Just refer to the spun pile catalogue and calculate the weight yourself. For 400mm diameter spun pile, there are several classes A, B and C and the grade as well, Grade 80 or Grade 90. There will be a slight variation in the weight with these different classes or grades of the spun pile.

You will also need to estimate the total length of the piles to calculate the tonnage of the piles. The link of the catalogue is as below.

http://www.ijm.com/ICPB/uploadfolder/broch...ember13_New.pdf