施工技术2013年7月上 18CONSTRUCTIONTECHNOLOGY第42卷第13期 DOI;10. 7672/sgjs2013130018 可回收旋喷搅拌加劲桩锚固件设计及应用*
刘全林 （上海强劲地基工程股份有限公司，上海200235）
[摘要］在淤泥质软土地层基坑支护中，旋喷搅拌加劲桩技术能有效控制深基坑变形。
为消除锚固支护在地层中 形成障碍物的不利影响，需将加劲桩中的锚筋回收出来，为此设计了多种锚固件结构形式，通过对各种错固件的工 作机理分析，确定U形柱式锚固件具有较多的优点，该锚固件利用增大锚固件与水泥土锚固体接触面积，来分散锚 筋对锚固体的作用应力，避免了对水泥土锚固体的损伤。
确定了可回收旋喷搅拌加劲桩结构设计计算方法，基于 静载试验和工程实践，取得了良好的支护效果，并能全部回收锚筋，实现了软土地层中错筋回收技术的突破。
[关键词】地下工程；软土；深基坑；支护；加劲桩；锚固件 [中图分类号]TU753[文献标识码]A[文章编号]1002-8498(2013)13-0018-06 The Design and Application of Anchoring Parts in Cement-soil ChurningPileforRecyclableSteelStrands Liu Quanlin (Shanghai Strong Foundation Engineering Co.，Ld.，Shanghai 200235， China) Abstract:Cement-soil churning pile can control the displacement of foundation excavation effectively, especially in silt soft soil. But once steel strands in it are barred underground, the strands bee obstacle and will make trouble for later construction of buildings nearby. Therefore the design of anchoring parts to recycle the barred steel strands is necessary. Compared with the different forms of anchoring parts, U-shaped columnar ones are better. They have a larger size to release the acting force caused by steel strands， minimize the damage for both anchoring part and cement-soil material. Though the stee strands can be removed, the anchoring path is unrecyclable. This paper finally presented a theoretical method to pute cement-soil churning pile with U-shaped columnar anchoring parts and the experimental results are also listed for parison. According to the results from experiment and theoretical method, they fit well and have proved that the design of U-shape columnar anchoring parts is a break though on recyclable anchoring technology in soft soil. Key words: underground; soft soil; deep foundation excavation; supports; reinforced piles; anchoring parts 我国经济发达地区大多地处软土地区，黏土、（索）技术规程》CECS22:2005中规定普通锚杆不适 淤泥质黏土能提供给桩基或者锚杆的侧摩阻力仅用于软土基坑支护。
为10~20kPa，产生的锚固力不能满足一般软土基近年来，我国软土锚固技术发展迅速，基坑工 坑支护的要求。
由于锚杆临界锚固长度的存在，一程支护技术不断创新，旋喷搅拌加...
