旧楼梯与新平台接合

提示词

依据已确认改造剖面表现原楼梯与新增平台的接合，保留旧梯段和栏杆范围，用可读轮廓区分新旧，不臆造隐蔽连接。

Use the confirmed retrofit section to show an existing stair meeting a new landing, retaining the recorded flights and railings and distinguishing old and new outlines without inventing concealed connections.