小口徑短距離泥水壓平衡式微型掘進機推力分析

使用微型掘進機鋪設地下管道的技術已經被廣泛運用。在使用推管工法安裝管道的過程中，最重要的一點就是控制在推進過程中所產生的推進力。精準地預測推力大小是推進過程中結構安全的保證，可以防止推進管的損壞以及控制對周圍土層和建物的擾動。各國學者通過對推進過程中產生的各種阻力進行分析，提出了許多推力預測公式。而這些公式進行實務運用是否合適，需要結合各地的現場實測數據進行分析。本研究中找到的相關文獻多數著眼長距離、大管徑的工程。而台灣舊都會區的巷道狹窄曲折，因此推進距離都比較短，所使用的推進管尺寸也比較小。本研究通過對新北市中和區一個標段的四個推進段落數據的分析，驗證這些公式在台灣使用的可靠性。在現場數據收集的過程中，也同時對營造廠所用的微型掘進機（RASA DH-FsT400型）以及其他現場設備和推進過程進行了詳細的了解和記錄。中和地區新店溪沿岸多為卵礫石層，在這樣的地層所收集到的數據可以看出，在推進的過程中周圍的覆土不會保持穩定，周圍的土體都會對管身產生摩擦力。Terzaghi所提出的筒倉模型計算出的正向應力用於計算摩擦阻力與實測數值所分析得到的摩擦力可以很好匹配。

關鍵字

推管工法；微型掘進機；推力預測

並列摘要

Using micro-tunnel-boring machine (MTBM) in the trenchless operation has been widely used in the underground pipeline construction. To prevent damage of pushing pipe and neighboring construction, most important point in the jacking process is controlling the thrust force. Formulae for predicting jacking force have been proposed for decades. Whether these formulae are suitable for project, data collected from the worksite needs to be evaluated and analyzed. Most literature is focusing on projects with pipes of long distance and large diameter. Streets in developed urban area in Taiwan are narrow and zigzag, which is different from the most cases mentioned in the literature. Distance is short and excavation diameter is small are the feature of the Taiwan pipeline construction project. This research focused on data collected from few jacking sections in a project which located in Jhonghe district, New Taipei city, Taiwan. The research verified the suitability of the predicting formulae in Taiwan. In the process of collecting data in the worksite, the condition of MTBM (RASA DH-FsT400), the condition of worksite equipment and work details in the working process were recorded as well. The soil layer in Jhonghe district is rich in pebble gravel. From data collected from the worksite, following conclusions can be drawn. -Excavation face is not stable, the soil in the crown will collapse in the jacking process. The collapse of excavation hole develops huge frictional force. -Terzaghi’s silo model is well applied in the calculating frictional force.

並列關鍵字

Pipe jacking ； MTBM ； Jacking force prediction

參考文獻

6 褚炳麟（Chu）, 潘進明(Pan), 張國雄(Chang) (1996), 台灣西部卵爍石層現地之大地工程性質地工技術, 1996, 第55期

1 D.N. Chapman & Y. Ichioka (1999) Prediction of Jacking Forces for Microtunnelling Operations, Trenchless Technol. Res., Vol. 14, No. 1, pp. 31-41, 1999

2 A.-L. Pellet-Beaucour & R. Kastner (2002) Experimental and Analytical Study of Friction Forces During Microtunneling Operations, Tunnelling and Underground Space Technology 17 2002. 83-97

3 Saeid Khazaei & Hideki Shimada & Kikuo Matsui (2004) Analysis and Prediction of Thrust In Using Slurry Pipe Jacking Method, Unknown Dairy

4 K. Shou & J. Yen & M. Liu (2010) On the frictional property of lubricants and its impact on jacking force and soil–pipe interaction of pipe-jacking, Tunnelling and Underground Space Technology 25 (2010) 469–477

國際替代計量

小口徑短距離泥水壓平衡式微型掘進機推力分析

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