管采用热熔对焊连接或电熔套管连接。
HDPE pipe to connect the use of hot-melt or fused welded casing connection.
端面有间隙、带凸台对接外形是指在标准节上部主弦杆上焊有定位凸台，定位凸台伸人另一标准节主弦杆内，上、下套管之间留有一定间隙配合定位。
End face with a gap, no boss butt is refers to the upper and lower casing left a certain gap between the upper and lower main chord rod end face at the same time contact.
简要介绍了直缝焊套管国内外使用情况，生产技术以及国内外生产现状，目前正在进行的一些试验研究工作。
It is introduced in brief that the domestic and foreign employed situation of straight welded casing, manufacture technology and production condition, and some researches being done at present.
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