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■■■■■■■■■■■■■■■■■■■ 川崎製鉄技報 KAWASAKI STEEL GIHO Vol.20 (1988) No.1 ■■■■■■■■■■■■■■■■■■■ |
| 埋設鋼管用長距離推進工法の開発 Development of Long Span Pipe Jacking Method for Laying Underground Pipe 赤秀 公造(Kohzo Akahide) 藤本 智也(Tomoya Fujimoto) 永野 栄二(Eiji Nagano) 佐々木 寛(Hiroshi Sasaki) 竹内 卓(Takashi Takeuchi) 土井 初冶(Hatsuji Doi) |
| 要旨 : （株）小松製作所が保有するアイアンモール工法を基本に，推進力の増強，排土機能の強化，方向計測システムの改良などを加え，外径500mmの鋼管を供試して直進200mmの長距離推進施工実験を行い，敷設に成功した。得られた主な結果は以下のとおりである。(1)直進200mmの長距離推進施工を完遂した。(2)3種類の供試鋼管の座屈耐力を検証，推進に供したが，いずれの鋼管も円滑に施工できた。(3)本管の推進力算定手法を明かにするとともに，最大推進力とその発生位置を求める簡易式を提案した。(4)推進精度は上下左右方向ともに±40mmの範囲を確保した。 |
| Synopsis : When it is difficult to use the conventional open-cut method for laying pipe underground, a pipe jacking method is often utilized. In such a case, a longer span is more desirable for actual construction because of the potential cost saving, construction efficiency, minimization of traffic interruption, and other resultant advantages. This paper discusses an improved technique which was implemented by using Komatsu Iron Mole as a basis and by adding thereto several features such as the pipe laying technique utilizing incremental jacking force, reinforced slurry discharge function, improved direction control devices, etc., in a full-scale field test for a distance of a 200-m span employing 500-mm-diameter pipe. The principal results obtained were the following : (1) Long span pipe jacking method was successfully used for a distance of a 200-m straight line. (2) Three types of pipe, namely, double walled pipe, expanded pipe and bare pipe which previously sustained buckling forces were all advanced smoothly through the soil. (3) A procedure for evaluating the main pipe jacking force was confirmed, and brief equations to estimate the maximum jacking force and its probable location were proposed．(4) High precision jacking at an accuracy of ±40mm deviation in horizontal as well as vertical directions was achieved. |
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