(19)
(11) EP 0 386 368 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
26.06.1991 Bulletin 1991/26

(43) Date of publication A2:
12.09.1990 Bulletin 1990/37

(21) Application number: 89311627.7

(22) Date of filing: 09.11.1989
(51) International Patent Classification (IPC)5: E21D 11/08
(84) Designated Contracting States:
BE GB

(30) Priority: 07.03.1989 GB 8905225

(71) Applicant: CHARCON TUNNELS LIMITED
London SW1 7UE (GB)

(72) Inventor:
  • Mitchell, Samuel Bailey Hart
    Wraysbury Nr. Staines Middlesex (GB)

(74) Representative: Bayliss, Geoffrey Cyril et al
BOULT, WADE & TENNANT 27 Furnival Street
London EC4A 1PQ
London EC4A 1PQ (GB)


(56) References cited: : 
   
       


    (54) Improvements in or relating to joining concrete elements


    (57) The disclosure relates to a concrete element (10) having a corner (14) between a side face (12) and an end face (11) in which a box shaped cavity (15) is formed. A pair of U-shaped loops (18) is cast in the segment at the corner with base members (19) of the loops extending parallel to one another across the cavity to receive a fixing bolt (12) which has a head (21) and washer brackets (22) engaging behind the loops and a shank extending from the end of the element to engage in a nut similarly held in a recess of a corresponding segment for securing the segment ends together.
    The arrangement permits the bolt to be tightened through the cavities at the sides of the segments.
    The arrangement is particularly suitable for securing arcuate concrete tunnel lining segments together.







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