Presentation on theme: "FILL TYPE RETAINING WALLS EI 10-031 EB 10-041 EB 10-042."— Presentation transcript:
FILL TYPE RETAINING WALLS EI EB EB
Overview: Wall Categories Based on how they work:
Based on how they are constructed Cut Walls: Wall is constructed top-down. Overview: Wall Categories
Fill Walls: Wall is constructed bottom-up. Overview: Wall Categories
Highway Design Manual Table 9-6 Classification of Retaining Wall Systems Overview: Wall Categories
Background: Proprietary Wall Systems Proprietary walls - Vendor designed systems protected by specific patents. Proprietary systems can only be used on State projects as follows: Chosen by competitive bid No suitable alternative Synchronization: One item only fits in a series of items, or it is part of a system Provides a unique function Experimental feature: Requires an approved Experimental Work Plan Public Interest – needs project-by-project approval
Background: Proprietary Wall Systems These rules apply to any project with Federal money (incl. Pass-Thru projects & federally funded maintenance projects). Proprietary items are submitted at PS&E (with supporting documentation and justification to FHWA) A bid proposal with an item not on the AL could be declared nonresponsive Approved Lists with less than 3 systems require justification.
Background: Proprietary Wall Systems Four Proprietary Fill Type Retaining Wall Categories: Mechanically Stabilized Earth System Mechanically Stabilized Segmental Block Retaining Wall System Precast Modular Wall System Segmental Block Retaining Wall System Approved List
Merge Existing Specifications Section 554 Section 632 SBRWS Special Section 554 Fill Type Retaining Walls Materials Bureau Testing Issue
Side Issue: Testing Blocks Wet-Cast Products Manufactured & shipped to job site in a matter of days. Based on performance criteria thru NYSDOT administered QC/QA program. Historical data of test results. Sampling and testing audit operations. Dry-Cast Products Manufactured in lots. Quarantined for sampling and freeze-thaw testing. Delayed from shipping until acceptable test results. Fairness in Testing Procedures Materials Procedure MP 09-03: Concrete Masonry Unit QA/QC Procedures
Overview: Definitions of Terms Wall System Face units are the structural support. Internally Stabilized Wall System Reinforcement added to a wall system to increase achievable wall heights. Internally Stabilized Earth System Reinforcement is the structural support. Face panels alone could not be a wall system.
Overview: Definitions of Terms Prefabricated Wall System Open Top Face Solid Face Mechanically Stabilized Wall System Reinforced Prefabricated Wall Systems Mechanically Stabilized Earth System Fill Type Retaining Walls
New Issuances Construction Standard Sheets M554-1 ( Sheet 1 of 5) Proprietary Fill Type Retaining Walls (General Notes) M554-2 ( Sheet 2 of 5) Proprietary Fill Type Retaining Walls (General Details) M554-3 ( Sheet 3 of 5) Proprietary Fill Type Retaining Walls (Typical Sections for MSES) M554-4 ( Sheet 4 of 5) Proprietary Fill Type Retaining Walls (Typical Sections for MSWS) M554-5 ( Sheet 5 of 5) Proprietary Fill Type Retaining Walls (Typical Sections for PWS) M554-6 ( Sheet 1 of 6) Geosynthetically Reinforced Soil Systems (Walls-General Notes and Details) M554-7 ( Sheet 2 of 6) Geosynthetically Reinforced Soil Systems (Walls-Typical Sections) M554-8 ( Sheet 3 of 6) Geosynthetically Reinforced Soil Systems (Slopes-General Notes and Details) M554-9 ( Sheet 4 of 6) Geosynthetically Reinforced Soil Systems (Slopes-Typical Sections) M ( Sheet 5 of 6) Geosynthetically Reinforced Soil Systems (Facing Details) M ( Sheet 6 of 6) Geosynthetically Reinforced Soil Systems (Facing Details) Design HDM Revision No. 60 (Chapter 9) Section 9.4 Retaining Walls and Reinforced Soil Slopes EB EB
New Issuances Design GRSS Specification Item XX Geosynthetically Reinforced Soil System Wall Item Geosynthetically Reinforced Soil System Slope Fill Type Retaining Wall Specification Item Fill Type Retaining Wall (0-1 m) Item Fill Type Retaining Wall (Greater than 1 m – 1.8 m) Item Fill Type Retaining Wall (Greater than 1.8 m – 2.7 m) Item Fill Type Retaining Wall (Greater than 2.7 m – 3.7 m) Item Fill Type Retaining Wall (Greater than 3.7 m – 4.6 m) Item Fill Type Retaining Wall (Greater than 4.6 m) Fill Type Retaining Wall Aesthetic Specification Item Fill Type Retaining Wall Aesthetic Treatment – Textured Surface (Hand Tooled, Raked, etc.), No Color Item Fill Type Retaining Wall Aesthetic Treatment – Textured Surface (Hand Tooled, Raked, etc.), Integral Color Item Fill Type Retaining Wall Aesthetic Treatment – Exposed Aggregate Finish, No Color Item Fill Type Retaining Wall Aesthetic Treatment – Exposed Aggregate Finish, Integral Color Item Fill Type Retaining Wall Aesthetic Treatment – Architectural Pattern, No Color Item Fill Type Retaining Wall Aesthetic Treatment – Architectural Pattern, Integral Color Item Fill Type Retaining Wall Aesthetic Treatment – Other; As shown in the Contract Documents EI
Aesthetics Default PWS (open top face units): Plain, smooth concrete finish Natural concrete (gray) color Default MSES: Plain, smooth concrete finish Natural concrete (gray) color Default PWS (solid face units): Split face finish Natural concrete (gray) color
Aesthetics Architectural Pattern Exposed Aggregate Finish Textured Surface Precast Panels or PWS (Open Top Face Units) PWS (Solid Face Units)
Expanded Approved List Master List Design Assumptions Hyperlink Drycast Concrete Wall Units Precast Concrete Wall Units Hyperlink Prefabricated Wall Systems & Mechanically Stabilized Wall Systems Precast Concrete Panel Units Mechanically Stabilized Earth Systems
Expanded Approved List 20 wall systems competitively bid against each other Dont Eliminate – Enumerate! Use Special Notes: EX. Notes for Use with Fill Type Retaining Walls in Underwater Applications: 1. The Design High Water at elevation ___ is above the bottom of wall elevation. 2. If metallic elements are used, provide additional corrosive protection to account for fluctuating water conditions throughout a 75-year design life. 3. If soil reinforcing elements are used, provide certification by a NYS PE that the design accounts for the reduced resisting soil pressures under buoyant conditions. 4. For any wall type, provide certification by a NYS PE that the wall will be stable under buoyant conditions. 5. If ice contact is expected, ensure the durability of the wall to withstand such forces. 6. Provide adequate prevention of the migration of soil through wall joints. 7. Provide weep holes with inverts no more than 4 above OHW elevation and 1 ft thickness of free-draining material between OHW and DHW elevations for the prevention of hydrostatic pressure build up behind the wall due to drawdown conditions.
Example Approved List: Master List (MSES Portion) Hyperlinks Wall System Reinforced Height Range Abutment Applications Hyperlinks
Example Approved List: Master List (PWS & MSWS Portion) Hyperlinks Wall System Reinforced Height Range Abutment Applications Hyperlinks
Design Procedure Designer Determines Need for Fill Wall GEB Provides Design Details GRSS Wall? Lines, Grades, Elevations, and Special Notes Shown in Contract Documents. Yes No Vividly Describe Aesthetic Treatments Industry-Standard Descriptions (Color, Texture, Pattern) Special Notes Special Details Need for Additional Aesthetic Treatment? Yes No Design Elements and Specifications incorporated into Contract Documents
Construction Process Wall Construction Plans Depict GRSS Wall Plans Depict Fill Wall Contractor Chooses Wall System from Approved List Contractor Submits Design and Details of Proprietary System Contractor Submits Geosynthetic Certifications Submittal Approval No Change in Process
Conclusion Merging the specifications does several things: Conformance with Competitive Bidding, provided under 23 CFR (a)(1) by identifying as many acceptable products as possible. Separates the cost of the wall function from the cost of the wall aesthetics. Eliminates bias in selection of wall type. Eliminates the State losing potential cost savings to VE proposals. Eliminates the problem of the designer sometimes specifying proprietary wall systems, and then needing a spec and a back-justification. Where special requirements warrant, create and justify a special spec.
Conclusion No change in the basic role of the RGE. In lieu of selecting a single wall type, describe the conditions, requirements and limitations of the site on the plans. More onus on the RLA. Need to vividly describe the desired aesthetic treatment on the plans using generic terms. Project Managers need to broaden their presentations of wall types Need to become familiar with the available categories (textured surface, exposed aggregate finish, architectural pattern) for presentations to communities. While negotiating a look, the PM should avoid promising the use of a specific type of wall.