| 摘要 |
A method of moulding long concrete articles in a vertical mould which incorporates a mould liner (17) with drainage tubes (5) used to dewater the concrete when the mould is filled. The improvement is to close off the drainage tubes (5) during the filling of the mould to inhibit water loss in the concrete during filling. The drainage tubes (5) may incorporate one way valves or include inner tubes (15) that may be pressurized to inhibit water entering the drainage tube (5).
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