Railway electrification specialists Ineo SCLE Ferroviaire (an entity of ENGIE Solutions) were contracted to overhaul the catenary system on the tramway. They needed a solution for connecting cantilevered support arms to the vertical steel masts that line the tramway route. The solution had to be easy to install which meant drilling should be avoided due to challenges in the field, in particular working from height.   

Lindapter were approached by the contractor to offer an alternative solution to the traditional method of using bolts, nuts and back straps. The Lindapter technical support team designed a simple connection detail using Lindapter Type AF Girder Clamps to secure cantilevered support arms to the steel masts. The solution was an end plate to column design using Type AF size 5/8" girder clamps and packing pieces in a two-bolt configuration. This provided the necessary slip and tensile resistance to support the cantilevered arms over the track.

Each connection point had a Type AF clamp, grade A325 bolt, packing piece, washer, nut and locking nut, all of which could be installed quickly and easily without drilling and using only hand tools. The clamps and bolts were inserted into predrilled holes in the end plate of the cantilevered support arms and a packing piece placed between the clamp and the end plate. To complete the installation the recessed top of the clamp held the bolt captive while the washer and nuts were fitted and tightened to the recommended torque.

Type AF girder clamps provided an easy to install solution versus the traditional method of bolts, nuts and back straps. There was no need for drilling in the field which made installation quicker and safer whilst working at height. During installation, and before achieving full torque in the connection, the height of the cantilevered support arms could also be easily adjusted by sliding the girder clamp assembly up or down on the steel mast to ensure perfect positioning.  

• No drilling of the steel masts
• Quick and easy alignment of each connection
• High slip and tensile resistance
• Only hand tools required
• Safer installation