|转至：输配电线路
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▲图 拉线棒露出地面长度过长案例图
2.典型问题解析
（1）拉线棒安装时未挖斜坡（马道），拉线与拉线棒受力不在 一条直线上，易使拉线棒受力弯曲。
（2）拉线棒露出地面过长、拉盘埋设不足，拉盘承受上拔力达 不到设计要求，影响电杆稳定。
（3）回填土不设防沉土台，自然密实后出现凹坑，且倒截锥土 体重力不足影响抗拔力。
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3.标准工艺要点
(1)拉线坑应挖斜坡（马道），回填土应有防沉土台。使拉线棒 与拉线成一条直线。(2)拉线盘装设，拉线棒应沿 45 °马道方向埋设，拉线棒受力后 不应弯曲。承力拉线与线路方向的中心线对应，拉线棒不得弯曲。(3)拉线棒外露地面长度一般为 500mm～700mm。
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▲图 拉线棒露出地面长度、拉线安装角度与拉线盘正确安装标准示意图
1.典型问题图例
▲ 图 拉线 UT 线夹施工工艺不规范案例图
2.典型问题解析
（1）钢绞线在 UT 型线夹舌板回转部分松股；拉线的各股线受力 不均，影响钢绞线机械性能。（2）螺杆丝扣在紧固后露出过短，易导致线夹变形、松动甚至 脱落；拉线无法调整，螺母易脱落等问题。..................................................
3.标准工艺要点
(1)线夹舌板与拉线应吻合紧密，受力后应无滑动现象，并不应 有松股现象。
(2)UT 型线夹的螺杆应露扣，并应有不小于 1/2 螺杆丝扣长度 可供调紧。调整后，UT 型线夹的双螺母应并紧。
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▲图 拉线 UT 线夹舌板与拉线紧密贴合示意图
▲图 拉线 UT 线夹螺母安装与外露丝扣长度示意图
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1.典型问题图例
▲图 拉线与电杆夹角过小案例图
2.典型问题解析
拉线与电杆夹角过小、过大，导致拉线受力不平衡，电杆易倾斜。
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拉线与电杆夹角宜成 45 ° , 当受地形限制可适当调整，且不小 于 30 °、不大于 60 °。 ..................................................
1.典型问题图例
▲图 拉线抱箍安装位置错误案例图
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2.典型问题解析
拉线抱箍安装在横担下方或上方，紧贴横担，易产生感应电流或 在绝缘子击穿时导致电流接地，造成人身等伤害。 ..................................................
拉线抱箍一般装设在相对应的横担下方，距横担中心线 100mm处。
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专栏：行业资讯
作者：
行业资讯
来源：
行业资讯
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