Review on Bridge Superstructure Drawings

Written by Team Highway Correspondence

Updated on:

Review on Bridge Superstructure Drawings

Content Brief:

Review on Bridge Superstructure Drawings: This content pertains to the Review observations on major river bridge Superstructure GAD drawings.

These observations are made by the IE following the concessionaire’s submission of GAD drawings.

The details and letters contain the following information:

  • Major bridge general arrangement drawings submission.

  • Review observations on drawings.

  • The observations, including the clarification and justification needed on the following

    a. expansion joints

    b. Max. Scour Level, Socket lengths

    c. Live load combinations.

    d. Lateral and vertical pile capacity

    e. Dimension details of Abutment and Pier

    g. Abutment design and Pier design-cantilever wall moments, L.L. reactions, piles horizontal deflections

  • Further, an updated, certified design addressing the points is requested for further review.

  • Additionally, there are elements that are not consistent with the Concession Agreement (CA).

  • Finally, provide IE feedback in line with the review.

Review on Bridge Superstructure Drawings

Letter on Review observations on Major Bridge Superstructure Drawings-Reg.

The following is a sample draft letter format to notify the concessionaire about the review observations on major river bridge superstructure drawings.

To

The concessionaire

subject: Review observations on major river bridge superstructure GAD drawings

Dear Sir,

With reference to the above-mentioned letter, the drawings submitted for the superstructure of the major bridge on the river at Ch. 17+400 in the project highway have been reviewed by our senior bridge design engineer, and the following are the observations:

1. Drawing no. KRIS/GEN-101

  • Expansion joints (dimension) to be shown in GAD.

  • Max. Scour Level should be mentioned in the drawing.

  • Note no. 3: Live load combinations mentioned to be as per IRC: 6.

  • Lateral and vertical pile capacity should be mentioned in the drawing.

2. Drawing no. KRIS/SUB-201 A

Section A-A and B-B locations to be shown.

3. Drawing no. KRIS/SUB-202 A

Section B-B and C-C, dimensions of hollow section mismatches between design calculations (3.750 m) and drawing (3.850 m). Please check.

4. Soil investigation report/drawings of dimension detail of Abutment and Pier:

  • Socket length mismatches between soil report and drawing in both abutment and pier case. Please clarify.

  • Founding level for pile mismatches between soil report and drawing in both abutment and pier case. Please clarify.

5. Abutment design:

  • While designing return wall cantilever wall moments should be added to return wall’s moments.

  • Backup calculations for L.L. reactions (max/min) considered in design calculations are to be provided.

  • Piles to be checked for horizontal deflection.

  • Length of fixity of pile should be calculated as per IS 2911.

6. Pier design:

  • The width (dimension) of the void considered in the design (3.750 m) mismatches with the dimension detail of the pier drawing (3.850 m).

  • Backup calculations for L.L. reactions to be provided.

  • Pier section not designed for normal condition.

  • Piles to be checked for horizontal deflection.

Please comply with the observations and resubmit the same.

Thanking you,

Request letter for submission of Temporary staging arrangement Drawings for superstructure of Bridges

To

The Concessionaire

Subject: Temporary staging arrangement drawings for the superstructure of bridges, Submission and Review-Reg

Dear Sir.

During the site visit on dated XX.XX.2024, it was observed that the work for the superstructure’s temporary staging work was progressing in different locations of the project highway without proper and adequate load-bearing supports or props and sufficient bracings.

Therefore, it is being instructed to submit proper and detailed false work design and drawings for superstructure for our review before proceeding with the work at site.

The submission should be as per the reviewed work methodology and be accepted via letter No. xxxxx XX-XX-2024 and technical specifications clause section 1503 and IRC: 87.

This is for your information and necessary action only

Thanking You,

A Note to the Visitor on Review Observations on Major Bridge Superstructure Drawings

It is that a few important and mandatory aspects are only discussed herewith. Kindly note that the above review observations on Major river Bridge Superstructure Drawings are considered as examples. You may adopt the gist of the subject and change it to suit the current need. And before using this content in your letter draughting, you need to ensure the specific type of drawing, CA contractual conditions, and other aspects, etc.

Also read the Review observations on Major Bridge GAD Drawings and the Review observations on minor Bridge GAD Drawings.

You can find various sample draft formats for highway operation and maintenance correspondence.

FAQ’s related to Review observations on Major Bridge Superstructure Drawings

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