EP0232944B1 - Dispositif pour ancrer un tirant et procédé pour préparer du béton précontraint - Google Patents

Dispositif pour ancrer un tirant et procédé pour préparer du béton précontraint Download PDF

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Publication number
EP0232944B1
EP0232944B1 EP87200180A EP87200180A EP0232944B1 EP 0232944 B1 EP0232944 B1 EP 0232944B1 EP 87200180 A EP87200180 A EP 87200180A EP 87200180 A EP87200180 A EP 87200180A EP 0232944 B1 EP0232944 B1 EP 0232944B1
Authority
EP
European Patent Office
Prior art keywords
tendon
clamping body
housing
anchoring
longitudinal direction
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.)
Expired - Lifetime
Application number
EP87200180A
Other languages
German (de)
English (en)
Other versions
EP0232944A3 (en
EP0232944A2 (fr
Inventor
Cornelis Of Cleton
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.)
Akzo NV
Hollandsche Beton Groep NV
Original Assignee
Akzo NV
Hollandsche Beton Groep NV
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.)
Filing date
Publication date
Application filed by Akzo NV, Hollandsche Beton Groep NV filed Critical Akzo NV
Priority to AT87200180T priority Critical patent/ATE57409T1/de
Publication of EP0232944A2 publication Critical patent/EP0232944A2/fr
Publication of EP0232944A3 publication Critical patent/EP0232944A3/en
Application granted granted Critical
Publication of EP0232944B1 publication Critical patent/EP0232944B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • E04C5/122—Anchoring devices the tensile members are anchored by wedge-action

Definitions

  • the invention relates to a process for the manufacture of prestressed concrete, in which prestressing of the concrete is effected by means of at least one elongated tendon, which is tensioned while subjected to an external tensile load, said external tensile load being removed thus prestressing the concrete matrix and being exerted by tensioning said tendon by means of an anchoring device, which device comprises a clamping body contained in an anchoring housing so that said external tensile load may be exerted in longitudinal direction of the tendon, the anchorage housing or an element coupled with it and the clamping body, which is substantially formed of a synthetic material, being provided with cooperating contact surfaces which are in a slanting position relative to the tendon, for transmitting the external tensile load to the tendon, which slanting surfaces are positioned at an acute angle with the longitudinal direction of the tendon which extends from the inside of the device to some other point of attachment, said clamping body consists of two or more solid parts and forms a block-shaped, compact
  • the tensile force prevailing in the tendon will vary. At the point in the anchoring device where the tendon leaves the clamping body while subject to the full tension lead or prestress, i.e. on the inside of the anchoring device, there will prevail the maximum tensile force in the tendon. At the other side, called the end face, of the anchoring device where the tendon enters the clamping body while in the tension less state, there will prevail practically no tensile force in the tendon. Therefore, the magnitude of the tensile force in the tendon held by the clamping body will vary from a maximum value near the inside to a value nil near the end face of the anchoring device.
  • the tensile force acting in longitudinal direction of the tendon is transmitted to the anchorage housing as a result of the friction between the tendon and the clamping body.
  • transverse forces will be exerted between the tendon and the clamping body, which forces are directed perpendicular to the longitudinal direction of the tendon, their magnitude being dependent on the tensile forces. Consequently, on the inside of the anchoring device there will generally prevail an unfavourable biaxial state of stress in the tendon as a result of the combination of a maximum tensile force and a maximum transverse force. From the inside to the end face of the anchoring element both the tensile force and the transverse force in the tendon will gradually decrease.
  • the anchoring device according to Fig. 1 of EP 0 025 856 B1 which is particularly meant for anchoring tendons formed of a synthetic matrix reinforced with fibres, such as glass fibres or carbon fibres, comprises an internally conical anchoring housing.
  • a conical clamping body of synthetic material In the conical housing is a conical clamping body of synthetic material.
  • a buffer layer of a compressible synthetic material such as polyvinyl chloride.
  • Symmetrical with the longitudinal axis are a number of tendons in the anchoring device.
  • the clamping body must be formed by pouring a liquid epoxy resin, optionally reinforced with fillers or fibres, into the conical bore of the anchorage housing. Then the resin is left until it is sufficiently cured, during which process the tensioning device remains in operation. During the curing of the epoxy resin the tendons will irremovably adhere to the clamping body. After the resin curing process the tensile force exerted by the tensioning device may be reduced, preferably gradually. The then hard conical clamping body together with the fixed tendons will shift relative to the housing toward the inside of the anchoring device, with the buffer layer becoming compressed and finally acting as a "hard” abutment plate. In this way the clamping body will be sufficiently compressed in transverse direction to retain the tendons and moreover the magnitude of the transverse forces acting transverse to the longitudinal direction of the tendons will be restricted.
  • a liquid epoxy resin optionally reinforced with fillers or fibres
  • the casting of clamping bodies from epoxy resin requires special skill.
  • Another disadvantage consists in that the tensioning device must remain in operation until the resin is sufficiently cured. This is not only time consuming, but may also lead to serious defects in the event of the tensioning device already being out of operation at a moment when the resin is still insufficiently cured.
  • the known anchoring system is not very economical. For, it can be used only once, in that it is fixedly cast in the concrete element and the cured clamping body cannot be re-used.
  • the anchoring system according to Figure 6 of EP 0 025 856 B1 also comprises a buffer layer serving as a limiting means for the transverse forces, it is somewhat different.
  • a considerable disadvantage to the anchoring system according to Fig. 6 of EP 0 025 856 B1 consists in that the fibre-reinforced tendons of synthetic material are in direct contact with and fixed by a heavily constructed clamping body of steel or aluminium. Therefore, the softer synthetic tendons may be readily damaged, so that there will be an increased chance of failure under the influence of the high tensile force and the transverse force, which although it is limited is still considerable.
  • the metal clamping body in the anchorage housing is surrounded by a compressible material serving as buffer, which is to be subjected to the appropriate pressure by means of bolts and nuts.
  • Said buffer may be up of several layers.
  • the magnitude of the transverse force exerted by bolts is difficult to control. For, the force exerted will depend on the stiffness of the plates, the stiffness of the bolts and the friction between bolts and nuts. Besides, it is not known whether the surfaces properly join. The construction of this known anchoring system and it use in actual practice will therefore be rather complicated. As also this known construction is fixedly cast in the pre-stressed concrete elements, it can only be used once.
  • DE 2 515 423 describes an anchoring device for a flat tendon made up of 31 steel wires measuring 1 mm in diameter, which are embedded in synthetic material and surrounded by an impervious sheath. The tendon is clamped between two clamping plates, apparently of a relatively hard material such as steel, which are on their outside provided with wedge shaped clamping surfaces that cooperate with matching surfaces of the steel anchorage housing. To reduce the chance of damage and fracture of the tendon an additional clamping plate in the form of some kind of buffer layer is placed between the tendon and the two clamping plates over the entire clamping length thereof.
  • Said buffer may consist of, for instance, an aluminium plate or a layer of elastomeric material, such as rubber or plastic.
  • the relatively thick buffer layers on either side of the tendon serve to bring about a more equal transmission of transverse force between the tendon and the clamping plates and the transverse force will be approximately constant over the entire length. Nevertheless, the transverse force on the inside of the anchoring device will have a fairly high value, as will the tensile force, as a result of which the aforementioned unfavourable biaxial state of stress may occur.
  • the clamping plate in the form of a buffer layer particularly when use is made of a large number of tendons, which in reality will be general practice rather than exceptional, the presence of the resulting additional layers will increase the chance of creep.
  • NL 7 702 741 describes an anchoring device for a synthetic tendon reinforced with glass fibres, which at least at the point where the tensile force is introduced is built up of several layers between each of which metal wedges are provided. Also in the anchoring device according to NL 7 702 741 the transverse force will be maximal on the inside, which is unfavourable. Further, the great difference in hardness between the metal. wedges and the tendon of synthetic material will considerably enhance the chance of damage to the tendon, which will readily give rise to fracture.
  • GB 1 139 841 describes a gripping device for ropes, in particular for ropes having a parallel filamentary core.
  • the rope is split to assume an annular form, use being made of a loose cone which is forced into the core of the rope end.
  • the annular rope end is clamped between the conical wall of a housing and the loose cone with the aid of a nut.
  • the two cooperating cones In order to provide a constant annular area with increasing diameter the two cooperating cones have such different slopes that the annular slit will narrow with increasing diameter.
  • This anchoring device is of a totally different type in that the tendon in it is anchored between the clamping body and the anchorage housing. This device is not suitable for anchoring fibre-reinforced synthetic tendons in the manufacture of pre-stressed concrete.
  • DE 1 609 722 shows a device for anchoring a plurality of wires in a structural element.
  • the wires which are expanded at their ends, are flaringly placed in a relatively wide bore provided in the structural element.
  • the bore will then be provided with a filler of metal granules and an optionally thermoplastic binder.
  • This type of system is unsuitable for anchoring fibre-reinforced synthetic elements in the manufacture of prestressed concrete.
  • NL 6 413 152 shows an anchoring system for a number of steel wire cables, which are clamped in the annular opening between two cones of steel, one of which is provided with a roughed surface.
  • US 3 111 569 relates to a fibre reinforced tendon of another type with thickened ends of an eye-like shape (se Fig. 3-7) like certain steel tendons.
  • thickened ends of an eye-like shape (se Fig. 3-7) like certain steel tendons.
  • said thickened ends will lead to several disadvantages, such as unfavourable and unequal stress situations, many tendons with different lengths and a wide variety of distances between said thickened ends.
  • NL 293 083 describes an anchoring device for tendons consisting of steel. Surprisingly, according to the present invention it was found that this type of anchoring device is particularly suitable for use in a process for the manufacture of prestressed concrete using fibre-reinforced tendons.
  • the invention has for its object to provide a process for the manufacture of prestressed concrete of the type mentioned in the opening paragraph which no longer displays said disadvantages of known systems.
  • the process according to the invention is characterized in that a tendon is applied, which is formed by a matrix based on a thermoplastic or a thermosetting synthetic material, such as epoxy resin and/or bismaleimide resin or unsaturated polyester resin, containing more than 5000, more particularly more than 20,000, practically parallel continuous filaments formed from a material selected from the group of aromatic polyamides, such as polyparaphenylene terephthalamide, or carbon or glass or from solvent spun polyethylene, polyvinylalcohol or polyacrylonitrile.
  • a tendon is applied, which is formed by a matrix based on a thermoplastic or a thermosetting synthetic material, such as epoxy resin and/or bismaleimide resin or unsaturated polyester resin, containing more than 5000, more particularly more than 20,000, practically parallel continuous filaments formed from a material selected from the group of aromatic polyamide
  • the clamping body extending over at least 50-80% of the length of the anchorage housing.
  • the clamping body is substantially formed of a thermoplastic synthetic material, such as nylon 6, nylon 6,6, polyester, polyethylene or polypropylene, and the hardness value of the clamping body is lower, preferably about 10 to 15%, than that of the tendon, as determined in conformity with the Shore-D hardness measurement, and the anchorage housing, which may formed of, for instance, alloyed structural steel, has a greater stiffness than the clamping body, particularly transverse to the longitudinal direction of the tendon.
  • the ratio of the thickness to the width is smaller than 1:2, and more particularly is in the range of 1:8 to 1:90.
  • a preferred embodiment of the anchoring device according to the invention is characterized in that the acute angle a which said cooperating sloping surfaces of the anchorage housing and the clamping organ make with the longitudinal direction of the tendon is in the range of about 0.5 to 15 ° .
  • a simple embodiment of the device according to the invention is characterized in that in the anchorage housing the sloping surface is formed by a conical bore of which the cone which cooperates with the conical bore in the anchorage housing and may consist of two or more parts provided with a recess for receiving a tendon at the common boundary surfaces of said parts.
  • a practical embodiment of the device according to the invention is characterized in that of the sloping surface in the anchorage housing the height decreases towards the inside and the claming body is formed by an undivided or divided wedge-shaped element cooperating with said sloping surface in the anchorage housing, which wedge-shaped element is provided with a recess for receiving a tendon.
  • an anchoring device which is characterized according to the invention in that the tendon has a substantially rectangular cross-section transverse to the longitudinal direction, of which the ratio of the thickness to the width is smaller than 1:2, and the height of the recess for the tendon in the clamping body, measured transverse to the width of the tendon, is at least 10% smaller, preferably 20 to 60% smaller than the thickness of the tendon.
  • the clamping body may be provided with a recess of which the diameter is at least 10% smaller than the diameter of the tendon.
  • the anchoring device according to the invention is characterized in that on the inside of the anchoring device the end edge of the clamping body in contact with the tendons is rounded, more particularly to a radius of at least 0.5 mm, preferably 1-4 mm.
  • the anchoring device according to the invention is in essence particularly simple and effective.
  • the synthetic clamping body in the form of a block-shaped element ready for use and consisting of a cone or wedge can be directly inserted in the anchorage housing and be placed in its proper position on the tendons.
  • the clamping body first can be formed from a thermosetting compound, the clamping organ can without delay or difficulty and regardless of weather conditions be inserted into the anchorage housing, irrespective of the position in which the same is placed.
  • Another advantage to the anchoring device according to the invention consists in that it need not be cast into the concrete and can therefore often be re-used, as a result of which the cost thereof can be reduced considerably. Owing to the absence of specially adjustable means of limiting transverse forces or other means the anchoring device is particularly simple to manufacture.
  • the simple construction of the anchoring device according to the invention permits problem-free application in actual practice, without requiring any special operating instructions.
  • the invention also comprises prestressed concrete structures or elements made by the process according to the invention.
  • FIGS 1-5 are schematic illustrations of a first embodiment of the anchoring device suitable for the process according to the invention.
  • the anchorage housing 1 of alloyed steel has a conical bore 2, the angle of inclination of the bore being indicated by the acute angle ⁇ .
  • In the bore 2 are two half cones 3 and 4 of nylon 6, of which the angle of inclination is also a and which together form a clamping body for the tendon in the form of a flat strip 5.
  • One the anchorage housing is a collar 6 on which an external tensile force may be exert in the direction of the arrows 7 by means of a hydraulic or mechanical device not shown in the drawing.
  • the sloping surfaces of the conical bore 2 in the anchorage housing and of the clamping body both make the same acute angle a with the longitudinal direction of the tendon.
  • the tendon 5 projects outside the end face 9 of the anchoring device over a distance of, say, 5 mm and transversely extends through the clamping body in a recess 8 formed in one of the cones 3, 4 towards the inside 10 of the anchoring device. From the inside 10 the tendon 5 extends through formwork (not shown) to a fixed point (not indicated in the drawing), which may be several metres away from the inside 10, the distance depending on the concrete element to be made.
  • the tendon 5 in this construction consists of a strip of about 20 x 1,3 mm formed by an epoxy resin matrix containing 10,000 endless polyparaphenylene terephthalamide filaments each having a diameter of about 12 11m.
  • the breaking load of such a tendon is at least 35 kN.
  • the tensile force is initiated by applying to the anchorage housing 1 and external tensile force in the direction indicated by the arrows 7.
  • Said external tensile force is transmitted to the cooperating sloping surfaces of the conical bore 2 and the half cones 3, 4 of the clamping body via pressure and frictional forces.
  • the transverse forces in the direction indicated by the arrows 12 set up frictional forces in the longitudinal direction of the tendon 5. In the clamping body these frictional forces are directed as indicated by the arrow 13 and set up the prestressing force in the tendon.
  • FIG. 6-12 are separate views of the most important parts used for a particularly embodiment of the anchoring device suitable for the process according to the invention.
  • Figure 6 is a view in longitudinal section of the anchorage housing 1 of alloyed structural steel 42 CrMo 4 .
  • the acute angle a between the wall of the conical bore 2 and the longitudinal axis of the tendon is about 3.5 ° .
  • the anchorage housing has a length of about 100 mm and at the two ends the inner diameters of the bores are about 45 mm and 33 mm, and the outer diameters are about 63 mm and 47 mm, respectively.
  • the collar 6 has a length of about 30 mm.
  • the clamping body consists of two half cones 3 and 4, which are drawn in Figures 7-12 and of which the acute angle a with the longitudinal axis of the tendon is also 3.5 ° .
  • the axial length of the half cones 3 and 4 is about 95 mm.
  • Figures 9 and 10 are views of the nylon 6 cones 4 and 3, respectively, viz. of the sides having the largest diameter. At the end of the largest diameter the radii of curvature of the two half cones are 22.5 mm. At the end of the smallest diameter the radii of curvature of the two cones are about 16.5 mm.
  • the half cone 4 is semi-circular in cross-section all along its length.
  • the half cone 3 is provided all along its length with a recess 8 having a width of about 22 mm and a depth of about 0.75 mm for receiving the described tendon 5 measuring about 20 x 1.3 mm. Except for the recess the cone 3 is also semi-circular all along its length.
  • the end edges of the clamping body that are in contact with the tendon 5 are rounded to a radius R of 2 mm.
  • the tendon has a hardness of 88-89 and the nylon 6 clamping body has a hardness of 78-80, both hard- nesses being Shore-D values.
  • FIG. 13 and 14 are views respectively in longitudinal section and in side elevation of a different embodiment of the anchoring device suitable for the process according to the invention, corresponding parts being referred to by like numerals.
  • This embodiment comprises three tendons 5, which are enclosed in a steel anchorage housing 1 by means of two nylon 6 wedges 22, 23 and flat plates 24, 25 which are also of nylon 6.
  • the flat sloping surfaces of the wedges 22, 23 cooperate with the corresponding flat wedge surfaces in the anchorage housing 1.
  • Figures 15 and 16 show an embodiment in which three superimposed tendons 5 are held together by a clamping body formed by two wedges 22, 23 of nylon 6, which cooperate with corresponding wedge surfaces in the anchorage housing 1.
  • Figures 17 and 18 show an embodiment in which three adjacent tendons 5 are clamped together in the housing 1 between two wedges 22 and 23 of nylon 6.
  • Figure 19 shows an embodiment in which a great many anchoring units 26, for instance of the type according to Fig. 17, 18 or Fig. 15, 16 or Fig. 13, 14 are contained in one and the same block 27.
  • Figures 20 and 21 show an embodiment which also is provided with an internal conical anchorage housing 1 containing a cone of nylon 6 consisting of three parts 28, 29 and 30 for anchoring a tendon 5 having a circular cross-section.
  • the three parts 28, 29 and 30 together form the clamping body.
  • the cooperating sloping surfaces are not necessarily conical or wedge shaped and in principle also curved sloping surfaces may be used.
  • the anchoring system according to the invention may also in that case be provided with a great many adjacent and/or superimposed tendons contained in one and the same anchorage housing.
  • the invention also comprises embodiments in which during pretensioning a thin sheet material is provided at the contact surface between the one or multiple-part clamping body and the tendon, so that there is still a practically direct contact between the clamping body and the tendon.
  • the clamping organ of synthetic material may optionally contain a certain amount of filler, such as glass fibres or a mineral material.
  • the filaments of polyparaphenylene terephthalamide contained in the tendons may be of the type described in US 4 320 081.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Reinforcement Elements For Buildings (AREA)
  • Manufacturing Of Tubular Articles Or Embedded Moulded Articles (AREA)
  • On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
  • Devices For Post-Treatments, Processing, Supply, Discharge, And Other Processes (AREA)
  • Piles And Underground Anchors (AREA)

Claims (4)

1. Un procédé de fabrication de béton précontraint dans lequel la précontrainte du béton est effectuée au moyen d'au moins un tirant ou élément de précontrainte (5) allongé qui est mis sous tension tout en étant soumis à une charge extérieure à la traction, cette charge extérieure à la traction étant retirée pour précontraindre ainsi la matrice de béton et étant exercée par mise sous tension de ce tirant (5) au moyen d'un dispositif d'ancrage, ce dispositif comprenant un corps de serrage (3, 4, 22, 23, 28, 29, 30) contenu dans un logement d'ancrage (1) de telle sorte que cette charge extérieure à la traction puisse être exercée suivant la direction longitudinale du tirant, le logement d'ancrage (1) ou un élément couplé à celui-ci et le corps de serrage (3, 4, 22, 23, 28, 29, 30) qui est sensiblement formé d'une matière synthétique étant pourvu de surfaces de contact coopérantes en position inclinée par rapport au tirant (5), en vue de transmettre la charge extérieure à la traction au tirant (5), lesquelles surfaces inclinées sont disposées à un angle aigu a avec la direction longitudinale du tirant (5) qui s'étend de l'intérieur (10) du dispositif à un autre point d'attache, ledit corps de serrage étant constitué de deux ou de plus de deux pièces (3, 4, 22, 23, 28, 29, 30) massives et formant un élément compact, en forme de bloc, dont les parties sont déjà solides avant l'insertion dans le logement d'ancrage (1), le corps de serrage (3, 4, 22, 23, 28, 29, 30) étant, pendant la tension couplé directement, mais étant détachable, au tirant (5) par un contact avec frottement et une force de pression, procédé caractérisé en ce que l'on utilise un tirant (5) formé par une matrice à base de matière synthétique thermoplastique ou thermodurcissable, telle que par exemple une résine époxy et/ou une résine de bisma- léimide ou une résine de polyester insaturé contenant plus de 5000, notamment plus de 20 000, filaments continus pratiquement parallèles constitués d'une matière choisie dans le groupe des polyamides aromatiques, par exemple du polyparaphénylèneté- rephtalamide, du carbone ou du verre, ou du polyéthylène,
de l'alcool polyvinylique ou polyacrylonitrile filés à l'aide d'un solvant.
2. Un procédé selon la revendication 1, caractérisé en ce que l'on utilise un tirant (5) dont la section droite par rapport à sa direction longitudinale est sensiblement rectangulaire.
3. Un procédé selon la revendication 2, caractérisé en ce que le rapport de l'épaisseur à la largeur de cette coupe approximativement rectangulaire est inférieur à 1/2 et pratiquement compris entre 1/8 et 1/90.
4. Un procédé selon la revendication 1, caractérisé en ce que l'on utilise un corps de serrage (3, 4, 22, 23, 28, 29, 30) dont l'indice de dureté est inférieur, de préférence d'environ 10 à 50%, à celui du tirant (5), les mesures de dureté étant déterminées en conformité aux procédés de mesure de dureté Shore-D.
EP87200180A 1986-02-14 1987-02-06 Dispositif pour ancrer un tirant et procédé pour préparer du béton précontraint Expired - Lifetime EP0232944B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87200180T ATE57409T1 (de) 1986-02-14 1987-02-06 Einrichtung zur verankerung eines zugelements und verfahren zur zubereitung vorgespannten betons.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL8600370 1986-02-14
NL8600370 1986-02-14

Publications (3)

Publication Number Publication Date
EP0232944A2 EP0232944A2 (fr) 1987-08-19
EP0232944A3 EP0232944A3 (en) 1988-01-07
EP0232944B1 true EP0232944B1 (fr) 1990-10-10

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EP87200180A Expired - Lifetime EP0232944B1 (fr) 1986-02-14 1987-02-06 Dispositif pour ancrer un tirant et procédé pour préparer du béton précontraint

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Country Link
EP (1) EP0232944B1 (fr)
AT (1) ATE57409T1 (fr)
DE (1) DE3765433D1 (fr)
ES (1) ES2018675B3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105970956A (zh) * 2016-07-06 2016-09-28 中国京冶工程技术有限公司 一种用于frp筋的夹片式锚具及使用其的锚固方法

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1236723B (it) * 1989-10-16 1993-03-26 Rdb Nord Spa Impianto e metodo per la tesatura dei cavi per la realizzazione su pista di manufatti in calcestruzzo armato precompresso.
WO2015049395A1 (fr) * 2013-10-03 2015-04-09 Acciona Infraestructuras, S.A. Dispositif de retenue
CN103741885B (zh) * 2013-12-21 2016-03-09 广西科技大学 碳纤维板张拉用的夹片式锚具
JP6869083B2 (ja) * 2017-04-11 2021-05-12 三井住友建設株式会社 Ｆｒｐ緊張材の定着装置
CN113585796B (zh) * 2021-06-28 2022-07-22 东南大学 一种frp板锚固装置及锚固方法

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Publication number Priority date Publication date Assignee Title
US3111569A (en) * 1958-06-20 1963-11-19 Rubenstein David Packaged laminated constructions
FR1237901A (fr) * 1959-06-25 1960-08-05 Stup Procedes Freyssinet Perfectionnements aux dispositifs d'ancrage des armatures de précontrainte
NL293083A (nl) * 1962-05-23 1965-07-26 Hutten Und Bergwerke Rheinhausen Ag Wigverankering voor wapeningsstaven voor voorgespannen beton
BE654007A (fr) * 1963-11-12 1965-02-01
AT328156B (de) * 1974-04-26 1976-03-10 Felten & Guilleaume Ag Oester Verankerungsvorrichtung fur verbundstrange aus einem kunststoffkorper und in diesen eingebetteten insbesondere parallelen drahten
US4297414A (en) * 1978-07-07 1981-10-27 Mitsui Petrochemical Industries, Ltd. Reinforcing material for hydraulic substances and method for the production thereof
US4483727A (en) * 1983-02-07 1984-11-20 Celanese Corporation High modulus polyethylene fiber bundles as reinforcement for brittle matrices

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105970956A (zh) * 2016-07-06 2016-09-28 中国京冶工程技术有限公司 一种用于frp筋的夹片式锚具及使用其的锚固方法

Also Published As

Publication number Publication date
EP0232944A3 (en) 1988-01-07
DE3765433D1 (de) 1990-11-15
ES2018675B3 (es) 1991-05-01
ATE57409T1 (de) 1990-10-15
EP0232944A2 (fr) 1987-08-19

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