| 摘要 |
A wire used in the wire cage of chemically prestressed concrete pipe is effective to restrain the expansion of expansion concrete over a wide range and with a uniform stress during the manufacture of the pipe. The plane of the wire which applies stress to the concrete is approximately straight or mildly curved in section, its width being larger than the diameter of a circular wire having the same cross sectional area and its thickness being smaller than said diameter. The plane which acts on the concrete is provided with projections for spot welding in the formation of the wire cage.
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