PRECAST CONCRETE UNDERGROUND UTILITY...
Transcript of PRECAST CONCRETE UNDERGROUND UTILITY...
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PRECAST
CONCRETE
UNDERGROUND
UTILITY VAULTS
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OUTLINE
• Purpose
• Precast Advantage
• Purpose of Utility Vaults
• Uses of Utility Vaults
• Applicable Standards
• Structural Design
• Materials
• Production
• Installation
• NPCA Plant Certification
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PURPOSE
• Provide current and accurate
technical information as it relates to
the design, production and
installation of precast concrete utility
vaults.
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PRECAST ADVANTAGE
• Available nationwide
• Environmentally friendly
• Non-combustible
• Long life span and durability
• Delivered and set by manufacturer
• Less maintenance than CMU
• Easily designed to withstand traffic or aircraft loading
• Mass
• Faster installation – large structures easily designed
• Produced in a controlled environment
• Cost effective
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PURPOSE
• Provide easy accessto equipment formaintenance.
• Provide structurallysound enclosure.
• Provide a secureenclosure for costlyequipment.
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PURPOSE of UTILITY VAULT
• Protect vital underground connections and controls
for utility distribution.
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APPLICATION
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APPLICATION
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APPLICATION
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APPLICATION
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USES of UTILITY VAULTS
• Communications
• Electricity
• Gas
• Steam
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APPLICABLE STANDARDS
• ASTM C 857Practice for Minimum Structural Design Loading
for Underground Precast Concrete Utility
Structures
• ASTM C 858Specification for Underground Precast Concrete
Utility Structures
• ASTM C 891Practice for Installation of Underground Precast
Concrete Utility Structures
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APPLICABLE STANDARDS
• ASTM C 1037Practice for Inspection of
Underground Precast
Concrete Utility Structures
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APPLICABLE STANDARDS
• ACI 318Building Code Requirements for Structural
Concrete
• AASHTOSpecification for Highway Bridges
• Project Specific Requirements
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REFERENCES
• NPCA Best
Practices Manual –
Precast Concrete
Utility Vault
Manufacturing
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REFERENCES
• NPCA QualityControl Manualfor Precast Plants
• Local Codes andRegulations
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STRUCTURAL DESIGN
• Loading Conditions
Surface surcharge
Concentrated wheel loads
Lateral loads
Presumptive soil bearing capacity
Buoyant forces
Connections and penetrations
Point loads
Live loads
Dead loads
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STRUCTURAL DESIGN
• Concrete ThicknessSufficient to meet minimum reinforcement cover andwithstand design loading conditions.
• Concrete Mix DesignConcrete Compressive Strength – Minimum 4,000 psistrength at 28 days.
w/c < .45 (water/cementitious ratio).
Quality materials using well-graded aggregates.
Air entrained in accordance with ACI 318.
• ReinforcementReinforcement design by structural calculations as requiredby code or as proven by testing.
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MATERIALS
• CementThe majority of cement
used in the manufactured
concrete products industry
is governed by ASTM C 150
“Standard Specification for
Portland Cement.”
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MATERIALS
• Aggregates
Well-graded, sound,
nonporous aggregate
conforming to ASTM
C 33, “Standard
Specification for
Concrete Aggregates,”
is essential in the
production of high-
quality precast
concrete.
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MATERIALS
• WaterWater for mixing high-quality
precast concrete shall meet
ASTM C1602, “Standard
Specification for Mixing Water
Used in the Production of
Hydraulic Cement Concrete.”
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MATERIALS
• Admixtures & SupplementaryCementitious Materials (SCMs)
Admixtures and SCMs allow the manufacturer to fine-
tune and enhance the properties of the concrete mix.
Air entraining admixtures per ASTM C 260 improve
freeze-thaw properties while SCMs per ASTM C595
and C618 have impacts upon the water content and
can lead to significant improvements in the physical
properties of the concrete.
• Today, precast concrete is thehigh-tech material of choice.
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MATERIALS
• ReinforcementReinforcement of concrete
is required and must be
provided and designed to
meet structural loading and
handling conditions of the
structure.
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MATERIALS
• ReinforcementReinforcement types can
vary from WWM to
conventional rebar to
fibers – all reinforcement
must comply with
applicable standards.
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PRODUCTION
• Pre-pour InspectionTrained and qualified plant personnel perform
inspection before each pour to verify form
cleanliness, proper amount of release agent, and
reinforcing steel placement and configuration.
• Post-pour InspectionAs an essential part of the production process, the
post-pour inspection verifies product conformance
to project specifications.
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PRODUCTION
• Final InspectionValidation of Quality
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INSTALLATION
• Proper installation is absolutely
critical for maintaining the inherent
quality of plant-manufactured
concrete utility structures, and
considerations include:Proper connections
Planning for site conditions
Excavation and bedding
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INSTALLATION
Vault placement
Proper sealing methods
Installation of access risers and entry
Penetrations
Backfilling procedures
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NPCA PLANT CERTIFICATION
• Quality Control
Manual to ensure the
production of quality
precast products
• Plant Inspections
conducted by third-
party consultants