Page 12 - Trenchless Technology Piping Installation and Inspection

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6.8 Design Considerations . . . . . . . . . . . . . . . . . . . 241
6.8.1 Utility Survey . . . . . . . . . . . . . . . . . . . . 241
6.8.2 Investigation of Existing Pipe and
Site Conditions . . . . . . . . . . . . . . . . . . . 242
6.8.3 Insertion and Pulling Shaft
Requirements . . . . . . . . . . . . . . . . . . . . 242
6.8.4 Geotechnical Investigation
Requirements . . . . . . . . . . . . . . . . . . . . 243
6.8.5 Maximum Allowable Operating
Pressure . . . . . . . . . . . . . . . . . . . . . . . . . 245
6.8.6 Risk Assessment Plan . . . . . . . . . . . . . 245
6.8.7 Ground Movements . . . . . . . . . . . . . . . 247
6.8.8 Drawings and Specifications . . . . . . . 248

6.8.9 Submittals . . . . . . . . . . . . . . . . . . . . . . . 249
6.8.10 Quality Assurance/Quality Control
Issues . . . . . . . . . . . . . . . . . . . . . . . . . . . 249
6.8.11 Dispute Resolution Mechanisms . . . . 250
6.8.12 Permitting Issues . . . . . . . . . . . . . . . . . 251
6.8.13 Cost Estimating . . . . . . . . . . . . . . . . . . 251
6.9 Construction Considerations . . . . . . . . . . . . . . 252
6.9.1 Typical Pipe-Bursting Operation
Layout . . . . . . . . . . . . . . . . . . . . . . . . . . 253
6.9.2 Shoring the Entry and
Pulling Shafts . . . . . . . . . . . . . . . . . . . . 254
6.9.3 Matching System Components to
Reduce Risk of Failure . . . . . . . . . . . . . 255
6.9.4 Nearby Utilities . . . . . . . . . . . . . . . . . . 255
6.9.5 Bypass Pumping . . . . . . . . . . . . . . . . . . 256
6.9.6 Dewatering . . . . . . . . . . . . . . . . . . . . . . 256
6.9.7 Ground Movement Monitoring . . . . . 256
6.9.8 Manhole Connections . . . . . . . . . . . . . 257
6.9.9 Pipe Connection to Other Pipes . . . . . 260
6.9.10 Pipe Bursting Water Mains . . . . . . . . . 260
6.9.11 Service Connections . . . . . . . . . . . . . . . 261
6.9.12 Grooves on the Outside Surface
of the Pipe . . . . . . . . . . . . . . . . . . . . . . . 262
6.9.13 As-Built Drawings . . . . . . . . . . . . . . . . 264
6.9.14 Contingency Plan . . . . . . . . . . . . . . . . . 264
6.9.15 Safety Considerations . . . . . . . . . . . . . 265
6.9.16 Potential Problems . . . . . . . . . . . . . . . . 265
6.10 Sample Pipe Load Calculations . . . . . . . . . . . . 267
6.10.1 Introduction . . . . . . . . . . . . . . . . . . . . . 267
6.10.2 Pulling Loads—Theoretical
Considerations . . . . . . . . . . . . . . . . . . . 267