LFRD - Standard Culvert Plans - CBJ Single Box Bell Joints Model Name (English) Model Name (English) 2020 Description RCBJ G1-12 RCBJ G1-20 General Information for Single Span Reinforced Concrete Box Culvert Standards CBJ 1-12 CBJ 1-20 Culvert Bell Joints, 3', 4', & 5' Spans CBJ 2-12 CBJ 2-20 Culvert Bell Joints, 6' & 8' Spans CBJ 3-12 CBJ 3-20 Culvert Bell Joints, 10' & 12' Spans CBJ 4-20 Culvert Bell Joints, 14' & 16' Spans CBJ 4-12 CBJ 5-20 Culvert Bell Joints, All Spans