EP2685028A2 - Procédé de production de tige d'attache de coffrage et ladite tige - Google Patents

Procédé de production de tige d'attache de coffrage et ladite tige Download PDF

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Publication number
EP2685028A2
EP2685028A2 EP13003439.0A EP13003439A EP2685028A2 EP 2685028 A2 EP2685028 A2 EP 2685028A2 EP 13003439 A EP13003439 A EP 13003439A EP 2685028 A2 EP2685028 A2 EP 2685028A2
Authority
EP
European Patent Office
Prior art keywords
sheath
conical
ending
sleeves
core
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.)
Withdrawn
Application number
EP13003439.0A
Other languages
German (de)
English (en)
Other versions
EP2685028A3 (fr
Inventor
Stanislaw Pargiela
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP2685028A2 publication Critical patent/EP2685028A2/fr
Publication of EP2685028A3 publication Critical patent/EP2685028A3/fr
Withdrawn legal-status Critical Current

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    • 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
    • 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
    • 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
    • E04G17/07—Tying means, the tensional elements of which are fastened or tensioned by means of wedge-shaped members
    • E04G17/0707—One-piece elements
    • E04G17/0714—One-piece elements fully recoverable
    • 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
    • E04G17/075—Tying means, the tensional elements of which are fastened or tensioned by other means
    • E04G17/0751—One-piece elements
    • E04G17/0752—One-piece elements fully recoverable

Definitions

  • Object of the invention is a method for production of a formwork tie rod and the formwork tie rod, which constitutes an element for stabilizing modular formwork kits designed e.g. for shuttering of side walls of buildings, containers, or foundations, or retaining walls for highway engineering, and also for shuttering of any other building structures.
  • Formwork boards especially made of steel, are usually arranged together in pairs and stabilized by means of tie rods connecting them to secure upholding a fixed position of formwork boards while pouring concrete into the space formed between the boards.
  • tie rods are steel threaded rods obtained by hot rolling or cold rolling.
  • the rods can be equipped with a full form thread or a bi-flattened (self-cleaning) thread.
  • Formwork boards are connected in such a way that a length of tie rods is greater than a distance fixed between the boards upon their positioning.
  • Flange nuts of various types are screwed onto protruding end-parts of the tie rods to pull tight the boards. Between the boards, strutting elements can be placed.
  • the formwork boards are disassembled by removing nuts from the end-parts of the tie rods. It is impossible to recover such tie rods, as they remain within the cast concrete - they are so called "lost rods".
  • Such a concept is utilized in more complex mechanisms of various types stabilizing formwork modules as it is for example described in Polish Patent PL175167B1 , where a formwork system constituting a tight culvert through a wall, including a threaded tie rod is disclosed, and in PL202347B1 , where a formwork including a rod which is only partly threaded for stabilizing a support of a formwork board.
  • Another known method of recovery of formwork tie rods is to give them a structure enabling its later "knocking-out" of the concrete construction.
  • a middle part of the tie rod located between the formwork boards and to be filled with concrete, is smooth and non-threaded.
  • the non-threaded part of the tie rod has additionally a conical shape to facilitate its knocking-out of the hardened concrete.
  • the non-threaded part of the rod is covered with chemical agents to avoid concrete adhering.
  • Such rods are produced from a homogeneous cylinder-shaped cross-section of material, which is subject to machining; on subsequent sections of the rod a thread is formed and a smooth conical shape is given. It is often impossible to subject such rods to fusion welding or welding, their production is time consuming, they are made of more expensive materials, and furthermore, as a result of processing they can include necked-down fragments of poor durability.
  • Aim of the invention is to develop of a formwork tie rod of high durability recoverable upon being used, enabling simple and inexpensive production and including a non-threaded middle part.
  • Object of the invention is a method for production of a formwork tie rod, characterized in that a longitudinal conical sheath having a circular cross-section, made of a readily workable material selected from a group consisting of metals, metal alloys and plastics, is permanently and concentrically mounted on a middle portion of a homogeneous core in a form of a threaded rod, whereas
  • the inclination angle of the conical external surface of the sheath to the axle of the rod amounts from 0.1° to 3°, preferably from 0.1° to 1°.
  • the formwork tie rod of the present invention is composed of a homogeneous core having a form of a threaded rod, on which, in its middle portion, a longitudinal conical sheath having a circular cross-section is permanently and concentrically fixed, and either the sheath is entirely made of workable metals or metal alloys or of plastic, or the sheath is not homogeneous and composed of two conical ending sleeves - made of metal or metal alloy - the more narrow one and the more wide one, between which there is the middle part of the sheath made of plastic.
  • the inclination angle of the conical external surface of the sheath to the axle of the rod amounts from 0.1° to 3°, preferably from 0.1° to 1°.
  • Fig. 1 shows a general lateral view of the tie rod having the non-threaded middle conical part
  • Fig. 2 shows in a longitudinal section and a cross-section
  • Fig. 3 shows in a longitudinal section and a cross-section the second step of production of the tie rod of Fig. 1
  • Fig.4 shows a longitudinal section of the finished rod of Fig. 1
  • Fig. 5 shows the second embodiment, in which the conical part is composed of the middle part made of plastic and of two metal ending parts
  • Fig.6 shows a scheme of example mechanism stabilizing formwork boards, the mechanism including the formwork tie rod of the invention.
  • the tie rod in the embodiment is composed of a homogeneous threaded core 1, on the middle portion of which, a longitudinal conical sheath 2 is permanently and concentrically fixed around the core, having a greater cross-section diameter than the core diameter.
  • the threaded core 1 has equal diameter along its whole length, whereas the middle, non-threaded conical portion having a form of the sheath 2 has a variable diameter - increasing towards one of non-shielded rod ending parts.
  • the conical portion of the rod along its whole length has retained the equal angle between its external surface and the longitudinal axle of the core.
  • the conical sheath 2 can be in its first embodiment of the invention made of workable homogeneous material, e.g.
  • all the three said elements of the conical part of the tie rod (of the sheath) have a mutually adjusted conical shape, such that it forms a smooth uniform surface and the surface of the entire middle part of the rod has the same inclination angle to the longitudinal axle of the rod so the external dimensions and the whole surface of the sheath 2 in both embodiments of the invention are the same.
  • An inclination angle of the conical external surface of the sheath to the axle of the rod amounts from 0.1° to 3°, preferably from 0.1° to 1°.
  • the tie rod of the invention is manufactured in such a way that as a raw material - core, a homogeneous metal threaded rod obtained by rolling is used, and onto the rod - an additional layer of steel or plastic or - in the second embodiment - a layer of a combination of steel and plastic, is permanently fixed (mounted).
  • the internal core can be a typical tie rod of a known type equipped with a full thread or with a flattened thread. Placing an additional conical middle portion of the rod (i.e. the sheath) on the core is in the first embodiment of the invention carried out by means of pressing a cylindrical sleeve on the threaded core, and then that part is subject to mechanical processing to form a conical external surface.
  • the sleeve (and next the sheath) should be made of readily workable metal alloys used in building industry. As schematically shown on Fig. 2 and Fig. 3 , the metal sleeve is placed on the core and pressed (side drawing on Fig. 3 ) on the core, thus joining it permanently with the threaded core, and next the conical shape is formed during the further mechanical processing.
  • the sheath can also be entirely made of plastic and in such a case, the sheath is formed on the core by means of e.g. injection moulding with a use of known methods of plastics processing.
  • plastics based on e.g. polyethylene and polypropylene, and monomers of higher molecular weight (homopolymers and copolymers of PP, PS and its copolymers, PVC, PA and other).
  • the sheath is composed of two metal ending sleeves opposing each other, between which there is a part made of plastic.
  • the metal sleeves are made separately in advance, using known methods and their external surfaces are shaped to obtain a conical shape exhibiting an inclination angle consistent with an angle to be obtained for the whole sheath.
  • the rod of the invention can be made on the basis on the same threaded core, but the conical part of the rod is made by means of integrating the plastic layer with the core, the ends of the conical part constituting conical ending sleeves 2C (the more narrow one) and 2D (the more wide one) made of metals and alloys, and the middle part made of plastic being placed between them.
  • the ending sleeves 2C and 2D can be threaded inside, screwed on the core from both sides and positioned in a suitable position, to form a space between them which has to be filled with plastic by means of injection moulding.
  • a uniform conical part having a constant inclination angle of the conical surface to the rod axle is obtained.
  • the tie rod such that the ending sleeves 2C and 2D are not threaded inside, but they are suitably placed in an injection mould on the core to constitute end elements of the conical part and the free space between them is filled with plastic to form a uniform conical part. Injection of the plastic provides at the same time the permanent fixing (sealing and integrating) of the ending sleeves 2C and 2D to the internal core.
  • the tie rod of the invention constitutes an element of an illustrative mechanism stabilizing formwork construction as shown on Fig. 6 .
  • the tie rods stabilize formwork boards A equipped with assembly holes sealed with pieces D of the greater hole diameter and D' of the smaller hole diameter, and within these holes tie rods are placed, onto which, outside of boards A distance elements B are put.
  • Disassembling the mechanism stabilizing formwork is carried out in the reverse sequence - nuts are removed, after that - distance elements, and the tie rod is knocked out of that side where the conical part is more narrow, to enable its pulling-out from the more wide side.

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Forms Removed On Construction Sites Or Auxiliary Members Thereof (AREA)
  • Moulds, Cores, Or Mandrels (AREA)
EP13003439.0A 2012-07-09 2013-07-07 Procédé de production de tige d'attache de coffrage et ladite tige Withdrawn EP2685028A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PL399878A PL399878A1 (pl) 2012-07-09 2012-07-09 Sposób wytwarzania szalunkowego preta sciagowego i szalunkowy pret sciagowy

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
PL39987812 Previously-Filed-Application 2012-07-09

Publications (2)

Publication Number Publication Date
EP2685028A2 true EP2685028A2 (fr) 2014-01-15
EP2685028A3 EP2685028A3 (fr) 2014-12-10

Family

ID=49118263

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13003439.0A Withdrawn EP2685028A3 (fr) 2012-07-09 2013-07-07 Procédé de production de tige d'attache de coffrage et ladite tige

Country Status (2)

Country Link
EP (1) EP2685028A3 (fr)
PL (1) PL399878A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104863353A (zh) * 2015-06-09 2015-08-26 广东建星建筑工程有限公司 建筑模板系统
CN110485726A (zh) * 2019-08-21 2019-11-22 山东方圆建筑材料有限公司 建筑模板拉杆组合
CN112196264A (zh) * 2020-09-30 2021-01-08 筑友智造科技投资有限公司 一种模板加固装置
EP4004306A1 (fr) * 2019-07-31 2022-06-01 MEVA Schalungs-Systeme GmbH Tirant de coffrage

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
PL175167B1 (pl) 1994-11-02 1998-11-30 Krzysztof Postawa Przepust szczelny przez ścianę i sposób wykonywania przepustu szczelnego
PL202347B1 (pl) 2001-09-26 2009-06-30 Przedsi & Eogon Biorstwo Reali Szalunek

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4159097A (en) * 1976-09-13 1979-06-26 Strickland Systems Inc. Tie having integrally molded sleeve
DE102007031107A1 (de) * 2007-07-04 2009-01-08 Stahlwerk Annahütte Max Aicher GmbH & Co. KG Ankerstab für eine Schalung
DE102010015582A1 (de) * 2010-04-19 2011-10-20 Dywidag-Systems International Gmbh Konus zur Herstellung einer Ankerstelle an einem Betonbauteil

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
PL175167B1 (pl) 1994-11-02 1998-11-30 Krzysztof Postawa Przepust szczelny przez ścianę i sposób wykonywania przepustu szczelnego
PL202347B1 (pl) 2001-09-26 2009-06-30 Przedsi & Eogon Biorstwo Reali Szalunek

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104863353A (zh) * 2015-06-09 2015-08-26 广东建星建筑工程有限公司 建筑模板系统
EP4004306A1 (fr) * 2019-07-31 2022-06-01 MEVA Schalungs-Systeme GmbH Tirant de coffrage
CN110485726A (zh) * 2019-08-21 2019-11-22 山东方圆建筑材料有限公司 建筑模板拉杆组合
CN112196264A (zh) * 2020-09-30 2021-01-08 筑友智造科技投资有限公司 一种模板加固装置

Also Published As

Publication number Publication date
PL399878A1 (pl) 2014-01-20
EP2685028A3 (fr) 2014-12-10

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