Temporary Barrier Systems

Florida Department of Transportation

TEMPORARY BARRIER SYSTEMS

FDOT Contacts:

District ConstructionMarshall [email protected]

Earl [email protected]

2 TEMPORARY BARRIERS

Steel

Precast Concrete

Low Profile

Water Filled

Guardrail

5 Types

TEMPORARY BARRIERS

Test VehiclesNCHRP (National Cooperative Highway Research Program) 350: 820C and 2000PMASH (Manual On Assessing Safety Hardware): 1100C and 2270P

Includes Passenger Cars Of All Sizes, Sport/Utility Vehicles, Mini-Vans, Vans and Pick-up Trucks

NCHRP 350 = 820C (1800 lb.) Passenger Car @ 20 deg.MASH = 1100C (2420 lb.) @ 25 deg.

NCHRP 350 = 2000P (4400 lb.) Pickup Truck @ 25 deg. MASH = 2270P (5000 lb.) @ 25 deg.

TL-2 tested at 70 km/h (44 mph)

TL-3 tested at 100 km/h (62 mph)

3

4 PRECAST CONCRETE

JJ Hook

415 Type KTemporary Barriers

3 TypesPrecast

ConcreteTemporary

Barriers

5 INDEX 415 BARRIER WALL

Temporary Barriers

415

Temporary Barriers

Index 415 units constructed prior to October 1, 2002 may be used until September 30, 2012

THROUGH JUNE 30, 2012 LETTING with usage of ‘FDOT Snake Pin’ Interconnection

6 INDEX 415 - JJ HOOK

Temporary Barriers

Temporary Barriers

JJ HookTemporary

Barriers

See QPL for vendor drawings

7 INDEX 415 AND JJ HOOK

•Free Standing

Installation

•Rigid Pavement (Concrete)

•Flexible Pavement (Asphalt)

•Cross Slope of 1 to 10 or flatter

Surface

•Required Between Other Types of Barriers

Transitions

•Varies on Use, Location and Speed

DeflectionDistance

• Required Between Other Types of Barriers


Transitions



Transitions


• Free StandingInstallation

• Rigid Pavement (Concrete)• Flexible Pavement (Asphalt)• Cross Slope of 1 to 10 or flatter

Surface

• Required Between Other Types of BarriersTransitions

• Varies on Use, Location and SpeedDeflectionDistance


Deflection Distance

See Index 415 Sheet 1


Installation Work Zone Speed Offset to Travel-way

Right Shoulder

45 mph or Less

50 mph and Greater

DeflectionSpace

Shielding

1’ min.2’ preferred2’ min.4’ preferred

Traffic Side

AboveGroundHazards

1’ min.2’ preferred

45 mph or Less

Drop-OffHazards 50 mph and Greater


a. Drop-Off 4’ or less and No Traffic below

a. All Drop-off conditions other than “a”

2’ min.

4’ min.

2’ min.

2’ min.

4’ min.


Installation Work Zone Speed Offset to Travel-way

SeparatingTraffic

45 mph or Less

50 mph and Greater

DeflectionSpace

Shielding


AdjacentOpposing

Traffic


Traffic Side Traffic Side

15 INDEX 414 – TYPE K

Temporary Barriers

Temporary Barriers

Temporary Barriers

Type K

Only Type K barrier is approved for use on bridges

12’-6” Segment Length

16 TYPE K

• Bolted• Staked • Free Standing• Backfilled

Installation


Surface

• Required Between Type K Freestanding, Bolted, Staked and Back Filled


• Varies on Type of Installation (above), Use, Location and Speed

DeflectionDistance

TYPE K



17

18 TYPE K

• Bolted• Staked • Free Standing• Backfilled

Installation


Surface



• Varies on Type of Installation (above), Use, Location and Speed

DeflectionDistance

19 TYPE K

Deflection Distance

•See Index 414 - Sheet 5Bolted

•See Index 414 - Sheet 6Staked

•See Index 414 -Sheet 6 & 7Free Standing

•See Index 414 - Sheet 7Back Filled

TYPE K

• See Index 414 - Sheet 5Bolted

20

TYPE K

• See Index 414 - Sheet 6Staked

21

TYPE K

• See Index 414 -Sheet 6 Free StandingRoadway

22

TYPE K

• See Index 414 -Sheet 6Free StandingBridge

23

TYPE K

• See Index 414 -Sheet 7Free StandingRoadway Median

24

BARRIER SYSTEM PLACEMENT

JJ Hook

415 Type K

3 TypesPrecast

ConcreteTemporary

Barriers

25

BARRIER TERMS

Work Area

Approach End – The portion of a barrier system exposed to approaching traffic.

26

BARRIER TERMS

Work Area

Trailing End – Downstream end of a barrier system, not exposed to approaching Traffic.

27

BARRIER TERMS

Work Area

Unidirectional – Exposed to traffic approaching from one direction only.

28

BARRIER TERMS

Work Area

Bidirectional – Exposed to traffic approaching from opposing directions

29

BARRIER TERMS

Work Area

Point of Departure - A point on the edge of a lane at which an errant vehicle leaving the lane will likely impact

the leading face of a hazard or area of concern.

30

BARRIER TERMS

Work Area

Departure Line - A line extending from the Point of Departure to the back of a hazard or Clear Zone

31

BARRIER TERMS

Work Area

Departure Rate - The rate at which the Departure Line leaves the roadway and extends to the back of a hazard or CZ.

1:16 or 1:131:16 or 1:13

1:16 for speeds 45 mph or less1:13 for speeds 50 mph or greater

32

BARRIER TERMS

Work Area

Work Area INSIDE Clear Zone Limit use the Back of Hazard or Back of Work Area Inside Clear Zone

Clear Zone Limit

33

BARRIER TERMS

Work Area extends OUTSIDE Clear Zone Limit use the Clear Zone Limit Distance

Clear Zone LimitWork Area

34

BARRIER TERMS

Work Area

Beginning Length of Need- The point at which a barrier intersects the Departure Line establishes the Beginning of

the Length of Need

35

BARRIER TERMS

Work Area

Length of Advancement (X) – The distance a longitudinal barrier must be extended in advance of an area of concern in order to adequately shield the hazard.

36

X

D

d

X

Example for 45 mph with CZ of 18’ withbarrier set at 2’ from Edge of Travel Wayand Work Area extends 20’ from Edge of Travel Way

X = 16 (18-2)X = 256’

BARRIER TERMS( L E N GT H O F A DVA N C E M E N T )

37

BARRIER TERMS

Work Area

Length Of Need Unidirectional – Barrier needed is from the approach departure line to the trailing departure line.

Length of Barrier System Needed

38

BARRIER TERMS

Work Area

Length Of Need Bidirectional – Barrier needed is from the approach departure line to the trailing departure line

Length of Barrier Wall Needed

39

40 LOW PROFILE BARRIER

Intended for use in Urban Areas where sight distance for side streets and driveways may be a problem.


• Design Speeds of 45 mph or lessApplication

• Cross Slope of 1 to 10 or flatterSurface

• Along the run of barrier:• Tubular Markers• 50’ cc Tangent; 25’ cc radii

• Approach end:• Type 1 Object Marker

Supplemental Devices

• Deflection Distance - 9 inch min• Approach End Offset – 6 foot min

DeflectionDistance & Offset


• Deflection Distance - 9 inch min• Approach End Offset – 6 foot min

DeflectionDistance &

Offset

LOW PROFILE BARRIER43

LOW PROFILE BARRIER44

PORTABLE TEMP LOW PROFILE BARRIER DESIGN STANDARD 412

4 Systems: Triton

Guardian

Yodock

Sentry

45 WATER FILLED BARRIERS

See QPL

WATER FILLED BARRIERS46

47 TEMPORARY GUARDRAIL

Same Requirements as Permanent Guardrail

1. Pay Item #102-73, LF Includes End Anchorage.

2. Unless stated otherwise in the plans, temporary guardrail is the property of the contractor.

STEEL BARRIERS

4 Systems: Barrier Guard

Orion

Vulcan

Zone Guard

48

STEEL BARRIERS

• Bolted (Rigid Pavement)• Anchored (Flexible Pavement)Installation


Surface


• Varies on Type of Installation (above), Location, Speed, and Manufacture

DeflectionDistance

49

STEEL BARRIERS50

PAY ITEMS51

Steel Barrier is alternate design to Type K Barrier!

QUESTIONS ????????????????

Temporary Barrier Systems

Documents

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