Structural analysis

We focus on statics for pipes and manholes

iro 2023: IngSoft at the Oldenburg Pipe Forum

From 30 to 31 March 2023, IngSoft will be attending the 35th Oldenburg Pipe Forum


Presentation on HDD at the PTC

IngSoft will be speaking at the 18th PTC on 10 May 2023 in Berlin.


Worksheet DWA-A 127-1 "Fundamentals" (with restrictions) published

Worksheet DWA-A 127-1 - Structural analysis of drainage systems - Part 1: Fundamentals - December 2022 in the DWA Shop

Home Engineering services: Structural design, FEM

We combine engineering, work and service

Since 1997 we are offering pipe statics as a service. As our client, you are in direct contact with the engineer - your personal contact person. This ensures short information paths and smooth processes. Satisfied regular customers appreciate the transparent pricing and high adherence to schedule.


Our employees are civil engineers who regularly undergo further training. We actively participate in the standardization work at DWA DIN/CEN and GSTT. All in all, we really concentrate on pipe statics.

Committee work

We extend our software

Our software IngSoft EasyPipe is best suited for standard situations. Special materials, irregular cross sections and small cover depths require additional considerations in the pipe statics. Our structural engineering starts where the standards cease.

Do you wish to receive an offer for your project?

Contact us!

Our expertise

Materials play an important role in statics. We consider time-dependent material properties in accordance with the "state of the art".

We know how to safely handle:

  • Concrete/reinforced concrete
  • Stoneware
  • GRP (Glass-Reinforced Plastic)
  • Ther­mo­plas­tics such as PP-B, PP-H, PVC-U, PP-R and PE-HD
  • Duroplasts
  • Steel
  • Polymer concrete

Do you want to use a special material? Thanks to our experience with powerful programs many things are possible.

Get in touch with us

  • Solid wall pipes/ducts/molded components
  • Profiled pipes, winding pipes, wave profiles, hollow profiles
  • Perforated cross-sections
  • Wall-reinforced and base-reinforced pipes
  • Egg-shaped sections as standard egg-shaped profile, oblong or constricted egg shape
  • SDR (Standard Dimensional Ratio)
  • Mouth-shaped cross sections, jaw profiles, dragon-shaped profiles, hood profiles
  • Large profiles
  • Rectangular and box profiles
  • Dry weather drains and channels

Some of them are standardized; others demand a deep understanding of standards, careful planning and a preceding load calculation.

Static loads

  • HGV 60, HGV 30 (Heavy Goods Vehicle, standardized vehicles according to DIN-Fachbericht 101 ("DIN Technical Report 101") or ATV-DVWK-A 127)
  • LM 1 or Loadmodel 1 in road traffic according to DIN EN 1991-2
  • LM 71 or load model 71 in rail transport, single or multiple track, successor of the UIC 71
  • Load calculation for special vehicles such as forklifts, cranes, Boeing 747 and Airbus A340/A380 aircraft via footprint (Landing Gear Footprint)

Dynamic loads and load ranges

In the "proof against non-predominantly static load", we investigate the behavior of the components under alternating stresses. The proof depends on the set of rules and the load. Common values in the fatigue analysis are:

  • Cycles-to-failure 2x106: Specified in ATV-DVWK-A 127:2000 and there for the UIC 71
  • Cycles-to-failure 1x108: For jacking pipes specified in DWA-A 161:2014 for the first time and there for the LM 71
  • We consider any deviating values notified to us by you as the builder

Depending on the material, we assign a permissible stress double amplitude to each of these load cycles.

We know and take into account all the rules and regulations that we consider relevant for underground pipes, manholes/shafts and similar components.

  • ATV-DVWK/DWA: Deutsche Vereinigung für Wasserwirtschaft, Abwasser und Abfall e. V. (German Association for Water, Wastewater and Waste) (DWA), Hennef
    We are a member and partner of DWA
    Website: ATV-DVWK/DWA
  • DIN e.V.: German Institute for Standardization, Berlin
    Website: DIN
  • Deutsche Bahn AG: RIL 836 - Erdbauwerke planen, bauen und instandhalten ("Earth structures - Planning, constructing and maintaining")
  • Eurocodes / EC: European standardization for impacts, individual proofs
    Website: Eu­ro­codes / EC
  • SIA: Swiss Association of Engineers and Architects
    Website: SIA
  • AWWA: American Water Works Association, e.g. AWWA M45
    Website: AWWA

We also apply related standards such as Fascicule or CIRIA.

If your requirements exceed the usual standards, we will solve this together: We considered, for example, the Basel light rail and the Potsdam trolley car and crane cantilevers. For port authorities, we designed a Noell gantry crane, Kalmar reachstacker and fire trucks.

We have successfully demonstrated cable ducts in numerous construction projects:

  • Cable duct package consisting of a total of 38 pipes from DN 150 in several rows and layers, asymmetrically embedded, installation directly in the road structure
  • Underground cable protection pipes (Kabelschutzrohre, KSR) as railway crossings
  • Statics for KG 2000 pipes as cable bundle of a transformer station
  • Pipe static calculations for cable protection systems
  • Structural analysis per FEM for spiral hoses installed in a bundle with close spacing and large cover depth

Putting all of this together...

... you get a variety of options for combining material and geometry.

We have modeled, calculated, interpreted and evaluated:

  • Tangential manholes
  • Openings, unions, conneciton pieces, outlets
  • Branches and inlets of pipes
  • Cone with mounted ribs
  • Welded joints
  • Pipe packages/bundles and cable bundles (several pipe strings are laid side by side and/or one above the other)
  • Line routes under runways at airports
  • Crossings and passages in the area under the control of the DB (German Railway)
  • Special molded components
  • Short pipe relining for large profiles for renovation in all Host Pipe Conditions (HPC I to HPC III)

To this end, we use the Finite Element Method, in short: FEM. We will agree with you on a suitable model, which we then examine in three dimensions, if desired and appropriate. Our engineers will evaluate these 3D FEM calculations for you. In doing so, we document the results completely and comprehensibly in a verifiable report.

We are happy to receive your request.

Get in touch with us!

How is a structural calculation done at IngSoft?

  • You want a project-related "Statics" and inquire with us
  • We inspect your documents*)
  • We prepare a non-binding offer for you and specify a delivery date
  • You place the order with us in writing
  • We promptly process your project and send you our verifiable report
  • You pay for our services

*) The details we need exactly depends on your project. Our staff will gladly assist you in selecting "relevant" documents.