Rectification of Tilted Transmission Tower Using Micropile Underpinning Method
Publication: Journal of Performance of Constructed Facilities
Volume 34, Issue 1
Abstract
The purpose of this paper was to report a rectification method that was used for plumbing a tilted transmission tower supported by a shallow foundation over a soft clay layer. The restoration method involves the installation of the grouted micropiles at the perimeter of the foundation. Hydraulic jacks resting on the top of micropiles and steel brackets attached to the existing foundation were used to lift the tilted transmission tower. The micropile construction processes, as well as the rectification data, are reported and analyzed in this study. The outcomes of the rectification case history highlight the effectiveness of the postgrouting technique for the micropile, because it was able to increase the axial compressive bearing capacity of the micropile almost 2.5 times compared with the nongrouted steel-pipe micropile, based on the pilot pile load test results. The increase in compressive bearing capacity of the micropile was crucial to guarantee the safety and serviceability requirements of the rectified transmission tower.
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Acknowledgments
This work was supported by the National Natural Science Foundation of China (No. 51478165) and the fundamental research funds for the central universities of China (No. 2017B12114).
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Published In
Journal of Performance of Constructed Facilities
Volume 34 • Issue 1 • February 2020
Copyright
©2019 American Society of Civil Engineers.
History
Received: Oct 9, 2018
Accepted: Jul 23, 2019
Published online: Dec 11, 2019
Published in print: Feb 1, 2020
Discussion open until: May 11, 2020
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