713 - Bridge Rehabilitation, Steel - Revision history

Clarkj25: /* Column Type */

2023-04-10T21:29:32Z

Column Type

Clarkj25: /* Column Type */

2023-04-10T21:28:01Z

Column Type

SchaeferS: Removed 2012 Spec Book tagline link

2022-01-19T15:46:53Z

Removed 2012 Spec Book tagline link

SchaeferS: /* MEASUREMENT AND PAYMENT */

2021-05-12T20:35:20Z

MEASUREMENT AND PAYMENT

Greenes2: /* MEASUREMENT AND PAYMENT */

2014-05-21T12:08:31Z

MEASUREMENT AND PAYMENT

Greenes2: /* Welded Repairs */

2014-05-02T15:27:56Z

Welded Repairs

Greenes2: /* Heat Straightening Damaged Structural Steel */

2014-05-02T15:26:27Z

Heat Straightening Damaged Structural Steel

Greenes2: /* Diaphragm Type */

2014-05-02T15:24:41Z

Diaphragm Type

Greenes2: /* Cutting Beam Ends */

2014-05-02T15:22:39Z

Cutting Beam Ends

Greenes2: /* Cutting Beam Ends */

2014-05-02T15:21:53Z

Cutting Beam Ends

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 During the first four hours after loading, check hourly for settlement of temporary supports, and after that check daily. Shims must be added to correct any settlement in excess of 1/16 inch.
-Ensure the contractor does not place the column based plate directly on finished concrete.  Timber mats are typically detailed in the plans.  A general example a column type temporary support can be found in [https://mdotjboss.state.mi.us/stdplan/getStandardPlanDocument.htm?docGuid=3083d916-623d-4418-bb5f-3022984b2c6b Appendix 7.06.04A of the MDOT Bridge Design Manual.]
+Ensure the contractor does not place the column based plate directly on finished concrete.  Timber mats are typically detailed in the plans.  A general example a column type temporary support can be found in [https://mdotjboss.state.mi.us/stdplan/englishbridgemanual.htm MDOT Bridge Design Manual.]
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@@ Line 39: / Line 39: @@
 During the first four hours after loading, check hourly for settlement of temporary supports, and after that check daily. Shims must be added to correct any settlement in excess of 1/16 inch.
-Ensure the contractor does not place the column based plate directly on finished concrete.  Timber mats are typically detailed in the plans.  A general example a column type temporary support can be found in [http://mdotcf.state.mi.us/public/design/files/englishbridgemanual/ebdm07LFD.pdf Appendix 7.06.04A of the MDOT Bridge Design Manual.]
+Ensure the contractor does not place the column based plate directly on finished concrete.  Timber mats are typically detailed in the plans.  A general example a column type temporary support can be found in [https://mdotjboss.state.mi.us/stdplan/getStandardPlanDocument.htm?docGuid=3083d916-623d-4418-bb5f-3022984b2c6b Appendix 7.06.04A of the MDOT Bridge Design Manual.]
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← Older revision		Revision as of 15:46, 19 January 2022
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	<center><span STYLE="font: 40pt arial;">'''Bridge Rehabilitation - Steel'''</span></center>		<center><span STYLE="font: 40pt arial;">'''Bridge Rehabilitation - Steel'''</span></center>

−	~~<center>[http://mdotcf.state.mi.us/public/specbook/files/2012/713%20Br%20Rehab%20-%20Steel.pdf 2012 STANDARD SPECIFICATIONS FOR CONSTRUCTION - SECTION 713]</center>~~

← Older revision		Revision as of 20:35, 12 May 2021
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	[[Category:Construction Manual]]		[[Category:Construction Manual]]
		+	[[Category: Division 7]]
		+	[[Category: Section 713]]

← Older revision		Revision as of 12:08, 21 May 2014
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−	[[Category:Construction Manual	+	[[Category:Construction Manual]]

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 ===[[#Welded Repairs|Welded Repairs]]===
 Remove structural steel as shown on the plans using mechanical methods, plasma cutting, or air-arc gouging. Ensure that removal does not extend beyond the limits shown on the plans, and ensure that adjacent structural steel is not damaged. Removal or damage of structural steel beyond the limits shown in the plans should immediately be brought to the attention of the [http://www.michigan.gov/mdot/0,4616,7-151-9623_26663_56139_56173---,00.html Engineer and Bridge Field Services.]
-Preparation of existing structural steel to accept proposed components may include grinding, drilling, and coping holes in accordance with the plans. All field welding, inspection, and testing must be in accordance with [http://mdotcf.state.mi.us/public/specbook/2012/ section 707 of the Standard Specifications for Construction] and cleaning and coating must be in accordance with [http://mdotcf.state.mi.us/public/specbook/2012/ section 715 of the Standard Specifications for Construction]. Ensure that any field welding is done by a certified welder with an approved weld procedure. Any vertical field welding must be done in the upward direction (starting at the bottom and working towards the top). Welding vertically in the downward direction is not permitted.
+Preparation of existing structural steel to accept proposed components may include grinding, drilling, and coping holes in accordance with the plans. All field welding, inspection, and testing must be in accordance with [http://mdotcf.state.mi.us/public/specbook/files/2012/707%20Str%20Steel%20Construction.pdf section 707 of the Standard Specifications for Construction] and cleaning and coating must be in accordance with [http://mdotcf.state.mi.us/public/specbook/files/2012/715%20Clean,%20Coat%20Exist%20Str%20St.pdf section 715 of the Standard Specifications for Construction]. Ensure that any field welding is done by a certified welder with an approved weld procedure. Any vertical field welding must be done in the upward direction (starting at the bottom and working towards the top). Welding vertically in the downward direction is not permitted.
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 It is important to finish heat straightening before reattaching any cross frames or diaphragms. Forcing the beams into position to attach cross frames or diaphragms is not permitted.
-Ensure that all bends, creases, folds and dents in beam, diaphragm and stiffener elements are eliminated.  See [http://mdotcf.state.mi.us/public/specbook/2012/ section 713 of the Standard Specifications for Construction] for the tolerances for heat straightening.
+Ensure that all bends, creases, folds and dents in beam, diaphragm and stiffener elements are eliminated.  See [http://mdotcf.state.mi.us/public/specbook/files/2012/713%20Br%20Rehab%20-%20Steel.pdf section 713 of the Standard Specifications for Construction] for the tolerances for heat straightening.
-Once heat straightening is complete, ensure the contractor grinds burrs, nicks, gouges and scrapes.  Report cracks or tears in the beams, or other structural steel elements to the Engineer.  Cracks are to be repaired by welding in accordance with subsection [http://mdotcf.state.mi.us/public/specbook/2012/ 707.03.D.8 of the Standard Specifications for Construction.]
+Once heat straightening is complete, ensure the contractor grinds burrs, nicks, gouges and scrapes.  Report cracks or tears in the beams, or other structural steel elements to the Engineer.  Cracks are to be repaired by welding in accordance with subsection [http://mdotcf.state.mi.us/public/specbook/files/2012/707%20Str%20Steel%20Construction.pdf 707.03.D.8 of the Standard Specifications for Construction.]
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 If sufficient space permits the placement of hydraulic jacks directly on substructure units, ensure the hydraulic jacks are placed directly under load bearing diaphragms.
-H-1 grout in accordance with [http://mdotcf.state.mi.us/public/specbook/2012/ section 702 of the Standard Specifications for Construction] must be used under hydraulic jacks to provide a smooth and level bearing surface.  Ensure the contractor does not apply load until the grout reaches a compressive strength of 4,000 psi.
+H-1 grout in accordance with [http://mdotcf.state.mi.us/public/specbook/files/2012/702%20Mortar%20and%20Grout.pdf section 702 of the Standard Specifications for Construction] must be used under hydraulic jacks to provide a smooth and level bearing surface.  Ensure the contractor does not apply load until the grout reaches a compressive strength of 4,000 psi.
 If multiple hydraulic jacks are used they must be equally loaded and simultaneously advanced to avoid uneven or eccentric load which could damage the structure. Jacks must remain in place until repair or replacement and operation of structural components although the contractor may disconnect lines and pumps provided the equipment remains on the project.

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 ===[[#Cutting Beam Ends|Cutting Beam Ends]]===
-Beam ends must be cut with a plasma cutting torch to provide adjacent vertical beam ends that are 1 inch apart. The same amount shall be cut from each adjacent beam end, but no more than ½ inch from either beam. Beam ends must be marked prior to cutting and guides or straight edges shall be used to provide control.  All cut edges must be ground to remove burrs, nicks, gouges, and scrapes before cleaning and coating in accordance with http://mdotcf.state.mi.us/public/specbook/files/2012/715%20Clean,%20Coat%20Exist%20Str%20St.pdf section 715 of the Standard Specifications for Construction].
+Beam ends must be cut with a plasma cutting torch to provide adjacent vertical beam ends that are 1 inch apart. The same amount shall be cut from each adjacent beam end, but no more than ½ inch from either beam. Beam ends must be marked prior to cutting and guides or straight edges shall be used to provide control.  All cut edges must be ground to remove burrs, nicks, gouges, and scrapes before cleaning and coating in accordance with [http://mdotcf.state.mi.us/public/specbook/files/2012/715%20Clean,%20Coat%20Exist%20Str%20St.pdf section 715 of the Standard Specifications for Construction].
 When trimming beam ends at pin and hanger assemblies, ensure the pin plates themselves are not trimmed.  For wide flange beams, the protruding web and fillet weld may be removed.