2008 Bridge Planning SeminarDesign Data Drawing Layout

Bridge Planning Drawings• Generally prepared for major bridge structures• Referred to as Design Data or DD Drawings• Used to consolidate survey, hydrotechnical, highway

design and geotechnical information• Documents bridge planning design• Can be used to present design alternatives • Generally 2 two 3 drawings. Additional drawings

may be required to show unique details.• DD Drawings not used for construction.• Drawing information used by structural designers to

produce detailed design/ construction drawings.

Design Data Sheets• Generally 1 or 2 sheets. • First DD Sheet: Site Map, Notes and Bridge Section• Notes: Survey By, Benchmarks, Hydrotechnical Summary,

General Notes• Site Plan view: Crossing location, skew, approach fills,

headslope protection works, river training• Elevation view: Existing ground lines / sods, design

gradeline, channel bedwidth, headslopes, bridge out to out opening, design highwater/ ice elev, min bottom girder /flange elev, headslope protection, test holes

• DD Drawings can also be used for major bridge culvert structures, grade separations, railway crossings

Boyer River Bridge - Design Data Sheet

Smoky River Bridge - Design Data Sheet 1

Smoky River Bridge - Design Data Sheet 2

Mosaic Profile• Airphoto Mosiac: Details parcel mapping, land titles,

bridge location• Streambed Profile: Surveyed profile of channel bed

and water / ice level, average channel slope• Road / Highway Profile: Details existing centerline

ground / sod profiles, new design gradeline, bridge opening, highwater

Boyer River Bridge - Mosaic Profile

Smoky River Bridge – Mosaic Profile

Issues• DD Drawings are required on as need basis based on

discussion with structural designers and client. Detailed sketches may be adequate.

• Interaction with structural designers during bridge planning process. Determine possible span arrangements, structural depths, pier locations, etc.

• Grid –To – Ground Survey, Combined scale factor, Design Bulletin 34

• Test holes: Several ways to show on drawing. Ensure holes are surveyed correctly.

Issues• Airphoto for mosaic profile: Several programs

available for correcting image. Determine if mosaic just for presentation to determine effort in processing image. Ortho-corrected airphotos are available.

• Highway/ Road Profile: Centerline finished crown or subgrade

• Showing new construction tying into existing fills• Stationing bridges on curve on divided highway • Other Issues…. Open for discussion.