What are "Dovros"?
Rashi: They are called "Rafsodos" in Divrei ha'Yamim II, 2:15 (rafts). They tie logs together (Radak - at the ends) and float them on the water and lead them, like ships.
What is "ha'Makom Asher Tishlach Elai"?
Rashi: It is where you want me to bring them there.
What is the meaning of "v'Nipatztim"?
Rashi: I will untie them and take each log onto the land by itself.
Radak citing Targum Yonasan: I will untie them and cast them there. Niputz is spreading out.
What is "Lechem Beisi"?
Radak: It is [the food of] those who eat at my table. In Divrei ha'Yamim II, 2:9, Shlomo said that he will give 20,000 Korim of wheat and of barley for the workers who cut the trees.