751.8 Concrete Box Culverts - Revision history

Hoskir: Hoskir moved page 751.8 LRFD Concrete Box Culverts to 751.8 Concrete Box Culverts: renamed per RR3868

2024-07-19T18:43:43Z

Hoskir moved page 751.8 LRFD Concrete Box Culverts to 751.8 Concrete Box Culverts: renamed per RR3868

← Older revision	Revision as of 13:43, 19 July 2024
(No difference)

Hoskir: /* 751.8.3.5 Miscellaneous */ updated per RR3848

2024-05-09T18:54:47Z

751.8.3.5 Miscellaneous: updated per RR3848

← Older revision		Revision as of 13:54, 9 May 2024
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	A transverse joint is not required when extending the barrel not more than 15 feet. When extensions exceed 15 feet, transverse joint requirements are the same as those for full culverts, see [[#751.8.3.1 Joints\|EPG 751.8.3.1]].		A transverse joint is not required when extending the barrel not more than 15 feet. When extensions exceed 15 feet, transverse joint requirements are the same as those for full culverts, see [[#751.8.3.1 Joints\|EPG 751.8.3.1]].

			'''Guardrail Attachments'''
			When guardrail attachments are required for new culverts they shall be in accordance with [[751.12_Barriers,_Railings,_Curbs_and_Fences#751.12.6_Culvert_Guardrail_.28Top_Mounted.29\|EPG 751.12.6 Culvert Guardrail (Top Mounted)]]. When attaching guardrail to an existing culvert follow the guidance outlined in [[751.1_Preliminary_Design#751.1.3.4_Barrier_or_Railing_Type.2C_Height_and_Guidelines_for_Curb_Blockouts\|EPG 751.1.3.4 Barrier or Railing Type,Height and Guidelines for Curb Blockouts]].

Hoskir: updated 2 images - Elevation of exterior and interior wings

2022-10-06T19:45:51Z

updated 2 images - Elevation of exterior and interior wings

← Older revision		Revision as of 14:45, 6 October 2022
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	''E1 bar –'' Provide 4- #5 bars and they should extend into wing walls as far as practical as shown in Figure 751.8.3.2.3. For wing walls on rock, these bars shall be extended 12” into the rock and grouted.		''E1 bar –'' Provide 4- #5 bars and they should extend into wing walls as far as practical as shown in Figure 751.8.3.2.3. For wing walls on rock, these bars shall be extended 12” into the rock and grouted.

	[[image:751.8.3~~.2.3 2015~~.jpg\|center\|750px]]		[[image:751-8-3-2_WallReinf-Ext_10-22.jpg\|center\|750px]]
			<center><big>'''(a) ELEVATION OF EXTERIOR WING'''</big></center>


	[[image:751.8.3~~.2.3a 2015~~.jpg\|center\|775px]]		[[image:751-8-3-2_WallReinf-Int_10-22.jpg\|center\|775px]]
			<center><big>'''(b) ELEVATION OF INTERIOR WING'''</big></center>

Smithk: Per BR, updated broken links

2022-01-11T15:22:25Z

Per BR, updated broken links

← Older revision		Revision as of 10:22, 11 January 2022
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	'''Spacing Limit of Steel Reinforcement'''		'''Spacing Limit of Steel Reinforcement'''

	See [[751.5 Standard Details#751.5.~~10 Reinforcing Steel Detailing~~\|EPG 751.5.10]].		See [[751.5 Standard Details#751.5.9.2.5 Spacing Limits\|EPG 751.5.9.2.5 Spacing Limits]].

	==751.8.3 Details==		==751.8.3 Details==
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	<center>'''Figure 751.8.3.2.1 Typical Cross-Section of Standard Box Culvert Showing Bar Marks'''</center>		<center>'''Figure 751.8.3.2.1 Typical Cross-Section of Standard Box Culvert Showing Bar Marks'''</center>

	''B1 bar -'' Steel reinforcement shall be designed for maximum combined axial load and moment at interior walls. This bar is placed vertical near stream faces of the wall. Minimum steel reinforcement of #5 bars spaced at 12” centers shall be provided. This bar should be extended into the top and bottom slabs. A hook bar may be required if the embedment length is insufficient due to slab thickness limitations. [[751.5 Standard Details#751.5.11 Development and ~~Splicing of Reinforcement~~ \|EPG 751.5.~~11]~~] has information pertaining to development of tension reinforcement and hooks.		''B1 bar -'' Steel reinforcement shall be designed for maximum combined axial load and moment at interior walls. This bar is placed vertical near stream faces of the wall. Minimum steel reinforcement of #5 bars spaced at 12” centers shall be provided. This bar should be extended into the top and bottom slabs. A hook bar may be required if the embedment length is insufficient due to slab thickness limitations. [[751.5 Standard Details#751.5.9.2.8.1 Development and Lap Splice General\|EPG 751.5.9.2.8.1 Development and Lap Splice General] has information pertaining to development of tension reinforcement and hooks.

	''B2 bar –'' For culverts with bottom slabs, steel reinforcement shall be designed for the maximum positive moment in the exterior wall. For culverts on rock, steel reinforcement shall be designed for the maximum combined positive moment and axial load. This bar is placed vertical near the stream face of the wall. Minimum steel reinforcement of #5 bar spacing at 12” centers shall be provided. This bar should be extended into the top and bottom slabs. A hook bar may be required if the embedment length is insufficient due to slab thickness limitations. [[751.5 Standard Details#751.5.11 Development and ~~Splicing of Reinforcement~~ \|EPG 751.5.11]] has information pertaining to development of tension reinforcement and hooks.		''B2 bar –'' For culverts with bottom slabs, steel reinforcement shall be designed for the maximum positive moment in the exterior wall. For culverts on rock, steel reinforcement shall be designed for the maximum combined positive moment and axial load. This bar is placed vertical near the stream face of the wall. Minimum steel reinforcement of #5 bar spacing at 12” centers shall be provided. This bar should be extended into the top and bottom slabs. A hook bar may be required if the embedment length is insufficient due to slab thickness limitations. [[751.5 Standard Details#751.5.9.2.8.1 Development and Lap Splice General\|EPG 751.5.9.2.8.1 Development and Lap Splice General]] has information pertaining to development of tension reinforcement and hooks.

	''J3 bar - ''Steel reinforcement shall be designed for the maximum negative moment in the top corner of the culvert. This bar is placed vertical along the wall and transversely perpendicular to the centerline of culvert.		''J3 bar - ''Steel reinforcement shall be designed for the maximum negative moment in the top corner of the culvert. This bar is placed vertical along the wall and transversely perpendicular to the centerline of culvert.

Smithk: Updated website link for increased security

2021-10-25T14:48:08Z

Updated website link for increased security

← Older revision		Revision as of 09:48, 25 October 2021
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	\|colspan="2"\|<center>'''Fig. 751.8.3.3.1 Details of Plan Showing Rock Elevations for Alternate #1'''</center>		\|colspan="2"\|<center>'''Fig. 751.8.3.3.1 Details of Plan Showing Rock Elevations for Alternate #1'''</center>
	\|-		\|-
	\|colspan="2"\|'''Note:''' See [~~http~~://epg.modot.~~mo.gov~~/index.php?title=751.50_Standard_Detailing_Notes#A2._Concrete_Box_Culverts_and_Other_Type_Structures EPG 751.50 A2] for appropriate notes to include on plans.		\|colspan="2"\|'''Note:''' See [https://epg.modot.org/index.php?title=751.50_Standard_Detailing_Notes#A2._Concrete_Box_Culverts_and_Other_Type_Structures EPG 751.50 A2] for appropriate notes to include on plans.
	\|-		\|-
	\|colspan="2"\|'''Instruction:''' All box culverts on rock shall have the rock elevations shown on the plans at significant changes along each wall.		\|colspan="2"\|'''Instruction:''' All box culverts on rock shall have the rock elevations shown on the plans at significant changes along each wall.

Smithk: /* 751.8.3.2 Steel Reinforcement */

2021-09-16T18:13:41Z

751.8.3.2 Steel Reinforcement

← Older revision		Revision as of 13:13, 16 September 2021
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	''R3 bar -'' Provide minimum #5 bar spacing at 12” centers. This bar is placed perpendicular to longitudinal axis of downstream headwall or edge beam.		''R3 bar -'' Provide minimum #5 bar spacing at 12” centers. This bar is placed perpendicular to longitudinal axis of downstream headwall or edge beam.

	[[image:751.8.3.2.2 2021.jpg\|center\|~~775px~~]]		[[image:751.8.3.2.2 2021.jpg\|center\|875px]]
	<center>'''Fig. 751.8.3.2.2 Typical Sections and Details of Steel Reinforcement</center>'''		<center>'''Fig. 751.8.3.2.2 Typical Sections and Details of Steel Reinforcement</center>'''

Smithk: /* 751.8.3.2 Steel Reinforcement */ Per BR, revised increments for legs of shaped bars from ⅛” to ¼” due to upcoming move to new bill of reinforcing steel software that does not allow ⅛” increments

2021-09-16T18:10:37Z

751.8.3.2 Steel Reinforcement: Per BR, revised increments for legs of shaped bars from ⅛” to ¼” due to upcoming move to new bill of reinforcing steel software that does not allow ⅛” increments

← Older revision		Revision as of 13:10, 16 September 2021
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	''R3 bar -'' Provide minimum #5 bar spacing at 12” centers. This bar is placed perpendicular to longitudinal axis of downstream headwall or edge beam.		''R3 bar -'' Provide minimum #5 bar spacing at 12” centers. This bar is placed perpendicular to longitudinal axis of downstream headwall or edge beam.

	[[image:751.8.3.2.2 ~~2015~~.jpg\|center\|775px~~\|thumb\|~~<center>'''Fig. 751.8.3.2.2 Typical Sections and Details of Steel Reinforcement</center>''']]		[[image:751.8.3.2.2 2021.jpg\|center\|775px]]
			<center>'''Fig. 751.8.3.2.2 Typical Sections and Details of Steel Reinforcement</center>'''

	'''Wings'''		'''Wings'''

Smithk: Per BR, the "Box Culvert Quantity Program" is no longer available for consultant use and was deleted.

2020-07-28T18:58:04Z

Per BR, the "Box Culvert Quantity Program" is no longer available for consultant use and was deleted.

← Older revision		Revision as of 13:58, 28 July 2020
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	~~{\|style="padding: 0.3em; margin-left:10px; border:2px solid #a9a9a9; text-align:left; font-size: 95%; background:#f5f5f5" width="460px" align="right"~~
	\|-
	~~\|align="center"\|'''[http://www.modot.org/business/BoxCulvertQuantityProgram.htm Box Culvert Quantity Program]'''~~
	\|-
	\|align="center"\|This program helps consultants estimate quantities when using MoDOT standard box culvert tables and plans. It also generates a bill of reinforcing steel which can be included with the plans.
	\|}

	==751.8.1 General==		==751.8.1 General==

Smithk: /* 751.8.3.5 Miscellaneous */

2018-09-27T18:50:41Z

751.8.3.5 Miscellaneous

← Older revision		Revision as of 13:50, 27 September 2018
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	'''Wing Backfill Slope Transition'''		'''Wing Backfill Slope Transition'''

	Backfill slope transition at wings is determined based on skew angle of box culvert. See Sheet 2 of 2 in [~~http~~://www.modot.~~mo.gov/business/standards_and_specs~~/~~documents~~/~~70337.pdf~~ Standard Plan 703.37] for slope transition.		Backfill slope transition at wings is determined based on skew angle of box culvert. See Sheet 2 of 2 in [https://www.modot.org/media/16943 Standard Plan 703.37] for slope transition.

	'''Culvert Extensions'''		'''Culvert Extensions'''

	When an existing culvert is to be extended, cutting details shall be followed to determine where and how to cut the existing culvert. See [~~http~~://www.modot.~~mo.gov/business/standards_and_specs~~/~~documents~~/~~70338.pdf~~ Standard Plan 703.38] for cutting details.		When an existing culvert is to be extended, cutting details shall be followed to determine where and how to cut the existing culvert. See [https://www.modot.org/media/16944 Standard Plan 703.38] for cutting details.

	A transverse joint is not required when extending the barrel not more than 15 feet. When extensions exceed 15 feet, transverse joint requirements are the same as those for full culverts, see [[#751.8.3.1 Joints\|EPG 751.8.3.1]].		A transverse joint is not required when extending the barrel not more than 15 feet. When extensions exceed 15 feet, transverse joint requirements are the same as those for full culverts, see [[#751.8.3.1 Joints\|EPG 751.8.3.1]].

Smithk: /* 751.8.3.2 Steel Reinforcement */

2018-09-27T18:21:05Z

751.8.3.2 Steel Reinforcement

← Older revision		Revision as of 13:21, 27 September 2018
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	'''Barrel Section '''		'''Barrel Section '''

	Standard boxes shall have main reinforcement placed perpendicular to the centerline of culvert. In any case, main reinforcement should not be skewed more than 25° from a line normal to the centerline of the culvert. (See LRFD 9.7.1.3.) The bar sizes, spacings and lengths given in the [~~http~~://www.modot.~~mo.gov/business/standards_and_specs~~/~~documents~~/~~70317.pdf~~ Standard Plans 703.17], [~~http~~://www.modot.~~mo.gov/business/standards_and_specs~~/~~documents~~/~~70347.pdf~~ 703.47] and [~~http~~://www.modot.~~mo.gov/business~~/~~standards_and_specs~~/~~documents/70387.pdf~~ 703.87] are applicable for uncoated steel reinforcement. Figure 751.8.3.2.1 shows a typical cross-section of standard box culvert and bar marks of steel reinforcement which are described below:		Standard boxes shall have main reinforcement placed perpendicular to the centerline of culvert. In any case, main reinforcement should not be skewed more than 25° from a line normal to the centerline of the culvert. (See LRFD 9.7.1.3.) The bar sizes, spacings and lengths given in the [https://www.modot.org/media/16942 Standard Plans 703.17], [https://www.modot.org/media/16953 703.47] and [https://www.modot.org/media/16962 703.87] are applicable for uncoated steel reinforcement. Figure 751.8.3.2.1 shows a typical cross-section of standard box culvert and bar marks of steel reinforcement which are described below:

	''A1 bar - ''Steel reinforcement shall be designed for maximum positive moment in the top slab. This bar is placed transversely perpendicular to the centerline of culvert at the bottom of top slab. Place A1 bars into headwall or edge beam as close as practical.		''A1 bar - ''Steel reinforcement shall be designed for maximum positive moment in the top slab. This bar is placed transversely perpendicular to the centerline of culvert at the bottom of top slab. Place A1 bars into headwall or edge beam as close as practical.
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	{\| style="margin: 1em auto 1em auto" width="516"		{\| style="margin: 1em auto 1em auto" width="516"
	\|-		\|-
	\|For box culverts where collars are required and the precast option is used, precast concrete box culvert ties in accordance with [http://www.modot.org/business/standards_and_specs/SpecbookEPG.pdf#page=11 Sec 733] and [~~http~~://www.modot.org/~~business~~/~~standards_and_specs/documents/73300.pdf~~ Std. Plan 733.00] shall be provided between all precast sections.		\|For box culverts where collars are required and the precast option is used, precast concrete box culvert ties in accordance with [http://www.modot.org/business/standards_and_specs/SpecbookEPG.pdf#page=11 Sec 733] and [https://www.modot.org/media/16978 Std. Plan 733.00] shall be provided between all precast sections.
	\|}		\|}