Proposed Practice for Alternative Bidding of Highway Drainage Systems (2015) / Chapter Skim
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Pages 83-114
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From page 83... ...
83 Recommended Practice for Bidding Alternative Drainage Pipe Systems A P P E N D I X A INTRODUCTION The evaluation and selection of suitable and cost effective drainage pipe systems for highway projects involves consideration of a range of engineering suitability criteria, installation requirements, and construction and post-construction maintenance costs. The availability of a streamlined, rational and reliable design approach that identifies a wide range of appropriate pipe system alternatives on a consistent and unbiased basis would allow owners and agencies to take advantage of increased product competition with lower overall costs for procuring highway drainage systems.
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84 1.4. The RP also provides guidance for post-installation inspection and agency acceptance of drainage pipe systems.
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85 2.2. ASTM Standards • • • • • • • • • • • • • • • • • • • • • • G51, Test Method for Measuring pH of Soil for Use in Corrosion Testing D1293, Test Methods for pH of Water D5464, Test Method for pH Measurement of Water of Low Conductivity D1125, Test Methods for Electrical Conductivity and Resistivity of Water D512, Test Methods for Chloride Ion In Water D516, Test Method for Sulfate Ion in Water D3858, Test Method for Open-Channel Flow Measurement of Water by Velocity-Area Method D5243, Test Method for Open-Channel Flow Measurement of Water Indirectly at Culverts D420, Standard Practice for Conducting Geotechnical Subsurface Investigations 2.3.
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86 Backfill The material used to refill a ditch or other excavation, material placed adjacent to or around a drainage structure, or the process of doing so. Bedding The soil or other material on which a pipe is supported.
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87 200 sieve. Silt tight joints provide protection against infiltration of backfill material containing a high percentage of fines.
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88 PPI: Plastic Pipe Institute PSIC: Pipe System Identification Code PVC: Polyvinyl Chloride RCP: Reinforced Concrete Pipe RCB: Reinforced Concrete Box RSC: Ring Stiffness Constant S: Structural SDR: Standard Dimension Ratio SHRP2: Second Strategic Highway Research Program SIDD: Standard Installation Direct Design SRSP: Spiral Rib Steel Pipe TRB: Transportation Research Board USACE: United States Army Corps of Engineers 4.
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From page 89... ...
89 promotes the implementation of the latest national standards and other state of the practice design evaluation methodologies with the intent of being as comprehensive as possible while also allowing the flexibility to incorporate agency-specific standards or requirements. The matrix approach developed for technical evaluations within the RP is intended to provide clarity of design decisions and to allow for data tracking and mining for future agency use or for research to improve policies and methods.
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90 5.5. The RP is intended to be flexible to account for individual state policies and procedures as well as potential future changes in policy, regulation or availability of new pipe products and evaluation methods.
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91 evaluation steps: hydraulic ("H") , structural ("S")
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92 Figure 3 - Overall Composite Results Matrix for RP 5.9. Note - While not required as part of implementation, the RP is intended to facilitate database tracking of an in-service drainage pipe system inventory to allow for more systematic and efficient maintenance, renewal, and replacements in line with the goals of the Second Strategic Highway Research Program (SHRP2)
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93 Pipe Size• • • • • • • • • • • Pipe Shape Pipe Profile Pipe Material Type Pipe Coating or Lining Condition Pipe Structural Class (presented as minimum and maximum allowable fill height) Pipe Joint Type Pipe Roughness (in terms of Manning's n value)
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94 systems within the RP matrix (Figures 2 and 3) , on construction documents, and on as-built drawings to identify the full range of pipe system characteristics.
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95 Functional Classification: arterial, collector, local, etc.• • • • • • • • • Roadway Number Drainage System Type: Culvert or Storm Sewer Station of Culvert Inlet or Station Range for Storm Sewers Pipe System ID (as defined in Section 6.3.2 or similar) Installation Date: Month and Year Original Design Service Life in Years Current Estimated Service Life or Achieved Service Life to Failure Failure Causation Mechanism(s)
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96 6.5.1. Note - This inventory could also form the basis for an asset management system for drainage pipe systems, to assist with establishing long term pipe replacement and rehabilitation budgets.
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97 Unique Project, Bid, or Agency-wide identifier • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • Type of installation or pipe function (culvert or storm sewer) Location Road way functional classification Design service life Culvert length Minimum fill height Maximum fill height Maximum pipe size (considering vertical and lateral conflicts)
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99 7.5.2.3. Note - Test values can be seasonally affected by such factors as rainfall, flooding, drought, decaying vegetation, and man-made influences (e.g., fertilizer or road salt runoff)
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From page 100... ...
100 Ground freezing and other cold weather considerations High maximum temperatures can impact the material service life of thermoplastics and other pipe materials and may require special design considerations • ▪ ▪ • • • Erosion and scour potential Fire risk and consequence Roadway chemical spill risk and consequence Other geologic, environmental, or man-made conditions 7.7. Output from Phase 1 - Set the Inventory of Evaluated Pipe Systems 7.7.1.
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101 8.3. Stage 2A – Hydraulic Evaluation 8.3.1.
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102 8.4. Stage 2B – Structural Evaluation 8.4.1.
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103 8.5.3. For a design to be technically acceptable the EMSL must be greater than or equal to the DSL.
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104 Level Pipe Material Guidance Aluminized steel (Type 2) not recommended without invert protection or increased gauge thickness (equivalent to galv.
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105 8.5.8. Concrete Pipe.
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106 8.5.8.2. Aluminized Type 2 Steel Pipe.
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107 8.5.10.1. The EMSL values for the materials listed in 8.5.10 can be established by past performance history or by application of the above listed methods for pipes with equivalent component materials.
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108 9.1.2. • • • Output from Phase 2 should be reviewed by the engineer to Identify possible errors and inconsistencies.
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110 11.3.1. Diameter for Baseline Smooth Pipe The first element of the code is a three digit number specifying the minimum equivalent circular diameter for the baseline smooth circular pipe case using a Manning's n of 0.012.
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111 11.4.5. The 1st digit represents concrete pipe.
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112 Phase 5 of the RP describes the recommended steps for overall quality control, inspection and tracking. The five main steps in this phase are described in separate sections below.
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113 12.3. Post-Installation Inspection and Approval 12.3.1.
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114 15. REFERENCE MATERIALS There is a vast and evolving literature on highway drainage pipe systems, and the following list is a sample of the technical literature on the topic.
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