Method for installing overhead transmission line supports on permafrost soils

  • US 10,100,486 B2
  • Filed: 08/02/2016
  • Issued: 10/16/2018
  • Est. Priority Date: 03/28/2014
  • Status: Active Grant
First Claim
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1. A method of installation of a power transmission tower on permafrost soil, comprising:

  • driving a casing pipe into soil to a depth greater than a level of seasonal freezing and thawing of soils for transferring horizontal loads from the power transmission tower to surrounding soil;

    inserting a pile into the casing pipe, including driving the pile;

    while inserting and driving the pile, installing rigid elements in pairs on a shaft of the pile by welding at predetermined locations for installation of the rigid elements, wherein said installing includes for each pair of the rigid elements;

    measuring gaps in between a top of the casing pipe and the pile at a lower end of each predetermined location;

    manufacturing each pair of rigid elements comprising a pair of generally flat plates fitting in the gaps, based on the measuring;

    welding each pair of rigid elements on opposite sides of and transverse to the shaft at each predetermined location in a vertical plane, positioned to transfer horizontal force from the pile to the casing pipe; and

    repeating the installing and manufacturing for each of the pairs of rigid elements during the pile insertion and driving.

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