工程机械及构造设计--QTZ1250塔式起重机起重臂设计_论文 关键词：臂架， 拉杆，斜腹杆， 上弦杆， 下弦杆 [gap=1050]Keywords: arm, draw bars, oblique abdomen, upper chord, lower chord.
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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.
端面有间隙、无凸台对接是指在上、下套管之间留有一定间隙，上、下主弦杆端面同时接触对接。
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.
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。
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