Digging Deep with Revit Cut and Fills
Though not really designed for Civil work (road layout and drainage etc), Revit does allow the user to generate terrain (topography) from scratch, imported DWGs or DXF files, or even by importing a CSV points file. Most Revit users know how to do this, but what many don't know is that Revit can calculate the cut and fill volumes from an original terrain with that of a developed site.
This helps the user to determine the costs of landscape modification during site development.
Revit Structure reports the values by making a comparison between a surface from one phase and, from a later phase, another surface whose boundary lies within the earlier surface. For example, Revit Structure can compare a topo surface created in one Phase to that of a topo surface created in a different Phase that lies within the boundary of the surface from the first Phase.
When you select the later surface and click Properties, you see the following instance properties:
- The Cut value is the volume removed (where the later surface is lower than the earlier surface).
- The Fill value is the volume added (where the later surface is higher than the earlier surface).
- Net Cut/Fill value comes from subtracting the cut value from the fill value
To begin the process, first create the existing terrain, then select the surface and within its Element Properties, set the Phase Created to Existing.
Note: You can create as many Phases within a project as you wish.
Next make a copy of the terrain to the same coordinates / location. I simply create a couple of reference planes in the site view and use this as a reference point. The copy of the terrain will have the Phase: New Construction. I like to also set the Material for the second terrain surface to a different colour, so that I can easily distinguish between the two surfaces.
Edit the second terrain as required e.g. altering point heights, or adding / deleting them to develop the earth works.
By selecting each topo surface, you can apply a Name to it via it's Element Properties - this makes reading and understanding the schedule table easier.
Next create a schedule in the usual manner, but selecting Topography as the Category. Add in the desired fields i.e. Name, Surface Area, Cut, Fill etc.
I also like to override the graphics for on of the surfaces in any section that I create - again this allows you to see the difference betwwen the two surface.
Finally place your views and schedule onto your plot sheet and voila! Sau khi thực hiện san phẳng bề mặt địa hình thi công, chúng ta cần có bảng và hình như hình dưới.
Graded Surfaces Thực hiện san bề mặt
If you add a building pad to a graded surface, you will see cut and fill reported separately for the pad and the toposurface in a topography schedule. This is because the pad divides the graded surface into 2 surfaces: one is the surface under the pad (the graded surface), and one is the surface that is not under the pad (the pad surface).
You should name both the graded surface and the pad surface in order to distinguish them in your schedule.
To create a graded region, you select a toposurface to modify. The surface should be an existing surface in the current phase. Revit Structure marks the original surface as demolished and makes a copy with a matching boundary. Revit Structure marks the copy as new in the current phase.
Yup this process also works with terrains built in different Revit files. Just link the Revit files together and then make sure that you select the Included elements in linked files within the Schedule Tables Properties. Để tạo được bảng thống kê, ra lệnh View -> Schedule.Chọn Toposurface và thêm các tham số như hình dưới.