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Roadside Barrier Adjacent to Union Pacific Bridge Pier

Question
State	WI
Description Text	Attached is a preliminary layout that avoids placing concrete barrier adjacent to the existing Union Pacific bridge pier (structure B-40-327) as part of the Appleton Avenue project (USH 41) ID 2010-10-70. The draft layout shown in the attachment reflects the discussion during this afternoon’s phone conference. To summarize, MGS 3 guardrail with quarter-post spacing is provided along the face of roadway curb adjacent to and 25-feet beyond/south of the bridge pier (46-inches of working width is provided). A 12.5-foot length of MGS 3 half-post spacing is then provided followed by a thrie beam transition which is attached to single slope barrier wall. The single slope barrier wall then tapers at a 14:1 (taper rate in accordance with Roadside Design Table 5-9 for 50 MPH design speed). At the end of the barrier taper a crash cushion is shown. For the north bound direction the distances and tapers are similar. Note: Potential impacts to existing storm sewer lines and lighting conduit in the area of the proposed guardrail installations will need to be reviewed. Please provide any comments you may have regarding the proposed layout. I was wondering if we have quarter post spacing leading into a transition, if it O.K. just to run quarter post spacing throughout the whole thrie beam transition.

Question

State

Description Text

Attached is a preliminary layout that avoids placing concrete barrier adjacent to the existing Union Pacific bridge pier (structure B-40-327) as part of the Appleton Avenue project (USH 41) ID 2010-10-70. The draft layout shown in the attachment reflects the discussion during this afternoon’s phone conference. To summarize, MGS 3 guardrail with quarter-post spacing is provided along the face of roadway curb adjacent to and 25-feet beyond/south of the bridge pier (46-inches of working width is provided). A 12.5-foot length of MGS 3 half-post spacing is then provided followed by a thrie beam transition which is attached to single slope barrier wall. The single slope barrier wall then tapers at a 14:1 (taper rate in accordance with Roadside Design Table 5-9 for 50 MPH design speed). At the end of the barrier taper a crash cushion is shown. For the north bound direction the distances and tapers are similar.

Note: Potential impacts to existing storm sewer lines and lighting conduit in the area of the proposed guardrail installations will need to be reviewed.

Please provide any comments you may have regarding the proposed layout.

I was wondering if we have quarter post spacing leading into a transition, if it O.K. just to run quarter post spacing throughout the whole thrie beam transition.

System Performance Evaluation

System Types
Road Closure Gates
Thrie Beam Guardrails

Applications

System Features

Date October 3, 2013
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Attachment 2013_10_01 Appleton Avenue RR Pier Roadside Barrier.pdf

Response
Response (active)	I think that ¼-post spacing is acceptable before the ½-post spacing MGS & stiffness transition.

Date October 3, 2013
Previous Views (25) Favorites (0)