708 - Prestressed Concrete - Revision history

Clarkj25: /* I-Beams, 1800 Beams, and Bulb-Tee Beams */

2024-10-23T16:02:22Z

I-Beams, 1800 Beams, and Bulb-Tee Beams

Clarkj25: /* Box Beams */

2024-10-23T16:01:52Z

Box Beams

Clarkj25 at 19:06, 3 July 2024

2024-07-03T19:06:47Z

Show changes

Clarkj25: /* MEASUREMENT, DOCMENTATION & PAYMENT */

2024-07-03T19:03:04Z

MEASUREMENT, DOCMENTATION & PAYMENT

Clarkj25: /* INSPECTION & TESTING */

2024-07-03T19:01:53Z

INSPECTION & TESTING

Clarkj25: /* CONSTRUCTION */

2024-07-03T19:01:08Z

CONSTRUCTION

Clarkj25: /* CONSTRUCTION */

2024-07-03T18:00:12Z

CONSTRUCTION

Clarkj25: /* Handling, Storage, and Transporting */

2024-07-03T17:55:20Z

Handling, Storage, and Transporting

Clarkj25: /* Workmanship */

2024-07-03T17:54:18Z

Workmanship

Clarkj25: /* Workmanship */

2024-07-03T17:53:45Z

Workmanship

@@ Line 269: / Line 269: @@
 *Prestressed beams and girders, especially taller and longer members, can be more prone to sweep, transverse deflection, or even rotation. For this reason, they should be rigidly blocked in place via diaphragm connections to ensure proper spacing between members and to avoid beam rotation during construction.
 *Verify member (beam or girder) bearing pads are shimmed (when necessary) on each member in an approved manner during erection to provide full bearing contact with the bottoms of the beam/girder.
-*(1800 Girder only) Verify use of beveled sole plates on each girder and note in the Inspector Daily Report (IDR).
+*(1800 Girder only) Verify use of beveled sole plates on each girder and note in the Daily Work Report (DWR).
-*Note in the Inspector Daily Report (IDR) when erection has been completed.
+*Note in the Daily Work Report (DWR) when erection has been completed.
 ==== Spun Pole ====

@@ Line 250: / Line 250: @@
 *(Fixed Bearings Only) Verify the holes are filled with Type H-1 grout.
 *(Side-by-Side Box Beams Only) Verify beams are set with spaces as specified on the contract plans or shop drawings and that seal washers are placed around the transverse post-tensioning conduit holes.
-*Note in the Inspector Daily Report (IDR) when erection has been completed.
+*Note in the Daily Work Report (DWR) when erection has been completed.
 Below is a list of items the inspector should check regarding the post-tensioning of side-by-side box beams after erection:
@@ Line 262: / Line 262: @@
 '''Do not stand behind the jacking machine or rod holes during jacking procedures. If a tendon or rod snaps, it can cause serious injury'''
 ==== I-Beams, 1800 Beams, and Bulb-Tee Beams ====

@@ Line 302: / Line 302: @@
 ==[[#MEASUREMENT, DOCMENTATION & PAYMENT|'''MEASUREMENT, DOCMENTATION & PAYMENT''']]==
-===Documentation Requirements===
+===Basis of Payment===
-===Basis of Payment===
+There are three methods of payment for structural precast concrete members: Stockpile payment, partial shipment payment, and final shipment payment. No method of payment relieves the Contractor (or Fabricator) from damage due to transporting, storing on the project site, or erecting the elements. Additional information on payment can be found in Section 109 of the MDOT Standard Specifications for Construction.
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@@ Line 296: / Line 296: @@
 ==[[#INSPECTION & TESTING|'''INSPECTION & TESTING''']]==
-===Inspection Procedures===
+<span style="color: red"> -Reserved- </span>
 {{top}}

@@ Line 262: / Line 262: @@
 '''Do not stand behind the jacking machine or rod holes during jacking procedures. If a tendon or rod snaps, it can cause serious injury'''
 ==== I-Beams, 1800 Beams, and Bulb-Tee Beams ====
 Below is a list of items the inspector should check regarding the erection of structural prestressed beams and girders:
-•	After the first and second member (beam or girder) are erected, the second member must be attached to first through the diaphragm connection(s). In addition, each subsequent member must be attached to the previously erected member through the diaphragm connection(s).
+*After the first and second member (beam or girder) are erected, the second member must be attached to first through the diaphragm connection(s). In addition, each subsequent member must be attached to the previously erected member through the diaphragm connection(s).
-o	Prestressed beams and girders, especially taller and longer members, can be more prone to sweep, transverse deflection, or even rotation. For this reason, they should be rigidly blocked in place via diaphragm connections to ensure proper spacing between members and to avoid beam rotation during construction.
+*Prestressed beams and girders, especially taller and longer members, can be more prone to sweep, transverse deflection, or even rotation. For this reason, they should be rigidly blocked in place via diaphragm connections to ensure proper spacing between members and to avoid beam rotation during construction.
-•	Verify member (beam or girder) bearing pads are shimmed (when necessary) on each member in an approved manner during erection to provide full bearing contact with the bottoms of the beam/girder.
+*Verify member (beam or girder) bearing pads are shimmed (when necessary) on each member in an approved manner during erection to provide full bearing contact with the bottoms of the beam/girder.
-•	(1800 Girder only) Verify use of beveled sole plates on each girder and note in the Inspector Daily Report (IDR).
+*(1800 Girder only) Verify use of beveled sole plates on each girder and note in the Inspector Daily Report (IDR).
-•	Note in the Inspector Daily Report (IDR) when erection has been completed.
+*Note in the Inspector Daily Report (IDR) when erection has been completed.
 ==== Spun Pole ====
 Below is a list of items the inspector should check regarding the erection of prestressed spun poles:
-•	During installation, the poles must only be lifted and stored using the locations and methods shown on the approved shop drawings or manufacturer’s instructions.
+*During installation, the poles must only be lifted and stored using the locations and methods shown on the approved shop drawings or manufacturer’s instructions.
-•	Visually inspect spun pole for any damage, cracks, or spalls and notify the Engineer if present.
+*Visually inspect spun pole for any damage, cracks, or spalls and notify the Engineer if present.
-o	Note, the concrete clear cover for spun poles is typically less than a prestressed beam so cracks or spalls may increase the members susceptibility to steel corrosion.
+*Note, the concrete clear cover for spun poles is typically less than a prestressed beam so cracks or spalls may increase the members susceptibility to steel corrosion.
-•	Spun concrete poles must be safely secured after being placed in the drilled shaft installation before the concrete foundation is poured and cured
+*Spun concrete poles must be safely secured after being placed in the drilled shaft installation before the concrete foundation is poured and cured
 ==== Sound Wall ====
 Below is a list of items the inspector should check regarding the erection of sound walls:
-•	In most cases the sound wall panels are attached to the posts using tongue and groove joints. It is important during erection that the panels are lowered slowly into position and do not crack or spall the posts.
+*In most cases the sound wall panels are attached to the posts using tongue and groove joints. It is important during erection that the panels are lowered slowly into position and do not crack or spall the posts.
-•	If the sound wall posts contain grout pockets (prestressed sound walls only), then the grout pockets at the ends of the posts must be filled with non-shrink grout and should be free of cracks.
+*If the sound wall posts contain grout pockets (prestressed sound walls only), then the grout pockets at the ends of the posts must be filled with non-shrink grout and should be free of cracks.
-o	Note, a ladder should be used to visually inspect the tops of soundwall posts.
+*Note, a ladder should be used to visually inspect the tops of soundwall posts.
-•	Visually inspect sound wall posts for damage, shrinkage, cracks, or spalls and notify the Engineer if present.
+*Visually inspect sound wall posts for damage, shrinkage, cracks, or spalls and notify the Engineer if present.
-o	Note, cracks and other deficiencies will be subject to moisture and chloride intrusion which can lead to rapid deterioration of the posts.
+*Note, cracks and other deficiencies will be subject to moisture and chloride intrusion which can lead to rapid deterioration of the posts.

@@ Line 232: / Line 232: @@
 ==[[#CONSTRUCTION|'''CONSTRUCTION''']]==
-===Construction Requirements/Procedures/Installation Methods===
+===Erection of Prestressed Beams===
-−
-===Safety===
+Considerable care should be exercised when handling structural precast concrete elements. In many cases, there is no way to repair a damaged element short of re-fabrication. Below is a list of items the inspector should check regarding the erection of structural prestressed members.
-===Productivity information/charts===
+==== I-Beams, 1800 Beams, and Bulb-Tee Beams ====
-===Items of Note===
+==== Spun Pole ====
 {{top}}

@@ Line 210: / Line 210: @@
 ==== Handling, Storage, and Transporting ====
 When loading and shipping occurs, the Supplier (Fabricator) will load the members on a truck and the QAI inspects all members again for conformance to specifications since handling damage can occur when members are transported and loaded for shipping.
 The Supplier (Fabricator) is required to provide the QAI with a minimum of five (5) copies of the Bill of Lading for each proposed shipment per the SFQM. Each Bill of Lading will be stamped “Approved for Use” (see Acceptance process below). One copy of the Bill of Lading is retained by the QAI and the other four copies are distributed to the Contractor, Supplier (Fabricator), Engineer, and Trucking Company.
 Once the structural prestressed member has been visually inspected and accepted by the Engineer, the construction inspector should verify the products are stored properly prior to erection. The method of stockpiling and transporting members is covered in detail in subsection 708.03 of the Standard Specifications for Construction. Below is a list of items the inspector should check regarding the storage of structural prestressed members:
-•	Support beams off the ground to prevent moisture and deleterious material intrusion.
+* Support beams off the ground to prevent moisture and deleterious material intrusion.
-•	Support beams across the full width on two battens, each greater than 4 inches wide.
+* Support beams across the full width on two battens, each greater than 4 inches wide.
-•	Support beams on two battens, no more than 3 feet from the ends of the beams.
+* Support beams on two battens, no more than 3 feet from the ends of the beams.
-•	Support stacked beams, one above the other along the same vertical plane at each end of the beams.
+* Support stacked beams, one above the other along the same vertical plane at each end of the beams.
-•	Support the beams on level, stable ground, avoid storing beams near side slopes, or areas near heavy construction traffic.
+* Support the beams on level, stable ground, avoid storing beams near side slopes, or areas near heavy construction traffic.
-•	Do not support the beam at more than two points.
+* Do not support the beam at more than two points.
-•	Prestressed I-beam shapes may need to be laterally braced on site.
+* Prestressed I-beam shapes may need to be laterally braced on site.
-•	Members are to be stored in an upright position and should be thoroughly braced to avoid overturning, which may damage the member itself, adjacent members or material, or injure personnel in the immediate vicinity.
+* Members are to be stored in an upright position and should be thoroughly braced to avoid overturning, which may damage the member itself, adjacent members or material, or injure personnel in the immediate vicinity.
-•	Related items such as bearings and bridge railing should also be protected from damage, dirt, and corrosion.
+* Related items such as bearings and bridge railing should also be protected from damage, dirt, and corrosion.
 ===== Loading and Shipping =====

@@ Line 195: / Line 195: @@
 The SFU has developed standard repair procedures for common defects observed on fabricated prestressed members. These repair procedures have been reviewed by industry and should be used by the Supplier (Fabricator) when applicable to expedite the review process. The QAI or Construction Inspector should be familiar with these standard repair procedures for common deficiencies.
 MDOT Standard Repair Procedures: SFU Website (See Appendix A4 of SFQM)
 ===== Tolerances =====

@@ Line 191: / Line 191: @@
 Approved repairs are typically completed at the Supplier’s (Fabricator’s) facility prior to the member shipping to the project site; however, there may be some circumstances where approved repairs are conducted at the project site due to project schedules. In both cases, the Supplier (Fabricator) typically performs the repairs. Repairs conducted at the Supplier’s (Fabricator’s) facility will be witnessed by the QAI and repairs conducted at the project site will be witnessed by the MDOT Construction Inspector.
 NCR Process: SFU Website (See section 8 of SFQM)
 The SFU has developed standard repair procedures for common defects observed on fabricated prestressed members. These repair procedures have been reviewed by industry and should be used by the Supplier (Fabricator) when applicable to expedite the review process. The QAI or Construction Inspector should be familiar with these standard repair procedures for common deficiencies.
 MDOT Standard Repair Procedures: SFU Website (See Appendix A4 of SFQM)