Page 10 - Buried Pipe Design

viii Contents
Polyethylene (PE) Pipes 459
Handling factor 461
Long-term ductility of polyethylene materials 465
The ESCR test 467
The HDB requirement for PE 467
The NCTL test 468
Structural performance of buried profile-wall HDPE pipe 469
Performance limits and preliminary design recommendations
for profile-wall HDPE pipes 501
Acrylonitrile-Butadiene-Styrene Pipes 505
Other Thermoplastic Pipes 507
Thermoset Plastic Pipe 508
Reinforced thermosetting resin pipe 509
References 517
Chapter 8. Pipe Installation and Trenchless Technology 521

Introduction 521
Transportation 521
Trenching 522
Dewatering 525
Pipe Installation 525
Making the Joint 526
Thrust Blocks. ( See Chap. 4) 527
Pipe-Zone Soil. (See Chaps. 2 and 3) 527
Bedding and Backfill 527
Embedment Density 528
Safety Procedures for Construction and Related Activities 528
Introduction 528
Pipe storage 528
Shoring and bracing 529
Hard hats 530
Lifting 530
Safe distance 530
Ladders 530
Adequate means of trench exit 530
Edge of excavation 530
Falling tools 530
Keep open traffic lanes clear 530
Posting barricades and warning signs 530
Debris in excavation 531
Heavy rains or freezing weather 531
Cave-ins 531
Overhanging bank 531
Other utility lines 532
Protective clothing 532
Machines 532
Work breaks 532
Trenching machines 532
Blasting operations 533
Storing explosives 534
Working in confined spaces 535
Trenchless Technology 536
Introduction 536
Design of pipe liners 537