Shear-Reinforced Anchor System with Anti-Loosening by Double Spiral Bolt

Defects in Ordinary Anchor Sockets

• - Due to breakoff of an anchor socket bolt, bridge bearing is pushed away.
• - It is a stable structure of which lower anchor socket is inserted into lower plate.
• - When bridge bearing is replaced, if anchor socket is inserted, lifting height is limited.
• - Bolt loosening and fatigue failure by repture, due to frequent live load induced vibration.
• 

Structure of Anchor Socket

• 

Special Features

• - Internal socket enables partial maintenance and higher shear resistance.
• - Geometrical double spiral structure prevents bolt loosening.
• - Prevention of bolt loosening allows no fatigue failure by rupture caused by live load.
• 

Anchor Socket Internal Structure

• - Geometrical phase difference of Double Spiral prevents bolt loosening.
• - DDR's anchor socket can be disassembled only after disassembling supplementary bolt.
• - Internal socket enables partial maintenance and higher shear resistance.
•