门式脚手架的安装标准是什么样的？标准尺寸有哪…门式脚手架在国外的使用已经很普遍了，但在国内使用和发展时间还比较短，应用范围也比较狭窄。因而国内对门式脚手架标准和质量没有形成统一标准化，国外却在这一点上做得很好。门式脚手架是修建用脚手架中，使用…

12日上海镀锌脚手架市场价格下跌。今日上游方坯市场价格小幅下跌，带钢市场价格下跌幅度较大，带动管厂也下调出厂价格。目前上海镀锌脚手架市场价格受其影响，严重下跌，整体成交一般。近期期货市场一路下行，整体经济形势无利好消息。据了解，当地镀锌脚手架市场推涨乏力，下游客户采购意向一般，脚手架厂家保持观望情绪，对后市走势并不看好，不 确定因素尚存。库存方面持续低位水平运行，按需补货，操作谨慎。整体来看，预计短期内上海镀锌脚手架市场价格将偏弱运行为主。

Shanghai galvanized square pipe market prices fell on December 12. Today, the upstream billet market prices fell slightly, and the strip steel market prices fell by a larger margin, which led to the pipe factory to lower the ex-factory price. At present, the market price of galvanized square tubes in Shanghai is affected by it, which has fallen sharply and the overall turnover is general. Recently, the futures market has been declining all the way, and the overall economic situation is not good news. It is understood that the local galvanized square tube market is weak, downstream customers have general purchasing intentions, square tube manufacturers maintain a wait-and-see mood, the future trend is not optimistic, uncertainties still exist. Inventory continues to operate at a low level, replenishing on demand and operating cautiously. Overall, the market price of galvanized square tubes in Shanghai is expected to be weak in the near future. 原料方面，今日唐山普碳150方坯下跌30，报价3470元；唐山瑞丰355mm系列带钢价格下跌70，报价3710元。河北地区主流镀锌脚手架厂出厂价格下跌50-110不等。

In terms of raw materials, Tangshan Pucarbon 150 billet fell 30 yuan today, offering 3470 yuan; Tangshan Ruifeng 355mm series strip steel prices fell 70 yuan, offering 3710 yuan. The ex-factory price of the mainstream galvanized square pipe factory in Hebei fell by 50-110.

脚手架价格方面，现友发产4寸(3.75mm)焊管价格4230元；镀锌脚手架：友发产4寸 (3.5mm)镀锌脚手架价格4780，利达产4寸(3.5mm)镀锌脚手架价格4880，正金元产4寸(3.75mm)镀锌脚手架价格4680元，以上较上个交易日 下跌100。

As for square pipe price, the price of 4-inch (3.75 mm) welded pipe produced by Youfa is 4230 yuan; the price of 4-inch (3.5 mm) galvanized square pipe produced by Youfa is 4780 yuan; the price of 4-inch (3.5 mm) galvanized square pipe produced by Lida is 4880 yuan; the price of 4-inch (3.75 mm) galvanized square pipe produced by Jung Jin Yuan is 4680 yuan, which is 100 yuan lower than the previous trading day.

　　分析脚手架表面缺陷的五种检测方法脚手架表面缺陷的检测方法，主要有以下五种：一电涡流检测.电涡流检测有多种形式，常用的有常规涡流检测、远场涡流检测、多频涡流检测和脉冲涡流检测等，利用电涡流传感器对金属进行感应，脚手架表面不同缺陷类型和形…