{"id":19706,"date":"2025-12-09T14:16:54","date_gmt":"2025-12-09T13:16:54","guid":{"rendered":"https:\/\/www.darda.de\/?page_id=19706"},"modified":"2025-12-09T14:16:54","modified_gmt":"2025-12-09T13:16:54","slug":"formwork","status":"publish","type":"page","link":"https:\/\/www.darda.de\/en\/knowledge\/formwork","title":{"rendered":"Formwork"},"content":{"rendered":"
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Formwork shapes fresh concrete into load-bearing structural elements and determines surface finish, dimensional accuracy, and construction quality. It combines construction operations planning with craft precision and influences the later deconstruction. Wherever components must be adjusted, opened, or selectively removed, formwork technology meets material-conserving concrete demolition methods \u2014 for example with concrete demolition shears<\/strong> or rock and concrete splitters<\/a> from Darda GmbH.<\/p>\n

Definition: What is meant by formwork<\/h2>\n

Formwork refers to a temporary or stay-in-place mold<\/strong> for fresh concrete. It consists of form facing, load-bearing members, and bracing; is secured with ties and tie points against fresh concrete pressure<\/em>; and reproduces the geometry of the future element. Formwork is used for cast-in-place concrete, for precast connections, and for exposed concrete. After hardening, the forms are stripped; stay-in-place formwork remains as part of the element.<\/p>\n

Basics, components, and functionality of formwork<\/h2>\n

The form facing governs surface quality, the falsework transfers loads into the ground, and the tie system holds the form against pressure and uplift. Seals and joint tapes prevent cement paste loss; blockouts create openings and penetrations. During concreting, time, temperature, consistency, and placement height affect fresh concrete pressure. Planning and execution aim to limit deformations, achieve the specified surface, and prepare for safe stripping. For corrections, for example at protrusions or defects, precise removal and separation methods are used \u2014 preferably low-vibration<\/strong> and low-dust<\/em>.<\/p>\n

Configuration and components of a formwork system<\/h2>\n

Formwork consists of functionally coordinated elements. The selection of materials (timber, wood-based panels, steel, aluminum, fiber-reinforced panels) depends on surface requirements, reuse, and economy. Load paths and supports must be planned just as carefully as tie layout and stripping sequence.<\/p>\n

Form facing and falsework<\/h3>\n

The form facing determines porosity, texture, and flatness. Girders, yokes, and props form the falsework and carry self-weight, fresh concrete pressure, and site loads. For slab formwork, deflection limits are critical to avoid rework.<\/p>\n

Ties and bracing<\/h3>\n

Ties transfer tensile forces, keep form faces at a set distance, and define the member thickness. Bracing and struts secure against overturning and sliding. After stripping, tie holes are closed; the quality of exposed surfaces depends on careful execution.<\/p>\n

Blockouts and embedded parts<\/h3>\n

Blockouts, sleeves, embedded items, and brackets must be fixed accurately in position. Tightness and dimensional accuracy prevent rework. For subsequent openings in existing elements, a crack-and-split method<\/strong> using rock and concrete splitters offers a low-vibration alternative to percussive removal.<\/p>\n

Types of formwork and typical applications<\/h2>\n

Different types of formwork are used depending on the element and construction method. The goal is safe, economical, and quality-compliant production \u2014 from the foundation to the free-spanning slab and from the wall to the tunnel vault.<\/p>\n