变角度、高精度预应力群锚设计与施工技术

DESIGN AND CONSTRUCTION TECHNIQUE FOR HIGH-PRECISION PRESTRESSED ANCHOR GROUP WITH VARIABLE ANGLES

北京大兴国际机场指廊基坑多采用桩锚支护,其预应力锚杆对支护体系的稳定性和变形等起到重要作用.基坑施工中因地制宜合理确定了不同支护剖面的锚杆参数,确保了基坑整体安全稳定.观测结果表明,桩锚支护结构水平位移和沉降均满足设计和规范要求.

Pile-anchor support was adopted in many airside concourse foundation pits of Beijing Daxing International Airport and the prestressed anchor rod plays an important role in protecting the stability and deformation of support system. Considering different conditions in foundation pit construction, different parameters of anchor rod were determined for different support section to guarantee the overall safety and stability of the foundation pit. The observation result showed that horizontal displacement and settlement of pile-anchor support structure satisfied the design requirements and specifications.