Oregon Standard Drawings - Guardrail and Metal Median Barrier (29" Rail Height)

Sep 17, 2026

Uploaded by Blaney

Engineering standard drawing package detailing guardrail and metal median barrier construction. Includes notes on rail element types (W-beam and Thrie beam), rail height measurements from final paved surface, post and bolt/nut arrangement, splice bolt hardware, drainage curb alignment, and lap direction relative to adjacent traffic. Provides installation and adjustment guidance for initial installation and future adjustment, including alternate procedures at bridge ends and materials compatibility requirements per Oregon Standard Specifications.

LanguageEnglish

CategoryResearch & Report

FormatPDF

Pages54

Reading Time2 h 16 min

AccessFree to download

NOTES

INITIAL INSTALLATION

ASSEMBLY DETAILS (RELATION OF PARTS)

TABLE OF POST SPACING

NORMAL RAIL ELEMENT DATA

GENERAL NOTES FOR ALL DETAILS ON THIS SHEET

CHANNEL RAIL AND SPLICE PLATE METAL MEDIAN BARRIER/SHOULDER GUARDRAIL INSTALLATION AT BRIDGE DECK EXPANSION JOINT

Adjacent traffic flowRailelement(W beam shown,Thrie beam similar)Toenail with # NOTES: 1.Rail height measured from final paved surface at face of rail to top of rail(Typ.all types). 2.Final paved surfacing to extend to face of post. Edge of block or postSplice bolt &nutBack of post(8 per splice)(4 per end splice) 3.Drainage curb alignment same as face of guardrail. WasherPost bolt &nutRailmembers(At ②each post) # INITIAL INSTALLATION 1-16d galvanized(Steel or wood)flat head nail each sidethrough top of blockBlock (Used onTypes 2A,3&4) INITIAL INSTALLATION 2"top of block to top of post 3"top of block 20-JUL-2020 ASSEMBLY DETAILS to top of post (RELATION OF PARTS) # NOTES: 1.When required by the plans,post bolts to extend beyondthe tightened nuts within limits of4"to Y2". TABLE OF POST SPACING ALTERNATE 2.When steel posts are used see "APPURTENANCES"formodified bolt detail,Std.Dwg.RD415. 1 TYPE 4 3 2A INITIAL INSTALLATION 6'-3" 3'-1Y₂" 12'-6" 6'-3" SPACING FUTURE ADJUSTMENT 3.All post bolt threads to be set after assembly for wrenchremoval only. OR FUTURE ADJUSTMENT NORMAL RAIL ELEMENT DATA TYPE 1 Rail TYPES 2A&3 GUARDRAIL Type Thkn.* Effective Lengths RAIL AFTER OVERLAY GUARDRAIL FITTINGS 0.105”&0.135" 1,2A,3 6.25',12.5',25' W beam (Adjust as shown) (See general note 2) 0.105”&0.135" Thrie beam 4 6.25',12.5',25' (Use restricted to (For Type 3 use double thickness(2)rail elements) TYPE 4 GUARDRAIL non-roadway applications) *Base metal thkn.nom.(Before galv.) RD400.dgn | NOTE:
Clearance to be 1%6"at rail splice for bridge expansion joints. | | --- | | NOTE:
Median barrier post spacing 6'-3".
See end construction for variations. | | --- | 1.See appropriate guardrail standard | CHANNEL RAIL AND SPLICE PLATE
METAL MEDIAN BARRIER
(METAL MEDIAN BARRIER) | | | | | | --- | --- | --- | --- | --- | | Deck expansion joint
3"(Splice bolts)
3"(Splice bolts)
Expansion end of bridge span
fixed end of bridge span
Rail splice-
Channel rail member with expansion slots-
Extend toward bridge deck expansion joint-
4 Symmetrical about
Post
Extension-
Extension-
Block
Variable
Extg.post and
of slot
Rail splice ①②
of slot
splice bolt slot
Corr.rail member with expansion`slots
Extg.splice bolt slot-
Norm.post spacing 6'-3"
Norm.post spacing 6'-3"
CHANNEL RAIL AND
CORRUGATED RAIL
SPLICE PLATE
NOTES:
Rail expansion
①Place 2-Y32"polytetrafluoroethylene (TFE)sheets between
PLAN
corrugated rail members.The sheets shall be 12Z"×1'-7".
②Adiust nuts to provide a sliding fit and set threads to prevent loosening.
METAL MEDIAN BARRIER/SHOULDER GUARDRAIL INSTALLATION AT BRIDGE DECK EXPANSION JOINT | GENERAL NOTES FOR ALL DETAILS ON THIS
SHEET: | | | | | | drawing(s)for details not shown.
2.Use "Alternate Initial Installation",at
bridge ends (See Std.Dwg.RD440),
adjacent to P.C.C.pvmt.for temporary
guardrail,to match existing guardrail,
for Type 1 rail or as directed.
3.See Std.Dwg.RD701 for drainage curbs,
where required.
4.Lap guardrail in direction of adjacentt
traffic. | The selection and use of this
Standard Drawing,while
designed in accordance with
generally accepted engineering
principles and practices,is the
sole responsibility of the user
and should not be used without
first consulting a Registered
Professional Engineer. | | All materials shall be in accordance with
the current Oregon Standard Specifications. | | | | | | OREGON STANDARD DRAWINGS
GUARDRAIL AND
METAL MEDIAN BARRIER
(29"RAIL HEIGHT)
2024 | | | | | | DATE
REVISION DESCRIPTION | | | | | | | | | | | | CALC.
BSAE_
RD4

FAQs

How is rail height measured for these details?

Rail height is measured from the final paved surface at the face of the rail (typical all types). A 1" ± tolerance note is also provided.

What governs post bolts and future adjustment of threaded portions?

Post bolt threads must be set after assembly for wrench removal only. When required by the plans, post bolts extend beyond tightened nuts within stated limits, and threads should be adjusted to prevent loosening.

How should guardrail materials and drainage alignment be handled?

All materials must comply with current Oregon Standard Specifications. Drainage curb alignment is specified to match the face of the guardrail when required by the plans.

Sep 17, 2026

Uploaded by Blaney