Session 7: Retrofitted Edge Drains 7.1
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1 Session 7: Retrofitted Edge Drains 7.1
2 Learning Outcomes 1. List benefits of drainage 2. List components of edge drain systems 3. Describe recommended installation procedures 4. Identify typical construction problems and remedies 7.2
3 Effects of Water Excess water in a pavement can lead to: Weakened pavement layers Critical distresses Pumping Faulting Corner breaks 7.3
4 Critical Distresses 7.4
5 Addressing Excess Moisture In New Pavements Seal the pavement Use nonerodible base materials Incorporate combative design features (e.g., dowels) Incorporate drainable base In Existing Pavements Seal the pavement Add retrofitted drainage 7.5
6 Purpose of Retrofitted Edge Drains Remove surface infiltration water from beneath pavement Shortens drainage path Gets water out more quickly Alleviate moisture problems on older pavements with inadequate drainage Delay or slow the development of moisture-related distresses 7.6
7 Drainage Paths Pavement surface Base daylighted (clogged) Existing flow path Granular base Pavement surface Granular base Outlet New shortened Flow path Fig. 7.1 on p
8 Project Selection Considerations Characteristics of good candidates Early stages of moisture-related distress Minimal cracking (<5% slabs cracked) Young in age (< 10 years) Acceptable geometrics Not recommended on pavements where base contains > 15 to 20% fines Recommended evaluation procedures: Distress survey Possibly subsurface borings 7.8
9 Limitations and Effectiveness Not intended to address subsurface drainage conditions (high water tables, lateral seepage) Mixed performance Pavement too badly deteriorated Difficulty in improving drainage characteristics Poor installation Inadequate maintenance 7.9
10 Types of Retrofitted Edge Drains Pipe edge drain Prefabricated geocomposite edge drain 7.10
11 Retrofitted Edge Drain Types Typical Pipe Edge Drain PCC Pavement Shoulder Nonerodible base Aggregate subbase Backfill Drainage pipe Geotextile Fig. 7.2 on p mm (8-10 in) 7.11
12 Retrofitted Edge Drain Types Geocomposite Edge Drain (PGED) PCC Pavement Shoulder Base Sand backfill Panel drain 25 mm (1 in) Fig. 7.4 on p mm (4-6 in) 7.12
13 Cross-Section of a PGED 7.13
14 Comparison of Edge Drain Types Advantages of Pipe Edge Drains Can be easily flushed/cleaned Less potential of damage Larger capacity Can be inspected with video cameras Advantages of PGEDs Less expensive Easier to install 7.14
15 Design Considerations Inflow PCC Slab Base Outflow q i (inflow) Drain Type Q (outflow) Drain Sizing Edge drain details Trench Filter Outlets Backfill Other repair considerations 7.15
16 Construction Procedure Pipe Edge Drains 1. Trenching 2. Placement of geotextile 3. Placement of drainage pipes 4. Connection to outlets 5. Backfilling of trench (material compaction) 6. Headwalls and outlet pipes 7.16
17 Installing Pipe Edge Drains Automated Equipment Corrugated plastic tubing Hopper Compactor Gate Digging chain Groover Boot Compactor Fig. 7.8 on p
18 Installing Pipe Edge Drains Cutting The Trench 7.18
19 Installing Pipe Edge Drains Placing the Geotextile and Drain 7.19
20 Installing Pipe Edge Drains Trench Backfilled 7.20
21 Retrofitted Edge Drains Construction Process PGEDs 1. Trenching 2. Placement of PGED 3. Connection to outlets 4. Backfilling of trench (water puddling method of compaction) 5. Construction of headwalls 7.21
22 Installing PGEDs 7.22
23 Installing PGEDs 7.23
24 Outlets C L 10 year flow 150 mm (6 in) Longitudinal edge drain 3% slope Rigid outlet pipe Ditch Fig. 7.5 on p
25 Headwalls 45 o Precast concrete headwall in slope 3/4 2 6 Top view 6 Rodent shield 1/4-3/8 openings Front view Fig. 7.6 on p Side view
26 Key Factors For Success Selection of proper candidate projects Proper design of system Maintain correct line and grade of longitudinal drains Avoid damage to pipes during installation Proper compaction techniques Proper installation and marking of outlets Maintain the system! 7.26
27 Troubleshooting Common Problems Crushed or punctured outlets Clogged outlet pipes or edge drains Missing rodent screens at outlets Missing outlet markers Erosion around outlet headwalls Shallow ditches clogged with vegetation 7.27
28 Typical Causes of Poor Performance Improper use or application Damage during installation (poor construction practices) Edge drain clogging (especially PGEDs) Lack of post-installation maintenance Inappropriate use of, or failure to provide, other needed pavement repairs 7.28
29 Importance of Maintaining Subdrainage Systems Poorly maintained drains can be worse than having no drains at all! 7.29
30 Components of an Effective Drainage Maintenance Plan Placement of outlet markers Mowing around drainage outlets Conduct inspections at least twice a year Inspection of outlets Removal of vegetation/debris at outlets Replacement of missing rodent screens, outlet markers, and eroded headwalls Flushing/rodding of drains Inspection of ditches 7.30
31 Video Inspection of Pipe Edge Drains 7.31
32 Video Inspection of PGEDs 7.32
33 Review: Learning Outcomes 1. List benefits of drainage 2. List components of edge drain systems 3. Describe recommended installation procedures 4. Identify typical construction problems and remedies 7.33
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