In bridge expansion joint construction, H - beam can be used as a support structure. Its high strength and stability are crucial for accommodating the thermal expansion and contraction of the bridge deck. H - beam can be used to frame the expansion joint area, providing a solid foundation for the installation of expansion joint devices. These devices need to be supported firmly to ensure smooth movement of the bridge deck and prevent damage to the bridge structure due to temperature changes. Additionally, H - beam can be used to reinforce the surrounding areas of the expansion joint to enhance the overall structural integrity of the bridge at this critical section.