EP2239119B1 - Banc de précontrainte mobile pour éléments en béton précontraint - Google Patents

Banc de précontrainte mobile pour éléments en béton précontraint Download PDF

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Publication number
EP2239119B1
EP2239119B1 EP20100003732 EP10003732A EP2239119B1 EP 2239119 B1 EP2239119 B1 EP 2239119B1 EP 20100003732 EP20100003732 EP 20100003732 EP 10003732 A EP10003732 A EP 10003732A EP 2239119 B1 EP2239119 B1 EP 2239119B1
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Prior art keywords
abutment
elements
tensioning
bed according
traction
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EP20100003732
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German (de)
English (en)
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EP2239119A2 (fr
EP2239119A3 (fr
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Thomas Friedrich
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B23/00—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects
    • B28B23/02—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members
    • B28B23/04—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members the elements being stressed
    • B28B23/043—Wire anchoring or tensioning means for the reinforcements

Definitions

  • the invention relates to a mobile fitted bed for precast concrete elements with prestressed reinforcement according to the preamble of claim 1.
  • prefabricated concrete elements in the precast plant characterized in that the precast concrete element is made on the surface of a circulation pallet, wherein in a known manner, the circulation pallet has a clamping frame to receive the prestressed reinforcing strands under pretension in the clamping frame.
  • the ready-mixed concrete is then poured, so that the prestressed reinforcing strands are taken up in the ready-mixed concrete and bias the finished concrete part after curing of the ready-mixed concrete.
  • profile beams must be suitably reinforced in order to reduce the occurring buckling and absorb bending forces.
  • a tenter frame weighs up to 15 t with a size of approximately 4 x 16 m.
  • JP-A-2001 310 318 discloses a fitted bed for the production of precast concrete elements with prestressed reinforcement according to the preamble of claim 1.
  • the invention is therefore the object of developing a clamping device for circulating pallets of the type mentioned so that it is designed to be much smaller, less expensive to produce and is freely convertible.
  • the invention is characterized by the technical teaching of claim 1.
  • An essential feature of the invention is that instead of the known tenter, which was firmly connected to the circulation pallet, a mobile fitted bed is used, which is simply placed on the surface of the circulation pallet.
  • the invention now proposes to use a self-supporting, independent of the clamping frame, and inherently stiff clamping bed. This is therefore easy to transport and no longer rely on the attachment with the circulation pallet.
  • the clamping bed according to the invention consists of two opposing abutment plates, between which one or more abutment profiles are arranged, which press the two abutment plates against each other by means of a clamping device.
  • each abutment plate In the lower part of each abutment plate one or more strand-like or wire-like or rod-like reinforcing elements are arranged, which are assigned to the respective abutment plate respectively associated tension elements, which also consist of strands, wires or rod-shaped elements.
  • the advantage is now achieved for the first time that the abutment plates with the intermediate abutment profiles are statically balanced in itself, because the underlying wire-like or strand-like reinforcing elements are now according to the invention opposite upper tension elements, which are connected to the abutment plates 7, 8 and which take up the same train as comparatively the lower reinforcing elements.
  • the actual tensile force is thus transmitted between the abutment plates via the abutment profiles arranged centrally therebetween, which press with a tensioning device against the respective abutment plate.
  • a clamping device is arranged, which presses with one side on the end face of the abutment profile and with the other end face on the abutment plate.
  • Such a clamping device is preferably designed as a piston hydraulic cylinder device.
  • eccentric tensioning devices can be used, which are operated by hand or by motor or hydraulic.
  • the pulling device acts on the abutment plate from the outside and pulls the abutment plate away from the abutment profile.
  • the steel plates form the abutment yoke for receiving the strands with their anchors. Therein, the openings for the layered mounting of the permanent and temporary anchor boxes are attached.
  • the steel plates are standing on the formwork floor and thus determine the altitude of the exciting strands.
  • the later structurallybetonierenden in the component strands are arranged in the lower region of the steel plate near the formwork base according to their subsequent axial position. Supplementary so-called auxiliary strands in the upper part of the steel plates are required. These hold the balance of forces around the axis of the pressure tube. These strands can be used over and over again, so can be used for monolayers in PE sheath. Its associated anchoring is permanent and always remains fixed to the steel plate.
  • the two steel plates and the pressure tube with the intermediate cylinder form a stable unit that can move as a whole, settle on the formwork and also lift off.
  • Pipe, cylinder and steel plates are bolted together.
  • the upper auxiliary strands always remain fixed to the unit. This applies both in the tensioned and in the relaxed state.
  • the Medbetonierenden strands are fixed in position on the steel plates, aligned and slightly tense.
  • All strands bottom + top
  • the cylinder is fixed after clamping with a collar in the extended position.
  • the unit with the tensioned strands can be placed as a whole construction on the formwork and aligned in this.
  • the lower strands then come to lie within the cross section of the later component. After concreting the component, these strands are embedded in concrete.
  • the clamping force of the lower strands passes over the component to be prestressed by bonding. This will pre-stress the component with the strands.
  • the entire clamping unit can be removed from the formwork and prepared for the next use.
  • Small mobile clamping units consist of a cast-out ⁇ 133mm steel pipe and the slightly larger units use two parallel laid steel pipes with a preferred ⁇ 133mg.
  • these mobile tensioning units Due to the parallel arrangement of strand bundles in the lower and upper layers, these mobile tensioning units have the advantage that the strand bundles can be deflected at almost random points by spreading. With spacers, the parallel strand bundles are moved at discrete points from its parallel axis, and thus deflected accordingly. This creates a deflected Spannlitzenverlauf, which is then implemented as such in the component.
  • the strands associated with the mobile tensioning bed are therefore also capable of taking up not only straight-line geometries.
  • a carrier be biased trapezoidal according to its course of torque, thus optimally exploiting the clamping reinforcement, and optimally bias the carrier.
  • the pressure pipe can be designed to the absolute minimum in the dimensions (only for the transmission of compressive stresses from the prestressed strands).
  • the cost of a mobile clamping unit with the cylinder is about 6,000.00 EUR. Compared to a possible tentering frame placed on the revolving table at a cost of about 100'000,00EUR, 30'000,00 EUR for five mobile units equivalent to the tenter frame are very economical. In addition, the mobile clamping units are characterized by the lower weight and greater flexibility in the application.
  • a circulation pallet 2 which consists essentially of rollers 3, on which a stiffening support 11 is arranged, which in turn carries a steel plate 12.
  • the steel plate 12 is the table on which the hardenable concrete mass is applied, and in the later drawings, it is always assumed that the Concrete mass is processed into a concrete element 5, which is penetrated by under tensile force reinforcing elements 10.
  • the reinforcing elements 10 may preferably be formed as steel strands, wires or rods.
  • the type of reinforcing elements can also be mixed. This means that different types of reinforcing elements (strands, wires and rods) can be used together or in combination with each other.
  • the reinforcing elements 10 are added to the left and right sides in associated abutment plates 7, 8, which are preferably formed as steel plates.
  • tensile elements loaded on tensile reinforcement elements 10 opposite tension elements 9 are arranged, which preferably correspond in size and number of the reinforcing elements 10.
  • the tension elements 10 can be arranged in the upper level (in the plane of the tension elements 9), or these tension elements can also consist of other materials.
  • the reinforcing elements 10 are formed of steel strands, the oppositely arranged tension elements 9 may consist of steel bars, wires or the like, or also of steel strands. The invention thus provides all possible embodiments, wherein it is important that over the upper tension elements 9, the same tensile forces are transmitted (in the sum), as about the lower reinforcing elements 10th
  • the tensile force is applied to the upper tension members and also to the lower reinforcement members 10 by a tensioning device 4, which in the preferred embodiment consists of a piston-and-cylinder arrangement.
  • a tensioning device 4 which in the preferred embodiment consists of a piston-and-cylinder arrangement.
  • FIG. 7 Further details of this piston-cylinder arrangement are for example FIG. 7 refer to.
  • the piston-cylinder arrangement between two pressure plates 16, 17 is arranged, for example, the piston 14 presses on the left pressure plate 16 on the abutment plate 8, while the cylinder housing 15 presses on an associated pressure plate 17 on the end face of the abutment profile 6.
  • the abutment profile 6 is preferably formed as a tubular profile. In order to transmit corresponding compressive forces, it is preferred if this tube profile is filled with a concrete or other load-transmitting mass.
  • the invention is not limited to the formation of a tube profile. It can be used all known profiles, such as. B. extruded or oval or rectangular or square profiles.
  • this abutment profile 6 is able to absorb the relatively high compressive forces and distribute between the abutment plates 7, 8.
  • tension elements 9 which are formed in the embodiment shown as steel strands
  • reinforcing elements 10 are opposite, which are also designed as steel strands and enforce the concrete element 5 under tensile force.
  • FIG. 5 shows a larger mobile fitted bed according to the invention, where it can be seen that a number of abutment profiles 6 can be used with associated clamping devices 4, wherein the abutment profiles 6a, 6b occupy a mutual distance and each in the space between the upper tension members 9 and the lower Reinforcing elements 10 are arranged.
  • FIG. 6 shows the same arrangement as FIG. 5 in the plan view, from which further details.
  • FIG. 7 shows the enlarged end view of the arrangement according to the Figures 3 and 4 , and this figure has already been described above. From this representation it can be seen that acts on the upper tension elements 9, a tensile force 18 which is exactly the same as the tensile force 19, which acts on the lower reinforcing elements 10.
  • the two tensile forces 18, 19 are compensated by the pressure force 20, which acts on the longitudinal cross section of the abutment profiles 6.
  • FIGS. 8 to 10 show as a further embodiment, that it is not necessary to guide the tension elements 9 and the reinforcing elements 10 in parallel under tensile force. There it is shown that between the elements 9, 10 spreading elements 13 are arranged, which are arranged perpendicular to the longitudinal extension of the elements 9, 10.
  • the reinforcing elements 10 can be adapted to the bending moment curve in the concrete element 5, which was previously not possible.
  • FIG. 10 shows as a further modification that it is possible, with the elimination of the tensioning device 4, an externally applied to the respective abutment plate 7, 8 pulling device which exerts a train in the direction of arrow 21 on both the tension elements 9 and the reinforcing elements 10.
  • FIGS. 8 to 10 With the embodiment of FIGS. 8 to 10 thus, another type of mobile clamping bed 22 is created, because with the illustrated elements 9, 10 and a curved course in the concrete element to be produced 5 is achieved.
  • FIG. 11 shows here that in each case a newly developed mobile clamping bed 1 is alternated with a polygonal clamping bed 22 and that a total of three straight trained clamping beds are arranged alternately with two polygonal clamping beds 22 together on the surface of a circulating pallet 2.
  • FIGS. 12 and 13 show only schematized in the side view of a mobile fitted bed 1 according to the embodiments described above Figure 1 to 4 and further the polygonal clamping bed 22 according to the embodiments according to FIGS. 8 to 10 ,

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing Of Tubular Articles Or Embedded Moulded Articles (AREA)

Claims (13)

  1. Banc de précontrainte pour la fabrication d'éléments préfabriqués en béton avec une armature précontrainte dans la section transversale desquels sont logés un certain nombre de torons d'armature, étant précisé que le banc de précontrainte (1) est disposé sur une table de coffrage et est conçu pour avoir une stabilité propre et être facilement transportable indépendamment de sa fixation sur la table de coffrage ou sur une palette de circulation (2), et se compose de deux plaques d'appui opposées (7, 8) entre lesquelles sont disposés un ou plusieurs profilés d'appui (6, 6a, 6b), et qu'il est prévu dans la partie inférieure de chaque plaque d'appui (7, 8) un ou plusieurs éléments d'armature (10) auxquels sont associés, à l'opposé, des éléments de traction respectifs (9) sur les plaques d'appui (7, 8) respectives, caractérisé en ce qu'il est prévu sur une extrémité libre avant d'un profilé d'appui (6, 6a, 6b) un dispositif de contrainte (4, 4a, 4b) qui appuie avec un côté sur le côté frontal du profilé d'appui (6, 6a, 6b), et avec l'autre côté frontal sur la plaque d'appui (7, 8).
  2. Banc de précontrainte selon la revendication 1, caractérisé en ce que les éléments d'armature (10) se composent, au choix, de torons ou de fils ou de barres ou d'une combinaison de ces éléments.
  3. Banc de précontrainte selon la revendication 1 ou 2, caractérisé en ce que les éléments de traction (9) se composent de torons ou de fils ou de barres ou d'une combinaison de ces éléments.
  4. Banc de précontrainte selon l'une au moins des revendications précédentes, caractérisé en ce que les plaques d'appui (7, 8) sont équilibrées en soi statiquement avec les profilés d'appui (6, 6a, 6b) prévus entre elles.
  5. Banc de précontrainte selon l'une au moins des revendications précédentes, caractérisé en ce qu'il est prévu, à l'opposé des éléments d'armature du bas (10), des éléments de traction supérieurs (9) qui sont reliés aux plaques d'appui (7, 8) et qui reçoivent la même traction que les éléments d'armature inférieurs (10), comparativement.
  6. Banc de précontrainte selon l'une au moins des revendications précédentes, caractérisé en ce que le dispositif de contrainte (4, 4a, 4b) est conçu comme un dispositif à piston et cylindre hydraulique.
  7. Banc de précontrainte selon l'une au moins des revendications précédentes, caractérisé en ce qu'un dispositif de traction agit de l'extérieur sur la plaque d'appui (7, 8) et tire sur la plaque d'appui pour l'éloigner du profilé d'appui (6, 6a, 6b).
  8. Banc de précontrainte selon l'une au moins des revendications précédentes, caractérisé en ce que sur la plaque d'appui (7, 8) correspondante, il est prévu, associé à l'opposé des éléments d'armature (10) qui sont disposés près de la table, sur le côté supérieur de la palette de circulation (2) et qui sont scellés dans l'élément préfabriqué en béton, un élément de traction (9) qui transmet les mêmes forces de traction que les éléments d'armature (10) qui sont scellés dans le béton (5).
  9. Banc de précontrainte selon l'une au moins des revendications précédentes, caractérisé en ce que les forces de traction sont transmises par l'intermédiaire des éléments de traction supérieurs (9) et des éléments d'armature inférieurs (10), et en ce que les forces de pression sont transmises par l'intermédiaire des profilés d'appui (6, 6a, 6b) situés entre les deux.
  10. Banc de précontrainte selon l'une au moins des revendications précédentes, caractérisé en ce que plusieurs bancs de précontrainte (1, 22) sont couchés côté à côte de manière modulaire sur une table de coffrage ou sur une palette de circulation (2).
  11. Banc de précontrainte selon l'une au moins des revendications précédentes, caractérisé en ce qu'il se compose des éléments constitutifs suivants :
    - deux plaques d'acier (12) comme appuis à l'extrémité correspondante de l'unité
    - un tube de pression entre les deux plaques d'acier (12)
    - un vérin hydraulique (14, 15) dans l'axe du tube de pression, fixé à l'une des plaques d'acier.
  12. Banc de précontrainte selon la revendication 11, caractérisé en ce que les plaques d'acier (12) forment la travée d'appui pour recevoir les torons avec leurs ancrages, et en ce qu'elles renferment les ouvertures pour le montage, dans la bonne position, des fourreaux d'ancrage permanents et temporaires, étant précisé que les plaques d'acier (12) sont dressées sur le fond de coffrage et définissent ainsi la position en hauteur des torons à précontraindre.
  13. Banc de précontrainte selon la revendication 12, caractérisé en ce qu'il est prévu entre les éléments de traction et d'armature (9, 10) des éléments d'écartement (13) qui sont disposés perpendiculairement à l'extension longitudinale des éléments de traction et d'armature (9, 10) .
EP20100003732 2009-04-07 2010-04-07 Banc de précontrainte mobile pour éléments en béton précontraint Active EP2239119B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200910016692 DE102009016692A1 (de) 2009-04-07 2009-04-07 Mobiles Spannbett für Beton-Fertigteilelemente mit vorgespannter Bewehrung

Publications (3)

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EP2239119A2 EP2239119A2 (fr) 2010-10-13
EP2239119A3 EP2239119A3 (fr) 2012-10-03
EP2239119B1 true EP2239119B1 (fr) 2014-01-01

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Families Citing this family (6)

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Publication number Priority date Publication date Assignee Title
CN105034162A (zh) * 2015-03-31 2015-11-11 江苏华江祥瑞现代建筑发展有限公司 单模台非预张整体张拉装置及其工作方法
CN104942989A (zh) * 2015-07-03 2015-09-30 四川睿铁科技有限责任公司 一种适合于高寒地区高速铁路大轨距轨道板的制作工艺
CN105479598B (zh) * 2015-11-20 2018-01-23 长春工业大学 一种轨枕预应力筋自动张拉装置
CN205870848U (zh) * 2016-07-19 2017-01-11 中国铁道科学研究院铁道建筑研究所 一种单根同组自动张拉锁紧装置
CN109968520A (zh) * 2019-01-17 2019-07-05 海门市帕源道路工程材料有限公司 一种预制板梁的制作方法
CN112411378A (zh) * 2019-08-20 2021-02-26 河北高达智能装备股份有限公司 一种桥梁预应力整束钢绞线压紧输送装置

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3666385A (en) * 1969-07-03 1972-05-30 Robert S Baker Apparatus for making prestressed concrete members
DE2734757A1 (de) * 1976-08-09 1978-02-16 Alexandre Dipl Ing Birguer Verfahren zur herstellung eines biegetraegers aus spannbeton im spannbett und vorrichtung zur durchfuehrung dieses verfahrens
JP3610283B2 (ja) * 2000-04-27 2005-01-12 株式会社日本ピーエス 移動式プレテンション装置

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Publication number Publication date
DE102009016692A1 (de) 2010-10-14
EP2239119A2 (fr) 2010-10-13
EP2239119A3 (fr) 2012-10-03

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