Material requirements for floor-standing external scaffolding 1. 1 ① welded steel pipes with an outer diameter of 48mm and a wall thickness of 3.5mm are selected, and it is forbidden to mix steel pipes with an outer diameter of 5 1 mm .. The maximum length of vertical rod, main rail and diagonal rod is 6m, and the length of small rail is 1.2m② According to the Classification and Technical Conditions of Cast Iron, Castings shall be free of cracks and air holes, pouring risers shall be free of shrinkage cavities, sand holes and residual cracks, and burrs and scale shall be removed. It is forbidden to punch holes in steel pipes. (3), fastener and steel pipe joint surface must be strictly plastic, should ensure that the fastener and steel pipe contact is good, when the fastener clamping steel pipe, the minimum distance of the opening should be not less than 5mm, when the bolt tightening torque reaches 65N? M, fasteners shall not be damaged. (4) The moving parts of the fastener should be able to rotate flexibly, and the clearance between the two rotating surfaces of the rotating fastener should be less than 65438±0mm..(5 5) The surface of the fastener should be rustproof. ⑥ Scaffolding is made of bamboo or bamboo, and its length is 250× 2400 mm..7. Scrapping standard of steel pipes and fasteners: steel pipes are bent, squashed, cracked or severely corroded; Old fasteners should be checked for quality before use. Cracks and deformation are strictly prohibited. Bolts with smooth threads must be replaced. Today, outside the frame steel pipe adopts yellow antirust paint, railings adopt red and white antirust paint, fasteners brush crimson antirust paint. Pet-name ruby, even the wall parts: use the steel pipe consistent with the vertical rod and cross bar as the even wall parts. 1.2 the structure requires that the ground where the bottom of the landing scaffold is not on the basement roof be hardened with C 10 concrete, and the site shall be flat and free of water. Poles should use a single pole, and the bottom of the pole should be provided with a pad and a base according to the specification requirements. The internal bent frame is 0.3m away from the wall, the row spacing of vertical rods is 0.8m, the column spacing is 1.8m, the step height is 1.8m, and the horizontal spacing of small bars is 65448. There are four main poles in each step, and a big pole and a small pole (sweeping pole) are set at the bottom step 200. The connecting rod between the scaffold and the main wall is set in two steps and three spans: the vertical spacing is about 3.6m, and the horizontal spacing is about 4.5m, which is connected by fasteners; A vertical bracing is set every 5-7 roots on the outside of the vertical pole, and a large bracing is set in the middle of the height, with a bracing angle of 45-60 degrees. Outside the construction layer, a protective railing with a height of 0.9m and a skirting board with a height of 18cm are set. Due to the large cantilever size of some floors' decorative structures, the maximum cantilever size is 1.3m, which leads to the external scaffolding being far away from the wall. Every 10m, the length of the small bar in the operation layer and the closed layer shall be increased and closed with scaffolding.