立管焊接双板出厂前是什么样子的：D12立焊接双板从正面看是两个直角五边焊接于垂直道的两侧。表面处理一般用红色防锈漆。立焊接双板的制作标准见于西北电力设计1983年颁布的《汽水道支吊架设计手册》，是常见的道吊架之一。D12型立焊接双板的型号有：D12.159S，D12.168S，D12.194S，D12.219S，D12.245S，D12.273S，D12.298S，D12.325S，D12.355S，D12.377S，D12.406S，D12.426S，D12.457S，海东立管焊接双板，D12.480S，D12.508S，D12.530S，D12.558S，D12.630S，D12.720S，D12.820S。