The reserved shaft on the construction drawing has no door.

There is no door in the reserved shaft on the construction drawing paper, so it is necessary to ask the person in charge of construction to ensure the construction safety, and there are potential safety hazards in the house.

Construction drawing refers to the general layout of the project, the appearance, internal layout, structural structure, internal and external decoration, material practices, equipment and construction requirements of buildings and structures. Construction drawings can be divided into building construction drawings, structural construction drawings and hydropower construction drawings. The construction drawing is mainly composed of drawing frame, plane elevation, detail drawing, compass, legend, scale and other parts. The drawing method of construction drawing in China has become mature.