714 - Temporary Structures and Approaches - Revision history

Greenes2: /* Formwork */

2014-01-29T18:41:32Z

Formwork

Greenes2: /* Formwork */

2014-01-29T18:40:32Z

Formwork

Greenes2: /* Removal */

2014-01-29T18:38:53Z

Removal

Greenes2: /* Temporary Bridge Structures, Falsework, Work Platforms and Scaffolding */

2014-01-29T18:37:25Z

Temporary Bridge Structures, Falsework, Work Platforms and Scaffolding

Greenes2: /* Formwork */

2014-01-29T18:34:45Z

Formwork

Greenes2: /* Temporary Bridge Structures, Falsework, Work Platforms and Scaffolding */

2014-01-29T18:33:41Z

Temporary Bridge Structures, Falsework, Work Platforms and Scaffolding

Greenes2: /* Temporary Earth Retaining Structures and Cofferdams */

2014-01-29T18:31:56Z

Temporary Earth Retaining Structures and Cofferdams

Greenes2: /* Temporary Bridge Structures */

2014-01-29T18:30:14Z

Temporary Bridge Structures

Greenes2: /* Temporary Bridge Structures */

2014-01-29T18:27:59Z

Temporary Bridge Structures

Greenes2: /* GENERAL */

2014-01-29T18:20:28Z

GENERAL

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 * External vibration should not be used if the forms were not designed for this method of concrete consolidation. Excessive vibration of new concrete or deep vibration into semi-hardened lifts may place higher than expected loads on formwork. Depth of vibration should be limited to the top current lift of new concrete. Also, new concrete should not be placed until previous pours have stiffened sufficiently as to reduce lateral pressures on the forms.  See Figure 7 from the ''Dayton-Superior, Concrete Forming Accessories Product Handbook (06-11):''
-</center>[[File:714 Fig 7.png|thumb|center|600px|Figure 714-7 - Proper vibrating techniques in deep forms]]</center>
+<center>[[File:714 Fig 7.png|thumb|center|600px|Figure 714-7 - Proper vibrating techniques in deep forms]]</center>
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@@ Line 212: / Line 212: @@
 * External vibration should not be used if the forms were not designed for this method of concrete consolidation. Excessive vibration of new concrete or deep vibration into semi-hardened lifts may place higher than expected loads on formwork. Depth of vibration should be limited to the top current lift of new concrete. Also, new concrete should not be placed until previous pours have stiffened sufficiently as to reduce lateral pressures on the forms.  See Figure 7 from the ''Dayton-Superior, Concrete Forming Accessories Product Handbook (06-11):''
-center>[[File:714 Fig 7.png|thumb|center|600px|Figure 714-7 - Proper vibrating techniques in deep forms]]</center>
+</center>[[File:714 Fig 7.png|thumb|center|600px|Figure 714-7 - Proper vibrating techniques in deep forms]]</center>
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 ===[[#Removal|Removal]]===
-Ensure the Contractor removes all bridge temporary works, with the exception of stay in place forms per [http://mdotcf.state.mi.us/public/specbook/files/2012/104 Control of Work.pdf subsection 104.07 of the Standard Specifications for Construction].
+Ensure the Contractor removes all bridge temporary works, with the exception of stay in place forms per subsection [http://mdotcf.state.mi.us/public/specbook/files/2012/104%20Control%20of%20Work.pdf 104.07] of the Standard Specifications for Construction.
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@@ Line 186: / Line 186: @@
 * Bolted and welded joints are constructed per plan.
-Ensure removal of falsework supporting structural concrete elements is not done prior to the concrete attaining 70% of the specified 28-day flexural or compressive design strength, and for at least 5 days following concrete placement per [http://mdotcf.state.mi.us/public/specbook/files/2012/706 Str Conc Construction.pdf subsection 706.03.O of the Standard Specifications for Construction.]
+Ensure removal of falsework supporting structural concrete elements is not done prior to the concrete attaining 70% of the specified 28-day flexural or compressive design strength, and for at least 5 days following concrete placement per subsection [http://mdotcf.state.mi.us/public/specbook/files/2012/706%20Str%20Conc%20Construction.pdf 706.03.O] of the Standard Specifications for Construction.
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 Prefabricated or Modular type formwork is typically reused on many different projects.  Inspect the formwork when the components arrive on site, and ensure only components that are in good condition are used.
-Measure the inside openings of the forms, and compared to plan dimensions for formed elements.  Ensure tolerances [http://mdotcf.state.mi.us/public/specbook/files/2012/706 Str Conc Construction.pdf per subsection 706.03.D of the Standard Specifications for Construction.]
+Measure the inside openings of the forms, and compared to plan dimensions for formed elements.  Ensure tolerances per subsection [http://mdotcf.state.mi.us/public/specbook/files/2012/706%20Str%20Conc%20Construction.pdf 706.03.D] of the Standard Specifications for Construction.
 The following checklist from the ''AASHTO Construction Handbook for Bridge Temporary Works'' can be used as a guide for inspection during temporary bridge structure and falsework erection.  Some of these elements may not apply to every situation:

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 Ensure material section tolerances meet the requirements of “''ASTM International “Standard Specification for General Requirements for Rolled Steel Bars, Plates, Shapes, and Sheet Piling for Structural Use (ASTM A6)”.  ''See Figure 5 for permitted variations in sectional dimensions, See Figure 6 for permitted variations in straightness.  For welded members, see American Welding Society, Bridge Welding Code, D1.5.
-Ensure the Contractor properly maintains temporary bridge structures and falsework during construction operations, and removes these items per [http://mdotcf.state.mi.us/public/specbook/files/2012/104 Control of Work.pdf subsection 104.07 of the Standard Specifications for Construction.]
+Ensure the Contractor properly maintains temporary bridge structures and falsework during construction operations, and removes these items per subsection [http://mdotcf.state.mi.us/public/specbook/files/2012/104%20Control%20of%20Work.pdf 104.07] of the Standard Specifications for Construction.
-Ensure both traffic and construction work are protected per [http://mdotcf.state.mi.us/public/specbook/files/2012/812 Temp Traf Control.pdf section 812 of the Standard Specifications for Construction.]
+Ensure both traffic and construction work are protected per section [http://mdotcf.state.mi.us/public/specbook/files/2012/812%20Temp%20Traf%20Control.pdf 812] of the Standard Specifications for Construction.]
 Check the plans and specifications for temporary traffic control items that are related to temporary works activities.

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-Temporary earth retaining structures (other than Cofferdams) called for on the plans are designed by the bridge designer with input from the Geotechnical Services area.  Any Contractor proposed temporary earth retaining structures must be submitted for review and approval [http://mdotcf.state.mi.us/public/specbook/files/2012/104 Control of Work.pdf per subsection 104.02 of the Standard Specifications for Construction] prior to beginning work.
+Temporary earth retaining structures (other than Cofferdams) called for on the plans are designed by the bridge designer with input from the Geotechnical Services area.  Any Contractor proposed temporary earth retaining structures must be submitted for review and approval per subsection [http://mdotcf.state.mi.us/public/specbook/files/2012/104%20Control%20of%20Work.pdf 104.02] of the Standard Specifications for Construction] prior to beginning work.
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 ===[[#Design and Approval Process|Design and Approval Process]]===

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 ===[[#Temporary Bridge Structures|Temporary Bridge Structures]]===
-Unless designed by the Bridge Designer, and shown on the plans, any Contractor proposed temporary bridge structures must be designed and sealed by a professional Engineer licensed in the state of Michigan.  The Contractor is responsible to design the temporary bridge structure per subsection [http://mdotcf.state.mi.us/public/specbook/files/2012/714 Temp Str & Approaches.pdf 714.03.B of the Standard Specifications for Construction.]
+Unless designed by the Bridge Designer, and shown on the plans, any Contractor proposed temporary bridge structures must be designed and sealed by a professional Engineer licensed in the state of Michigan.  The Contractor is responsible to design the temporary bridge structure per subsection [http://mdotcf.state.mi.us/public/specbook/files/2012/714%20Temp%20Str%20&%20Approaches.pdf 714.03.B] of the Standard Specifications for Construction.
 It is the Contractor’s responsibility to design, construct, maintain, remove and dispose of temporary bridge structures and approaches.
-Temporary bridge structures can be one way, or two way if supporting the traveling public, and must meet the width requirements per subsection [http://mdotcf.state.mi.us/public/specbook/files/2012/714 Temp Str & Approaches.pdf 714.03.B] of the Standard Specifications for Construction.
+Temporary bridge structures can be one way, or two way if supporting the traveling public, and must meet the width requirements per subsection [http://mdotcf.state.mi.us/public/specbook/files/2012/714%20Temp%20Str%20&%20Approaches.pdf 714.03.B] of the Standard Specifications for Construction.
 Temporary bridge structures may also be proposed by the Contractor for site access, or movement of materials and equipment over waterways or other obstructions within the project site.

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 It is the Contractor’s responsibility to design, construct, maintain, remove and dispose of temporary bridge structures and approaches.
-Temporary bridge structures can be one way, or two way if supporting the traveling public, and must meet the width requirements per subsection [http://mdotcf.state.mi.us/public/specbook/files/2012/714 Temp Str & Approaches.pdf 714.03.B of the Standard Specifications for Construction.]
+Temporary bridge structures can be one way, or two way if supporting the traveling public, and must meet the width requirements per subsection [http://mdotcf.state.mi.us/public/specbook/files/2012/714 Temp Str & Approaches.pdf 714.03.B] of the Standard Specifications for Construction.
 Temporary bridge structures may also be proposed by the Contractor for site access, or movement of materials and equipment over waterways or other obstructions within the project site.
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 ===[[#Falsework|Falsework]]===
 Falsework is defined as temporary construction used to support the permanent structure, or permanent structural elements until it becomes self-supporting.  Falsework would include steel or timber beams, girders, bracing, columns, piles and foundations, and any proprietary equipment including modular shoring frames, post shores, and horizontal shoring.

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 ==[[#GENERAL|GENERAL]]==
 Temporary structures include those proposed by MDOT or the Contractor to convey traffic, or construction equipment during a construction project.  Temporary structures also include temporary works type items such as falsework, formwork, work platforms or scaffolding and temporary earth retaining structures and cofferdams that are required to be designed and sealed by a licensed professional Engineer in the state of Michigan.
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 ===[[#Temporary Bridge Structures|Temporary Bridge Structures]]===
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 ===[[#Falsework|Falsework]]===
 Falsework is defined as temporary construction used to support the permanent structure, or permanent structural elements until it becomes self-supporting.  Falsework would include steel or timber beams, girders, bracing, columns, piles and foundations, and any proprietary equipment including modular shoring frames, post shores, and horizontal shoring.
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 ===[[#Formwork|Formwork]]===
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 ===[[#Work Platforms and Scaffolding|Work Platforms and Scaffolding]]===
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 ===[[#Temporary Earth Retaining Structures and Cofferdams|Temporary Earth Retaining Structures and Cofferdams]]===
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 ===[[#Design and Approval Process|Design and Approval Process]]===