617.2 Construction Inspection Guidelines for Sec 617 - Revision history

Kleins1: Clarifying NCHRP 350 is the latest approved crash test for Type F three-loop concrete barrier.

2022-12-01T20:19:47Z

Clarifying NCHRP 350 is the latest approved crash test for Type F three-loop concrete barrier.

← Older revision		Revision as of 15:19, 1 December 2022
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	'''[[:category:617 Traffic Barrier#617.1 Temporary Concrete Traffic Barrier\|Temporary Concrete Traffic Barrier]] (for [http://www.modot.org/business/standards_and_specs/SpecbookEPG.pdf#page=9 Sec 617.20])'''		'''[[:category:617 Traffic Barrier#617.1 Temporary Concrete Traffic Barrier\|Temporary Concrete Traffic Barrier]] (for [http://www.modot.org/business/standards_and_specs/SpecbookEPG.pdf#page=9 Sec 617.20])'''

	[https://www.modot.org/media/16894 Type F barrier] with three loops is the latest crash-tested temporary barrier. The Type F barrier shall be used on all projects when a temporary barrier is specified.		[https://www.modot.org/media/16894 Type F barrier] with three loops is the latest crash-tested (NCHRP 350 tested) temporary barrier. The Type F barrier shall be used on all projects when a temporary barrier is specified.

	'''Certification (for Sec 617.20.3)''' The inspector needs to collect certifications on Type F temporary concrete traffic barrier. The date of manufacture is stamped on the barrier. The date needs to be checked to verify certification.		'''Certification (for Sec 617.20.3)''' The inspector needs to collect certifications on Type F temporary concrete traffic barrier. The date of manufacture is stamped on the barrier. The date needs to be checked to verify certification.

Smithk: Per DE and TS, guidance now reflects that the use of non-MASH 2016 temporary traffic control devices barriers is being discontinued. All temporary traffic control devices on a project must be NCHRP 350 or MASH 2016 Test Level 3 compliant. The use of two-loop temporary Type F concrete traffic barrier shall not be allowed after January 1, 2023.

2022-04-19T15:34:50Z

Per DE and TS, guidance now reflects that the use of non-MASH 2016 temporary traffic control devices barriers is being discontinued. All temporary traffic control devices on a project must be NCHRP 350 or MASH 2016 Test Level 3 compliant. The use of two-loop temporary Type F concrete traffic barrier shall not be allowed after January 1, 2023.

← Older revision		Revision as of 10:34, 19 April 2022
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	It is the contractor’s responsibility to maintain the barrier in acceptable condition. The inspector must notify the contractor of any unacceptable pieces and ensure they are replaced in a reasonable fashion.		It is the contractor’s responsibility to maintain the barrier in acceptable condition. The inspector must notify the contractor of any unacceptable pieces and ensure they are replaced in a reasonable fashion.

	~~The two-loop Type F barrier uses a connection rod with an keeper pin assembly consisting, of a retainer bolt and nut and washer, to connect the sections.~~		There are two variations of Type F barrier: two-loop version and the three-loop design. The use of two-loop Type F barrier shall be discontinued January 1, 2023.

	There are two variations of Type F barrier ~~that currently are allowed, the older~~ two-loop version and the ~~newer~~ three-loop design.
	{\|style="padding: 0.3em; margin-left:5px; border:2px solid #a9a9a9; text-align:center; font-size: 95%; background:#f5f5f5" width="445px" align="right"		{\|style="padding: 0.3em; margin-left:5px; border:2px solid #a9a9a9; text-align:center; font-size: 95%; background:#f5f5f5" width="445px" align="right"
	\|-		\|-
	!colspan="2"\|'''~~2- and~~ 3-Loop Type F Barrier Connections'''		!colspan="2"\|'''3-Loop Type F Barrier Connections'''
	\|-		\|-
	\|[[image:617.2 3 Loop Proper 1.jpg\|200px]]\|\|[[image:617.2 3 Loop Proper 2.jpg\|200px]]		\|[[image:617.2 3 Loop Proper 1.jpg\|200px]]\|\|[[image:617.2 3 Loop Proper 2.jpg\|200px]]
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	\|colspan="2"\|'''Improper Connection:''' One 3-loop Type F barrier was turned 180 degrees and the two ends have four loops on top and two loops on the bottom. Care must be taken when installing barrier for proper loop connections.		\|colspan="2"\|'''Improper Connection:''' One 3-loop Type F barrier was turned 180 degrees and the two ends have four loops on top and two loops on the bottom. Care must be taken when installing barrier for proper loop connections.
	\|-
	~~\|colspan="2" align="center"\|[[image:617.2 2 Loop.jpg\|200px]]~~
	\|-
	~~\|colspan="2"\|When installing two 2-loop barriers or one 3-loop barrier and one 2-loop barrier, the connection rod shall have a bottom washer and retainer bolt and nut.~~
	\|-
	~~\|[[image:617.2 Proper.jpg\|200px]]\|\|[[image:617.2 Improper.jpg\|200px]]~~
	\|-
	~~\|'''Proper Connection:''' The bottom washer with retainer bolt and nut. \|\|'''Improper Connection:''' No washer or retainer bolt.~~
	\|}		\|}
	'''For Sec 617.20.4.2''' Two-loop barrier that is manufactured before January 2004 may be used on a project. Any two-loop barrier manufactured after January 2004 must be rejected. Acceptance of two-loop barrier may be based on certification provided by the contractor stating that the barrier was fabricated prior to January 1, 2004 and in accordance with MoDOT specifications in effect at the time of fabrication. A legible MoDOT acceptance stamp on individual segments of barrier as required by the specifications may be waived if certification, as stated above, is provided by the contractor.		'''For Sec 617.20.4.2''' The three-loop barrier uses a connection rod with an optional keeper pin assembly consisting, of a retainer bolt and nut and washer, to connect the sections. The use of the retainer bolt and nut and bottom washer is at the contractor’s option.

	The three-loop barrier uses a connection rod with an optional keeper pin assembly consisting, of a retainer bolt and nut and washer, to connect the sections. The use of the retainer bolt and nut and bottom washer is at the contractor’s option.

	Two-loop and three-loop barrier may be used in combination. The contractor must use the connection rod and keeper pin assembly, consisting of the retainer bolt and nut and washer, if the two temporary barrier types are used in combination. Refer to the box, "2- and 3-Loop Type F Barrier Connections", to the right.

	All exposed Type F barrier ends are to be protected with an approved end treatment. This may include a barrier flare, barrier height transition or crash cushion. Type F height transitions are not to be used where the posted speed prior to construction is greater than 35 mph.		All exposed Type F barrier ends are to be protected with an approved end treatment. This may include a barrier flare, barrier height transition or crash cushion. Type F height transitions are not to be used where the posted speed prior to construction is greater than 35 mph.
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	If a contractor is interested in anchoring overlapping sections of barrier, contact Construction and Materials for details.		If a contractor is interested in anchoring overlapping sections of barrier, contact Construction and Materials for details.

	It is imperative that the Type F barrier be connected together as designed or properly anchored or overlapped when individual barrier sections cannot be properly pinned together. Anything less will not meet NCHRP 350 ~~and may make MoDOT liable if the barrier is hit~~.		It is imperative that the Type F barrier be connected together as designed or properly anchored or overlapped when individual barrier sections cannot be properly pinned together. Anything less will not meet NCHRP 350 or MASH 2016.

	'''For Sec 617.20.4.4''' Equipment or material shall not be stored near temporary barriers within the limits shown on the plans or as approved by the engineer.		'''For Sec 617.20.4.4''' Equipment or material shall not be stored near temporary barriers within the limits shown on the plans or as approved by the engineer.

Smithk at 14:15, 29 December 2021

2021-12-29T14:15:14Z

← Older revision		Revision as of 09:15, 29 December 2021
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	'''For Sec 617.20.4.5''' Type F barrier may be anchored to the pavement and bridges as shown on the plans. The barrier is to be anchored on bridges when lateral deflection cannot be tolerated. The method of anchoring on bridge decks will be determined by Bridge and will be shown on the bridge plans.		'''For Sec 617.20.4.5''' Type F barrier may be anchored to the pavement and bridges as shown on the plans. The barrier is to be anchored on bridges when lateral deflection cannot be tolerated. The method of anchoring on bridge decks will be determined by Bridge and will be shown on the bridge plans.
	~~[[image:617 Concrete Traffic Barrier.jpg\|right\|125px]]~~

	'''Concrete Traffic Barrier Delineators (for [http://www.modot.org/business/standards_and_specs/SpecbookEPG.pdf#page=9 Sec 617.30])'''.		'''Concrete Traffic Barrier Delineators (for [http://www.modot.org/business/standards_and_specs/SpecbookEPG.pdf#page=9 Sec 617.30])'''.

Smithk: updated link

2020-02-13T18:39:08Z

updated link

← Older revision		Revision as of 13:39, 13 February 2020
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	'''[[:category:617 Traffic Barrier#617.1 Temporary Concrete Traffic Barrier\|Temporary Concrete Traffic Barrier]] (for [http://www.modot.org/business/standards_and_specs/SpecbookEPG.pdf#page=9 Sec 617.20])'''		'''[[:category:617 Traffic Barrier#617.1 Temporary Concrete Traffic Barrier\|Temporary Concrete Traffic Barrier]] (for [http://www.modot.org/business/standards_and_specs/SpecbookEPG.pdf#page=9 Sec 617.20])'''

	[~~http~~://www.modot.~~mo.gov/business/standards_and_specs~~/~~documents~~/~~61720.pdf~~ Type F barrier] with three loops is the latest crash-tested temporary barrier. The Type F barrier shall be used on all projects when a temporary barrier is specified.		[https://www.modot.org/media/16894 Type F barrier] with three loops is the latest crash-tested temporary barrier. The Type F barrier shall be used on all projects when a temporary barrier is specified.

	'''Certification (for Sec 617.20.3)''' The inspector needs to collect certifications on Type F temporary concrete traffic barrier. The date of manufacture is stamped on the barrier. The date needs to be checked to verify certification.		'''Certification (for Sec 617.20.3)''' The inspector needs to collect certifications on Type F temporary concrete traffic barrier. The date of manufacture is stamped on the barrier. The date needs to be checked to verify certification.

Smithk at 12:55, 2 July 2019

2019-07-02T12:55:10Z

← Older revision		Revision as of 07:55, 2 July 2019
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	[[image:617.2 Permanent Concrete Traffic Barrier.jpg\|right\|425px\|thumb\|<center>'''[~~http~~://www.modot.~~mo.gov/business/standards_and_specs~~/~~documents~~/~~61710.pdf~~ Type C] Permanent Concrete Traffic Barrier'''</center>]]		[[image:617.2 Permanent Concrete Traffic Barrier.jpg\|right\|425px\|thumb\|<center>'''[https://www.modot.org/media/16893 Type C] Permanent Concrete Traffic Barrier'''</center>]]
	'''Permanent Concrete Traffic Barrier (for [http://www.modot.org/business/standards_and_specs/SpecbookEPG.pdf#page=9 Sec 617.10])''' The several different types of permanent concrete traffic barrier are:		'''Permanent Concrete Traffic Barrier (for [http://www.modot.org/business/standards_and_specs/SpecbookEPG.pdf#page=9 Sec 617.10])''' The several different types of permanent concrete traffic barrier are:

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	* Type B (MSE wall) – is a modified Type B used on MSE walls.		* Type B (MSE wall) – is a modified Type B used on MSE walls.

	* [~~http~~://www.modot.~~mo.gov/business/standards_and_specs~~/~~documents~~/~~61710.pdf~~ Type C] – is a two-sided single slope barrier.		* [https://www.modot.org/media/16893 Type C] – is a two-sided single slope barrier.

	* Type D – is a single-sided version of the Type C.		* Type D – is a single-sided version of the Type C.
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	'''Construction Requirements (for Sec 617.10.3)''' The inspector is to perform all necessary quality assurance measures similar to the procedure for any other concrete pavement pour such as slump tests, air tests, etc. Check the plans ahead of time to find out what types of accommodations need to be made for any appurtenances such as guardrail, lighting or sign bases, drains, bridge columns, etc. Details on attachments are to be located in either the contract documents for customized items or in the respective section of the standard plans for standardized items.		'''Construction Requirements (for Sec 617.10.3)''' The inspector is to perform all necessary quality assurance measures similar to the procedure for any other concrete pavement pour such as slump tests, air tests, etc. Check the plans ahead of time to find out what types of accommodations need to be made for any appurtenances such as guardrail, lighting or sign bases, drains, bridge columns, etc. Details on attachments are to be located in either the contract documents for customized items or in the respective section of the standard plans for standardized items.

	'''For Sec 617.10.3.2''' The shape of the concrete traffic barrier is critical since crash tests were performed on the specifically shaped barrier. Concrete traffic barrier is to be constructed to the dimensions shown in [~~http~~://www.modot.~~mo.gov/business/standards_and_specs~~/~~documents~~/~~61710.pdf~~ Standard Plan 617.10].		'''For Sec 617.10.3.2''' The shape of the concrete traffic barrier is critical since crash tests were performed on the specifically shaped barrier. Concrete traffic barrier is to be constructed to the dimensions shown in [https://www.modot.org/media/16893 Standard Plan 617.10].

	Prior to concrete placement, the inspector is to check that the placements of the steel reinforcement, bar sizes, clearances, etc. are according to the plans. Improper alignment of steel could cause the slipform machine to snag or later cause steel popouts. Bars are to be clean of any oil, concrete or other contaminants. The contractor are to mark joint locations prior to slipforming or pouring to minimize the possibility of cutting through steel when sawing joints later. The finished barrier is to be true to line and grade with a smooth and even appearance, free of honeycombed areas or cracks. The finished surface is to be textured, which is typically done with a broom.		Prior to concrete placement, the inspector is to check that the placements of the steel reinforcement, bar sizes, clearances, etc. are according to the plans. Improper alignment of steel could cause the slipform machine to snag or later cause steel popouts. Bars are to be clean of any oil, concrete or other contaminants. The contractor are to mark joint locations prior to slipforming or pouring to minimize the possibility of cutting through steel when sawing joints later. The finished barrier is to be true to line and grade with a smooth and even appearance, free of honeycombed areas or cracks. The finished surface is to be textured, which is typically done with a broom.

EPGsysop: Per CM and EPS, eliminated the specified 4 ft distance required between traffic barrier and stored material. Associated with request #842 (5/17/18)

2018-05-24T15:09:52Z

Per CM and EPS, eliminated the specified 4 ft distance required between traffic barrier and stored material. Associated with request #842 (5/17/18)

← Older revision		Revision as of 10:09, 24 May 2018
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	It is imperative that the Type F barrier be connected together as designed or properly anchored or overlapped when individual barrier sections cannot be properly pinned together. Anything less will not meet NCHRP 350 and may make MoDOT liable if the barrier is hit.		It is imperative that the Type F barrier be connected together as designed or properly anchored or overlapped when individual barrier sections cannot be properly pinned together. Anything less will not meet NCHRP 350 and may make MoDOT liable if the barrier is hit.

	'''For Sec 617.20.4.4''' ~~The area behind the barrier must~~ be ~~clear of any obstructions, including equipment and~~ stored ~~materials, for a minimum of 4 ft. This is so~~ the ~~barrier has room to deflect if hit by an errant vehicle. The barrier absorbs~~ the ~~energy of impact~~ by ~~deflecting. Anything that could restrict the lateral movement of~~ the ~~barrier may cause the barrier to not function properly~~.		'''For Sec 617.20.4.4''' Equipment or material shall not be stored near temporary barriers within the limits shown on the plans or as approved by the engineer.

	'''For Sec 617.20.4.5''' Type F barrier may be anchored to the pavement and bridges as shown on the plans. The barrier is to be anchored on bridges when lateral deflection cannot be tolerated. The method of anchoring on bridge decks will be determined by Bridge and will be shown on the bridge plans.		'''For Sec 617.20.4.5''' Type F barrier may be anchored to the pavement and bridges as shown on the plans. The barrier is to be anchored on bridges when lateral deflection cannot be tolerated. The method of anchoring on bridge decks will be determined by Bridge and will be shown on the bridge plans.

EPGsysop at 19:54, 17 May 2018

2018-05-17T19:54:48Z

← Older revision		Revision as of 14:54, 17 May 2018
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	Inspector's diaries are to contain sufficient notes to establish that any barrier constructed was built according to plan.		Inspector's diaries are to contain sufficient notes to establish that any barrier constructed was built according to plan.
			<div id="Temporary Concrete Traffic Barrier"></div>
	'''[[:category:617 Traffic Barrier#617.1 Temporary Concrete Traffic Barrier\|Temporary Concrete Traffic Barrier]] (for [http://www.modot.org/business/standards_and_specs/SpecbookEPG.pdf#page=9 Sec 617.20])'''		'''[[:category:617 Traffic Barrier#617.1 Temporary Concrete Traffic Barrier\|Temporary Concrete Traffic Barrier]] (for [http://www.modot.org/business/standards_and_specs/SpecbookEPG.pdf#page=9 Sec 617.20])'''

EPGsysop: Per EPS, clarified guidance for anchoring 2-loop and 3-loop concrete barriers on asphalt, composite and concrete pavements in work zones.

2018-05-17T19:23:30Z

Per EPS, clarified guidance for anchoring 2-loop and 3-loop concrete barriers on asphalt, composite and concrete pavements in work zones.

Smithk: updated links

2016-06-09T15:17:45Z

updated links

← Older revision		Revision as of 10:17, 9 June 2016
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	[[image:617.2 Permanent Concrete Traffic Barrier.jpg\|right\|425px\|thumb\|<center>'''[http://www.modot.mo.gov/business/standards_and_specs/documents/61710.pdf Type C] Permanent Concrete Traffic Barrier'''</center>]]		[[image:617.2 Permanent Concrete Traffic Barrier.jpg\|right\|425px\|thumb\|<center>'''[http://www.modot.mo.gov/business/standards_and_specs/documents/61710.pdf Type C] Permanent Concrete Traffic Barrier'''</center>]]
	'''Permanent Concrete Traffic Barrier (for [http://www.modot.~~mo.gov~~/business/standards_and_specs/~~Sec0617~~.pdf Sec 617.10])''' The several different types of permanent concrete traffic barrier are:		'''Permanent Concrete Traffic Barrier (for [http://www.modot.org/business/standards_and_specs/SpecbookEPG.pdf#page=9 Sec 617.10])''' The several different types of permanent concrete traffic barrier are:

	* Type A – is the conventional two-sided “New Jersey” barrier that has two slopes on the face.		* Type A – is the conventional two-sided “New Jersey” barrier that has two slopes on the face.
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	Inspector's diaries are to contain sufficient notes to establish that any barrier constructed was built according to plan.		Inspector's diaries are to contain sufficient notes to establish that any barrier constructed was built according to plan.

	'''[[:category:617 Traffic Barrier#617.1 Temporary Concrete Traffic Barrier\|Temporary Concrete Traffic Barrier]] (for [http://www.modot.~~mo.gov~~/business/standards_and_specs/~~Sec0617~~.pdf Sec 617.20])'''		'''[[:category:617 Traffic Barrier#617.1 Temporary Concrete Traffic Barrier\|Temporary Concrete Traffic Barrier]] (for [http://www.modot.org/business/standards_and_specs/SpecbookEPG.pdf#page=9 Sec 617.20])'''

	'''Certification (for Sec 617.20.3)''' The inspector needs to collect certifications on three-loop Type F temporary concrete traffic barrier. The date of manufacture is stamped on the barrier. The date needs to be checked to verify certification.		'''Certification (for Sec 617.20.3)''' The inspector needs to collect certifications on three-loop Type F temporary concrete traffic barrier. The date of manufacture is stamped on the barrier. The date needs to be checked to verify certification.
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	[[image:617 Concrete Traffic Barrier.jpg\|right\|125px]]		[[image:617 Concrete Traffic Barrier.jpg\|right\|125px]]

	'''Concrete Traffic Barrier Delineators (for [http://www.modot.~~mo.gov~~/business/standards_and_specs/~~Sec0617~~.pdf Sec 617.30])'''.		'''Concrete Traffic Barrier Delineators (for [http://www.modot.org/business/standards_and_specs/SpecbookEPG.pdf#page=9 Sec 617.30])'''.

	'''Material (for Sec 617.30.2)''' For permanent barrier installations, the inspector needs to collect certification on the sheeting used on the delineators and ensure that all delineators meet [http://www.modot.~~mo.gov~~/business/standards_and_specs/~~Sec1065~~.pdf Sec 1065].		'''Material (for Sec 617.30.2)''' For permanent barrier installations, the inspector needs to collect certification on the sheeting used on the delineators and ensure that all delineators meet [http://www.modot.org/business/standards_and_specs/SpecbookEPG.pdf#page=14 Sec 1065].

	'''Construction Requirements (for Sec 617.30.3)''' The face of barrier is no longer painted by the contractor. The delineators take the place of painting the barriers. The delineators are used because they are more retroreflective, above the splash zone and are designed to adhere to the barrier better than paint. If temporary barriers are provided with existing painted faces, the painted face should turned away from traffic if possible or at least positioned so the existing painted face matches the color of the adjacent edgeline. Permanent barriers may be painted by district forces at the district’s discretion after the job is complete.		'''Construction Requirements (for Sec 617.30.3)''' The face of barrier is no longer painted by the contractor. The delineators take the place of painting the barriers. The delineators are used because they are more retroreflective, above the splash zone and are designed to adhere to the barrier better than paint. If temporary barriers are provided with existing painted faces, the painted face should turned away from traffic if possible or at least positioned so the existing painted face matches the color of the adjacent edgeline. Permanent barriers may be painted by district forces at the district’s discretion after the job is complete.

Smithk: moved photo

2011-05-02T19:22:03Z

moved photo

← Older revision		Revision as of 14:22, 2 May 2011
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	'''For Sec 617.20.4.5''' Three-loop barrier may be anchored to the pavement and bridges if shown on the plans. The barrier is to be anchored on bridges when lateral deflection cannot be tolerated. The method of anchoring on bridge decks will be determined by Bridge and will be shown on the bridge plans.		'''For Sec 617.20.4.5''' Three-loop barrier may be anchored to the pavement and bridges if shown on the plans. The barrier is to be anchored on bridges when lateral deflection cannot be tolerated. The method of anchoring on bridge decks will be determined by Bridge and will be shown on the bridge plans.
			[[image:617 Concrete Traffic Barrier.jpg\|right\|125px]]

	'''Concrete Traffic Barrier Delineators (for [http://www.modot.mo.gov/business/standards_and_specs/Sec0617.pdf Sec 617.30])'''.		'''Concrete Traffic Barrier Delineators (for [http://www.modot.mo.gov/business/standards_and_specs/Sec0617.pdf Sec 617.30])'''.

← Older revision		Revision as of 14:23, 17 May 2018
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	'''[[:category:617 Traffic Barrier#617.1 Temporary Concrete Traffic Barrier\|Temporary Concrete Traffic Barrier]] (for [http://www.modot.org/business/standards_and_specs/SpecbookEPG.pdf#page=9 Sec 617.20])'''		'''[[:category:617 Traffic Barrier#617.1 Temporary Concrete Traffic Barrier\|Temporary Concrete Traffic Barrier]] (for [http://www.modot.org/business/standards_and_specs/SpecbookEPG.pdf#page=9 Sec 617.20])'''

	'''Certification (for Sec 617.20.3)''' The inspector needs to collect certifications on ~~three-loop~~ Type F temporary concrete traffic barrier. The date of manufacture is stamped on the barrier. The date needs to be checked to verify certification.		[http://www.modot.mo.gov/business/standards_and_specs/documents/61720.pdf Type F barrier] with three loops is the latest crash-tested temporary barrier. The Type F barrier shall be used on all projects when a temporary barrier is specified.

			'''Certification (for Sec 617.20.3)''' The inspector needs to collect certifications on Type F temporary concrete traffic barrier. The date of manufacture is stamped on the barrier. The date needs to be checked to verify certification.
	617.20.4 Construction Requirements.		617.20.4 Construction Requirements.

	'''For Sec 617.20.4.1''' Used Type F barriers are allowed on the job. If used barriers are brought on the job, ~~the~~ inspector needs to make sure there is no exposed reinforcing steel, bent loops, large sections of concrete missing, significant cracks or other apparent defects that could impact the performance of the barrier.		'''For Sec 617.20.4.1''' Used Type F barriers are allowed on the job. If used barriers are brought on the job, they shall be inspected prior to being installed on a project. The inspector needs to make sure there is no exposed reinforcing steel, bent loops, large sections of concrete missing, significant cracks or other apparent defects that could impact the performance of the barrier.

	It is the contractor’s responsibility to maintain the barrier in acceptable condition. The inspector must notify the contractor of any unacceptable pieces and ensure they are replaced in a reasonable fashion.		It is the contractor’s responsibility to maintain the barrier in acceptable condition. The inspector must notify the contractor of any unacceptable pieces and ensure they are replaced in a reasonable fashion.

	There are two variations of Type F barrier that currently are allowed, the older two-loop version and the newer three-loop design.		The two-loop Type F barrier uses a connection rod with an keeper pin assembly consisting, of a retainer bolt and nut and washer, to connect the sections.

			There are two variations of Type F barrier that currently are allowed, the older two-loop version and the newer three-loop design.
	{\|style="padding: 0.3em; margin-left:5px; border:2px solid #a9a9a9; text-align:center; font-size: 95%; background:#f5f5f5" width="445px" align="right"		{\|style="padding: 0.3em; margin-left:5px; border:2px solid #a9a9a9; text-align:center; font-size: 95%; background:#f5f5f5" width="445px" align="right"
	\|-		\|-
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	\|[[image:617.2 Proper.jpg\|200px]]\|\|[[image:617.2 Improper.jpg\|200px]]		\|[[image:617.2 Proper.jpg\|200px]]\|\|[[image:617.2 Improper.jpg\|200px]]
	\|-		\|-
	\|'''Proper Connection:''' The bottom washer with retainer bolt and nut. \|\|'''Improper Connection:''' No washer or retainer bolt.		\|'''Proper Connection:''' The bottom washer with retainer bolt and nut. \|\|'''Improper Connection:''' No washer or retainer bolt.
	\|}		\|}

	The two-loop barrier uses a connection rod and keeper pin assembly, consisting of a retainer bolt and nut and washer, to connect the sections. The contractor needs to install the retainer bolt and nut and washer at the bottom of the connection rod for the two-loop barrier to perform properly.

	'''For Sec 617.20.4.2''' Two-loop barrier that is manufactured before January 2004 may be used on a project. Any two-loop barrier manufactured after January 2004 must be rejected. Acceptance of two-loop barrier may be based on certification provided by the contractor stating that the barrier was fabricated prior to January 1, 2004 and in accordance with MoDOT specifications in effect at the time of fabrication. A legible MoDOT acceptance stamp on individual segments of barrier as required by the specifications may be waived if certification, as stated above, is provided by the contractor.		'''For Sec 617.20.4.2''' Two-loop barrier that is manufactured before January 2004 may be used on a project. Any two-loop barrier manufactured after January 2004 must be rejected. Acceptance of two-loop barrier may be based on certification provided by the contractor stating that the barrier was fabricated prior to January 1, 2004 and in accordance with MoDOT specifications in effect at the time of fabrication. A legible MoDOT acceptance stamp on individual segments of barrier as required by the specifications may be waived if certification, as stated above, is provided by the contractor.

	[http://www.modot.mo.gov/business/standards_and_specs/documents/61720.pdf Three-loop Type F barrier] is the latest crash-tested temporary barrier. This is the standard barrier the inspector should see on most projects. The three-loop barrier uses a connection rod with an optional keeper pin assembly consisting, of a retainer bolt and nut and washer, to connect the sections. The use of the retainer bolt and nut and bottom washer is at the contractor’s option.		The three-loop barrier uses a connection rod with an optional keeper pin assembly consisting, of a retainer bolt and nut and washer, to connect the sections. The use of the retainer bolt and nut and bottom washer is at the contractor’s option.

	Two-loop and three-loop barrier may be used in combination. The contractor must use the connection rod and keeper pin assembly, consisting of the retainer bolt and nut and washer, if the two temporary barrier types are used in combination. Refer to the box, "2- and 3-Loop Type F Barrier Connections", to the right.		Two-loop and three-loop barrier may be used in combination. The contractor must use the connection rod and keeper pin assembly, consisting of the retainer bolt and nut and washer, if the two temporary barrier types are used in combination. Refer to the box, "2- and 3-Loop Type F Barrier Connections", to the right.

	All exposed Type F barrier ends are to be protected with an approved end treatment. This may include a barrier flare, barrier height transition or crash cushion. Type F height transitions are not to be used where the posted speed prior to construction is greater than 35 mph.		All exposed Type F barrier ends are to be protected with an approved end treatment. This may include a barrier flare, barrier height transition or crash cushion. Type F height transitions are not to be used where the posted speed prior to construction is greater than 35 mph.

	When Type F barrier is hit, the localized area of impact usually bunches up several sections of barrier and makes ~~pinning~~ the barriers back together impossible without extending the barrier back out to its original location. Although overlapping of the barrier is acceptable at these locations, to be crashworthy the overlap needs to consist of , at minimum, six sections of barrier, i.e., 75 ft. (23 m) of barrier. Instead of requiring an overlap of 75 ft., it is recommended that the contractor be required, when possible, to extend the barrier back out to its original length thereby eliminating the overlap and allowing the units to be ~~pinned~~ back together as designed. This can be accomplished without much effort if equipment (such as a forklift) operating to the rear of the barrier lift and push individual sections back together. If the barrier cannot be realigned, then the contractor will have no other choice but add sections to the barrier to provide the required 75-ft. overlap or to anchor the barrier.		When Type F barrier is hit, the localized area of impact usually bunches up several sections of barrier and makes connecting the barriers back together impossible without extending the barrier back out to its original location. Although overlapping of the barrier is acceptable at these locations, to be crashworthy the overlap needs to consist of , at minimum, six sections of barrier, i.e., 75 ft. (23 m) of barrier. Instead of requiring an overlap of 75 ft., it is recommended that the contractor be required, when possible, to extend the barrier back out to its original length thereby eliminating the overlap and allowing the units to be connected back together as designed. This can be accomplished without much effort if equipment (such as a forklift) operating to the rear of the barrier lift and push individual sections back together. If the barrier cannot be realigned, then the contractor will have no other choice but add sections to the barrier to provide the required 75-ft. overlap or to anchor the barrier.

	Anchoring alternatives consist of either anchoring the barrier into the pavement or drilling barrier sections so as to allow overlapped barrier sections to be anchored together with steel rods. Anchoring the barrier to the pavement is not allowed unless that segment of pavement is planned to be removed and replaced or will not be part of the final traveled way. If a contractor is interested in anchoring overlapping sections ~~together~~, ~~please~~ contact Construction and Materials for details. While anchoring barriers together, the contractor will need to take care to prevent damaging any barrier reinforcement steel by the drilling operations. If drilling damages any barrier reinforcement steel, the barrier cannot be used except for where overlapped and anchored together.		If a contractor is interested in anchoring overlapping sections of barrier, contact Construction and Materials for details.

	It is imperative that the Type F barrier be connected together as designed or properly anchored or overlapped when individual barrier sections cannot be properly pinned together. Anything less will not meet NCHRP 350 and may make MoDOT liable if the barrier is hit.		It is imperative that the Type F barrier be connected together as designed or properly anchored or overlapped when individual barrier sections cannot be properly pinned together. Anything less will not meet NCHRP 350 and may make MoDOT liable if the barrier is hit.
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	'''For Sec 617.20.4.4''' The area behind the barrier must be clear of any obstructions, including equipment and stored materials, for a minimum of 4 ft. This is so the barrier has room to deflect if hit by an errant vehicle. The barrier absorbs the energy of impact by deflecting. Anything that could restrict the lateral movement of the barrier may cause the barrier to not function properly.		'''For Sec 617.20.4.4''' The area behind the barrier must be clear of any obstructions, including equipment and stored materials, for a minimum of 4 ft. This is so the barrier has room to deflect if hit by an errant vehicle. The barrier absorbs the energy of impact by deflecting. Anything that could restrict the lateral movement of the barrier may cause the barrier to not function properly.

	'''For Sec 617.20.4.5''' ~~Three-loop~~ barrier may be anchored to the pavement and bridges if shown on the plans. The barrier is to be anchored on bridges when lateral deflection cannot be tolerated. The method of anchoring on bridge decks will be determined by Bridge and will be shown on the bridge plans.		'''For Sec 617.20.4.5''' Type F barrier may be anchored to the pavement and bridges as shown on the plans. The barrier is to be anchored on bridges when lateral deflection cannot be tolerated. The method of anchoring on bridge decks will be determined by Bridge and will be shown on the bridge plans.
	[[image:617 Concrete Traffic Barrier.jpg\|right\|125px]]		[[image:617 Concrete Traffic Barrier.jpg\|right\|125px]]

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	'''Construction Requirements (for Sec 617.30.3)''' The face of barrier is no longer painted by the contractor. The delineators take the place of painting the barriers. The delineators are used because they are more retroreflective, above the splash zone and are designed to adhere to the barrier better than paint. If temporary barriers are provided with existing painted faces, the painted face should turned away from traffic if possible or at least positioned so the existing painted face matches the color of the adjacent edgeline. Permanent barriers may be painted by district forces at the district’s discretion after the job is complete.		'''Construction Requirements (for Sec 617.30.3)''' The face of barrier is no longer painted by the contractor. The delineators take the place of painting the barriers. The delineators are used because they are more retroreflective, above the splash zone and are designed to adhere to the barrier better than paint. If temporary barriers are provided with existing painted faces, the painted face should turned away from traffic if possible or at least positioned so the existing painted face matches the color of the adjacent edgeline. Permanent barriers may be painted by district forces at the district’s discretion after the job is complete.



	[[Category:617 Traffic Barrier]]		[[Category:617 Traffic Barrier]]