| 摘要 |
The composite sheet (4) is made up of three layers, a first flat water-retaining layer (1), a second corrugated layer (2) and a third thin ground-retaining layer (3). These act as left-in formwork for casting reinforced concrete piles in the space (21) formed at intervals between the thin and corrugated layers.The third layer can be placed against the second corrugated layer for stocking and transporting. The third layer is fixed to the second layer in the user position, with each half projecting corrugation (7) covering one and a half corrugations (8-10) of the second layer.
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