Is it permissible to perform Tayammum for the Dhuhr and Asr prayers at work due to time constraints and the difficulty of performing Wudu?

It is not permissible to perform tayammum due to the narrowness of the place for ablution. Rather, ablution is obligatory even if it involves difficulty or by placing water in a vessel, because tayammum is only prescribed when water is unavailable or cannot be used due to illness or the like. One must perform the prayer at its appointed time with tranquility, without failing to observe its pillars or obligations.