ABSTRACT

I'· 40.7.3 Ground Movement 40/17 40.7.4 Pipe jacking with slurry shields 40/19 40.7.5 Pipe jacking with steerable borers 40/19 40.7.6 Pipe jacking with non-steerable augers 40/20 40.7.7 Pipe ramming 40/20 40.7.8 Impact moting 40/20 40.7.9 Directional drilling 40/20

40.8 Man-accessible tunnels 40/20 40.8.1 Site investigation 40/21

40.8.2 Headings 40/21 40.8.3 Steel liner plates 40/21 40.8.4 Precast concrete segmentallininp <40/21 40.8.5 Triple segmental block (minituanel

system) 40/22 40.8.6 Pipe jacking 40/22 40.8.7 Ground movement 40/23

40.9 Working in confined spwes 40/23

40.-10 Rehabilitation of pipes and sewers 40/25 40.10.1 Inspection and basic strategy 40/25 40.10.2 Methods of rehabilitation 40/29

40.11 Costs 40/29 40.11.1 Project cost appraisal 40/29 40.11.2 Construction costs 40/30

References 40/31

Bibliography 40/31

Buried pipelines are used to transport fluids which may be gases, liquids or slurries. The pipes may operate at high or low pressure. The pipelines may form part of extensive structures such as large national grids or be limited in extent, such as culverts under roads. Consequently, a wide range of skill and engineering expertise is needed to construct and maintain the structures which represent a considerable capital investment and form a significant proportion of any developed country's infrastructure.