| 摘要 |
The invention relates to a concrete spraying machine which operates by the thin-stream process, in the case of which machine the sealing between the charging part (1 + 2 + 3) and the compressed-air delivery part (12 + 13 + 15) is effected only by a concrete plug (11) whose length is set automatically and constantly corrected, as a function of the respective concrete composition, by an electronic computer (6). <IMAGE>
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