713 - Bridge Rehabilitation, Steel - Revision history

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

Greenes2 at 15:20, 2 May 2014

2014-05-02T15:20:35Z

Show changes

Rinarda at 14:03, 24 July 2013

2013-07-24T14:03:10Z

Rinarda at 18:37, 25 June 2013

2013-06-25T18:37:27Z

Rinarda at 18:28, 11 June 2013

2013-06-11T18:28:35Z

← 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.

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-==GENERAL==
+==[[#GENERAL|GENERAL]]==
-===Shop Plans===
+===[[#Shop Plans|Shop Plans]]===
 See [[707 - Structural Steel|Section 707]] of this manual.
@@ Line 16: / Line 16: @@
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-==MATERIALS==
+==[[#MATERIALS|MATERIALS]]==
-===Furnishing and Fabricating Structural Steel===
+===[[#Furnishing and Fabricating Structural Steel|Furnishing and Fabricating Structural Steel]]===
 Furnishing and fabricating structural steel additions and replacements for existing structures and for steel portions of temporary supports shall be according to [http://mdotcf.state.mi.us/public/specbook/files/2012/713%20Br%20Rehab%20-%20Steel.pdf Section 707].  Shop drawings shall be submitted for approval prior to fabrication.  See [http://mdotcf.state.mi.us/public/specbook/files/2012/713%20Br%20Rehab%20-%20Steel.pdf Section 713] of the Standard Specifications for Construction.
@@ Line 25: / Line 25: @@
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-===Retrofit Structural Steel===
+===[[#Retrofit Structural Steel|Retrofit Structural Steel]]===
 See [http://mdotcf.state.mi.us/public/specbook/files/2012/713%20Br%20Rehab%20-%20Steel.pdf Section 713] of the Standard Specifications for Construction.
@@ Line 31: / Line 31: @@
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-==CONSTRUCTION==
+==[[#CONSTRUCTION|CONSTRUCTION]]==
-===Temporay Supports for Girder Ends===
+===[[#Temporay Supports for Girder Ends|Temporay Supports for Girder Ends]]===
 Temporary supports for girder ends may either be as shown on the plans or an alternate design proposed by the Contractor and approved by the Engineer.
@@ Line 40: / Line 40: @@
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-===Column-Type Supports and Suspension-Type Supports===
+===[[#Column-Type Supports and Suspension-Type Supports|Column-Type Supports and Suspension-Type Supports]]===
 See [http://mdotcf.state.mi.us/public/specbook/files/2012/713%20Br%20Rehab%20-%20Steel.pdf Section 713] of the Standard Specifications for Construction.
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-===Pin and Hanger Replacement===
+===[[#Pin and Hanger Replacement|Pin and Hanger Replacement]]===
 Measurement and Removal of Existing Hangar Assemblies - see [http://mdotcf.state.mi.us/public/specbook/files/2012/713%20Br%20Rehab%20-%20Steel.pdf Section 713] of the Standard Specifications for Construction.
@@ Line 54: / Line 54: @@
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-===Bearing Stiffeners at Temporary Supports===
+===[[#Bearing Stiffeners at Temporary Supports|Bearing Stiffeners at Temporary Supports]]===
 See [http://mdotcf.state.mi.us/public/specbook/files/2012/713%20Br%20Rehab%20-%20Steel.pdf Section 713] of the Standard Specifications for Construction.
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-===Sealing the Perimeter of Beam Plates===
+===[[#Sealing the Perimeter of Beam Plates|Sealing the Perimeter of Beam Plates]]===
 The sealant shall be applied around the perimeter of bolted or riveted plates or angle on a steel beam as directed by the Engineer.  Apply the sealant over the epoxy intermediate coat when dry to the touch.  The top coat shall be applied over the sealant when the intermediate coat is fully cured.  The surfaces between the repair plate or angle and the beam and the surfaces in contact with the sealant shall be clean and dry at the time of application.  The sealant shall not be applied when the air or surface temperature is below 40°F (5°C).  Immediately after the sealant is applied, it shall be tooled to form a 5/16 inch fillet and to force it against the contact surface.  Sufficient sealant shall be applied to completely fill all pits and depressions regardless of width and depth in the steel beam at the seam line.
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-===Heat Straightening Damaged Structural Steel===
+===[[#Heat Straightening Damaged Structural Steel|Heat Straightening Damaged Structural Steel]]===
 See [http://mdotcf.state.mi.us/public/specbook/files/2012/713%20Br%20Rehab%20-%20Steel.pdf Section 713] of the Standard Specifications for Construction.
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-==MEASUREMENT AND PAYMENT==
+==[[#MEASUREMENT AND PAYMENT|MEASUREMENT AND PAYMENT]]==
 <span style="color: red"> -Reserved- </span>
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← Older revision		Revision as of 18:28, 11 June 2013
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	===Shop Plans===		===Shop Plans===

−	See Section 707 of this manual.	+	See [[707 - Structural Steel\|Section 707]] of this manual.