Helene and Albert Glass founded their building construction business in 1948. Today, Glass GmbH Bauunternehmung is being managed by the third generation of family owners. The Glass Group employs about 750 people at its operations in Mindelheim, Munich, Bad Wörishofen, Leipzig, and Berlin. The company headquarters and the precast plant are located on a 170,000 m² site in Mindelheim in the German Lower Allgäu region.
The group of companies includes Glass GmbH Bauunternehmung Mindelheim with a Munich subsidiary, Glass Ingenieurbau Leipzig GmbH with a Berlin subsidiary, Kreuzer GmbH & Co. KG Bauunternehmung in Bad Wörishofen, Glass GmbH & Co. Umwelttechnik KG, and Swiss Concrete GmbH.
Glass GmbH Bauunternehmung has a nationwide as well as European presence. Its activities cover all fields of construction, focusing on industrial, general building, turnkey projects, civil engineering, power stations, sewage treatment plants, and the complete range of activities in real estate. Another key part of the business is the construction of turnkey buildings for paper mills, particularly in other European countries. Furthermore, the company operates another precast plant in Türkheim, also in the Lower Allgäu region, specializing in the production of tunnel segments.
Glass continues to be dedicated to providing its customers with the proverbial “Swabian reliability” also in the coming years. To achieve this goal, the company hires 50 trainees per year and has implemented a comprehensive continuing training and development program for its employees.
According to the company, the Mindelheim precast plant is one of the most modern, highest-output operations in Southern Germany. It excels with its high level of integration, high quality standard, and on-time delivery and assembly – factors that shorten the construction phase and enable tailor-made solutions. The sophisticated range of precast elements has been certified to European and national standards.
Glass commissioned Avermann
Avermann Betonfertigteiltechnik GmbH & Co. KG was commissioned with modernizing and upgrading the production line. This contract included delivery of a stationary formwork unit for precast double-T roof and floor slabs to be installed on the existing 60 m long prestressing bed. This unit comprises a heavy-duty base frame with a central core whose width is adjustable by mechanical means, as well as two hydraulically operated side parts. The width of the core element can be set in a range from 1,000 to 1,350 mm.
Double-acting hydraulic cylinders ensure displacement of the side parts over the entire length of the prestressing bed. This arrangement results in a crosswise travel distance of about 875 mm at a web bottom width of approx. 200 mm. Synchronization is provided via mechanical shafts. Pressure is continuously applied to the hydraulic cylinders in order to ensure adherence of the form’s side elements to the floor. The scope of supply also includes a pressure controller unit. The form’s design eliminates the need for top bracing.
When deciding in favor of this new formwork system, Glass GmbH placed particular emphasis on effectively utilizing the form and shortening setup times. The parties involved in the project engaged in many discussions over a period of 1.5 years to agree on smart solutions and details that consistently meet these requirements.
Comprehensive contract scope
Specially profiled forms with integrated magnets supplied by B.T. innovation were used for the edge areas of the side surfaces. Thermal oil heating elements have been integrated in the webs in order to accelerate curing. Heat accumulation foils are suspended on the side parts to mitigate heat loss. The contract scope also included delivery of the complete hydraulic equipment, including controller units, and its assembly and commissioning.
64 Wacker AR54/6/250 vibrators were installed to ensure effective compaction. At the same time, Howal delivered a universal formwork system. Glass ordered the associated junction boxes, indicator lights, timer, system accessories, and inverter control unit directly from Wacker after close coordination with the suppliers, thus ensuring smooth and effortless commissioning.
Satisfied project stakeholders
All project stakeholders were exceedingly satisfied with the outcome: Thomas Strach, Sales Engineer at Avermann Betonfertigteiltechnik, highlighted the outstanding cooperation during the entire project, including initial contract-related discussions, delivery and assembly, and the smooth handling of the commissioning process.
Franz-Reiner Göhrle, Plant Manager at Glass GmbH Bauunternehmung, reiterated: “We are particularly pleased with the high performance of the Avermann equipment, which is set to render production of double-T slabs much more effective at the Mindelheim factory.”