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    Comments on DWA-A 127-2 submitted

    Comments on DWA-A 127-2 submitted

    IngSoft provides 211 notes

    On 1 August 2024, the DWA published the "Draft DWA-A 127-2 Solid Wall Pipes". The usual objection period for worksheets ran until 31 October 2024. At IngSoft, work had been running in parallel since August:

    1. In software development, colleagues were (and still are) working on programming the equations, tables, text comments and diagrams. The aim is to provide a new calculation module for trench installation for the IngSoft EasyPipe pipe statics programme in the medium term
    2. In addition, it was necessary to go through the text of the yellow print in order to submit anomalies and suggestions for improvement to the DWA.

    Scope of the worksheet

    • Including cover page and final page: 120 pages (PDF)
    • Minus preliminary remarks, list of tables and overview of abbreviations and appendices, ~53 pages of relevant content remain
    • Scope of our contribution to the draft of worksheet DWA-A 127-2
      • Statistics of the commentary table: 62 pages, 10393 words, 62268 characters (without spaces), 1409 paragraphs, 3256 lines
      • A total of 211 comments and suggestions
    • Time required for one employee to create the commentary table alone: 34.5 hours

    Our initial conclusion: there are some fundamental points that require revision. These include

    1. the "weighting" of time-dependent materials and the associated short-term verifications
    2. stepped trenches, which are sometimes controversial among experts: For "flexible" soil-pipe systems, incomplete
    3. bedding reaction pressure occasionally produces (presumably undesirable) results: Pipe ovalises upwards (!), contrary to the load
    4. Proof of buoyancy is missing
    5. References to other DWA regulations require the creator of the pipe static calculations to consult at least three sets of regulations (instead of one worksheet, the still valid ATV-DVWK-A 127)
    6. ZFSV (temporarily flowable, self-compacting backfill materials) were included; questionable meaningfulness for only one of many backfilling methods
    7. Overweight in the treatment of non-linear methods and second-order theory.

    The DWA working group will collect, collate and sort the objections. According to initial estimates, this processing step may take 1/2 - 1 year.

    Curious? Please contact us! We would be happy to discuss the pros and cons of the future DWA worksheet on trench installation of solid-wall pipes in a professional and lively manner.