The elevators and distributional stairs take up the middle section of the structural grid, made of stone tiles with steel elevators.
电梯与疏散楼梯占据结构网络的中央区域，网络采用石板建构，设有钢制电梯。
Take welding from middle to both ends step by step may have the least deformation, or take welding from one section to another step by step may also reduce the deformation.
从中间向两端逐步退焊法变形最小，采用逐段跳焊法也可以减少变形。
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