超大索网结构建造创新技术研究——国家天文台FAST项目应用

国家天文台FAST索网结构是整个体系的支承和角度调整机构,在工作阶段一直处于变幅、不等应力水平的往复荷载作用,拉索的应力松弛、变形,疲劳都会对整个FAST结构产生影响,拉索索力重新分配并导致反射面形态发生变化,都会影响FAST整体稳定性。尤其在建成之后的数年时间内,其变化情况更为显著。因此,国家天文台项目对索网建造提出了非常高的技术要求。根据索网建造苛刻的技术标准,研发出500MPa超高应力幅拉索,并采用新工艺制造高精度拉索和节点盘。现场提出"1/5旋转对称、大跨度索网高空散拼"的施工工艺,成功完成索网安装工作

Innovative Technology Research on the Construction of Super Large Cable Net Structures - Application of the FAST Project of the National Astronomical Observatory

The FAST cable net structure of the National Astronomical Observatory is the support and angle adjustment mechanism of the whole system. It has been under the action of reciprocating loads with variable amplitude and unequal stress levels during the working phase. The stress relaxation, deformation and fatigue of the cable will affect the entire FAST structure. The redistribution of cable force and the change of Morphogenesis of the reflector will affect the overall stability of FAST. Especially in the years after completion, its changes are more significant. Therefore, the National Astronomical Observatory project has put forward very high technical requirements for cable network construction. According to the strict technical standards for cable network construction, a 500MPa ultra high stress amplitude cable has been developed, and high-precision cables and node plates have been manufactured using new processes. The construction process of "1/5 rotational symmetry, large-span cable net high-altitude loose assembly" was proposed on site, and the cable net installation work was successfully completed