土工基础

土工基础 ›› 2021, Vol. 35 ›› Issue (4): 421-424.

• 工程实录 •    下一篇

PHC管桩在天津淤泥质软土中的应用

张 启1,2，王天宝1,2，胡海江1,2   

  1. (1.北京城建勘测设计研究院有限责任公司，北京 100101；2.城市轨道交通深基坑岩土工程北京市重点实验室，北京 100101)
  • 收稿日期:2020-05-28 修回日期:2020-06-02 出版日期:2021-08-31 发布日期:2021-08-19
  • 作者简介:张 启（1991-），男，硕士，工程师，研究方向为岩土工程设计与施工。

Application of PHC Pipe Piles in Tianjin Soft Mucky Soil

ZHANG Qi1,2, WANG Tianbao1,2, HU Haijiang1,2   

  1. (1.Beijing Urban Exploration & Surveying Design Institute Co. Ltd., Beijing 100101;2.Beijing Key Laboratory of Geotechnical Engineering for Deep Excavation of Urban Rail Transit, Beijing 100101)
  • Received:2020-05-28 Revised:2020-06-02 Online:2021-08-31 Published:2021-08-19

摘要： 预应力管桩的主筋选用高强度、低松弛的螺纹钢筋，强度高，抗弯、抗裂性能强；选用高强度混凝土，单桩承载力高；桩身防腐性能好，设计选用范围广，适应多种地层；施工周期短，绿色文明施工好。以PHC管桩在天津典型淤泥质软土工程为例，选定合理的桩型、桩长，考虑管桩的土塞效应，通过设计验算，单桩竖向承载力特征值满足设计要求。结合单桩竖向载荷试验和桩身完整性检测试验结果，单桩承载力和桩身完整性均满足设计要求，表明PHC管桩在软土中具有一定的应用价值。

关键词: PHC管桩, 淤泥质软土, 土塞效应, 承载力

Abstract: The main reinforcing bars of a pre-stressed high performance concrete pipe pile (PHC) are made of high-strength and low-relaxation steel bars, which have a high strength, good bending properties and cracking resistance. The concrete strength of the pile is high, and the structural capacity of a single pile is also high. The pile has a good corrosion resistant performance, so that it has a wide range of design and selection, suitable for a various of soils. This type of pile has the advantages of short construction period, and environmentally friendly. This paper presents an application of the PHC pipe pile in the soft mucky silty soft soil in Tianjin. Approaches of selecting appropriate pile type and length are provided. The soil plug effect of the pipe pile on the axial pile resistance is also considered in the pile. The static pile loading tests and the integrity testing have confirmed that the PHC installation was satisfactory.

Key words: PHC Pipe Pile, Mucky Soft Soil, Soil Plugging Effect, Axial Capacity

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