| 摘要 |
A pre-cast reinforced concrete structural beam comprises an upstanding web (136) and at least an inwardly directed flange (138) at the base of the web, the face of the web which is innermost in use and/or the upper face of the flange having surface irregularities (236,140) formed therein into which a cast in situ floor slab can penetrate to form a mechanical lock with the beam.
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