WO2007072528A1 - Tirant en plastique destine a un coffrage de construction - Google Patents

Tirant en plastique destine a un coffrage de construction Download PDF

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Publication number
WO2007072528A1
WO2007072528A1 PCT/IT2006/000771 IT2006000771W WO2007072528A1 WO 2007072528 A1 WO2007072528 A1 WO 2007072528A1 IT 2006000771 W IT2006000771 W IT 2006000771W WO 2007072528 A1 WO2007072528 A1 WO 2007072528A1
Authority
WO
WIPO (PCT)
Prior art keywords
tie
rod
fact
formwork
plastic
Prior art date
Application number
PCT/IT2006/000771
Other languages
English (en)
Inventor
Ezio Sedran
Original Assignee
Ezio Sedran
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 Ezio Sedran filed Critical Ezio Sedran
Publication of WO2007072528A1 publication Critical patent/WO2007072528A1/fr

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G17/00—Connecting or other auxiliary members for forms, falsework structures, or shutterings
    • E04G17/06—Tying means; Spacers ; Devices for extracting or inserting wall ties
    • E04G17/065—Tying means, the tensional elements of which are threaded to enable their fastening or tensioning
    • E04G17/0651—One-piece elements
    • E04G17/0652—One-piece elements fully recoverable

Definitions

  • the present patent relates to equipment for building constructions and in particular concerns tie-rods, which are used in construction formwork, with which structures in reinforced concrete are built.
  • the most advanced formwork consists of panels with a metal frame (steel, aluminium etc.) which contain a multi-ply timber panel, and/or of one-piece panels in plastic.
  • tie-rods are used, consisting of threaded bars, onto the ends of which are screwed accessories, which lock the formwork in the desired position. This avoids it being displaced and/or deformed as a result of the pressure which is created when it is filled with concrete.
  • tie-rods are in metal and consist of a threaded bar, predominantly of the "diwidag bar” type.
  • the accessories which are screwed onto them are also made of metal, and have various conformations. The most widely-used of these is called a “nut plate” or “flanged nut”.
  • the current tie-rods represent an excellent and tested means of opposing the pressure of the concrete, but have the defects of weighing a lot, of being expensive and of requiring more work than necessary, because an accessory needs to be screwed on and unscrewed at both extremities.
  • tie-rod has been conceived and researched, which presents two important novelties: the first is that at, one extremity, it incorporates integrally one of the accessories which lock the formwork; the second is that, preferably, it can be made of plastic (synthetic resin and/or polymers), by the technique of moulding, a technique which is very widely used to produce a very large number of objects, but never utilised for the production of tie-rods.
  • This technique provides for the use of a machine, called a press, and of a mould constructed in steel and/or other metal.
  • the press receives the raw material (synthetic resin and/or polymers), in the solid state, meters it, melts it till it is brought to a liquid state and injects it at high pressure (approx. 2 kg per cm 2 ) into the mould, implementing precisely the parameters (temperature of the plastic, temperature of the mould, sequence of opening the nozzles, injection pressure, cooling time for the mould etc.) which have previously been set and memorised (as a result of careful research and many practical tests) on an electronic board, floppy disk or other media.
  • high pressure approximately 2 kg per cm 2
  • the press can meter and inject other materials capable of correcting possible defects (physical and/or chemical expanders and/or nucleating agents called internationally Foaming Agents, Blowing Agents and Nucleating Agents), or materials capable of adding characteristic benefits to the plastic (protection from ultraviolet rays for example) or, again, capable of adding useful characteristics (for example, colourants).
  • materials capable of correcting possible defects (physical and/or chemical expanders and/or nucleating agents called internationally Foaming Agents, Blowing Agents and Nucleating Agents), or materials capable of adding characteristic benefits to the plastic (protection from ultraviolet rays for example) or, again, capable of adding useful characteristics (for example, colourants).
  • the fibres and the mineral additives serve to increase the strength of the plastic, for example its resistance to traction
  • the expanders serve to ensure that the plastic which forms the tie-rod does not deform in the cooling and solidification phase, and to ensure homogeneous shrinkage, or even, if useful and/or advantageous, to further reduce the weight.
  • the protective agents against ultraviolet rays improve the characteristics of the plastic, which has the defect of being attacked by them. It should be borne in mind that tie-rods are used on building sites, therefore in the open air. Consequently they are exposed to the rays of the sun and therefore to ultraviolet rays. If they were not enriched with this substance, in the short space of a few years they would be attacked and begin to degrade through the phenomenon of "chalking". The tie-rods would thus lose one of their principal characteristics, which consists in their durability.
  • the colourants perform a function of great usefulness. In fact, for a cost which consists only of their purchase price, without there being any additional cost for subsequent processes (as occurs
  • V for example with painting and zinc-plating metal
  • they allow the operator to easily and intuitively identify the class to which the tie- rods belong, in terms of its capacity.
  • the tie-rod with a capacity of 4.0 tons can be coloured red, the one with a capacity of
  • 6.5 tons can be coloured green, and so on.
  • This innovative tie-rod is distinguished from those currently in use, principally by the following characteristics: - universality, that is to say that it can be used, throughout the world, in any kind of formwork for building;
  • the new tie-rod since much time is saved by the fact that it is no longer necessary to screw and unscrew an accessory at one extremity, because the new tie-rod contains it incorporated integrally. Furthermore, being very light, the new tie-rod does not fatigue the workers who handle it, and allows them to maintain constant productivity over the course of the day.
  • An object of the present invention is to produce a tie-rod for construction formwork in plastic, which incorporates, at one extremity, the accessory for locking the formwork, in order to simplify and speed up the operations of setting up the formwork and dismantling it.
  • tie-rod should be light and that it should not fatigue the workers who use it.
  • Another object is that it should be inexpensive and that it should be usable throughout the world and with every type of formwork. Another object is that it should be made from recyclable materials and/or that it should be able to be made from recycled materials. Another object is that it should promote safety on building sites, in other word that it should be easily identifiable, with different colour-schemes depending on the capacity, without the possibility of error.
  • FIG. 1 shows one of the many types of tie-rod (Ta) currently in use in construction formwork and how it is made up of a threaded bar (Bd) onto which are screwed, at one extremity, the nut plate (Pd) and, at the other extremity, the nut with three wings (Da) which divides the force reacting to the pressure of the concrete on the plate (Pr).
  • Figure 2 shows, by way of example but without limiting effect, the new tie- rod in plastic (NT), and it can clearly be seen how the accessory for locking the formwork (DFI) is incorporated integrally into the threaded bar (BF), while the other accessory for locking the formwork (DF), which is screwed onto the threaded bar (BF) by means of the threaded hole (FF), is separate.
  • DFI accessory for locking the formwork
  • DF the formwork
  • FF threaded hole

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Forms Removed On Construction Sites Or Auxiliary Members Thereof (AREA)

Abstract

La présente invention concerne l’équipement destiné à la construction de bâtiments, plus particulièrement des tirants utilisés dans le coffrage de construction qui servent à bâtir des structures en béton armé.
PCT/IT2006/000771 2005-12-19 2006-11-06 Tirant en plastique destine a un coffrage de construction WO2007072528A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITPN2005A000093 2005-12-19
ITPN20050093 ITPN20050093A1 (it) 2005-12-19 2005-12-19 Tirante di plastica per casseforme edili.

Publications (1)

Publication Number Publication Date
WO2007072528A1 true WO2007072528A1 (fr) 2007-06-28

Family

ID=37814352

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IT2006/000771 WO2007072528A1 (fr) 2005-12-19 2006-11-06 Tirant en plastique destine a un coffrage de construction

Country Status (2)

Country Link
IT (1) ITPN20050093A1 (fr)
WO (1) WO2007072528A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101769073B (zh) * 2010-01-28 2012-02-08 中建三局建设工程股份有限公司 玻璃纤维对拉杆模板加固***及使用方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2033715A1 (de) * 1969-12-19 1971-02-18 Bourgeat Eugene, Saint Etienne, Loire (Frankreich) Verfahren und Mittel zum Instellung bringen von im Ganzen aus Gips oder einem gegossenen Material gefertigten Trenn wanden
FR2265944A1 (fr) * 1974-03-28 1975-10-24 Liedgens Karl
DE19522751A1 (de) * 1995-06-22 1997-01-02 Kunz Gmbh & Co Verbindungseinrichtung für Schalungsplatten und/oder Bewehrungen einer Schalung

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2033715A1 (de) * 1969-12-19 1971-02-18 Bourgeat Eugene, Saint Etienne, Loire (Frankreich) Verfahren und Mittel zum Instellung bringen von im Ganzen aus Gips oder einem gegossenen Material gefertigten Trenn wanden
FR2265944A1 (fr) * 1974-03-28 1975-10-24 Liedgens Karl
DE19522751A1 (de) * 1995-06-22 1997-01-02 Kunz Gmbh & Co Verbindungseinrichtung für Schalungsplatten und/oder Bewehrungen einer Schalung

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101769073B (zh) * 2010-01-28 2012-02-08 中建三局建设工程股份有限公司 玻璃纤维对拉杆模板加固***及使用方法

Also Published As

Publication number Publication date
ITPN20050093A1 (it) 2007-06-20

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