Alignment Problem getting tangent violations

[Anonymous]

Hello Everyone,
I am using Civil3D 2018 and trying to create an alignment with a tight radius in it. I keep getting tangent violations at 3 points. How can I correct this?

[Jeew-m · Accepted solution]

Dear Friend,

You can use floating curve to achieve this target.

This video might help.

https://www.youtube.com/watch?v=-CZR3qxpIXo

Thanks

[Anonymous]

Thanks the video was very helpful and I was able to create the alignment without any tangent violations.

Thank you,

Newman Starke

[Anonymous]

@Jeew-m can u please make a video with spiral in and spiral out

iam keep getting tangent violation i need help with that

[Jeew-m]

Could you please post a drawing with your requirement. That would make me more concentrated.

[Anonymous]

@Jeew-m

iam using 2018 version

i have curve radius less than 2000 m with in Right of way (ROW) to freeze the alignment so i have to use spiral in and spiral out for both tangents for curve fixing

iam using Indian standards as per IRC

[Jeew-m]

See this video if it helps.

I don't know the standard IRC values for spirals. I just put random value for video.

Similarly you can try with other spiral options in geometry editor when creating spirals.

https://youtu.be/h3Q_lKrm37c

Thanks

[Anonymous]

@Jeew-m Thanks for your  video i am able to fix the curve with spiral in and out

I am trying to fix the reverse curve can you please help me out here.

can you please find the circle portion in the attachment 

[Jeew-m]

This looks bit tricky. 

What I suggest is this.

Create arcs over those curves and delete them.

Now create new curves with same radius using fix curve option. But do not connect them to the tangents or do not connect the curves with each other. Make them separate.

Then use free spirals to connect the curves to tangent ends.

Use reverse spirals to connect between two curves.

[Anonymous]

Can u please make a small video i can understand easily.

i will try in your way

i found the other alternate way to fix this curve if we reduce speed.this curve fitting will be done.

but i want to maintain same speed 100km/hr