Light pole mounted on traffic barrier 2

[tmalik3156]

Good day all.

Precast traffic barriers will be installed on the bridge deck in a rehabilitation project.
One option is to mount the light poles directly on top of the barrier. An example is shown in the google photo below. The barrier may be TL2 or TL3.

Can someone please direct me to reinforcement details drawings for this type of modified barrier? Any DOT standard drawings would be good.

Also notice in the photo that there are a lot of vertical cracks on the barrier. Does anyone have experience with this type of light mounting barriers? Do they perform satisfactorily?

 

[BridgeSmith]

I haven't seen it done, and I suspect the reason is that the pole may present a hazard to vehicle occupants that is deemed unacceptable in many circumstances. Even if it is allowed, it may require special detailing (i.e. breakaway base or designed hinge point) to meet the safety requirements for a pole within the clear recovery zone (which it obviously would be, regardless of the roadway design speed).

That said, given the impact forces a TL-2 or TL-3 barrier would have to accommodate, I can't see the moments on the barrier from a light pole producing anything close to a critical loading case for the normal reinforcing in the barrier, so long as the anchorage for the pole base is embedded adequately.

 

[LittleInch]

I suspect that pole simply goes into the barrier and the base step out is just cladding/ protection. Might even be impact absorbing material.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[bridgebuster]

See attached; we do this all the time. I've never seen a barrier without hairline cracks, though yours look more significant.

 

[FacEngrPE]

https://maps.app.goo.gl/nHDd47xt5Sf4jHtcA

I95 near I495 springfield Va.

I can't find drawings for this on VDOT's website.
You could try FWHA's standard drawing list

https://highways.dot.gov/federal-lands/std-drawings/state

.

Ohio has a relevant detail, Attached. Mostly this extends the anchor bolts into the jersey Barrier foundation.

 

[LittleWheels]

Most of those barriers/ poles look to be cast in situ while the OP refers to mounting poles to precast barriers. The difference is likely to have some effect on the design.

 

[BridgeSmith]

If the plan is to mount them on precast barriers, the type, size, and position of the anchor bolts would have to coordinated with the precaster. It may not be possible, depending on the configuration of the forms the precaster uses, such as if the barrier sections are cast upside down, which seems likely, based on what I've seen of the finished product (smooth on the top; rough on the bottom).

 

[triops1996]

FDOT Standard Plan 715-002 may have details you need

 

[bridgebuster]

BridgeSmith - we did precast on a job. The precaster called before he started the shop drawings; a few tweaks here and there; things went well.

 

[FacEngrPE]

In Virginia most of the highway barriers are cast in place by slipform.

When constructing the slip form profile occasionally the profile has gaps for structures requiring cast in place - like storm drains.

Most of the prefab jersey wall used here is barricades that are either short (no economics to slipforming) or temporary (construction barricades, etc) which need to be moved over their expected life.