 comprises a cylindrical-pot-shaped anchoring hollow body 513, which over most of its length is covered by a likewise pot-shaped-cylindrical recess 514 of the prestressed concrete component 51; is received in the central bottom portion of the penetrated by the clamping members 511 clamping channel 516 of the pre-stressed concrete component 512 mündet.Der of the tendons 511 and this surrounding clamping sleeves 517 penetrated in its longitudinal direction anchoring hollow body 513 is at its inner, the S pannkanal 516 facing end, where the tendons 511 enter the anchoring device 510 is completed with a base plate 519 provided with through openings 518 for the tendons 511 or the gill sleeves 517 surrounding them.
  • the anchoring hollow body 513 is is provided with a radially projecting ring flange 521, with which it is supported on the outer wall section 522 of the prestressed concrete component 512 delimiting the outlet-side opening of the recess 514.
  • the outlet-side opening of the anchoring hollow body 513 is parallel to a base plate 519 except for a narrow edge gap 523 len, lengthways Direction of the tendons 511 slidably at the outer end of the cylindrical shell 524 of the anchoring hollow body 5 13 covered crush plate 526 covered, which in turn is provided with the through openings 518 of the bottom plate 519 aligned through openings 527 for the clamping sleeves 511 enclosing the tendons 511.
  • the substantially elongated-tubular trained ferrules 517 are provided at their outlet end with flange pieces 528 protruding radially from the sleeve shell, with which they are supported in the illustrated position of use of the device 510 on the outer surface 529 of the squeeze plate 526.
  • a body 530 which fills this and is made of a material that can be expanded by squeezing, such as polychloroprene, sulfochlorinated polyethylene or the like, which shifts the quetsc Axial tensile or prestressing forces in the interior of the anchoring hollow body 513, which mediate axial plate 526 toward the base plate 519, are converted into a "hydrostatic" drusk proportional to the amount thereof and thus also into transverse forces directed transversely to the clamping sleeves 517 and tendons 511, which, when the squeezing body 530 is adequately squeezed, converts one Provide sufficient transverse pressure for the clamping sleeves 517 for the frictional fixation of the tendons 511.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Reinforcement Elements For Buildings (AREA)
EP83104139A 1979-08-13 1980-08-13 Système pour l'ancrage d'extrémité d'au moins une barre de tension en un matériau composite fibreux dans des constructions en béton précontraint Expired EP0098927B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AT83104139T ATE47612T1 (de) 1980-08-13 1980-08-13 Vorrichtung zur endverankerung mindestens eines als spannglied im spannbetonbau eingesetzten stabes aus faser-verbundwerkstoff.
EP83104139A EP0098927B1 (fr) 1979-08-13 1980-08-13 Système pour l'ancrage d'extrémité d'au moins une barre de tension en un matériau composite fibreux dans des constructions en béton précontraint

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
DE2932809 1979-08-13
DE2935419 1979-12-04
DE2951088 1979-12-19
DE2951015 1979-12-19
DE2950303 1979-12-19
EP83104139A EP0098927B1 (fr) 1979-08-13 1980-08-13 Système pour l'ancrage d'extrémité d'au moins une barre de tension en un matériau composite fibreux dans des constructions en béton précontraint

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
EP80104782.0 Division 1980-08-13

Related Child Applications (1)

Application Number Title Priority Date Filing Date
EP89101508.3 Division-Into 1980-08-13

Publications (3)

Publication Number Publication Date
EP0098927A2 true EP0098927A2 (fr) 1984-01-25
EP0098927A3 EP0098927A3 (en) 1985-11-06
EP0098927B1 EP0098927B1 (fr) 1989-10-25

Family

ID=8190435

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83104139A Expired EP0098927B1 (fr) 1979-08-13 1980-08-13 Système pour l'ancrage d'extrémité d'au moins une barre de tension en un matériau composite fibreux dans des constructions en béton précontraint

Country Status (2)

Country Link
EP (1) EP0098927B1 (fr)
AT (1) ATE47612T1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0227546A2 (fr) * 1985-12-16 1987-07-01 Freyssinet International (Stup) Perfectionnements aux dispositifs pour exercer une traction sur un tirant avant ancrage
EP0291601A1 (fr) * 1987-05-21 1988-11-23 Mitsubishi Mining & Cement Co., Ltd. Méthode de fabrication de dispositifs d'ancrage d'une pluralité d'éléments pour béton précontraint
EP0363779A1 (fr) * 1988-10-08 1990-04-18 Dyckerhoff & Widmann Aktiengesellschaft Dispositif d'ancrage pour une barre de tension formée d'un matériau composite fibreux
EP0629753A1 (fr) * 1993-06-18 1994-12-21 Vsl France Dispositif d'ancrage démontable de câbles précontraints

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1958882A1 (de) 1968-11-26 1970-06-18 Coyne & Bellier Vorspannungs- bzw. Tragseil und Vorrichtungen zu seiner Verankerung

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1503134A (fr) * 1966-12-01 1967-11-24 Clavette à <<serrage circulaire>> pour le blocage d'ensemble de fils, barres ou câbles tendus
DE1659236A1 (de) * 1967-08-05 1971-01-07 Clasen Schulz Dipl Ing Georg Das Koppeln von gebuendelten Spanngliedern
FR1556234A (fr) * 1967-10-09 1969-02-07
DE2512114A1 (de) * 1975-03-19 1976-09-30 Intercontinentale Technik Gmbh Endverankerung fuer spannelemente
DE2522807C3 (de) * 1975-05-23 1980-05-08 Philipp Holzmann Ag, 6000 Frankfurt Klemmverankerung

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1958882A1 (de) 1968-11-26 1970-06-18 Coyne & Bellier Vorspannungs- bzw. Tragseil und Vorrichtungen zu seiner Verankerung

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0227546A2 (fr) * 1985-12-16 1987-07-01 Freyssinet International (Stup) Perfectionnements aux dispositifs pour exercer une traction sur un tirant avant ancrage
EP0227546A3 (en) * 1985-12-16 1988-07-20 Freyssinet International (Stup) Devices for stressing tendons before anchoring
EP0291601A1 (fr) * 1987-05-21 1988-11-23 Mitsubishi Mining & Cement Co., Ltd. Méthode de fabrication de dispositifs d'ancrage d'une pluralité d'éléments pour béton précontraint
EP0363779A1 (fr) * 1988-10-08 1990-04-18 Dyckerhoff & Widmann Aktiengesellschaft Dispositif d'ancrage pour une barre de tension formée d'un matériau composite fibreux
EP0629753A1 (fr) * 1993-06-18 1994-12-21 Vsl France Dispositif d'ancrage démontable de câbles précontraints
FR2706508A1 (fr) * 1993-06-18 1994-12-23 Vsl France Dispositif d'ancrage démontable de câbles précontraints.

Also Published As

Publication number Publication date
EP0098927B1 (fr) 1989-10-25
EP0098927A3 (en) 1985-11-06
ATE47612T1 (de) 1989-11-15

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