When using the construction drawing to draw the as-built drawing, the modification basis must be marked; When the construction drawing has major changes in structure, technology and layout, or the changed part exceeds 1/3 of the drawing, the as-built drawing shall be redrawn and stamped with the as-built stamp before it is qualified.
Extended data:
As-built drawing is a drawing drawn by the construction unit according to the actual construction situation when it is completed, because it is inevitable to be modified during the construction process, in order to let customers (construction units or users) have a clearer understanding of civil engineering.
In housing construction, electrical installation, water supply and drainage projects, the actual direction of pipelines and the actual installation of other equipment, the state stipulates that the construction unit must submit the as-built drawings after the project is completed.
Construction completion drawing is the feedback of design information. Different from design drawings, they can reflect the engineering entity most truly, accurately and systematically. They are just like the instructions of industrial products, and the use, maintenance and management of products are inseparable from them. Because there are many hidden parts in building engineering, it can't be like some mechanical instruments.
If there are any problems in the use process, you can show them to technicians, or you can take them apart for inspection and maintenance, which is often impossible for construction projects. To solve these problems, you must rely on as-built drawings and as-built materials. Therefore, in the scientific management of construction projects and underground facilities, as-built drawings are very important.