111 - Construction Coordination

From Delaware DOT Bridge Design Manual
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111.1 Working Drawings

Working drawings submitted for acceptance shall be prepared by the contractor in accordance with the requirements of the Plans, Department Standards, Special Provisions and Standard Specifications. Working drawing review is conducted to ensure that fabrication of items is in accordance with the intent of the Contract Documents. Working drawings shall be properly reviewed and accepted before fabrication begins.

Working drawings include, but are not limited to, stress sheets, fabrication drawings, erection plans, falsework plans, formwork plans, cofferdam plans, bending diagrams for reinforcing steel, or any other supplementary plans or similar data that the contractor is required to submit to the Engineer for approval.

111.1.1 Required Working Drawings

Unless stated otherwise in the Contract Documents, the following items routinely require submission of working drawings:

  1. Fabricated structural steel including, but not limited to, the following:
    1. Primary and secondary members, such as girders, trusses, beams, framing systems, cross bracing, diaphragms, and stringers
    2. Expansion joints
    3. Sign structures
  2. Pre-tensioned, pre-post-tensioned, and post-tensioned concrete beams and panels
  3. Permanent metal deck forms
  4. Metal plate culverts
  5. Precast concrete culverts, Three-sided Frames and Arches
  6. Precast deck sections –Pretensioned, post-tensioned, or reinforced concrete
  7. Timber bridges
  8. Proprietary retaining walls
  9. Shear Stud details
  10. Light poles
  11. Protective fence and protective shields
  12. Bridge bearings (all types)
  13. Bridge demolition plans
  14. Temporary excavation support systems
  15. Temporary protective shields
    1. Temporary jacking towers, supports, and falsework
    2. Reinforcing bars for cast-in-place concrete elements
    3. Erection Plan, as per Standard Specifications
    4. Piles and pile-splicing (H-pile; precast, prestressed concrete; and steel shell pipe)

111.1.2 Working Drawings Review Procedure

Working drawings shall be submitted for each structure individually (items pertaining to the same Bridge Number). This procedure will facilitate bookkeeping and minimize confusion during record storage. Each drawing must contain a title block in the lower right-hand corner indicating the county, route, contract number, specific Contract item number and specification reference, name of the contractor, name of the Supplier, title of drawing, sheet number, bridge ID number, initials of the drawer, initials of the checker, and date of the drawing.

A record log of working drawing submissions should be prepared and maintained throughout the course of a project’s construction. At a minimum, the record log should include the name and revision number of the submission, applicable contract specification, date the submission was received by the Department, the reviewer’s name, the disposition of the submission and the date the submission was returned to the contractor (or supplier).

Working drawings shall be submitted by the contractor in accordance with the Standard Specifications. The initial submissions of the working drawings can be made in electronic format (Adobe Acrobat Portable Document File [PDF] is required) using compact discs, a project-specific FTP website, or via e-mail, all as approved by the Department. Once the submission is approved and released for fabrication, the contractor shall submit hard copies of the working drawings in quantities as requested by the Department for their record keeping.

The working drawings shall be reviewed for general conformity against the Contract Documents, including contract revisions, all addenda up to the date of the review, and any previously reviewed and commented-on versions of the working drawing. When the review is complete, the reviewer will add comments, corrections, and a review stamp. The returned working drawings will be stamped as follows:

  1. Returned for Resubmission – in this case, revisions or corrections must be made, and the drawings resubmitted for review.
  2. Reviewed for General Conformity with Plans and Specifications – in this case, if the contractor agrees with the comments, the comments shall be incorporated, and a resubmission is not required.

The words “As Noted” should be marked immediately above the review stamp on each page of the drawing containing any marking, note, or corrections written by the drawing reviewer.

All review stamps shall include the reviewer’s full name (not just initials), and shall be date-stamped.

Only after all drawings are stamped “Reviewed for General Conformity with Plans and Specifications,” can material requisition and fabrication commence. If any of the drawings in a working drawing submission are stamped “Returned for Resubmission,” notify the supplier (and the contractor) of the situation and arrange to have the entire working drawing submission corrected and resubmitted until all working drawings of the submission are found to be satisfactory.

Approved working drawings of structural elements must be submitted to the Bridge Management Engineer for inclusion in the Bridge Inspection File.

In accordance with the Standard Specifications, reviewed working drawings, submittals, or resubmittals will be transmitted to the contractor within 21 days from the date of receipt by the Department. Consultant Review of Working Drawings

On Consultant-designed projects, the prime consultant has the primary responsibility for the process and review of working drawings. The review procedure will adhere to the criteria provided above and as modified herein.

If the prime consultant also employs a subconsultant for review of working drawings, the subconsultant’s review stamp is required following their review of the documents. Subsequently, the prime consultant shall affix their review stamp after they perform a QA review.

All consultant firms providing working drawing review services, either prime consultants or subconsultant, should implement a quality control process to provide a complete review of the working drawings by individuals knowledgeable in the work. The QC process should be submitted to the Department prior to the start of the working drawing review effort.

All consultant review stamps should include the full name of the reviewer (not just initials), the firm’s name and date stamped.

The final stamp by the prime consultant should read “Reviewed for General Conformity with Plans and Specifications for DelDOT.”

111.1.3 Technical Guidelines for Review of Working Drawings

The following contains technical guidelines for the review of working drawings based on the submitted item(s). This list is not all–inclusive, but should be used as guidance during the review of any working drawing:

  • Fabricated Structural Steel
Review in accordance with the Shop Detail Review/Approval Guidelines (2000) developed by the AASHTO / National Steel Bridge Alliance (NSBA) Steel Bridge Collaboration.
  • Expansion Joints
A “Temperature-Joint Opening” chart ranging from 0 °F to 120 °F in 10-degree increments must be shown on the working drawings for expansion joints.
  • Bridge Railings and Protective Fences
Check that railings and fences are spliced at bridge expansion joints. Confirm fence-post spacing is indicated. Ensure that all steel hardware complies with the requirements of the Standard Specifications.
  • Bridge Bearings
    • Check the orientation of the bearings, both relative to the girder, and to bearing components.
    • Check that the materials, surface finishes, and details for pot bearings are in conformance with the Contract Documents.
    • For laminated elastomeric bearings, check for size, total thickness, layers of neoprene, number of shims, hardness of neoprene, and skew and clip, if any.
  • Pre-Tensioned and Post-Tensioned Concrete Beams and Panels
    • The working drawings must show a framing plan for the entire structure, including proper beam identification for each beam. The force and eccentricity for all beams must conform to the design drawings. Deviations must be substantiated by calculations submitted by the fabricator with the working drawings.
    • Check the beam lengths and continuity details for conformance with the Contract Documents.
    • Concrete release strength and 28-day compressive strength must be shown on the working drawings, as well as strand patterns and all cast-in hardware, voids, or other components.
    • Check that the tensile stresses in the top fiber of beams at the centerline of bearing are within tolerances or have been reduced to within allowable stresses by either unbonding, or unbonding supplemented with mild reinforcement.
    • Check that shear reinforcement is properly spaced and sized in the beams.
    • Check insert sizes and locations in the beams (i.e., inserts for attachment of diaphragms, utility supports, lighting fixtures)
  • Permanent Metal Deck Forms (SIP Forms)
    • Check that the furnished formwork provides sufficient section modulus and moment of inertia for the required span length (Center-to-center of beams less the flange width)
    • Confirm that formwork supports are not welded to flanges in tension zones.
  • Proprietary Retaining Walls (MSE Walls, Bin-Type Walls)
    • Check general dimensions for lines, grade, and product elements.
    • Confirm backfill materials are consistent with information contained in the Plans, Special Provisions, and/or Standard Specifications.
    • Check local wall stability calculations and confirm they coordinate with the global stability calculations prepared by the project’s designer and the geotechnical and loading requirements of the contract documents, including anticipated settlement.
    • Confirm the construction sequence of the wall coordinates with that of the contract documents, including geotechnical quarantine periods and staged construction methods.
  • Proprietary Precast Concrete Arch Culverts (e.g., ConSpan)
    • Check the section lengths for conformance with the Contract Documents.
    • Concrete 28-day compressive strength must be shown on the working drawings, as well as reinforcement locations and all cast-in hardware, voids, or other components.
    • Check that reinforcement is properly spaced and sized.
    • Check insert sizes and locations in the sections (i.e., inserts for attachment of utility supports, lighting fixtures).

111.2 Contractor Requests for Information

During construction, the contractor may require clarification of the design intent, additional information, and/or approval of a minor variance from the Contract Documents. These questions are generally submitted by way of a Request for Information (RFI).

A record log of all RFI submissions should be prepared and maintained throughout the course of a project’s construction. At a minimum, the record log should include a brief description of the RFI, applicable contract specification, date the submission was received by the Department, the reviewer’s name, the disposition of the submission, and the date the submission was returned to the contractor (or supplier). A number identifier of the RFI must also be shown.

The review and processing of RFI responses must be time-sensitive. In general, RFI responses should be prepared and returned to the contractor within 5 working days. If more than 5 days are required to investigate and complete an RFI response, the contractor should be advised as to the time required within the 5-day period.

111.3 Value Engineering Proposals (by Contractor)

Value Engineering Proposals by the contractor shall be submitted and reviewed in accordance with the Standard Specifications.

111.4 Plan Revisions

Plan revisions are design changes that are made during construction. These changes may require change orders approved by the contractor and the Department. Plan revisions will also require review by the FHWA on PoDI oversight projects.

Items that must be issued as a Plan Revision include:

  1. Changes requiring recomputation of hydrology and hydraulics;
  2. Changes to the roadway pavement box section;
  3. Changes in profile or alignment;
  4. Safety-related changes;
  5. Changes requiring additional right-of-way, easement areas, or impacts to wetlands and subaqueous areas;
  6. All bridge changes, except quantity changes and foundation stabilizations not related to spread-footing bearing;
  7. New specifications for materials;
  8. Other items, if approved by the Construction Engineer.

All plan revisions shall begin by crossing out the erroneous or modified information, clouding the correct information, and marking the corrections with a revision designator (i.e., R1, R2). No information should be deleted or erased. The revision block (in the title block) should be used to indicate the nature of the revision; the initials of the responsible persons for drafting, checking, and recommending the revision; and the recommendation date. Revisions should be numbered consecutively for the contract (i.e., If plan revision R3 is issued and it affects plan sheet 10, it shall be numbered as R3 even though it may be the first change to that particular sheet.).

Additional information related to plan revisions is contained in the “Plan Revision Guidelines,” located on the DRC – Project Management Tab.

111.5 As-Built Drawings

Frequently, changes are made in some aspects of the design during construction. The DelDOT Resident Construction Engineer is responsible for recording these changes on a record plan set during construction. These record plans are then provided to the DelDOT Archive Section for incorporation into the “As-Built” plan set. All changes are incorporated in the same fashion as indicated in Section 111.4 – Plan Revisions.

111.6 References

AASHTO and NSBA, 2000. Shop Detail Review/Approval Guidelines, Developed by the AASHTO/NSBA Steel Bridge Collaboration.

DelDOT, 2020. Standard Specifications for Road and Bridge Construction, August.