Publications in professional journals and lectures
We obtain a great deal of information from the professional world through articles in journals and committee work. With our articles, we stimulate knowledge transfer and discussion.
Soil pressures and load propagation under tandem vehicle LM 1
Dipl.-Ing. (FH) Frederik Müller, IngSoft GmbH, Nuremberg -|- The widely used approach of equivalent surface loads from road traffic for underground pipelines and manhole structures will be replaced in the foreseeable future: It will be replaced by the load models of DIN Technical Report 101 for bridges, which focuses on individual wheel loads. The SLW 60 according to DIN 1072 and the load model1 according to DIN Technical Report 101 are compared. An exemplary investigation of the soil pressures and the load propagation for load model 1 is carried out -|- Published in the journal 3R
Rehabilitation of large profiles lacking long-term stability
Dr.-Ing. Dietmar Beckmann, Dr.-Ing. Heinz Doll and Dipl.-Ing. Vladimir Lacmanović -|-The large wastewater collectors, which are mainly laid under public roads, have often been in operation for over 100 years and are made of masonry or tamped concrete and often show such serious damage that their long-term stability no longer appears to be guaranteed. As an alternative to renewal, various renovation methods are also available for large sections, which offer significant advantages in terms of investment costs, environmental protection and urban pollution.
Depending on the process, the extension of the service life achieved can be equivalent to that of a renewal. The prerequisite is a detailed investigation of the actual stability or residual load-bearing capacity of the existing sewer and a needs-based selection and dimensioning of the rehabilitation method. Part 1 of this technical report (3R issue 1-2/2016) was dedicated to the condition assessment and rehabilitation methods. Part 2 deals in detail with the new worksheet DWA-A 143-2, which provides a good basis for the necessary structural calculations. -|- Published in the magazine 3R
Structural analysis of PE-HD pipes according to ATV-DVWK-A 127
Dipl.-Ing. Frederik Müller, Dipl.-Ing. Stephan Füllgrabe -|- For the static calculation of buried pipes, there are various regulations available on an international level. The publica-tions of AWWA, SIA and DWA (formerly ATV-DVWK) are important for pipe statics. This article describes the basic procedure for the dimensioning of profiled pipes using the ATV-DVWK-A 127 (Germany) worksheet, as this set of rules also enjoys great international recognition. -|- Published in the journal IMPROFIL
Stability of underground cable protection conduits in bundles
Dipl.-Ing. Vladimir Lacmanovic, Dipl.-Ing. Frederik Müller -|- Electrical cables, fiber optic cables and other sensitive components of modern infrastructure are often laid in protective pipes in the ground. The protective role is usually played by plastic pipes made of polyethylene (PE), polypropylene (PP) or polyvinyl chloride (PVC). The optimum wall thickness required for the cost-effectiveness and stability of these pipes can be determined using static calculations. A special feature here is the dimensioning of several pipes as a package or cable bundle. -|- Published in the journal SUBSTANZ
Other publications:
- Calculul static al conductelor îngropate, conform fișei de lucru ATV-DVWK-A 127 (ROMAN) (pdf) 654 KB
Diplomat Inginer (Universitatea din Belgrade) Vladimir LACMANOVIĆ, IngSoft GmbH -|-. Pentru calculul static al conductelor îngropate, există diferite reglementări disponibile la nivel internațional. Acest articol descrie procedura de bază pentru dimensionarea țevilor profilate cu ajutorul fișei de lucru ATV-DVWK-A 127 (Germania), deoarece acest set de reguli naționale beneficiază, de asemenea, de o largă recunoaștere internațională. Calculation modules for installation in trenches according to ATV-DVWK-A 127 -|-. Published in trenchlessromania spring 2020, p. 24f.
Diplomat Inginer (Universitatea din Belgrade) Vladimir LACMANOVIĆ, IngSoft GmbH -|-. Există multe motive pentru a utiliza metodele minim invazive trenchless pentru a instala conducte în subteran: nicio deplasare a solului, nicio distrugere a drumului ce ar implica o perturbare majoră a traficului, afectare minimă a zonelor rezidențiale, conservarea mediului și multe altele. Calculation modules for trenchless installation according to DWA-A 161 and DWA-A 143-2 -|-. Published in trenchlessromania November 2019, p. 30f.
Dr.-Ing. Dietmar Beckmann, S & P Consult GmbH, Bochum Dipl.-Ing. (Univ. Belgrade) Vladimir Lacmanović, IngSoft GmbH, Nuremberg -|- Until now, the static calculation of liners in non-permanently stable channels with eiquerschnitt could only be performed with very complex and expensive FEM analyses for each individual case. Now a new reliable calculation method is available, which is based on a specially developed bar model and can be automated for convenient operation. -|- Published in the special edition Sewer and Pipeline Construction - Construction and Rehabilitation by Ernst & Sohn-Special
Jacques Kohler and Dr.-Ing. Dietmar Beckmann -|-. For the rehabilitation of sewers and pipelines that are no longer permanently stable (old pipe condition III) using lining and installation methods, the preparation of a single structural analysis is usually not sufficient. Particularly in the case of changing cover heights and/or a fluctuating groundwater level, it is not possible to estimate in advance without more precise calculations which combinations of effects will lead to the greatest stresses on the liner and the old pipe. In addition, any annular gap between the liner and the old pipe can have either a favorable or an unfavorable effect. For this reason, this technical report presents a systematic verification concept for the old pipe condition III, which is already integrated in the new M127-2 calculation module of the IngSoft EasyPipe software. -|- Published in the journal 3R
Dipl.-Ing. (FH) Frederik Müller, IngSoft GmbH, Nuremberg -|-. The consideration of loads outside the common standards poses challenges to the preparers of static calculations for buried pipelines, manholes and civil engineering measures. It is investigated whether the design airplane loads (ASL) defined in 1970 cover the loads from current passenger aircraft (Boeing 747, Airbus A340, A380). -|- Published in the Ernst & Sohn-Special Sewer and Pipeline Construction - Construction and Rehabilitation.
- Notes on the 3rd edition of ATV-DVWK-A 127 and the static calculation of buried pressure pipes (pdf) 732 KB
Karsten Reese and Ulrich Wallmann -|- The 3rd edition of the ATV-DVWK worksheet A 127 (static calculation of sewers and pipes) contains some obvious changes. In practical application, this results in additional implications that are not explicitly mentioned in the worksheet: For example, the use of material parameters obtained from long-term or short-term values weighted in the ratio of earth loads to live loads forces separate stress verifications to be carried out for the individual load cases. -|- Published in the journal 3R