Three construction sites, one system
Mammut XT convinces building professionals with its flexible tie hole and practical advantages.
Data & Facts
- 1. Day nursery, Hannover, Germany
- 2. Household waste recycling centre, Tübingen, Germany
- 3. Sports hall, Bridel, Luxembourg
- 1. Wilhelm Wallbrecht GmbH & Co. KG
- 2. Reiner Schädler Bauunternehmungen GmbH
- 3. SOLID S.A.
- MEVA System
- Mammut XT wall formwork
- Engineering and support
- MEVA Schalungs-Systeme GmbH, Hannover, Haiterbachand Stuttgart offices
Efficient accessory systems
Like all other sectors, theconstruction industry strives to progress and innovate. Planning instruments, materials as well as tools are being constantly improved and modernized. The objective is mainly to increase efficiency and reduce potential errors to a minimum. Shorter working distances and fewer parts are required, making single-sided tying a key issue in concrete construction. However, not only do construction sites vary greatly, their individual requirements are also very different. Hence the need to remain flexible.
The new Mammut XT wall formwork system with the integrated combination tie hole unites three tying methods in one system. The latest version of the first large-area wall formwork with a fresh-concrete pressure capacity of 100 kN/m² convinces the end user through its integrated tie hole and a great many other benefits.
A large number of construction sites in Germany and abroad had already used MEVA formwork successfully. With its own working group, Wilhelm Wallbrecht GmbH & Co. KG, for example, tested wall formwork systems from various manufacturers which allow flexible single- and two-sided tying. The group was made up of ten members of staff and spent about two years looking into new wall formwork systems.
Day nurseries with complex floor plans
Mammut XT was also put through its paces during the construction of two day nurseries in the Hannover region. The building with a T-shaped floor plan required a practical solution for the numerous corner areas. “With the flexible tie hole we were able to easily adapt our formwork to suit the different areas of the building and thus save material and working hours at the same time,” Jürgen Schönfeld, the foreman responsible for the project at Wallbrecht, is happy to say. He explained that single-sided tying was often employed, but in order to thoroughly test the formwork, two-sided tying was also tried out, including in corner areas.
Changeover between single- and two-sided tying
The Mammut XT panels with widths of 50 and 75 cm not only have a central tie hole but also tie holes in the frame to allow two-sided tying in the corner area. This method makes use of additional alignment rails superfluous, for example. Furthermore, all wall thicknesses can be formed in 5 cm increments with only three outside and two inside corners. “That was a clear advantage for us,” said Schönfeld, “and the changeover from single- to two-sided tying really can be done in next to no time.”
Three tying methods
The patented Mammut XT tie hole enables the internal body to be rotated with a flick of the wrist so that one can choose between three tying methods: single-sided tying with the XT taper tie without plastic tube; single-sided tying with XT tie rod DW 20 and plastic tube; and two-sided tying with tie rod DW 20 and plastic tube. Hence, it is not necessary to modify the formwork to switch between single-sided tying and two-sided tying. This allows every panel to be used flexibly as initial or final formwork.
Decision for Mammut XT
The extensive test phase enabled the construction company to try out the formwork in a real-life application to ensure that the correct decision was made. “The combination tie hole is practical, but we were worried that it would be quickly soiled with concrete and thus jam,” explained Christoph Nowacki, planning engineer and head of the working group at Wilhelm Wallbrecht GmbH & Co. KG. “However, that didn’t occur even once during the whole time, thus allowing us to choose Mammut XT with a clear conscience.”
Household waste recycling centre with long walls
During the construction of the household waste recycling centre in Tübingen, Reiner Schädler Bauunternehmung GmbH also worked with Mammut XT. At this site mainly long walls with heights up to 6 metres were planned for the work and storage areas. “As a lot of walls have the same thickness, we were able to simply adjust our XT taper ties to the required length at the beginning and use them everywhere without having to take measurements every time they were used,” praised Dieter Dorsch, the site manager responsible.
XT taper tie reduces measuring work
MEVA’s XT taper tie allows single-sided tying without using plastic tubes. The length is determined by moving the spacers on the rod to the corresponding position where they are secured. These are secured with a rivet and thus cannot be lost. “Every tying position costs time and money. With the XT taper tie we can work faster, require no plastic tubes, and the oiled tie rod can be removed regardless,” explained Dorsch and added: “Our next project is a large multi-family house. The requirements of these projects vary greatly. However, the Mammut XT is versatile and its advantages have convinced us.”
High walls requiring an architectural-concrete finish
North of Luxembourg City in the small town of Bridel, the Mammut XT wall formwork was able to realize its full potential during the construction of a sports hall with 10-metre high concrete walls. Thanks to the large 3.50 x 2.50 m panels, the wall height was achieved using only three formwork panels. “The internal tie holes result in an orderly, symmetrical anchor pattern and the alkus all-plastic facing delivers a very good concrete finish. We are thus able to deliver high quality with comparatively little effort. Reworking the concrete was reduced to a minimum,” said Simon Pint, the site manager responsible at SOLID S.A. “Forming the sharp-edged corners required here is no longer a problem using the new corner panels.”
Efficient accessory systems
The high formwork at a height above 6 metres was supported with Triplex R props. Accessories such as walkway brackets, self-locking tie rod holders and assembly locks remain attached to the formwork during relocation. This simplifies the logistics at the construction site because the parts do not have to be stored, transported or searched for separately. “These detailed solutions were well received by our team,” explained Mr Pint. “We hence save the time needed to search for and transport separate parts. Using Mammut XT, we can tie flexibly, achieve good results and, thanks to the clever accessory systems, work very efficiently.”