D.S. Brown Steelflex® Modular Expansion Joint Systems have gained overwhelming worldwide acceptance for accommodating and sealing large joint movements on bridge structures.
Answer: Yes, the angle at the back of the support box is used for galvanizing and handling and should be completely removed or cut between boxes where it interferes with reinforcement. If completely removing the angle, removal shall be done by grinding and not torching. Galvanizing shall be repaired according with ASTM A780, or as required by the project specifications. 
Learn more about Expansion Joint Systems
Since the early 1960s The D.S. Brown Company has provided expansion joint systems and structural bearing assemblies for bridges around the globe. Bridge expansion joint systems are directly exposed to vehicular wheel loads and, therefore, must resist dynamic forces causing fatigue and wear. In addition, these expansion joint systems must remain watertight to protect the bridge superstructure and substructure from corrosion.