国产精品美女久久久久av超清_法国空姐电影在线_国产999久久久_女仆男又爽又黄免费女仆视频_www黄色网址_午夜的福利_国产内射爽爽大片_污污视频在线_搞中出视频_麻豆精产国品_一二三精品_手机电影在线观看_日韩一区二区三区视频在线_乱老熟女一区二区三区_亚洲欧美丝袜中文综合

To build a steel plant which needs six parts

    Now the city in the ongoing construction, in many places need to be applied to the steel structure, especially the steel structure of the building houses. If you need to build one of these plants somewhere, which six parts will you need?
        1, embedded parts: (to stabilize the plant structure)
        2, the beam: C and H are generally used steel, (the middle of the height of the beam according to the span of the set)
        3, PURLIN: generally use C section steel and Z section steel.
       4, the pillars: the general use of H-beam, or C-shaped steel (usually with angle to the two C-shaped steel connection)
       5, tile: two, the first is a single tile (that is, color steel tile); the second is the composite board. (Note: the two layers of color coated with polyurethane or rockwool sandwiched to play the role of Dongnuanxialiang, there are noise effects of fire)
       6, support, pull bar, usually round bar.
        This is the most important six parts of a steel plant, the most common. Other parts are auxiliary, such as screws. More knowledge to pay attention to our website!