| 摘要 |
The concrete wall reinforcement has two walls formed by steel frames and extending in parallel, being spaced by tie rods (4,5). One of the walls has two independent grids, one (2A) connected with the other wall by first tie rods (4) and the other (2b) connected to the other wall by second tie rods (5) independent of the first. When the grids are moved in opposite directions parallel to the grates, the spacing between the walls alters.
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