1)
What is the meaning of "v'Al Yadam"?
1.
Ibn Ezra: This is like "v'Ish Al Yado l'Digleihem" ? due to them. Due to the builders, Ploni and Almoni persisted to build.
2)
Why does it say "Hecheziku"?
1.
Rashi: They persisted to build.
2.
Malbim: Wherever it says Banah, the wall had fallen, and they needed to build afresh. Wherever it says Hechezik, they needed only to strengthen the old wall and seal the breaches.
