Comprehensive drawing of external scaffold erection standard for building engineering?

(1) The erection and construction management of fastener-type steel pipe external scaffolding in building construction embodies the distinct external scaffolding image and standardized construction ability of the enterprise. According to the relevant national and local safety technical specifications, this standard compiles the internal standard of scaffolding outside construction projects.

(2) This standard specifies the facade image, structural requirements, erection and demolition, inspection and acceptance, and management requirements of external scaffolding, and details the structural practices of some special parts, including balconies, bay windows, external elevator unloading platforms, elevator shafts and lighting shafts, and external angles of buildings.

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

Second, the basic parameter requirements

(1) Material requirements for steel pipes: the steel pipes shall be Q235 ordinary steel pipes specified in national standards GB/T 13793 or GB/T309 1, and the model is φ48.3×3.6mm (calculated by φ48×3.0mm in the scheme). Materials shall have product certificates, and shall be accepted before being put into use.

(2) When the fasteners enter the construction site, the product certificate shall be checked and the second interview shall be conducted by sampling. Its technical performance should comply with the provisions of the national standard "steel tube scaffold couplers". There is no crack in the visual inspection of fasteners, and no damage shall occur when the bolt tightening torque reaches 65 N m..

(3) Outside the frame, the steel pipe of the hand frame must be derusted. After derusting, brush one coat of antirust paint and two coats of topcoat.

(4) The model of wooden scaffold is 3000(6000)×200(250)×50, and both ends are bound with φ 1.6mm galvanized iron wire; Steel wire mesh scaffolding adopts hpb 235φ6 steel bars with a spacing of 40mm, and is fixed on the small bar with φ 1.6mm galvanized iron wire.

Third, the steel pipe color

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

(2) Red paint: the wall surface.

(3) Yellow and black paint: protective railings outside scaffolding, protective railings on ramps and protective railings on unloading platforms.

(4) Red and white paint: scissors, transverse braces, skirting boards, protective railings at the edge of stairs and protective railings at the edge of elevator unloading platform.

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

Fourth, the facade image.

(1) The external protection of scaffolding must be closed with qualified dense mesh safety net. The company logo ("company" banner) and propaganda slogan should be set on the outer frame. Ensure that the outer frame is harmonious and beautiful, reflecting the characteristics of the enterprise.

Scaffolding example diagram

V. Bar Settings

(1) Four vertical poles should be set at the corner of the frame body and connected with the main rail.

(2) The longitudinal and transverse reinforcement must be set on the main node.

(3) In addition to the top of the top floor, the vertical rods must be butted, the ledger can be overlapped outside the corner of the frame, and the bracing must be overlapped.

(4) The bracing and even the wall pieces must be erected and dismantled synchronously with the external scaffolding. It is strictly forbidden to build before demolition.

Six, vertical pole foundation

(1) The erection height of the floor-standing scaffold shall not exceed 35m, and unloading measures must be taken when the height is 35 ~ 50m, and unloading measures must be taken when the height exceeds 50m, and experts will demonstrate the special scheme.

(2) The scaffold foundation shall be leveled and compacted, and the concrete shall be hardened. The foundation is hardened with C25 concrete, with a thickness of 100mm, and the base or pad is set at the bottom of the column. The pad shall be made of wood with a length of not less than 2 spans, a thickness of not less than 50 mm and a width of not less than 200 mm. ..

(3) The floor-standing scaffold must be provided with vertical and horizontal sweeping poles, and the vertical sweeping poles should be fixed on the vertical poles near the bottom of the vertical sweeping poles with direct fasteners. When the vertical rod foundation is not at the same height, the vertical sweeping rod at the high place must extend to the lower place for two spans and be fixed with the vertical rod, the height difference should not be greater than 1m, and the slope of the road above the slope should not be less than 500mm.

(4) Drainage measures should be taken around the scaffold foundation. The elevation of the scaffold foundation bottom surface should be 50mm higher than the outdoor natural ground, and a drainage ditch with a cross section of not less than 200mm×200mm should be set outside the vertical pole foundation to ensure that the scaffold foundation does not accumulate water.

Schematic diagram of scaffold foundation drainage ditch

Scaffolding foundation contour

Schematic diagram of steel base

VII. Facade Protection

(1) The outer side of the scaffold is covered with a dense mesh safety net, the mesh number is not less than 2,000 mesh/100cm 2, and the mesh is connected vertically, each mesh is fixed with 16# iron wire and steel pipe, and the mesh is horizontally overlapped, and the overlapping length is not less than 200mm. The corner of the frame body should be lined with wooden Fang to ensure the beautiful lines of the safety net at the corner of the frame body.

(2) Starting from the second step, skirting boards of 180mm are set at the bottom of the outer scaffold, and protective railings of the same material are set at the height of 600mm and 1200mm respectively. If a limb is formed inside the scaffold, it should be protected according to the outside of the scaffold.

(3) The outer pole and main rail of the scaffold shall be painted with yellow paint, and the surface of the middle pole shall be painted with yellow and black paint. Warning belts with a height of 200mm shall be set on the facade every 3 floors or 9m and 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 paint.

Front view of pedals and protective railings

Schematic diagram of warning belt

Example diagram of elevation protection

Eight. Horizontal protection

(1) The operation floor must be covered with scaffolding, and the distance between scaffolding and building structure should not be greater than150 mm..

(2) Hard partition protection shall be laid on the second floor of the landing frame, the first floor of the cantilever frame (climbing frame) and the middle floor of no more than 10m and no more than three floors, and a horizontal pocket net shall be hung between the two layers of hard protection, and the horizontal pocket net must be hung on the building structure.

(3) The clear distance between internal column and scaffold is generally not more than 200mm. If it is greater than 200 mm, the upright must be flat and firm. When the clearance between the scaffold board of the operation floor and the building is greater than 150mm, it should be fully enclosed to prevent people and materials from falling.

Schematic diagram of horizontal pocket net

Nine, even the wall parts

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

(2) Scaffolding must adopt rigid wall parts.

(3) Even the wall parts should be provided with longitudinal horizontal bars from the first step at the bottom. When there are difficulties, reliable measures should be taken to solve them. Even the wall part should be arranged in a diamond, square or rectangle.

(4) Even the wall parts should be set close to the master node, and the distance from the master node should not be greater than 300 mm.

(5) The spacing of wall connectors shall be determined according to the design calculation, and shall conform to the following table "Maximum spacing of wall connectors".

(6) Both ends of linear and open scaffolding must be provided with wall pieces, and the vertical spacing of wall pieces should not be greater than the height of the building, and should not be greater than 4m (two steps).

Ten, bracing and lateral brace

(1) The bracing shall be set continuously from the bottom corner to the top of the scaffold, and the surface of the bracing shall be painted with red and white warning paint.

(2) The number of each bracing across the vertical pole shall be determined according to the following table. The width of each bracing should not be less than 4 spans and should not be less than 6 meters. The inclination angle between the diagonal and the ground should be 45 ~ 60, and the inclination angle should be 45 ~ 60.

(3) For floor-standing legs below 24m, vertical continuous bracing shall be set at both ends of the outer side of the frame, at corners and at elevations, and the spacing shall not exceed15m. Floor-standing outriggers and all cantilever frames over 24 meters should be provided with continuous support on the whole facade outside the frame.

(4) The extension of the bracing should be overlapped, the overlapping length should not be less than 1m, and not less than three fasteners should be firm.

(5) Braces should be fixed at the protruding end of the horizontal bar intersecting with it or fixed on the vertical bar with rotating fasteners, and the web from the center line of the rotating fasteners to the main node should not be greater than150 mm. ..

(6) Cross braces must be set at the two fractures of linear and open double bent frames. For frames over 24m, a cross brace should be set at the corner of the frame and in the middle of the frame every 6 spans.

(7) Transverse supports shall be arranged zigzag from bottom to top in the same section, and the supports shall be crossed and connected with the top with internal and external big bars.

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