Based on the image provided, it appears that a formwork failure occurred during the concrete pouring process. This happens when the temporary support structure (the wooden scaffolding and shuttering) is unable to handle the weight and pressure of the wet concrete, leading to a partial collapse.
​Several factors typically contribute to this kind of failure:
​1. Inadequate Shoring and Bracing
​The wooden supports (shores) seen in the image look disorganized and thin. If these supports are not vertically aligned, properly spaced, or braced horizontally to prevent swaying, they can buckle under the heavy load of fresh concrete.
​2. Overloading
​Wet concrete is extremely heavy (roughly 2,400 kg/m³). If too much concrete is poured into one section too quickly—or if it is piled up in one spot rather than being spread out—it can exceed the load-bearing capacity of the wooden forms.
​3. Poor Material Quality
​The timber used for the scaffolding appears to be rough-hewn poles. These are prone to hidden defects, knots, or rot, which can cause individual supports to snap, creating a "domino effect" that brings down an entire section of the slab.
​4. Lack of Stable Footing
​If the vertical poles were placed on soft or uneven ground without "sole plates" (flat wooden blocks to distribute weight), the weight of the concrete can push the poles into the mud, causing the formwork to tilt and collapse.
​5. Equipment Impact
​Sometimes the physical impact of a concrete bucket or the vibration from a mechanical vibrator (used to remove air bubbles) can provide the final bit of force needed to break a weak support system.
​Immediate Safety Note: This area is currently extremely dangerous. The remaining structure may be unstable, and the hardened "slumped" concrete will be much more difficult to remove later.
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