| 摘要 |
<p>Abstract Trench formwork consists of L-shaped, hollow body units, preferably made from a plastic material. The units have openings in their top into which flowable material such as concrete may be poured. Upon curing, the formwork becomes similar to precast concrete trench formwork. 22 Fi.126 12 -- 224 20 20 24 Fig. 3FFig.2 28 .. 26 28..28</p> |
