Evaluation of Guy Anchorage Strength in Clay for Transmission Tower

    Volume 41, Issue 4 (July 2013)

    ISSN: 0090-3973

    CODEN: JTEOAD

    Published Online: 22 May 2013

    Page Count: 7


    Kongkitkul, Warat
    Assistant Professor, Dept. of Civil Engineering, Faculty of Engineering, King Mongkut's Univ. of Technology Thonburi, Bangkok,

    Srisakorn, Sorawut
    Assistant Head of Transmission Line Engineering Section, Transmission Line Maintenance Dept., Electricity Generating Authority of Thailand (EGAT),

    Chantachot, Thitapan
    Dept. of Civil Engineering, Faculty of Engineering, King Mongkut's Univ. of Technology Thonburi, Bangkok,

    Youwai, Sompote
    Assistant Professor, Dept. of Civil Engineering, Faculty of Engineering, King Mongkut's Univ. of Technology Thonburi, Bangkok,

    Jongpradist, Pornkasem
    Assistant Professor, Dept. of Civil Engineering, Faculty of Engineering, King Mongkut's Univ. of Technology Thonburi, Bangkok,

    Bunjongruksa, Chaloempon
    Civil Engineer, Naka Engineering Co., Ltd., Bangkok,

    (Received 30 June 2012; accepted 26 December 2012)

    Abstract

    Due to the growth of the economy in Thailand, the electricity transmission system must be regularly maintained so that electricity is effectively and safely distributed for uses in daily life and industries. Natural disasters often cause damage to transmission towers. In addition, some damage has occurred due to vandalisms and soil excavations near transmission towers. Foundation scouring and tilting typically occur at transmission towers. In practice, repair of damage to a transmission tower typically begins with transferring the foundation pressure of the damaged tower to other firm foundation soil using a guy fixed to a guy anchor. The transmission tower is then restored to its original condition. In this study, a series of field anchorage strength tests were performed in the Bangkok metropolitan region which is well-known for its very soft to soft clay deposits. Additionally, Kunzelstab penetration tests were performed to evaluate the undrained shear strengths of the clay with depth at the test locations. The measured ultimate anchorage strengths were then compared with values estimated theoretically on the basis of measured undrained shear strengths. The measured values were found to be approximately 70 % of the theoretical values. This was probably due to the clay disturbance caused by anchor installation. Based on this fact, the ultimate anchorage strengths were then estimated for other clay conditions.


    Paper ID: JTE20120214

    DOI: 10.1520/JTE20120214

    ASTM International is a member of CrossRef.

    Author
    Title Evaluation of Guy Anchorage Strength in Clay for Transmission Tower
    Symposium , 0000-00-00
    Committee D18