make sure the pumping project that concrete should be symmetrically pumped into the two lower chord members before into the two upper chord members.
确定了先同时对称泵送两根下弦管混凝土,再对称泵送两根上弦管混凝土的泵送方案。
the ceiling system should satisfy these requirements that using lower chord ball as fixed point, adapting space change of hyperboloid steel grid, grid settlement under snow load.
a double member open web overhead pedestrian bridge supported by lower chord member has been built in guiyang.
一座双肢空腹下承式人行天桥已在贵阳市延安西路建成使用。
most queries and dynamic adjustment will occur within the lower chord network, which reduce the cost of query and the churn aroused by the adding and department of the nodes.