A comprehensive illustration of the standards for erecting external scaffolding in construction projects?

1. Foreword

(1) The erection and construction management of fastener-type steel pipe exterior scaffolding in construction reflect the company’s characteristic exterior scaffolding image and standardized construction capabilities. This standard is in accordance with the national In accordance with relevant local safety technical specifications, the "Internal Standards for the Erection of External Scaffolding in Construction Projects" was compiled.

(2) This standard makes specific statements on the facade image, structural requirements, erection and dismantling, inspection and acceptance, and management requirements of external scaffolding, and details the construction methods of some special parts. The detailed parts mainly include: balconies, bay windows, external elevator unloading platforms, elevator shafts and lighting wells, and sun corners of buildings, etc.

(3) If the specific content of this standard is inconsistent with the requirements of relevant national and local safety technical regulations, the relevant national and local safety technical regulations shall prevail.

2. Basic parameter requirements

(1) Steel pipe material requirements: The steel pipe should be Q235 ordinary steel pipe specified in the national standard GB/T13793 or GB/T3091, and the model should be Φ48. 3×3.6mm (the plan is calculated based on Φ48×3.0mm). When the material comes to the site, the product certificate must be provided and accepted. It can be put into use only after it is qualified.

(2) When fasteners enter the construction site, the product certificate should be checked and sampling retests should be carried out. The technical performance should comply with the national standard "Steel Pipe Scaffolding Fasteners". The appearance of the fasteners should be inspected without cracks. When the bolt tightening torque reaches 65N·m, damage shall not occur.

(3) The steel pipes of the outer scaffolding must be rust-proofed. After rust removal, apply one coat of anti-rust paint and two coats of topcoat.

(4) The wooden scaffolding board model is 3000 (6000) × 200 (250) × 50, and the two ends are bound with Φ1.6mm galvanized iron wire; the reinforced mesh scaffolding is made of HPB235Φ6 steel bars with a section spacing of 40mm, and is used Φ1.6mm galvanized iron wire is fixed on the small crossbar.

3. Steel pipe color

(1) Yellow paint: scaffolding poles, large and small horizontal poles, vertical and horizontal sweeping poles.

(2) Red paint: attached to the wall.

(3) Yellow and black two-color paint: protective railings on the outside of the scaffolding, protective railings on the ramp, and protective railings on the unloading platform.

(4) Red and white two-color paint: scissor braces, transverse diagonal braces, skirting boards, stair edge protective railings, and construction elevator unloading platform edge protective railings.

(5) If the color of the schematic diagram is inconsistent with the text description, the color of the text description shall prevail.

IV. Facade image

(1) The outer protection of the scaffold must be closed with a qualified dense-mesh safety net. The company logo ("Company" banner) and promotional slogans should be installed on the outer shelf. Ensure that the outer frame is coordinated and beautiful, reflecting the characteristics of the enterprise.

Scaffolding example diagram

5. Rod settings

(1) Four vertical poles should be installed at the Yin and Yang corners of the frame body, and the large horizontal poles should be connected and closed.

(2) Vertical and horizontal horizontal rods must be set at the main node.

(3) The vertical poles must be butt-jointed except for the top of the top floor. The large horizontal poles can be overlapped outside the corners of the frame, and the scissor braces must be overlapped.

(4) Scissor braces and wall-connecting parts must be erected and dismantled simultaneously with the external scaffolding. It is strictly prohibited to put it up later or dismantle it first.

6. Pole Foundation

(1) The height of floor-standing scaffolding should not exceed 35m. Unloading measures must be taken when the height is between 35 and 50m. Unloading measures must be taken when the height is greater than 50m. Loading measures and expert evaluation of special plans.

(2) The foundation of the scaffolding should be flat, compacted, and the concrete should be hardened. The foundation should be hardened with 100mm thick C25 concrete, and a base or pad should be set at the bottom of the pole. The backing board should be made of wood with a length of not less than 2 spans, a thickness of not less than 50mm, and a width of not less than 200mm.

(3) Floor-standing scaffolding must be equipped with vertical and horizontal sweeping poles. The longitudinal sweeping pole should be fixed to the vertical pole immediately below the longitudinal sweeping pole with direct fasteners.

When the pole foundations are not at the same height, the vertical sweeping pole at the high place must be extended to the lower part by two spans and fixed to the pole. The height difference should not be greater than 1m, and the distance between the pole axis and the slope immediately above the slope should not be less than 500mm. .

(4) Drainage measures should be taken into account around the scaffolding foundation. The bottom elevation of the scaffolding base should be 50mm higher than the outdoor natural floor. A drainage ditch with a cross-section of not less than 200mm×200mm should be set outside the pole foundation to ensure that the scaffolding The foundation does not accumulate water.

Scaffolding foundation drainage ditch diagram

Scaffolding foundation section diagram

Steel base diagram

7. Facade protection

(1) The outside of the scaffolding is covered with a dense mesh safety net with a mesh number of not less than 2000 mesh/100cm 2. The mesh connection method is used when the mesh body is connected vertically. Each mesh should be fixed with 16# iron wire and steel pipe. The mesh body When connecting horizontally, adopt the overlapping method, and the overlapping length shall not be less than 200mm. The corners of the frame should be lined with wooden beams to ensure the beautiful lines of the safety net at the corners of the frame.

(2) On the outside of the scaffolding, a 180mm foot guard will be installed at the bottom starting from the second step, and a protective railing of the same material will be installed at a height of 600mm and 1200mm. If there is an edge on the inside of the scaffolding, the protection methods on the outside of the scaffolding should be followed.

(3) Paint the outer row of vertical poles and large crossbars with yellow paint, and paint the surface of the waist rails with yellow and black two-color paint. Set up a 200mm high warning tape every 3 floors or 9m on the facade. Fixed on the outside of the pole. The size of the warning tape is shown in the figure, and the surface is painted with red and white warning color paint.

Elevation view of footboards and protective railings

Schematic diagram of warning strips

Example diagram of facade protection

8. Horizontal protection

(1) The working floor must be covered with scaffolding boards, and the distance between the scaffolding boards and the building structure should not be greater than 150mm.

(2) On the second floor of the floor frame and the first floor of the cantilever frame (climbing frame), the middle layer shall not exceed 10m and shall not exceed three floors with a hard partition for protection, and two layers of hard protection A horizontal pocket net is hung in the middle part, and the horizontal pocket net must be hung to the building structure.

(3) The distance between the inner pole of the scaffolding and the body is generally not greater than 200mm. If it is greater than 200mm, a flat and solid stand piece must be laid, and the gap between the scaffolding board on the working floor and the building must be greater than 150mm. It should be fully enclosed to prevent people and materials from falling.

Schematic diagram of horizontal pocket net

9. Wall-connecting parts

(1) The surface of wall-connecting parts should be painted with red eye-catching paint to facilitate inspection and warning.

(2) Scaffolding must use rigid wall-connecting parts.

(3) The wall-connecting parts should be installed starting from the first longitudinal horizontal rod on the ground floor. When there are difficulties there, reliable measures should be used to fix them. Wall-connecting parts should be arranged in a diamond shape first, but square or rectangular arrangements can also be used.

(4) The connecting wall parts should be set close to the main node, and the distance from the main node should not be greater than 300mm

(5) The spacing between the connecting wall parts should be specified according to the design calculation, and It should comply with the requirements of "Maximum spacing between wall-connecting parts" in the table below.

(6) The two ends of the straight-shaped and open-shaped scaffolding must be equipped with wall-connecting parts. The vertical spacing between the wall-connecting parts should not be greater than the floor height of the building and should not be greater than 4m (two steps) .

10. Scissor braces and transverse diagonal braces

(1) The scissor braces should be set continuously from bottom to top from the bottom corner of the scaffold, and the surface of the scissor braces should be painted with red and white warning colors.

(2) The number of vertical poles that each scissor brace spans should be determined according to the provisions of the table. The width of each scissor brace should not be less than 4 spans, and should not be less than 6 meters. The inclination angle between the diagonal pole and the ground should be 45° to 60°.

(3) For floor-standing external frames with a height of less than 24 meters, vertical continuous scissor braces should be installed on the outer ends of the frame, at the corners, and on the facade with a spacing of no more than 15 meters in the middle. For floor-standing external frames and all cantilevered frames above 24 meters, continuous scissor braces are set up on the entire facade outside the frame.

(4) The extension length of the scissor brace should be overlapped. The overlap length should not be less than 1m, and no less than 3 fasteners should be strong.

(5) The scissor brace diagonal rod should be fixed with a rotating fastener on the extended end of the transverse horizontal rod or vertical pole that intersects with it. The distance from the center line of the rotating fastener to the main node should not be greater than 150mm.

(6) Horizontal diagonal braces must be installed at the two fractures of straight-shaped and open-type double-row racks. A transverse diagonal brace must be installed at the corners of the rack and every six spans in the middle of the rack above 24m.

(7) The transverse diagonal braces should be arranged in a zigzag shape from bottom to top in the same intersection, with the diagonal braces crossing and connecting the inner and outer large horizontal bars to the top.

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