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THE 500 K.V. TRANSMISSION LINE PROJECT

Client:

Northern States Power Co.
414 Nicollet Mall
Minneapolis, MN 55401
Project:

Foundation Evaluation and Rehabilitation
for the 500 K.V. Transmission Line.
Forbes-Manitoba Hydro-Interconnection
Northern Minnesota

Duration: 1993 through 1998

PROJECT PROFILE

The 500 K.V. Transmission Line is carried by steel and aluminum towers. The steel towers are supported by four cast-in-place concrete drilled piers.

Construction of the line extended from 1976 through 1980. During its service life, the concrete foundations had shown some signs of deterioration. To preserve the integrity of the line, NSP PhotoNorthern States Power Co. NSP, contracted Jaber Engineering Consulting, Inc. JEC, to investigate the cause of the concrete deterioration of the structure foundations.

JEC performed a comprehensive Forensic Engineering program to evaluate the concrete deterioration. The program included:

Visual inspection of drilled pier foundations.
 Concrete coring and sampling.
Laboratory testing and analysis.
Petrographic analysis of concrete.
Evaluation of concrete durability.

Our engineers determined the cause of the concrete deterioration and provided NSP with repair options to restore the integrity of the foundations.

NSP and JEC then conducted a pilot program to examine the feasibility of the repair options and to select the most appropriate one for the foundation repair.

Based on the finding of the pilot program, NSP initiated a four-phase repair program to repair the pier foundations over a period of five years.

During the repair program JEC provided:

The construction prints and specifications for the repair.
Field inspection for conformance with repair specifications.
Concrete mix design and batch plant inspection.
Quality control and field testing of concrete repair.
Technical support and guidance to construction personnel on concrete repair issues.

JEC provided full time inspection and field testing during the foundation repair.

The 500 K.V. Project is unique and challenging. Site conditions and remote locations of these tower structures presented an opportunity for all those involved on the project to work as one team. The structures are found mostly in swampy areas where access required careful planning and the use of Bombardiers.

JEC continues to provide NSP with value-added services in a very responsive manner and a strong focus on quality.

 

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