Hi Everyone,
I am pulling my hair out with this issue I am having...
I need to do a cut/fill analysis not residential site and this site has like 6 retaining walls there is a 6 foot difference in grade.
My surface is not recognizing the grade change when I make the polyline into a wall breakline.
I know I am doing something wrong here but I just cannot figure it out. Please help thank you
To more accurately show a wall in a suface, I need two breaklines, One for the top of the wall grade, and one for the bottom of the wall grade. I typically use a 0.5' offset to separate the breaklines. A single polyline cannot do the job.
Or am I missing something...
Thanks for the response, I have been using one line and drawing 2 breaklines off that one line.
Ok do I connect the polylines in anyway?
I typically don't connect them. Here's a sample of a recent wall in a surface we used on a project. Note the separation of the top and bottom breaklines. The black section between them is 15 vertical feet of contours stacked nearly on top of each other.
See attached for an example of a feature line retaining wall. The offset used here is computed from the block's batter angle for the maximum wall height. On larger walls you will want to account for batter in tight designs.
John Mayo
hi fellas! newbie question here. lets say I have my two feature lines one for top of wall and the other as bottom of wall that has an elevation assigned to each vertices, how do I add it up to my surface? As a standard or wall? Do I have to create a separate surface for my walls and have to paste it to my proposed surface so that it will reflect correctly on my surface? thanks in advance!
I usually don't include the actual wall in the proposed surface. I have a Featureline for the groundline at the back of the wall and one for in front of the wall. Then I mask the area of the wall. I don't show contours going through the wall. If I want the wall in a surface to show in 3D then I paste it in to a proposed surface.
BTW. You'll want a Featureline for the back top of the wall also. You can create that by offsetting the top front.
Allen Jessup
Engineering Specialist / CAD Manager
A designer should note and determine if they need to compute what the wall width will be in plan view. This will of course depend on materials and the wall's batter but a 6' high boulder wall could have a plan view width of 4-5' if you are using 3' diameter stone. A Keystone wall could have a 2-3' plan view width. This width may be very important if you are placing the wall close to building setbacks, property lines, structures or designing a serpentine driveway with limited distance between the parallel runs of the driveway. If the wall is placed on a property line and the wall has batter the designer should make sure that the embedded portion wall is not going to be on the neighbors lot.
John Mayo
I still use two feature lines separated by a small number, like 0.125', to depict the front face of the wall. For wall width, if significant like johnm's example, I'd take the top feature line and offset it by the wall width to show the top of the wall. I do this with curb lines all the time, and only do this with walls of top widths of 5-10' wide, like gabion walls and such.
@Anonymous wrote:the designer should make sure that the embedded portion wall is not going to be on the neighbors lot.
That's hanging over my head right now. I'm supposed to be completing acquisition maps. But the retaining walls haven't been designed yet. So what we'll need to include the footings is just a guess at this point.
It's good you brought these issues up. I was just addressing the use of Featurelines in wall design and surface creation. There's always much more to the story!
Allen Jessup
Allen Jessup
Engineering Specialist / CAD Manager
HTH. This of course will not matter if the wall is not constrained by surrounding stuctures or parcel boundaries.
Here's a nice example of feature line retaining walls built into the surface for the OP. There are 4 or 5 here. It shows the top inside walll face as CColes discussed.
John Mayo
Wow! They're re-grading the Partenon
Well now we all now know your not Greek... or an architect 🙂
That was for a lake front log cabin addition. 😮
John Mayo
Hi
Plaese if it is possible,could you please share the DWG file of this example?
I appreciate you in advance,because it is very useful for me
Sincerely
Sorry I took so long to respond. I was away for a few days.
I had to remove data from this file and place the basics for these walls into the NCS template.
There are two methods to building walls here.
Wall 1 - Feature lines extracted from a corridor. I like the profile control and profile superimposition to to display the wall with this method. I use this most when the contractor bids by wall face area and when a profile is needed to spec anchoring and/or grid systems.
Wall 2. Drafted Feature Lines - Draw them as you need in plan. Assign elevations and add the feature lines to a surface. I use this most often for smaller (<6') boulder walls and landscape walls.
These same methods can be used to construct many other things like curbs, buildings, ponds, swales, etc.
The 2.6 MB file is too large to post here. 😞
Send me an email and I will deliver. Sorry I don't do dropbox or stuff like that.
johnm at conklinassociiates dot com
John Mayo