E+S LINEAR SHORING: SEWER REHABILITATION WORK IN LEIPZIG

In the summer of 2020, REIF Baugesellschaft mbH & Co. KG, Schkeuditz, carried out the work for the third construction phase of the remedial works on the existing combined sewers on behalf of the Leipzig Waterworks. The main components of the project included the construction of a storage sewer with bottom discharge. Contrary to the original planning, which envisaged a construction pit secured with a soldier pile wall and the construction of the relief structure as a monolithic structure in cast-in-situ concrete, the construction partners ultimately decided in favour of a construction made of semi-finished parts in a panel construction method for the execution. Filtering cartridge linear shoring was used for the safety fuse of the approximately 13-metre-long, 8-metre-wide and 8.5-metre-deep excavation pit. This decision paid off, and not only with a view to the enormous dimensions of the excavation pit: after attaching a longitudinal outside waler and a base stiffening of the carrier pairs, two carriages could be pulled out of the shoring complete. This created the spatial pre-conditions on the site for the smooth assembly of the large-format precast concrete parts of the relief structure.

The relief structure measures 9.70 metres in length from inlet to outlet and 6.30 metres in width. The chamber height is 4 metres from the foundation layer to the upper edge of the covering plate. E+S linear shoring was able to demonstrate its advantages when it came to the safety of the construction pit. The system's design features allow it to be used even with very large trench depths. In addition, the ground outside the construction pit remains largely untouched. Even when buildings are close to the trench, there is little subsidence.

In addition, with a few simple technical additions, such as bracing, Linear shoring can also be used to create enormous working areas, for example for installing large components such as pipes with large nominal diameters, tanks, shaft structures or – as in Leipzig – for large-format precast concrete elements. A total of four modules of the shoring system were installed for the safety fuse / safety device of the excavation pit.

The civil engineering work was completed on schedule in December 2020. Despite the unusual conditions, such as the depth of the excavation, the heavy prefabricated parts and the large-dimensioned tubes/pipes, the construction partners were very satisfied with the way the construction project went.