L连廊式楼梯平面图

Quick answer：

A 'corridor-style staircase plan' is a technical drawing that illustrates the design and layout of a staircase within a building, specifically one that is surrounded by corridors or open spaces on both sides. This type of staircase is often found in buildings where space is limited or to provide a more open feel. The plan typically shows the dimensions, construction details, and connections to other parts of the building.