calculation sterro dig per house (autocad? )

[ragnol]

Good morning, I usually do all kinds of jobs and so I have no topographic software, but a friend asked me to make the pre and post excavation relief foundations of his house to verify the volume of sterro.

I managed to generate the cad file with 3d points of the front and post excavation relief, and I put them on two different layers. to have the points of the common perimeter, the external and remaining unchanged points are present in both layers (and are obviously coincident).

I tried to use dtm commands and prism / prismodiff, but it creates 4000 3d faces and prism / prismodiff give me error.

Is there any soul that, without becoming mad, could you tell me the volume of sterro?

I attach the file cad. thanks so far if someone can help me. . .

 

[lattu]

Are all the points right? There are some that I think are wrong, highlighted in the attached file and in the screen

 

[ragnol]

Meanwhile, thank you for your concern. I'll check if I was wrong to import a few points and tell you.

 

[ragnol]

I attach the controlled file. I eliminated a 3d point corresponding above a wall. the other two points are just as indicated.
Would you be able to give me the volume?

Thanks again

 

[Tristan]

apart from the layers of pre and post excavation points, the other layers what they represent? do you need or can I ignore them?

 

[ragnol]

You can ignore them. are layers that created the user iattu (see above).

 

[lattu]

986.2699 mc
attach the file with the resulting solid

 

[ragnol]

Very kind. now I try to make a calculation "spanciometric" to see if they are congruous.

Anyway thanks again

 

[GP.]

it is not that it changes much, but since some points of the excavation are higher than the current soil - moving earth can happen - to me they turn out 957 mc of land removed.

 

[ragnol]

How come different results? :unsures:

is it not that the software you use also allows you to have a print (pdf?) of the calculation of volumes? I guess it's a lot of voices, but if you could tie it to me... if I do not ask the moon, you have already been very kind so...

 

[lattu]

I used a simple combination of 3d profiles and loft command, getting surfaces that I then joined forming a solid. It is not a true calculation of sterro but simply reading the volume of the solid obtained.
for technical requirements I did not use all points inserted, so the calculation of gp could be more accurate

 

[ragnol]

but did you do the job with autocad? because the only autocad commands I had found were dtm and prism / prismodiff, but as you can read above I couldn't get the result... :

 

[Tristan]

executed with autodesk civil 3d both for comparison of surfaces and to stranded sections. I got a result comparable to that of gp (see pfd attached)

 

[ragnol]

Thank you, you were very kind

 

[GP.]

but did you do the job with autocad? because the only autocad commands I had found were dtm and prism / prismodiff, but as you can read above I couldn't get the result... :

procedure with autocad:
- creates a dtm with the points of the current soil;
- create a dtm with excavation points;
- for each dtm turns the 3dfaces into surfaces (convinsuperf) and then join them (union) in order to find the two distinct surfaces of "before" and "after";
- Extrude surfaces down 10 or 15 meters you find yourself 2 solids;- pull them on a floor horizontal horizontal whatever, just below the digging quota and common to the two dtms:
- the difference in volume between the two solids corresponds to the removed soil.

in the dwg that I attached I kept the objects created with the various steps described above.
so it seems long, but it takes two minutes.
@tristan considering the decimals, the difference between the two solids I posted is 956.70, I would say that our results coincide.

 

[lattu]

but did you do the job with autocad? because the only autocad commands I had found were dtm and prism / prismodiff, but as you can read above I couldn't get the result... :

Yes, with autocad, without using dtm commands that I did not know
indeed I have verified and in my autocad the dtm command does not even exist, perhaps it is on civilization?

 

[ragnol]

Tonight I try your gp system, thank you very much too!

 

[Tristus]

a calculation of the excavation volumes that is sufficiently precise can also be done with autocad.
But certainly autocad is not the best for this kind of work.

 

[Tristus]

I tried to load the lisp called dtm and I selected the internal points to the ground and those along the borders. the result I get is a myriad of 3d faces that overlap. practically the same drawback highlighted by ragnol in the first post.
It's like autocad makes more triangulations than the same points. If I had to combine faces into one surface, the result would not be correct. the triangulation placed by gp instead is the correct one. Is it possible that my dtm doesn't work properly? What dtm utility are you doing?

 

[GP.]

I used a topography program that "gira" in autocad (civildesign), of free highly recommend this to create dtm:https://www.cad3d.it/forum1/threads/creazione-terreno-3d.40771/#post-334472