EP0349244A2 - Schalungselemente - Google Patents

Schalungselemente Download PDF

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Publication number
EP0349244A2
EP0349244A2 EP89306470A EP89306470A EP0349244A2 EP 0349244 A2 EP0349244 A2 EP 0349244A2 EP 89306470 A EP89306470 A EP 89306470A EP 89306470 A EP89306470 A EP 89306470A EP 0349244 A2 EP0349244 A2 EP 0349244A2
Authority
EP
European Patent Office
Prior art keywords
flange portion
boss
water stop
tie bar
water
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Withdrawn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
EP89306470A
Other languages
English (en)
French (fr)
Other versions
EP0349244A3 (de
Inventor
Roy Derek Brownley
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.)
RMD Kwikform Ltd
Original Assignee
GKN Kwikform Ltd
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 GKN Kwikform Ltd filed Critical GKN Kwikform Ltd
Publication of EP0349244A2 publication Critical patent/EP0349244A2/de
Publication of EP0349244A3 publication Critical patent/EP0349244A3/de
Withdrawn legal-status Critical Current

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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
    • 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

Definitions

  • This invention relates to formwork as used in the construction industry for the casting of concrete walls or the like wherein liquid concrete is poured into a cavity between formwork shuttering, the concrete is allowed to set and the shuttering is then removed.
  • Tie bars may be either threaded throughout their length or may only have threaded ends, the portion intermediate such threaded ends being unthreaded and straight apart from a central "kink" which is sometimes provided to locate a water stop.
  • each threaded end of a tie bar may be connected to a conical shell connector within the cavity and a further tie bar may then be connected to each such shell to extend through the shuttering for clamping connection to an associated strongback.
  • the length of tie bar within the cavity is usually less than the width of the cavity (by the combined lengths of the conical shells) and, after the concrete has set and the shuttering has been removed, this length of tie bar is retained within the concrete.
  • the conical shells are removed and the conical recesses are filled with grout or like filler material plugs.
  • a further arrangement has proposed the use of an annular elastomeric disc with an integral boss with a smooth central bore which can be slid onto a threaded or unthreaded tie bar from either end thereof and then clamped thereon by a metal clamping ring around the boss.
  • Such an arrangement enables the water stop to seal to the tie bar and resist the water pressures to which it may be exposed but suffers from the disadvantage that the metal clamping ring itself may be exposed to moisture and hence eventually corrode within the concrete mass.
  • a water stop mountable on a threaded tie bar for use in concrete formwork comprising an elastomeric flange portion and an elastomeric boss secured to said flange portion, the maximum exterior dimension of the boss being less than the maximum exterior dimension of the flange portion, the flange portion and the boss having an internally threaded bore extending therethrough of a thread form cooperable with that of the tie bar; the flange portion and the boss being so configured and arranged relative to one another that the stop may be either slid onto or screwed onto the tie bar in the direction of thread advancement but will not slide axially of the tie bar under the action of water pressure induced axial forces acting on that face of the flange portion remote from the boss in a direction opposite to the direction of thread advancement.
  • an assembly of water stop and threaded tie bar for use in concrete formwork wherein the water stop comprises an elastomeric flange portion and an elastomeric boss secured to said flange portion, the maximum exterior dimension of the boss being less than the maximum exterior dimension of the flange portion, the flange portion and the boss having an internally threaded bore extending therethrough in cooperating engagement with the threads of the tie bar intermediate its ends; the flange portion and the boss of the water stop being so configured and arranged relative to one another that the stop may be initially either slid onto or screwed onto the tie bar in the direction of thread advancement but will not slide axially of the tie bar under the action of water pressure induced axial forces acting on that face of the flange portion remote from the boss in a direction opposite to the direction of thread advancement.
  • Said flange portion and said boss of the water stop are preferably formed integral with one another as a moulding, conveniently an injection moulding, of ethylene propylene or other suitable elastomeric material capable of withstanding the water pressures to which it may be exposed within its operational temperature range without deterioration.
  • the water stop is preferably capable of resisting said water pressure induced forces up to a pressure of at least two bar and preferably up to a pressure of four bar.
  • the flange portion and the boss are each of annular configuration.
  • the water stop 10 comprises a moulding, conveniently an injection moulding, of an elastomeric material such as ethylene propylene in the form of a circular cross section flange portion 14 of an annular form and an integral circular cross section boss 16 also of annular form through which extends an internally threaded central bore 18; the thread form of the bore 18 cooperating with the thread form of the threaded tie bar 12.
  • the overall diameter of the flange portion 14 of the water stop is considerably greater than the overall diameter of the boss 16.
  • Both the flange portion 14 and the boss 16 have respective planar end faces 20, 22, 24; the planar end face 20 of the flange portion remote from the boss being the water pressure resistant face and the planar end face 22 of the flange portion adjacent the boss merging with the outer surface of the boss at a radius.
  • the water stop should be capable of resisting water pressures up to a pressure of at least two bar and preferably up to four bar within an operational temperature range of minus 40 degrees C to 120 degrees C.
  • the water stop 10 may be either slid onto or screwed onto the threaded tie bar 12 in the direction of thread advancement to a position intermediate its ends as shown in Figure 3.
  • a tie bar may be 1000mms or more in length, to slide the water stop onto the tie bar in the direction of thread advancement i.e. in a direction from right to left as shown in Figures 2 and 3 with the planar face 20 leading and the boss trailing.
  • pressure applied to the planar end face 20 of the flange portion 14 of the water stop causes compression and radially inward contraction of the boss 16 sealing and locking the water stop to the tie bar against pressure induced axial forces acting in a direction opposite to the direction of thread advancement i.e. in the direction from left to right as shown by the arrows P in Figures 2, 3 and 5.
  • Figure 3 shows the assembly of water stop 10 and threaded tie bar 12 retained in position in a mass of cast concrete 26 after the concrete has set and after the conventional conical shell connectors have been removed from the ends of the tie bar and the resulting recesses filled with grout or other suitable filler material plugs 28.

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)
EP89306470A 1988-06-29 1989-06-26 Schalungselemente Withdrawn EP0349244A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8815438 1988-06-29
GB8815438A GB2220222B (en) 1988-06-29 1988-06-29 Improvements in formwork elements

Publications (2)

Publication Number Publication Date
EP0349244A2 true EP0349244A2 (de) 1990-01-03
EP0349244A3 EP0349244A3 (de) 1990-03-07

Family

ID=10639554

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89306470A Withdrawn EP0349244A3 (de) 1988-06-29 1989-06-26 Schalungselemente

Country Status (2)

Country Link
EP (1) EP0349244A3 (de)
GB (1) GB2220222B (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6317283B2 (ja) * 2015-03-24 2018-04-25 ＢｉＣ株式会社 防錆・防水を兼ねさらに一体化セットされたコンクリート型枠保持締付け部材

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2710184A1 (de) * 1977-03-09 1978-09-14 Walter Hoff Vorrichtung fuer einsatzkoerper im betonbau
DE2853349A1 (de) * 1978-12-11 1980-06-12 Walter Hoff Sperrvorrichtung
DE8506747U1 (de) * 1985-03-08 1986-07-03 Hünnebeck GmbH, 4030 Ratingen Ankermutter für Schalungsanker

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2710184A1 (de) * 1977-03-09 1978-09-14 Walter Hoff Vorrichtung fuer einsatzkoerper im betonbau
DE2853349A1 (de) * 1978-12-11 1980-06-12 Walter Hoff Sperrvorrichtung
DE8506747U1 (de) * 1985-03-08 1986-07-03 Hünnebeck GmbH, 4030 Ratingen Ankermutter für Schalungsanker

Also Published As

Publication number Publication date
GB8815438D0 (en) 1988-08-03
GB2220222B (en) 1992-01-02
EP0349244A3 (de) 1990-03-07
GB2220222A (en) 1990-01-04

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