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Repair of Damaged Membrane Surfaces

Date: 2022-03-26 Author: 科琦气膜

  在安装和使用过程中,膜结构的膜表面可能因各种原因而损坏或损坏,如膜表面处理过程中漏焊或焊缝脱落;安装过程中在地面或其他结构上被磨损、尖锐物体划伤或刺穿,以及吊装或张拉过程中意外撕裂;在使用过程中,坠落物破碎或人为损坏等情况,一旦发生,需要及时修复。

  根据膜表面损坏的具体情况,修理工作可分为以下几种方式:

  1.如果只有部分薄膜材料的表面涂层磨损,且基布的纤维完好,

  高性能透明粘合剂可用于在磨损区域粘贴或热封,如图9所示。

  2.如果膜表面的损伤范围长度小于50mm,则切割一块椭圆形或圆形膜布,并将其焊接在损伤区域作为加强层,如图10所示。

  3.如果膜表面的损伤范围大于50mm但小于300mm,则准备一条长度和宽度大于损伤范围150mm的膜条,并将其焊接在损伤区域的膜表面上,作为加强层。

  4.如果膜表面受损部分长度超过300mm,则应将整个受损单元拆除并运回工厂进行维修或更换。

  以上1~3例均在现场修复,具体修复方法取决于所用膜材料的类型。

  PVC涂层覆盖的膜材料可通过热风机进行修复;清理待修补区域,将其平放,将补片铺在待焊接表面上,用热风将膜表面的PVC涂层熔化,然后用小滚筒将补片和下膜压紧,使其牢固连接。图11显示了用于PVC膜材料现场维修的热风机。使用时,用锡纸将出风口做成鸭嘴状,以控制气流。图12显示了PVC膜材料从焊缝脱落的现场修复。

  对于PTFE涂层覆盖的薄膜,

  在贴片和原受损膜之间加一层FEP膜,如图13所示;然后用专用的手持式焊接设备(类似于烙铁,图14)将补片压紧,高温熔化FEP膜,然后将补片焊接在膜表面。图15显示了PTFE膜材料项目膜表面损伤的现场修复示例。

  在具体操作过程中,要注意掌握加热温度和加热时间,不仅要使待焊接薄膜材料的表面涂层或FEP膜充分熔化,使其牢固地粘在一起,还要防止薄膜材料因过热而燃烧。

  需要修复的补片通常位于外表面。在潮湿区域,应在内外表面焊接相同尺寸的补片,以防止因潮湿和霉变而污染修复区域。



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