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（中冶集團(tuán)建筑研究總院 北京 100088）
【提要】 多層或低層裙房的地下室埋置深度較深，或地下車庫無地上房屋及頂板上覆土較少，當(dāng)?shù)叵滤宦癫剌^淺時，建筑地下室存在上浮問題。根據(jù)樁身軸力沿樁長的分布規(guī)律和預(yù)應(yīng)力技術(shù)分析，論證了采用拉力分散型預(yù)應(yīng)力抗拔樁抵抗水浮力的可行性，并提出拉力分散型預(yù)應(yīng)力抗拔樁的設(shè)計方法。與傳統(tǒng)的普通抗拔樁相比，在不增加工程成本前提下，作為永久性抗浮措施技術(shù)性更加合理，具有特別重要的工程實用意義。
【關(guān)鍵詞】 壓重 普通抗拔樁 拉力分散型預(yù)應(yīng)力抗拔樁 預(yù)應(yīng)力筋 非預(yù)應(yīng)力筋
Design of Prestressed Concrete Pullout Pile with Tension Dispersed/Dang Yujing（Central Research Institute of Building and Construction, MCC Group, Beijing 100088, China）Abstract:A building basement will rise when underground water table is shallow if the depth of the basement for a multiplayer or lowrise podium is deeper, or there are no surface building and overlying soil on the underground garage. The design method of a prestressed pullout pile with tension dispersed is proposed according to the distribution of the axial force of a pile along its length, and the feasibility of the antiwater float of this sort of pile is analyzed. It is more rational for the pile to be used as permanent antifloat measure as compared to a common tension pile.
Keywords:ballast; ordinary tension pile; prestressed pullout pile; tension dispersed;
 prestressed bar; nonprestressed bar