. When not at the same height on the pole base, it must be the height of the vertical sweep shot to the lower pole and extend across two fixed height difference should not be greater than lm. Distance from the axis of the slope by the pole to the top of the slope of not less than 500mm. A steel door, the advantages 1) gantry steel scaffolding geometry standardization. Gantry steel scaffolding 2) reasonable structure Fuzhou scaffolding rental company by good mechanical properties, take advantage of the strength of steel, high load capacity. 3) the construction of easy assembly and disassembly, erection of scaffolding high efficiency, while saving time and labor, safe, reliable and economic use. 2. Disadvantages 1) frame size without any change in any flexibility Fuzhou Minhou scaffold rental, frame size should be replaced with another type of door frame and its accessories are generally less than 400mm is appropriate (in the new specification may have to be revised ), generally the top and bottom step by step Fuzhou maximum force when scaffolding pole lease terms, the calculation should be the main point. When dissatisfied group carrying capacity requirements should reduce vertical and horizontal spacing to increase the pole, reduce or increase the horizontal bar pitches. (2) the prevalence of domestic scaffolding substandard steel, fasteners, and other materials backwater and the end of care quality, the actual construction of the theoretical calculation does not take into account these, it is best to take certain safety factor in the design calculations. Fuzhou Fuzhou Mingguang scaffolding scaffolding _ (certified) _ scaffolding provided by the Fuzhou Mingguang steel frame construction projects Leasing Limited. Fuzhou Mingguang steel frame construction projects Leasing Co., Ltd. (www.fzmgjsj.com) is Fuzhou, a leader in site construction materials, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. In Fuzhou Mingguang scaffolding leadership with the staff warmly welcome all inquiries negotiations to create scaffolding Fuzhou Mingguang a better future.