Before erecting double-row scaffolding, the foundation must be laid down and a 5cm thick wooden springboard laid lengthwise. When laying wooden springboards, they must be laid and padded well and must not be suspended in the air. When setting up perimeter scaffolding, start from one corner and extend in a circle to both sides. The vertical poles should be erected in sequence according to the pole positioning lines, and the vertical poles should be connected and fixed with the vertical and horizontal sweeping poles. Then, install the vertical and horizontal flat poles in step 1, fix them with the corrected verticality of the vertical poles, and continue to erect them upward according to this requirement. In addition, supports and wall ties must be installed and set up simultaneously. Before installing the wall fittings for the first time, a certain number of throw supports should be temporarily added to ensure the stability of the scaffolding. The wall fittings should be removed after installation. The erection height limit for single poles and double racks is 50m. When it is necessary to erect scaffolding with a height exceeding 50m, double poles should be used below 35m or segmented unloading measures should be adopted from 35m onwards, and the height of the upper single pole should be less than 30m. Except for the top steps where the poles are extended, lap joints can be used, the joints of other floors and steps must be connected using butt fasteners. In general, the joint positions of adjacent poles should be staggered at different intervals. The staggered distance between two spaced joints of the same pole should not be less than 500mm in the height direction; the distance from the center of each joint to the main node should not be greater than the step distance. 1/3. The overlap length is not less than 1m, and three rotating fasteners are used to connect. The distance from the edge of the end fastener cover to the rod end should not be less than 100mm. Each vertical pole (including double vertical poles) must be connected to a large horizontal pole and must not be set up at intervals or omitted. When erecting high-rise scaffolding in upper and lower pairs, a single vertical pole is connected to one of the double vertical poles. The single vertical pole uses no less than three rotating fasteners to overlap the two double vertical poles at the same time, and its pole end is supported on a small crossbar. . Add two fasteners under the connecting fasteners between the vertical pole and the large horizontal bar, and the three fasteners are connected immediately. The extending positions of the upper and lower crossbars should be staggered in different vertical poles, and the distance from similar vertical poles should not be greater than one-third of the vertical distance. Small horizontal poles should be arranged close to the vertical poles (for double vertical poles, they should be arranged between the double vertical poles). It should be placed on a large crossbar and fastened with right-angle fasteners. One or two small crossbars should be set between adjacent vertical poles as needed. The principle of setting up scissor braces is: in addition to scaffolding with a length of less than 35m at both ends, a scaffolding should be set up every 12 to 15m in the middle. The scissor brace should be connected to three or four vertical poles, and the angle between the inclined pole and the ground is 345°~60°; for a scaffold over 35m in length, at least three shelves should be installed along the two ends and corners of the scaffold every 7 to 9 vertical poles. . Scissor braces should be arranged continuously along the height of the scaffolding, and a group of long scissor braces should be set up between two adjacent rows of scissor braces, every 10 to 15 meters high. The diagonal bar of the scissor brace should be connected to the vertical pole or large horizontal bar of the scaffold with rotating fasteners at both ends, and 3 to 4 fastening points should be added in the middle. The connection length of the inclined rod shall not be less than 1m, and shall be connected by no less than 3 rotating fasteners. Wall-connecting parts are generally set up in two steps and three spans. The spacing is: the vertical and horizontal directions of scaffolds below 50m are no more than 6m, and the vertical and horizontal directions of scaffolds above 50m are no more than 4m and 6m. Generally, it should be installed in structural parts with good horizontal resistance such as frame beams or floor slabs. The free height of the scaffolding above the top wall connection point should not be greater than 6m. There are two types of connection methods: rigid connection and flexible connection. Flexible fasteners are made of thin steel bars, ropes, double-stranded or multi-stranded iron wires. They only bear tensile force and mainly prevent the scaffold from tipping over, but they do not help much with the stability of the scaffold (that is, stable bearing capacity). This method can generally only be used for exterior scaffolding of buildings with 10 floors or less, and a certain number of rigid ties must be installed accordingly to withstand horizontal pressure. Rigid tie rods use rigid tie rods or components to form a connection structure that can withstand both tension and pressure. The connection and fixation method of the double-row scaffolding attached to the wall can be determined according to the project conditions. It generally includes: A. The tie rod passes through the wall and is fixed on both sides of the wall; B. The tie rod passes through the door and window, clamped with horizontal bars, and used with the backs on both sides of the wall. Wedge fixation; c. Set up embedded iron parts in the wall structure, fixedly connected to the tie rods equipped with flower basket bolts, and use flower basket bolts to adjust the tie spacing and verticality of the scaffolding; D. Set up embedded iron parts in the wall, And reinforced with fixed-length tie rods.
Double-row scaffolding, guardrails and springboards The operating floor where the scaffolding is located must have two guardrails. The upper one must be no less than 1.1m. The operating floor must be paved with at least two springboards. There must be no jumping probes and must be tied firmly with iron wires. General rules for the vertical and horizontal distance between feet and hands: the distance between vertical poles is generally 1.5m~1.8m; the horizontal distance is 0.9m~1.2m; the step distance is 1.5m~1.8m; the distance between the sweeping pole and the ground should not be greater than 200mm, and the distance between the sweeping pole and the ground should not be greater than 200mm. The end distance is 100~150mm from the outer wall of the structure, and the distance between the inner pole and the outer wall of the structure is about 250mm. The setting angle of the scissor brace is 45°~60°; the horizontal projection width should be no less than 2 spans or 4m, and no more than 4 spans or 8m.