The invention discloses a method for drawing a foundation pit excavation drawing. The method comprises the following steps: step 1, according to a basic plane drawing of a building, applying building
information model software to establishment of a foundation pit
mass model, and enabling the foundation pit
mass model to be consistent with the design dimension proportion in the basic plane drawing; step 2, laying off on the foundation pit
mass model according to the
building construction drawing, and forming an excavation model; step 3, applying the
software to creation of a two-dimensional foundation pit excavation drawing according to the excavation model; step 4, based on the two-dimensional foundation pit excavation drawing, carrying out foundation pit excavation, and meanwhile, utilizing the three-dimensional foundation pit mass model to assist understanding and review. The method, disclosed by the invention, can effectively solve the problem that the excavation drawing is difficult to draw because when a large-scale foundation pit is excavated, the location and lay-out is complicated; compared with the regular drawing method for the excavation drawing, the method can greatly reduce drawing
workload and drawing time to shorten the
work period; compared with the regular excavation drawing, in the exported excavation drawing, size marking is realized via the
software automatically, so that the phenomena of marking missing and mis-marking can be greatly reduced, and the drawing is high in accuracy.