| 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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