发明名称 |
PROCESS AND APPARATUS FOR MANUFACTURING SINGLE PIECE RAILROAD TIES OF PRESTRESSED CONCRETE |
摘要 |
<p>A process and apparatus are disclosed for production casting of railroad ties and the like to obtain maximum mold utility. The casting is accomplished by arranging tendons within a mold and subjecting them to an appropriate tensile stress. Uncured concrete is then introduced at a temperature of around 80.degree.C - 90.degree.C. The mold is vibrated and subsequently closed. It is then maintained at 60.degree.C 80.degree.C for a time sufficient to cure the concrete such that the prestressing mechnism can be released. The mold may then be immediately re-used. One mechanism by which the molds may be closed during the curing process in a most efficient manner is to employ succeeding molds in a stacked arrangement to cover each preceding mold cavity. A single piece conical locking member is also employed to anchor the tendon in the mold.</p> |
申请公布号 |
CA1114587(A) |
申请公布日期 |
1981.12.22 |
申请号 |
CA19780301150 |
申请日期 |
1978.04.14 |
申请人 |
VIANINI, S.P.A. |
发明人 |
MARCHESI, SERGIO;FACHIN, GINO |
分类号 |
B28B21/60;B28B21/78;(IPC1-7):28B21/60;28B21/78 |
主分类号 |
B28B21/60 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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