Plans for Specific Wall Types
For specific retaining wall types, include the following additional information on the layout and in the plan set.
Spread Footing Walls
- Panel design designation (for example, LC-10-32) for each panel corresponding to the appropriate cast-in-place spread footing wall standard sheet. The designation includes a reference to the controlling standard drawing, design height, and panel width information.
- Location of expansion and construction joints (Assuming 32-ft. panels, every third joint is typically designated as an expansion joint.)
- Set bottom of wall (top of footing) horizontal and stepped to meet minimum embedment criteria. (Distance from one step to the next is typically greater than 6 in. Provide bottom of wall elevations for all panels.)
- Appropriate standard sheets pertaining to cast-in-place spread footing walls. Select appropriate standard design case based on available surcharge and slope condition. Limit wall height to maximum of 20 feet as per standard. Wall height more than this limit will require custom design and approval from the Department.
Designate all information necessary for the contractor to construct the wall on retaining wall layouts for spread footing walls. This type of wall does not have a proprietary vendor to provide shop drawings, so the plan set must be complete with details.
Mechanically Stabilized Earth (MSE) Walls
- Bottom of wall shown following the proposed finished grade offset at the minimum embedment depth specified
- Appropriate standard sheets pertaining to MSE walls (e.g., RW(MSE)DD – Mechanically Stabilized Earth Retaining Wall Design Data)
Concrete Block Walls
- Bottom of wall shown following the proposed finished grade offset at the minimum embedment depth specified
- Appropriate standard sheets pertaining to concrete block walls (e.g., RW(CB)DD sheet)
Tied-Back Walls
- Type, location and spacing of tied back anchors
- Bar dimension, incline angle, and material grade
- Drill hole diameter, minimum bond length requirements, and corrosion protection measures
- Panel and closure-pour width dimensions
- Bottom of wall shown with a level footing elevation, also referred to as having steps. (Distance from one step to the next is typically greater than 6 in.)
- Performance load test requirement
Designate all information necessary for the contractor to construct the wall on retaining wall layouts for tied-back walls. This type of wall does not have a proprietary vendor; however, shop drawings are required to fully detail the panel schedule to be used on the project and information regarding proposed anchor length.
Soil/Rock Nailed Walls
- Location of expansion and construction joints spaced at intervals not to exceed 90 ft.
- Set bottom of wall horizontal and stepped to meet minimum embedment criteria. (Distance from one step to the next is typically greater than 6 in. Provide bottom of wall elevations for all panels.)
- Estimated quantity for “Soil/Rock Nail Anchors”
- Typical section showing existing or proposed foundations or other obstructions that may interfere with wall construction
- Test nail lengths, loads, and quantities
- Nail incline angle, bar grade and size, and corrosion protection measures
- Wall facing and nail head connection
- Reinforcement details and shotcrete thickness
- Proof and verification load test requirements
Designate all information necessary for the contractor to construct the wall on retaining wall layouts for nailed walls. This type of wall does not have a proprietary vendor to provide shop drawings, so the plan set must be complete with details.
Drilled Shaft Walls
- Set bottom of wall horizontal and stepped to meet minimum embedment criteria
- Panel width dimensions and concrete closure pour connection
- Provide cap, stud anchor connection detail sheets including closure pilaster if any
- Bottom of wall shown with a level footing elevation, also referred to as having steps. (Distance from one step to the next is typically greater than 6 in. Provide bottom of wall elevations for all panels.)
- Estimated quantity for “Drilled Shaft” used on wall (This quantity is broken into specified shaft diameters.)
Designate all information necessary for the contractor to construct the wall on retaining wall layouts for drilled shaft walls. This type of wall does not have a proprietary vendor to provide shop drawings, so the plan set must be complete with details.
Temporary MSE Walls
- Bottom of wall shown following the proposed finished grade offset at the minimum embedment depth specified
- Appropriate standard sheets pertaining to temporary MSE walls (including RW(TEW)DD sheet)
Reinforced Soil Slope
- Bottom and top of existing slope following the proposed finished grade offset
- Existing and proposed slope grade
- Geogrid reinforcement length, details and backfill requirements
- Temporary special shoring if needed
- Limits of excavation and benching for the placement of backfill
Designate all information necessary for the contractor to construct RSS. This type of system does not have a proprietary vendor to provide shop drawings, so the plan set must be complete with details.