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機場捷運高壓噴射灌漿地盤改良-以山鼻車站(A10)為例 Jumbo Jet Grouting for TIAA MRT Foundation Improvement - Shanbi Station (A10)
基礎地質改良,水泥漿澆置。

機場捷運CEO2 施工標山鼻站(A10)基礎設計型式為擴展式基礎,由於基礎下之地質軟弱,恐有受水浮力及土壤液化現象產生,導致基礎下陷,進而影響結構體安全之疑慮,經設計檢討採高壓噴射灌漿 JSG 工法施作地盤改良予以防止。改良範圍以山鼻站柱位共計4處(25支/處)配置改良,而本工程之施作完成後,除有前述效果外並能增加土壤摩擦力,可有效提供結構承載,防止載重過量或不均勻,致壓密沉陷之狀況發生。
超高壓噴射改良樁之施作,係利用前端裝設有超硬噴嘴及空氣噴嘴之鑽桿,鑽孔至土層預定改良深度後,使帶著空氣之超高壓硬化材在地盤內迴轉,將地盤切削並利用空氣上升作用把軟泥排出地面,同時將欲改良之土層區域形成土壤與水泥漿強制混合之固體。
高壓噴射灌漿工法之優點為處理深度可隨意調整,地盤內軟硬土層參差不齊,可依實際需要改良之範圍施灌硬化材,以達預定深度土壤改良之效果;同時改良後之土壤強度及截水性甚佳、無公害、無噪音,所用之硬化劑主要為水泥類,在硬化後不溶解於水,故不污染地下水,在施工時亦不發生振動及噪音,為地盤改良之優良選項之一。

The foundation design of TIAA MRT Shanbi Station (A10), CE02 Tender, adopted the extended foundation. Due to soft geological conditions that may cause water buoyancy and soil liquefaction, leading to subsidence and further affecting the safety of structures, the high-pressure JSG (Jumbo Jet Special Grouting) method was applied to improve the foundation and prevent such problems. The improvement scope included 4 sites (25 piles per site) in Shanbi Station. After the completion of this construction, it is estimated to present the abovementioned effects and also increase soil friction. The improvement could effectively provide the structural resistance to prevent overloading or uneven load that may result in consolidation subsidence situation.
The construction of JSG piles used a drill pipe equipped with a super-hard nozzle and air nozzle at the front end to drill into the soil to a predetermined depth so the high pressure hardening material will rotate within the foundation along with the surrounding air. The rotations will cut the foundation and air convection will lift the slime out of the ground. At the same time, the soil will be transformed into a solid form that is forcibly mixed by soil and cement slurry.
The advantage of high-pressure JSG method is flexible depth handling which can apply hardening materials according to the actual improvement scope in uneven soil layers so as to achieve the desired depth of soil improvement effect. The soil improved by this method has excellent soil strength and water-intercept ability, public hazard-free and noise hazard-free. The hardeners used are mainly cement which will not dissolve in water after hardening, so will not pollute the groundwater. Utilizing this kind of material also prevents vibration and noise during construction so that the method is one of the excellent options for foundation improvement.

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