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Bluetop Intervals  

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joshselvey
Posts: 4
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(@joshselvey)
FNG
Joined: 5 months ago

Hello survey world. I have a question about the interval to use when staking bluetops for roadway construction. I work in the public sector and would like to know what the "norm" is for AB and subgrade intervals. I've always thought that 50' for subgrade and 25' for AB is the normal intervals but my supervisor would like to get a little feedback on this from the community. So any help will be greatly appreciated.

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Erik Myers
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(@erik-myers)
Joined: 3 years ago

FNG
Posts: 4

Hey Josh,

Welcome aboard. 50 and 25 foot intervals seems to be the norm, here in Phoenix. Unless there is a vertical curve, something that has minimal fall or if there is the dreaded Bidwell. I tend to give extra in these cases.

Cya around.

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joshselvey
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(@joshselvey)
Joined: 5 months ago

FNG
Posts: 4

Thanks Erik. I had always done it that way before coming into the public sector. Along with all vertical changes. Hope you're doing well.

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FrozenNorth
Posts: 440
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(@frozennorth)
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eddycreek
Posts: 873
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500+ posts
Joined: 9 years ago

We always used 50' on highway work, unless there was something non-typical going on.  Now its every .01' with machine control.  If the operator has to go more than 10' without something on the screen he starts hollerin' about needing grade.

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Zapper
Posts: 511
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(@zapper)
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Joined: 7 years ago

Fwiw, for bluetops we used to go every 50' on tangents, 25' on curves, and did all PCs, PTs, APs, VPCs and VPTs. This was about 17 years ago.

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joshselvey
Posts: 4
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(@joshselvey)
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Joined: 5 months ago

Thanks for the input. I will pass it along to my supervisor.

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