摘要
拉力型预应力锚索通常采用全段式注浆法,此方法容易导致锚索自由段长度缩短,从而引起锚索张拉伸长量不足,无法满足锚索验收标准的要求。为解决锚索自由段过短的问题,通过理论计算、现场试验等方法,分析了锚索自由段长度对支护桩内力、锚索内力的影响。结果表明,锚索自由段的缩短会增大锚索的支锚刚度和内力,改变支挡结构的受力,降低相邻锚索的内力。结合工程案例,提出了一种针对锚索张拉伸长量不足的处理措施,即通过公式反算锚索自由段长度及支护桩和相邻锚索的内力,并通过多次补张拉,调节相邻锚索的施工参数,使锚索和支护桩的内力处于设计要求范围内,从而避免了锚索的重新施工,降低工程损失,缩短返工工期。
The tension-type prestressed anchor cable usually adopts the full-section grouting method.This method can easily lead to the shortening of anchor cable free section length,resulting in insufficient tensile elongation of the anchor cable,which cannot meet the requirements of the acceptance standard of anchor cable.In order to solve the problem that the free section of anchor cable is too short,the influence of anchor cable free section length on the supporting pile internal force and the anchor cable internal force were analyzed by means of theoretical calculation and field test.The results show that the shortening of anchor cable free section would increase the anchor stiffness and internal force of anchor cable,change the force of the retaining structure,and reduce the adjacent anchor cable internal force.Combined with the engineering case,a treatment measure for the insufficient tensile elongation of anchor cable was proposed.That is,anchor cable free section length and the internal force of the supporting pile and adjacent anchor cable were inverse calculated by the formula,and the construction parameters of adjacent anchor cable were adjusted by multiple complement tensions.The internal forces of anchor cable and supporting pile are within the design requirements,thus avoiding the re-construction of anchor cable,reducing the project loss and shortening the rework period.
作者
张强
任孟良
毛宗原
隗伟
刘欢
李徐
ZHANG Qiang;REN Mengliang;MAO Zongyuan;KUI Wei;LIU Huan;LI Xu(China Building Technique Group Co.,Ltd.,Beijing 100013,China;Beiing Jingtou Yintai Shangde Real Estate Co.,Ltd.,Being 102200,China)
出处
《建筑结构》
北大核心
2025年第24期160-165,共6页
Building Structure
关键词
拉力型预应力锚索
锚索自由段
张拉伸长量
支锚刚度
锚索内力
tension-type prestressed anchor cable
free section of anchor cable
tensile elongation
anchor stiffness
anchor cable internal force
