The load compensation equipment for anchor cable named low retraction prestressed anchorage system with twice-tension(referred to as twice-tension anchorage system) is proposed in the paper. Calculation results of loo...The load compensation equipment for anchor cable named low retraction prestressed anchorage system with twice-tension(referred to as twice-tension anchorage system) is proposed in the paper. Calculation results of loop anchorage prestressing loss(PL) values of inner lining(IL)in Yellow River-crossing tunnel under two anchorage systems,including twice- tension anchorage system and HM(Chinese transliteration is huanmao)anchorage system,are introduced. The software ANSYS is selected to realize the three-dimensional(3D) finite element modeling to accomplish simulation and calculation works under the two anchorage systems,respectively. Stress processes of IL under the two working conditions,of which one is completed cable tensioning(CCT) and the other is water in the tunnel with the designed water pressure(DWP),are contrasted and analyzed. Impacts of prestressing forces of anchor cables on structural safety under the two anchorage systems are contrasted. The calculation results show that the twice-tension anchorage system can reduce PL effectively and then increase prestresses of wall concrete(WC). Meanwhile,the anchorage system has the advantages of improving security and stability of tunnel structure,reducing project costs and saving steel consumption. The research work is available to related design and construction of anchor cable,and is worthy of promotion and application.展开更多
应用Zig Bee传感器节点的硬件和软件以及上位机软件研制了一种无线倾角传感器网络系统。采用了二次温度补偿解决温度对测量精度的影响,并对无线网络的功耗进行了优化处理。实验表明:该系统的测量精度达到了±0.01°(倾角测量范...应用Zig Bee传感器节点的硬件和软件以及上位机软件研制了一种无线倾角传感器网络系统。采用了二次温度补偿解决温度对测量精度的影响,并对无线网络的功耗进行了优化处理。实验表明:该系统的测量精度达到了±0.01°(倾角测量范围为±3°),数据采集间隔为1次/s时,平均电流仅为0.21 m A,达到了高精度低功耗的设计要求。展开更多
基金National Natural Science Foundation of China(No.51079107)Fundamental Research Funds for the Central Universities(No.5082022)
文摘The load compensation equipment for anchor cable named low retraction prestressed anchorage system with twice-tension(referred to as twice-tension anchorage system) is proposed in the paper. Calculation results of loop anchorage prestressing loss(PL) values of inner lining(IL)in Yellow River-crossing tunnel under two anchorage systems,including twice- tension anchorage system and HM(Chinese transliteration is huanmao)anchorage system,are introduced. The software ANSYS is selected to realize the three-dimensional(3D) finite element modeling to accomplish simulation and calculation works under the two anchorage systems,respectively. Stress processes of IL under the two working conditions,of which one is completed cable tensioning(CCT) and the other is water in the tunnel with the designed water pressure(DWP),are contrasted and analyzed. Impacts of prestressing forces of anchor cables on structural safety under the two anchorage systems are contrasted. The calculation results show that the twice-tension anchorage system can reduce PL effectively and then increase prestresses of wall concrete(WC). Meanwhile,the anchorage system has the advantages of improving security and stability of tunnel structure,reducing project costs and saving steel consumption. The research work is available to related design and construction of anchor cable,and is worthy of promotion and application.
文摘应用Zig Bee传感器节点的硬件和软件以及上位机软件研制了一种无线倾角传感器网络系统。采用了二次温度补偿解决温度对测量精度的影响,并对无线网络的功耗进行了优化处理。实验表明:该系统的测量精度达到了±0.01°(倾角测量范围为±3°),数据采集间隔为1次/s时,平均电流仅为0.21 m A,达到了高精度低功耗的设计要求。
