久久久久久亚洲,伊人久久综合无码成人网,人妻丰满熟AV无码区HD,免费男人和女人牲交视频全黄

Spiral Duct Sales Hotline:0757-8679-7137

What should be paid attention to when making and installing the spiral duct support?

  • Hits: 1098

As we all know, the spiral air duct is now widely used in the interior of the building. Its main function is to have excellent ventilation and ventilation effect together with the internal and external ends of the building. In the process of spiral air duct installation, a bracket needs to be installed to support and assist. What should we pay attention to when making and installing the spiral air duct?




What should be paid attention to when making and installing the spiral duct support?

I. in the process of making the bracket, it is required to strictly follow the national standards, select the section steel specification specified in the drawing set, and it is not allowed to change it at will.

II. All bolt holes on the air duct support shall be drilled, and gas welding method shall not be used to open holes.

III. the blanking of hanger shall be accurate. In addition, there shall be no lap weld in the middle of hanger.

IV. when the cross section of spiral air duct is small, the air duct suspender can be fixed on the floor with expansion bolts. When the air duct is large, the drilling shall be carried out in a certain way.

V. before installing the support, the center line of the air duct shall pop up the wall, column and floor surface, and then pay attention to the horizontal position and standard height of the support, in order to ensure the levelness and plane center position of the installed air duct

Vi. before the installation of bracket, the exposed part shall be derusted and painted with antirust paint.

VII. For low air duct, in order to prevent cold bridge, the contact surface between air duct and support shall be padded with wood block or wood block.

VIII. When the steel members are pre arranged on the walls and columns, the position and elevation of the steel members shall be checked before the concrete pouring of civil works.

QQ
WEIXIN
">
WEIXIN
0757-86797137
">
TEL
久久99久国产精品66| 国产精品香港三级国产AV| 久久综合九色综合欧美98| 午夜性刺激免费看视频| 中国国语毛片免费观看视频| 国产成人精品一区二区视频| 欧美成人看片一区二区三区尤物| 国产精品白丝久久av网站 | 亚洲一区二区三区波多野结衣| 久久精品国产一区二区无码| 国产av无码专区亚洲av软件| 强奷乱码中文字幕熟女导航| 乱人伦视频中文字幕| 波多野结衣av高清一区二区三区 | 国产精品久久久av| 成人一区| 亚洲精品一区二区口爆| 久久无码专区国产精品s| 少妇的丰满3中文字幕| 国产成人亚洲精品无码AV大片 | 亚洲成A∧人片在线观看无码| 亚洲高清无在码在线电影| 曰曰摸夜夜添夜夜添高潮出水 | 日韩第三页| 免费看av| 成都市| 久久综合色鬼综合色| 海阳市| 无码人妻一区二区三区免费看成人 | 免费A级毛片| 丰满少妇被猛烈高清播放| 国产精品内射久久久久欢欢 | 精品久久久久免费视| 午夜熟女插插XX免费视频| 国产女同| 亚洲精华液一区二区三区| 国产精品色呦呦| 第一页中文字幕永久有效| 日韩人妻少妇一区二区三区| 精品久久久久久无码中文字幕一区| 亚洲欧美日韩在线一区|