GORDON H REIGSTAD
Engineering in Saint Paul, MN
License number
Massachusetts 50144
Issued Date
Nov 9, 2012
Expiration Date
Jun 30, 2018
Type
Structural Engineer
Address
Address
Saint Paul, MN 55102
Professional information
Method And Apparatus For Detecting Tendon Failures Within Prestressed Concrete
US Patent:
6119526, Sep 19, 2000
Filed:
Jul 15, 1998
Appl. No.:
9/116034
Inventors:
Gordon H. Reigstad - White Bear Lake MN
Hanley S. Reigstad - Sunburg MN
Hanley S. Reigstad - Sunburg MN
Assignee:
Tech Research, Inc. - St. Paul MN
International Classification:
G01N 300
US Classification:
73803
Abstract:
A nondestructive detection apparatus for detecting tendon failures in a prestressed concrete slab. The detection apparatus includes a cart adapted to be moved over the prestressed concrete slab. A metal sensor and a distance meter are connected to the cart. As the cart is moved over the slab, the metal sensor takes readings of a length of tendon and the distance meter measures the distance traversed by the cart. The detection apparatus also includes a controller that interfaces with the metal sensor and the distance meter. The controller is constructed and arranged to sample the readings generated by the metal sensor at predetermined distance intervals traversed by the cart.