Lampertheim stormwater retention basin: Resolving a complex shoring situation by combining LOGO.3 with supporting jacks
During the construction of a stormwater retention basin in Lampertheim, it was by combining PASCHAL supporting jacks with the LOGO.3 wall formwork that a single-sided formwork system was successfully accomplished under particularly difficult conditions: The bracing system for shoring up the excavation remained in place all through the formworking.
In the town of Lampertheim, just north of Strasbourg, an underground stormwater retention basin is currently being built for the Strasbourg Eurometropolis. This project will contribute significantly to storing and regulating stormwater in the future and is part of an ongoing modernisation of local infrastructure.
Construction experts GTM TP Est opted for a combination of PASCHAL supporting jacks and LOGO.3 wall formwork to build the reinforced concrete walls of the underground stormwater retention basin. The ultimate deciding factor for this choice was the complex shoring work inside the excavation pit.
Formworking of the stormwater retention basin, measuring 16 by 24 metres and with an average depth of 5.30 metres, was carried out between March and July 2026. In total, approximately 461 m² of formwork was used. The concreting took place in nine phases, during which approximately twelve linear metres of single-sided formwork were used.
Single-sided formwork with excavation shoring in place
The key challenge lay not so much in the dimensions of the structure as in the position of the existing retaining structure in the pit. Multi-walers and spacers were used for the bracing system in the pit, significantly restricting the amount of room available for construction and formworking. As a result, the entire formwork design – from the LOGO.3 components and supporting jacks to the Multip working platforms – had to be meticulously adapted to the on-site conditions. Maintaining the necessary stability, the precision dimensions and quality of execution at all times was equally crucial.
Planning down to the last centimetre with PASCHAL-Plan pro
Layout of the LOGO.3 formwork panels was designed so that the various formwork panels could be integrated seamlessly into the existing shoring system. In the deepest sections, the formwork was installed and the tie rods were secured to the shoring structure. This meant that the existing bracing system could be incorporated into the formwork design, without the need for additional and costly alterations to the shoring.
The modular design of the LOGO.3 played a decisive role in this respect. The formwork panels fitted with supporting jacks were designed for use without any dismantling and reassembly being necessary, from the second concreting phase to the ninth. This greatly reduced not only the number of reconfiguration operations, but also the downtime between the various phases of the cycle. As a result, the pace of work on site was considerably speeded up.
Another practical advantage was that the formwork was stabilised using a single type of supporting jack. This led to a simplification of the material management and made on-site handling operations easier.
Safety at work was also integrated into the formwork design right from the outset. The Multip platform was used in combination with Secuset side railing posts to provide rear protection, ensuring workplace safety at the formwork units while also eliminating the need for the customer to source additional equipment
Technical expertise and a close relationship with the customer: two keys to success
Municipal public works and civil engineering projects are often confronted by complex site conditions, forbidding challenges in terms of workmanship quality, and tight completion deadlines. PASCHAL did not simply act as a system supplier, they were also fully engaged in the execution of the project as a global partner.
Apart from the technical solution, the customer greatly appreciated the responsiveness of the PASCHAL team and the close collaboration they maintained all through the project. The combination of technical expertise, practical planning, reliable logistics and direct support on-site played a key role in the success of this complex formwork project.
LOGO.3 and supporting jacks: The ideal combination for challenging single-sided formwork
Complex installation conditions are frequently part of everyday operations at municipal public works and civil engineering sites. The Lampertheim stormwater retention basin demonstrates that, with the right formwork solution, even the most demanding technical challenges can be overcome. The key factor lies not only in high-performance systems, but also in how these are adapted precisely to existing conditions.
By combining the LOGO.3 wall formwork system with supporting jacks and a design tailored to the site conditions, a solution was devised that takes into ac-count technical challenges, work safety, and construction process efficiency all at once.
The formwork for the Lampertheim stormwater retention basin presented particularly challenging technical constraints relating to the multi-walers and spacers. Thanks to PASCHAL's LOGO.3 wall formwork system, in combination with supporting jacks, this complex configuration was implemented safely and cost-effectively.
