In contrast, flexible pipes (plastic pipes) yield to vertical loads by deformation. This results in not only vertical but also horizontal deformation (elliptical deformation figure). This deformation activates a lateral bedding reaction of the soil (additional parabolic stress distribution), which is thus called upon to partially bear the loads. In this case, the flexible pipe and the soil jointly bear the external loads. These bedding reactions …

In contrast, flexible pipes (plastic pipes) yield to vertical loads by deformation. This results in not only vertical but also horizontal deformation (elliptical deformation figure). This deformation activates a lateral bedding reaction of the soil (additional parabolic stress distribution), which is thus called upon to partially bear the loads. In this case, the flexible pipe and the soil jointly bear the external loads. These bedding reactions …

In the following, the creation of the lower bedding layer is shown using the example of a concrete pipe with base. Pipes with base are usually placed on a prepared, horizontally levelled and compacted bedding of suitable soil material, directly on the prepared trench base. Even in the case of pipes with base, it is necessary to re-compact the edge areas at the base with a hand tamper to ensure full-surface support.

(Image: Preparation of the lower …

In the following, the creation of the lower bedding layer is shown using the example of a concrete pipe with base. Pipes with base are usually placed on a prepared, horizontally levelled and compacted bedding of suitable soil material, directly on the prepared trench base. Even in the case of pipes with base, it is necessary to re-compact the edge areas at the base with a hand tamper to ensure full-surface support.

(Image: Preparation of the lower …

Hydraulically bound backfill materials are particularly suitable for the combined installation of pipes and sewers. With conventional installation of pipelines, sufficient minimum distances are required for the necessary compaction of the soil. These are not required when installing the pipes with hydraulically bound backfill materials.

The following pictures show a corresponding application. Reinforced concrete elements are used as installation aids. …

Modern alignment of jacking spans poses constantly increasing requirements for jacking pipes. Looking back to recent years, it is apparent that jacking lengths are getting longer and longer while narrow curves are becoming more and more frequent. Even complicated curve combinations, partly with multiple S- or three-dimensional curves, are no longer a rare sight in calls for tenders.

Conventional pipe joints with pressure transfer rings made of wood …