FILL TYPE RETAINING WALLS EI 10-031 EB 10-041 EB 10-042 Overview: Wall Categories Based on how they work: Overview: Wall Categories 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 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 List’s 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 FILL WALLS Merge Existing Specifications Section 554 Section 632 SBRWS Special Materials Bureau Testing Issue Section 554 Fill Type Retaining Walls Side Issue: Testing Blocks Wet-Cast Products Dry-Cast Products ◦ Manufactured & shipped to ◦ Manufactured in lots. job site in a matter of days. ◦ Quarantined for sampling ◦ Based on performance criteria and freeze-thaw testing. thru NYSDOT administered ◦ Delayed from shipping until QC/QA program. acceptable test results. ◦ Historical data of test results. ◦ Sampling and testing audit operations. 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 Fill Type Retaining Walls Prefabricated Wall System Open Top Face Solid Face Mechanically Stabilized Wall System “Reinforced Prefabricated Wall Systems” Mechanically Stabilized Earth System New Issuances Construction EB 10-041 ◦ Standard Sheets M554-1 (554.01 Sheet 1 of 5) Proprietary Fill Type Retaining Walls (General Notes) M554-2 (554.01 Sheet 2 of 5) Proprietary Fill Type Retaining Walls (General Details) M554-3 (554.01 Sheet 3 of 5) Proprietary Fill Type Retaining Walls (Typical Sections for MSES) M554-4 (554.01 Sheet 4 of 5) Proprietary Fill Type Retaining Walls (Typical Sections for MSWS) M554-5 (554.01 Sheet 5 of 5) Proprietary Fill Type Retaining Walls (Typical Sections for PWS) M554-6 (554.02 Sheet 1 of 6) Geosynthetically Reinforced Soil Systems (Walls-General Notes and Details) M554-7 (554.02 Sheet 2 of 6) Geosynthetically Reinforced Soil Systems (Walls-Typical Sections) M554-8 (554.02 Sheet 3 of 6) Geosynthetically Reinforced Soil Systems (Slopes-General Notes and Details) M554-9 (554.02 Sheet 4 of 6) Geosynthetically Reinforced Soil Systems (Slopes-Typical Sections) M554-10 (554.02 Sheet 5 of 6) Geosynthetically Reinforced Soil Systems (Facing Details) M554-11 (554.02 Sheet 6 of 6) Geosynthetically Reinforced Soil Systems (Facing Details) Design ◦ HDM Revision No. 60 (Chapter 9) EB 10-042 Section 9.4 Retaining Walls and Reinforced Soil Slopes New Issuances Design EI 10-031 ◦ GRSS Specification ◦ Item 554.30XX Geosynthetically Reinforced Soil System Wall ◦ Item 554.31 Geosynthetically Reinforced Soil System Slope ◦ Fill Type Retaining Wall Specification ◦ Item 554.40 Fill Type Retaining Wall (0-1 m) ◦ Item 554.41 Fill Type Retaining Wall (Greater than 1 m – 1.8 m) ◦ Item 554.42 Fill Type Retaining Wall (Greater than 1.8 m – 2.7 m) ◦ Item 554.43 Fill Type Retaining Wall (Greater than 2.7 m – 3.7 m) ◦ Item 554.44 Fill Type Retaining Wall (Greater than 3.7 m – 4.6 m) ◦ Item 554.45 Fill Type Retaining Wall (Greater than 4.6 m) ◦ Fill Type Retaining Wall Aesthetic Specification Item 554.5001 Fill Type Retaining Wall Aesthetic Treatment – Textured Surface (Hand Tooled, Raked, etc.), No Color Item 554.5002 Fill Type Retaining Wall Aesthetic Treatment – Textured Surface (Hand Tooled, Raked, etc.), Integral Color Item 554.5101 Fill Type Retaining Wall Aesthetic Treatment – Exposed Aggregate Finish, No Color Item 554.5102 Fill Type Retaining Wall Aesthetic Treatment – Exposed Aggregate Finish, Integral Color Item 554.5201 Fill Type Retaining Wall Aesthetic Treatment – Architectural Pattern, No Color Item 554.5202 Fill Type Retaining Wall Aesthetic Treatment – Architectural Pattern, Integral Color Item 554.53 Fill Type Retaining Wall Aesthetic Treatment – Other; As shown in the Contract Documents Aesthetics Default PWS Default PWS Default MSES: (open top face units): (solid face units): •Plain, smooth concrete finish •Plain, smooth concrete finish •Split face finish •Natural concrete (gray) color •Natural concrete (gray) color •Natural concrete (gray) color Aesthetics Precast Panels or PWS (Open Top Face Units) PWS (Solid Face Units) Textured Surface Exposed Aggregate Finish Architectural Pattern Expanded Approved List Drycast Design Concrete Wall Assumptions Units Hyperlink Hyperlink Prefabricated Wall Systems Mechanically Master & Mechanically Stabilized Stabilized Earth Systems List Wall Systems Hyperlink Hyperlink Precast Precast Concrete Concrete Wall Panel Units Units Expanded Approved List 20 wall systems competitively bid against each other Don’t 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) Reinforced Height Abutment Wall System Range Applications Hyperlinks Hyperlinks Example Approved List: Master List (PWS & MSWS Portion) Reinforced Height Abutment Wall System Hyperlinks Range Applications Hyperlinks Design Procedure Designer Determines Need for Fill Wall GEB Provides Yes Design GRSS Details Wall? Design Elements and Specifications No No incorporated into Need for Contract Additional Documents Lines, Grades, Aesthetic Elevations, and Treatment? Special Notes Shown in Vividly Describe Aesthetic Contract Treatments Yes •Industry-Standard Descriptions Documents. (Color, Texture, Pattern) •Special Notes •Special Details Construction Process Plans Depict Fill Wall Plans Depict GRSS Wall Contractor Chooses Wall System from Approved List Contractor Submits Contractor Submits Geosynthetic Design and Details of Certifications Proprietary System No Change Submittal in Process Approval Wall Construction Conclusion Merging the specifications does several things: Conformance with Competitive Bidding, provided under 23 CFR 635.411(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.
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