construction quality assurance for mse walls
TRANSCRIPT
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Construction Quality Assurance for MSE
Walls By Alex Abraham, P.E.
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Typical section & components of MSE structures
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Supplier Design • Formal Policy • System Approval • Design Manual, Details • Specifications • Bid Documents • Supplier Design • Review
Design Bid Build
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Organization Chart Supplier Design `
Owner
Design Engineer
Construction Inspector
QA Lab
Contractor
Material Suppliers QC Lab
Construction Division Manager
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Inspector’s Responsibility
To be thoroughly familiar with • Plans and Specifications • Site Conditions • Construction Materials • Construction Sequence
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Inspector’s Tools • Design Drawings • Shop Drawings • Specs • Health and Safety Requirements • Field testing equipment • Trained Staff • CQA Plan • Inspector’s Handbook
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Foundation Preparation
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Leveling Pads
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Facing Panels
Plant Certification Liner Fabrication Drawings Test Panels for Liner and Stain
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Panel Storage
Protect Connection Device Protect Panel Face Protect Damage to Panels - Cracks, Chipped Corners
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Precast Concrete Panels
Certifications Inspect before the panel is placed on the wall. Place the correct panel at the right location.
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Facing Assembly
5
Plumb, vertical tolerance, and horizontal alignment tolerance = ¾” over 10’ Allowable offset in panel joint = ¾” The overall plumb from top to bottom = 0.05 in./ft.
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Provide Fall Protection as Required
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Filter Fabric
Specifications for filter cloth Placement
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Precast Concrete Panels
Specifications for filter cloth Exposure to direct sunlight Placement
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Precast Concrete Panels
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Strips Stockpiled on site
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Reinforcing – Type, Length, Spacing
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A 4
L 6
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Connections
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Catch Basin
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Offset Reinforcements Using Strongbacks at Large Obstructions
Reinforcements bolted to strongback
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Parallel Pipes
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Parallel Pipes
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Reinforcement Strip Skew
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Accommodating Deep Foundations
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Existing Drainage Structures
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Drainage Penetrations
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Select Granular Fill Structure Backfill, Type 3 (excludes No. 30)
• Approved Source • Approved Testing Lab • Laboratory Testing:
• Gradation • Unit Weight (Compaction Control) • Friction Angle • Organic Content • Permeability • Resistivity and pH
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Compact Backfill (only walk-behind compactor close to wall)
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Select Granular Fill Structure Backfill, Type 3 (excludes No. 30)
• Field Testing for No. 4 size: • Criteria – 95% • Tests Defined - Section 203.24(b) -
Nuclear Density, Sand Cone and One Point Proctor
• Moisture Content
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Select Granular Fill Structure Backfill, Type 3 (excludes No. 30)
• Field Testing for all sizes other than No. 4 size:
• No density tests • 4 passes with a vibratory roller and 1
pass with the same roller in the static mode.
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B-Borrow (Triangular Wedge of Fill Behind Select Fill)
• Source approved by tests • Testing:
• Gradation ( no more than 10% passing No. 200 sieve)
• Suitably graded • Frequency of testing (1 per 2,000 t or two per
contract)
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Fill in front of the wall • Backfilled as soon as practically
possible • A strong rainstorm could cause
heavy flow along the wall. This could cause soil erosion and undermining of the leveling pad and wall.
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Drainage Section 718.03 for underdrains Location as per plans
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Walls subject to Flooding Select Backfill - limited to No. 8 stone
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Ancillary Items • Barriers
• Cast-in-place barrier • Guard rail
• Coping • Precast coping • Cast-in-place coping
• Abutments
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Precast Concrete Panels
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Cast-in-Place Coping
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Precast Coping
Precast Coping
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Skew Top Level of Reinforcements To Clear Guide Rail Post Locations
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Guard rails
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Interface at CIP
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Interface at CIP
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Slip Joints
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Slip Joint
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Construction Phasing
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Acute Corners
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Acute Corners
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MSE WALL ASSETS SUPPORT OTHER ASSETS
Highways, ramps, embankments
Bridge abutments
Traffic barriers, noise barriers, lighting, signs, signals
Drainage pipes, culverts (penetrations)
Planters & plantings
We know how to manage these assets
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When Should We Evaluate Retaining Wall Assets?
• During construction (QA/QC) • Periodic (routine) performance inspections • Extreme events (seismic, flood, impact) • Before widening, load changes,
rehabilitation • As part of plan to extend useful life – as
part of asset management
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Core Questions About MSE Walls
What is the current state of my MSE walls ? • What do I own? • Where is it? • What condition is it in? • What is its remaining useful life? • What is its remaining economic value?
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More Core Questions • Which assets critical for sustained performance?
• How do they fail?
• How can they fail?
• What is the likelihood of failure?
• What will it cost to repair?
• What are the consequences of failure?
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Core Questions - Paraphrased
What are my best investment strategies for "Moving Indiana into a Prosperous New World" ?