The Invisible Infrastructure

by Steven R. Kramer, P.E., (M.ASCE), Principal; Jason Consulting Int. Inc., Washington, DC,


Serial Information: Civil Engineering—ASCE, 1998, Vol. 68, Issue 10, Pg. 48-51


Document Type: Feature article

Abstract:

Most developed countries have 50- to 100-year-old underground utility systems that carry far greater loads than their designs. They're difficult to repair or replace, yet they're under increasing strain. Trenchless technologies�once considered an innovation�are now becoming more common as designers seek to keep older infrastructure running smoothly. There are two common trenchless methods, guided directional drilling and microtunneling/pipe jacking. Each has its own best uses and unique set of benefits.

Subject Headings: Trenchless technology | Subsurface utilities | Infrastructure | Underground structures | Strain | Load factors | Jacking

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