Bidding for the construction of a reinforced concrete footbridge, Bang Mut, Lower Line, Village No. 4, Tha Thong Mai Subdistrict, connecting to Tha Thong Mai Subdistrict Municipality, Village No. 5, Tha Thong Mai Subdistrict, Kanchanadit District, Surat Thani Province, by electronic bidding (e-bidding)