TurnaSure Bolting Technology for Bridge Construction

Leavenworth Bridge, KS

The first structure to use Direct Tension Indicators (DTIs) was a bridge constructed in 1962. Since then, major bridges around the world have incorporated DTIs for the many benefits they provide. In the UK most major bridges utilized DTIs in their construction by the 1970s. These included the Britannia Bridge in Anglesey Wales, the Balahulish Bridge, near Fort William in Scotland and the Queen Elizabeth Bridge on the M25 in London. The majority of U.S. states now require DTIs on all bridge construction. States usually strictly require DTI's to ASTM F959.

Regarding squirt-type washers, ASTM F959 has no explicit provision or allowances for channels on the underside, or for inclusion of silicone in pockets, whose appearance would indicate the min/max compression loads. TurnaSure believes that reference to squirt-type washers meeting ASTM F959 can give users the impression that the ASTM has recognized squirt- type washers. This is not correct.