(19)
(11) EP 0 349 244 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
07.03.1990 Bulletin 1990/10

(43) Date of publication A2:
03.01.1990 Bulletin 1990/01

(21) Application number: 89306470.9

(22) Date of filing: 26.06.1989
(51) International Patent Classification (IPC)5: E04G 17/065, E04G 17/06
(84) Designated Contracting States:
AT BE CH DE ES FR GB GR IT LI LU NL SE

(30) Priority: 29.06.1988 GB 8815438

(71) Applicant: GKN Kwikform Limited
GB-Ealing, London W5 5SE (GB)

(72) Inventor:
  • Brownley, Roy Derek
    Walsall West Midlands, WS5 8HG (GB)

(74) Representative: Thorpe, Brian et al
Guest Keen and Nettlefolds plc Group Patents and Licensing Department P.O. Box 55 Ipsley House Ipsley Church Lane
Redditch Worcestershire B98 0TL
Redditch Worcestershire B98 0TL (GB)


(56) References cited: : 
   
       


    (54) Improvements in formwork elements


    (57) An assembly of water stop (10) and threaded tie bar (12) for use in the casting of concrete to provide concrete walls subject to water pressure is provided wherein the water stop (10) comprises a moulded elastomeric annular flange portion (14) of greater overall diameter than an integral boss (16). The water stop (10) may be initially slid onto the tie bar (12) 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 (20) of the flange portion (14) in a direction opposite to the direction of thread advancement. Water pressure induced axial forces acting on the face (20) cause compression and radially inward contraction of the boss (16) sealing and locking the water stop to the tie bar thereby preventing water penetration past the water stop.







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