STUDY OF CONTROLLING THE HORIZONTAL BORING IN SOFT GROUND

DOI Web Site 3 References
  • ODA Keinosuke
    社団法人 土木学会 株式会社奥村組 情報システム部
  • KAJI Shigehito
    社団法人 土木学会 ジェオフロンテ研究会
  • SAKUMA Takao
    社団法人 土木学会 東興建設株式会社 東京土木支店 技術部
  • NAKAGAWA Koji
    社団法人 土木学会 山口大学工学部 臨床トンネル工学研究所

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Other Title
  • 軟弱な地盤における水平ボーリングの削孔方向制御に関する一検討

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Description

In long horizontal boring, exceeding 30m, the accuracy of drilling becomes a problem in soft ground. In the jet-mixing method, once the exact accuracy of drilling cannot be obtained, the purpose of ground improvement may be unable to be achieved. To improve the accuracy of horizontal drilling, the direction controlling method was needed. In order to correct the direction, a mechanically simple wedge system was introduced. The prediction value of the amount of corrections, and the experiment results of drilling for 60 meters were compared and discussed. As a result, it has been recognized that by selecting of a suitable wedge angle and size of the bit, the drilling direction is controllable.

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