旋挖擴(kuò)底灌注樁在軟土地基工程應(yīng)用中的經(jīng)濟(jì)性分析
李峰，徐壯濤，鄭振鵬
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（上海市城市建設(shè)設(shè)計(jì)研究總院， 上海 200125）
［摘要］以中國(guó)2010年上海世界博覽會(huì)B片區(qū)地下空間工程為依托，對(duì)旋挖擴(kuò)底灌注樁和兩種樁徑的鉆孔灌注樁、后注漿灌注樁共五種布樁方案的造價(jià)進(jìn)行了對(duì)比分析，從而對(duì)旋挖擴(kuò)底灌注樁在軟土地基工程應(yīng)用中的經(jīng)濟(jì)性作出了評(píng)價(jià)。研究結(jié)果表明，旋挖擴(kuò)底灌注樁相對(duì)于鉆孔灌注樁，能有效提高單樁的抗壓與抗拔承載力，可以有效減少總樁數(shù)，施工工期短，總造價(jià)最低，比較適用于采用逆作法施工的軟土地基地下空間工程。［關(guān)鍵詞］旋挖擴(kuò)底灌注樁; 經(jīng)濟(jì)性分析; 軟土地基; 工程應(yīng)用; 地下空間中圖分類號(hào)：TU473 文獻(xiàn)標(biāo)識(shí)碼：A 文章編號(hào)：1002-848X(2016)08-0061-04
Cost analysis of the engineering application of screw-drilled under-reamed cast-in-situ piles in soft groundLi Feng, Xu Zhuangtao, Zheng Zhenpeng(Shanghai Urban Construction Design & Research Institute, Shanghai 200125, China)Abstract: Based on underground space project of B area of Expo 2010 Shanghai, the comparative analysis of costs of five pile arrangement schemes was compared and analyzed, including one screw-drilled under-reamed cast-in-situ pile, two cast-in-situ shaft piles with different pile diameters and two base-grouted bored piles with different pile diameters, in order to evaluate the cost of screw-drilled under-reamed cast-in-situ pile in engineering application of soft ground. As shown in the results, the screw-drilled under-reamed cast-in-situ pile has higher compressive bearing capacity and uplift bearing capacity than the cast-in-situ shaft pile. The screw-drilled under-reamed cast-in-situ scheme needs less piles, shorter construction period and lower cost, so such type of pile is suitable for underground space projects in soft ground which are built by top-down construction method.Keywords: screw-drilled under-reamed cast-in-situ pile; cost analysis; soft ground; engineering application; underground space
作者簡(jiǎn)介：李峰，博士，高級(jí)工程師，Email: adrianqiao@163.com。
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