50 most error-prone details of construction drawings, please check carefully!

The loss of control of the project cost is often caused by the change of the construction stage and the visa, so the proofreading and optimization work should be done as much as possible before the construction drawing is drawn, only in this way can the error rate be minimized, and today I will share with you 50 construction drawing proofreading methods.

First, the general plan

1. Whether the absolute elevation at 0.000 is marked.

2. Whether the axis and total size of the outer contour are indicated.

3. Whether the number of floors is indicated.

4. Whether the relationship with the main road and the red line is expressed.

5. Whether roads and greening are arranged.

6. Whether the economic and technical indicators are listed: total land area, total construction area, number of parking spaces (the office building group should write this item), building density, floor area ratio, greening rate (35%-50% is required, and the green space area should be adjusted if it is not done).

7. A circular fire lane is set around the building, with a width greater than or equal to 4 meters and a chamfer radius of 12 meters at the turn.

8. Line type: a thick line (outside) and a thin line represent the outline of the building, if there are different local floors, use a thin line to represent the projection line, and do not draw a projection in the stairwell of the local protruding roof.

2. Floor plan

The rooms on each floor do not need to be furnished, but the bathrooms should be furnished

9. Is the grid of each layer consistent? The number of the grid network of the previous floor should be consistent with the number of the grid of the next floor, because the column is aligned from top to bottom, and the column network of each layer should be the same, unless the top layer has the situation of drawing columns.

10. Is the floor floor elevation marked?Is the floor of the outer corridor, porch, bathroom, toilet, boiling water room, disinfection room and other rooms with water lower than the ground of the corresponding floor by 0.01~0.03m?

11. Are the three dimension lines equally spaced (100~70mm), and are the annotated texts unified font and character height?

12. Are the doors and windows numbered, and are the doors numbered differently according to the size of the opening, the opening method and the structure?

13. Is the outer skin of the column flush with the outer skin of the aisle? After decoration, the column should generally not be seen from the aisle, so as to ensure the evacuation width of the aisle.

14. Is the opening direction of the evacuation door open in the direction of the flow of people, and when the width of the door opening exceeds 1.2m, is it opened according to the width of each door of 0.6~0.9m (especially at the gate)?

15. Is there a running direction mark in the stairwell?The first floor runs halfway, the middle floor runs halfway, the next half runs, and the top floor runs twice. Is there an elevation of the intermediate landing, and are the stair dimensions fully represented on the floor plan and section plan?

16. Whether there is a scattered water expression on the floor plan, the elevation of the outdoor floor, whether there are steps or ramps at the entrances and exits, and whether the ramp slope is indicated, whether the profile character expresses the correct section position and direction, please carefully compare the projection with the section drawing. Is there a north arrow on the floor plan to indicate the orientation of the house?

17. Is the text of the room name the same font and height?

18. Is there a floor drain on the ground of the toilet and other rooms with water, is there an expression of the slope of the ground, does the toilet sanitary equipment meet the requirements of the number of users, and whether the separation size is marked?

19. The minimum door opening width of public buildings is 1m, and the width of the door with large use area and large number of users and large equipment entering and exiting should be designed according to the requirements of the code, and the door should also be opened separately.

20. The plane of each floor should have the floor elevation and the rest platform elevation. Canopy elevation.

21. Whether the name of the room is expressed.

22. Whether the cut wall line is thickened and whether the column is filled.

3. Roof plan

23. Is the axis line to be positioned by the component labeled, and is the axis line without the positioning component eliminated?

24. The roof elevation is generally marked with the elevation of the structural layer, is it marked?

25. Is the rainwater pipe distributed in the middle of the drainage partition or the shady corner of the house?Does the spacing of the rainwater pipe meet the requirements of the practical spacing?(18~24m)

26. Is the plane projection of the cornice consistent with the cornice in the section drawing?

27. Does the rainwater pipe pass through the outer corridor? If it does, the water pipe should be installed along the wall instead of laying the rainwater pipe on the side of the railing.

28. At least one stairwell should be on the roof, is the staircase projection of the staircase on the roof expressed? The threshold should be 300 times higher than the roof to block water, and the threshold projection is expressed?

29. Is the floor plan of the elevator machine room expressed?

30. Is there a floor plan of the partial roof (upper roof, staircase roof, elevator roof)?

31. Does the gutter have an elevation, and the drainage slope in the gutter is 1%?

32. Does it express the slope and direction of drainage, waterline, and lattice seam?

Fourth, the elevation drawing

33. Is the size and elevation complete?

34. Does the canopy indicate?

35. Does it represent the façade material?

36. Is the stairwell and elevator room out of the roof indicated?

37. Is the outer contour and floor line thickened?

5. Sectional view

38. Is it cut to the staircase and reflects the internal changes of the main building space?

39. The wall line cut in the section drawing is thickened, and the floor slab (generally set to 100mm thickness), staircase and beam are blackened.

40. Is the outdoor floor, indoor ground, floor floor, and roof elevation marked?

41. Is the relationship between the floor line and the wall cut to the wall correct? First there is an outdoor floor line, build the wall, and then backfill the indoor ground, so the wall will disconnect the indoor and outdoor horizons, as shown in the figure, is yours correct?

42. Is it correspondingly with the floor plan if the projection is carefully compared with the floor plan?

43. Does it mean a gutter?

44. Is the name of the dissected room written?

45. Is the size of the staircase refined?

6. Detailed drawings

46. Whether the specification indicates the detail index and detail number, the index symbol should be represented in the corresponding plane, or elevation, or section, and the size of the symbol should meet the requirements of the drawing specification.

47. The filling legend that is cut. (Differs from section view)

48. Is the positioning axis marked?

49. Is the elevation size complete?

50. Whether it corresponds to the flat, vertical and sectional, especially the detailed drawing of the cornice that must be drawn, must correspond to the roof plane and decoration table.

7. Precautions before drawing

1. Is the size and font size appropriate and uniform?

2. Does the positioning axis number of each figure correspond?

3. Is the line type correct?

4. Is each drawing drawn according to the scale?

5. Whether the layout sequence is correct: architectural plan: general plan, floor plan, roof plan, elevation, section. Construction drawings: general description of design, general drawing, floor plan, roof plan, elevation, section. Door and window tables, decoration tables, and detailed drawings can be arranged more flexibly, and the layout is reasonable.

6. Adopt a unified picture frame.