TRENCHLESS TECHNOLOGY APPLICATION FAILURES: CAUSES, REMEDIAL MEASURES AND AVOIDANCE

摘要

The trenchless technology industry continues to be an emerging industry. Every day utility staffrnmember and consulting engineers are informed of new products to reduce sewer collectionrnsystem repair costs. These products must be demonstrated under actual field conditions beforernthey are recommended for use. The products must often undergo a development process tornrefine installation techniques before they are considered reliable repair alternatives that can bernspecified. Even established technologies that have been in use for many years can fail when notrnspecified for the proper application or properly installed.rnDifferent parties are involved in every sanitary sewer rehabilitation project: utilities, engineers,rncontractors, material manufactures, and inspectors. Each party has a different role and goal, butrneach party must perform his part successfully in order to have a successful repair. In all phasesrnof a typical rehabilitation project, preliminary investigation, design, bidding, construction andrnwarranty period mistakes can be made, which lead to eventual defects in or even the failure ofrnthe final product. The trenchless technology selection and application can lead to defects andrnfailures when some of the following situations occur: sanitary sewer problem misdiagnosis,rninadequate technology selection, poor design and inadequate specifications, improperrninstallation, or inadequate inspection.rnThis paper addresses some of the most common trenchless technology application failuresrnexperienced in South Florida. It focuses on what caused the failures, how to avoid them in thernfuture, and how they were remediated.