| 摘要 |
<p>A plug closes a gap between to upright concrete shuttering panels. The plug consists essentially of a rod with longitudinal radial ridges, each of different width and located between two battens (11a, 11b). The rod and battens are presented to the gap and the rod rotated until the right match is found between ridge and gap. The ridge is inserted in the gap, which is then finally closed by clamps applied behind the gap and straddling the rod. The rod is fabricated e.g. of extruded aluminium.</p> |
