I. Introduction

(1) the erection and construction management of the external scaffolding of the fastener type steel pipe in the construction of the enterprise, reflecting the enterprise has a characteristic external scaffolding image and standardized construction capabilities, this standard in accordance with the relevant national and local safety technical specifications, the preparation of the "construction engineering external scaffolding erection standards".

(2) This standard makes a specific statement on the façade image, structural requirements, erection and demolition, inspection and acceptance, and management requirements of external scaffolding, and refines the structure of some special parts, which mainly include: balcony, bay window, external elevator unloading platform, elevator shaft and lighting shaft, building corner, etc.

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

Second, the basic parameter requirements

(1) Steel pipe material requirements: steel pipe should be made of Q235 ordinary steel pipe specified in the national standard GB/T13793 or GB/T3091, and the model should be Φ48.3×3.6mm (the scheme is calculated according to Φ48×3.0mm), and the material should provide a product certificate and acceptance, and it can be put into use only after passing the test.

(2) The fastener should be inspected for the product certificate when entering the construction site, and the sampling retest should be carried out, and the technical performance should meet the provisions of the national standard "Steel Pipe Scaffolding Fastener", and the fastener appearance inspection should not be cracked, and no damage shall occur when the bolt tightening torque reaches 65N·m.

(3) The steel pipe of the outer frame scaffold must be treated with anti-rust, and one anti-rust paint and two topcoats must be brushed after the rust is removed.

(4) Wooden scaffold model 3000 (6000) × 200 (250) ×50, both ends are tied with Φ1.6mm galvanized iron wire;

3 Steel pipe color

(1) Yellow paint: scaffolding poles, large and small crossbars, longitudinal and horizontal sweeping rods.

(2) Red paint: wall pieces.

(3) Yellow and black two-color paint: scaffolding outer protective railing, ramp protective railing, unloading platform protective railing.

(4) red and white two-color paint: scissor brace, transverse diagonal brace, skirting board, staircase edge protection railing, construction elevator unloading platform edge protection railing.

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

■Example diagram of protective railing

4 Facade image

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

■Scaffolding example diagram

5 Member Settings

(1) 4 vertical rods should be provided at the yin and yang corners of the frame body, and the large crossbar should be connected and closed.

(2) The main node must be provided with longitudinal and transverse horizontal rods.

(3) the vertical rod must adopt butt except the top of the top layer, and the large crossbar can be lapped outside the corner of the frame body, and the scissor brace must be lapped.

(4) Scissor braces and wall pieces must be erected and dismantled synchronously with the external scaffolding. It is strictly forbidden to build or dismantle first.

6 pole foundation

(1) The height of the floor scaffold should not exceed 35m, and unloading measures must be taken when the height is 35~50m, and unloading measures must be taken when the height is greater than 50m

Conduct expert arguments.

(2) The scaffold foundation is flat, compacted, and the concrete is hardened, and the foundation should be hardened with 100mm thick C25 concrete, and the base or backing plate is provided at the bottom of the pole. The backing plate should be used in length

Wooden backing with less than 2 spans, thickness of not less than 50mm, and width of not less than 200mm.

(3) the floor-type scaffold must be provided with longitudinal and transverse sweeping rods, and the longitudinal sweeping rods should be fixed on the vertical poles that are close to the longitudinal sweeping rods immediately below the direct fasteners. When the pole foundation is not at the same height, the longitudinal sweeping rod at the height must be extended to the low place by two spans and fixed with the pole, the height difference should not be greater than 1m, and the distance between the pole axis road slope above the tight slope is not less than 500mm.

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

■ Scaffolding foundation drainage ditch diagram

■ Scaffolding foundation section

■ Schematic diagram of steel base

7 Facade protection

(1) The outside of the scaffold is full of dense mesh safety nets, the number of meshes is not less than 2000 mesh / 100cm 2, the mesh body is vertically connected by the mesh connection method, each mesh should be fixed with 16# iron wire and steel pipe, and the lap joint method is adopted when the mesh body is horizontally connected, and the lap length shall not be less than 200mm. The corner part of the frame body should be lined with a wooden fang to ensure that the safety net lines at the corner of the frame body are beautiful.

(2) The outside of the scaffold is provided with a 180mm foot guard plate at the bottom from the second step, and a protective railing of the same material is set at 600mm and 1200mm in height. If the inner side of the scaffold forms a border, the outer side of the scaffold shall be protected.

(3) scaffolding outer row pole, large crossbar surface brush yellow paint, waist bar surface brush yellow and black two-color paint, façade every 3 layers or 9m set up a 200mm high warning belt, 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 of foot guards and protective railings

■Schematic diagram of the warning tape

8 Horizontal protection

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

(2) the second layer of the landing frame, the first layer of the cantilever frame (climbing frame), the middle layer does not exceed 10m and does not exceed three layers of full paving a hard partition protection, and in the middle part of the two layers of hard protection hang a horizontal net, and the horizontal net must be hung to the building structure.

(3) The net distance between the inner pole of the scaffold is generally not more than 200mm, such as more than 200mm, it must be laid flat and firm, and the gap between the scaffold board and the building on the working floor should be fully enclosed when it is greater than 150mm to prevent personnel and materials from falling.

9 wall pieces

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

(2) Scaffolding must be made of rigid wall pieces.

(3) connecting wall pieces should be set up from the first longitudinal horizontal rod of the bottom layer, and when there is difficulty there, reliable measures should be adopted to fix. The diamond-shaped arrangement should be preferred, and the square and rectangular arrangement can also be used.

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

(5) The spacing of the connecting wall pieces shall be calculated according to the design calculation, and shall comply with the provisions of the following table "Maximum spacing of the arrangement of connecting wall pieces".

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

10. Scissor brace and transverse diagonal brace

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

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

(3) the floor-type outer frame below 24 meters, on the façade of the outer side of the frame body, the corner and the middle interval not more than 15 meters, are provided with vertical continuous scissor support. The floor-mounted outer frame of more than 24 meters and all cantilever frames are erected with continuous scissor supports on the entire façade on the outside of the frame.

(4) The length of the scissor brace should be lapped, the lap length should not be less than 1m, and not less than 3 fasteners are firm.

(5) scissor brace oblique rod should be fixed on the extended end or upright rod of the transverse horizontal rod that intersects with it with a rotating fastener, and the kick from the center line of the rotating fastener to the main node should not be greater than 150mm.

(6) slotted, open type double-row frame two fractures must be provided with transverse diagonal brace, and the frame body above 24m is provided with a transverse diagonal brace at the corner of the frame body and every six spans in the middle.

(7) The transverse diagonal brace should be arranged in a zigzag shape from the bottom to the top in the same internode, and the diagonal brace cross and the inner and outer large crossbars are connected to the top.

11 ramps

(1) When the height of the ramp for sidewalk and high-quality material transportation is not more than 6m, it is advisable to use a zigzag, and when the height is greater than 6m, it is appropriate to use a zigzag.

(2) The width of the material ramp should not be greater than 1.5m, the slope should be 1:6, the width of the pedestrian ramp should not be less than 1m, and the slope should be 1:3.

(3) the bend should be provided with the platform, its width should not be less than the width of the ramp, both sides of the ramp and the periphery of the platform should be provided with 1.2m and 0.6m high double protective railing and 180mm foot guard, the surface of the protective railing is brushed with yellow and black warning color, and the surface of the foot guard is brushed with red and white warning color.

(4) the ramp should be attached to the outer scaffolding or the building setting, and its façade should be provided with scissor support, and the ramp is hung with a dense safety net on the outside of the closure.

(5) the foundation of the ramp is consistent with the outer scaffold foundation, and the connecting wall piece of the ramp is arranged according to the requirements of the open type scaffolding.

(6) the ramp should be full of scaffolding, the material scaffold is not less than 40mm thick plank, the pedestrian ramp can be made of wooden planks or bamboo pieces full of paving, the ramp should also be provided with anti-skid strips, the thickness of the anti-skid strips is 20~30mm, the spacing is not more than 0.3m, the scaffold board and anti-skid on the ramp should ensure stability and firmness.

12 Security Protection

12.1 Stair edge protection

(1) When there is no reliable protection at the edge of the staircase and the rest platform, the guardrail should be set up. Three protective railings should be set at a height of 1.2m and 0.6m and at the bottom, and a dense safety net should be hung on the inner side of the rod

(2) Protective facilities should be stereotyped and instrumentalized.

(3) The pole is fixed with embedded parts or M12 expansion bolts

12.2 Tower crane operating platform and pedestrian passage protection

12.2 Tower crane operating platform and pedestrian passage protection

(1) tower crane must be erected with an operating platform attached to the wall at the attached wall part, and the area of the platform should be able to meet the requirements of use, and the steel pipe is used to erect or stereotyped the operating platform.

(2) The operating platform attached to the wall must be provided with a 1.2m high protective railing and hang a safety net, and the inner side of the railing is provided with a foot guard, and the bottom is full of scaffolding.

(3) when the tower crane is set up on the passage, the channel should be covered with scaffolding and fixed firmly, the protective railings on both sides are not less than 1.2m, the inner side of the railing is hung with a safety net, and the bottom is installed with a 180mm high baseboard, and can only be erected in the attached position.

(4) The passage of the tower crane shall not be connected with the external scaffolding

12.3 Construction elevator platform protection

(1) The construction elevator floor unloading platform must be prepared before the erection, and the erection height exceeds 24m, measures should be taken to unload. It is forbidden to set the pole continuously from the bottom to the top.

(2) The floor unloading platform should be erected separately, and it is strictly forbidden to connect with the outer frame. The height of each layer should not be less than 2m, 2 protective railings should be set on both sides of the platform, 1.2m high, and 200mm high foot guards should be set at the bottom. The floor unloading platform plate must be thick and firm, and the laying should be tight, and 5cm thick wooden boards or non-skid steel plates should be used.

(3) the construction elevator platform exit is installed with a metal protective door that opens inward at 1 .8m high vertical open normally closed, and the tool-type protective door should be used.

(4) the middle of the two protective doors of the floor unloading platform should be sealed by the template, and the blue paint is painted outside and the floor identification is provided.

12.4 Safe passage shelter

(1) The entrance and exit of the building must be equipped with a safe passage protective shed, which is anti-smashing, rainproof,

Impact-resistant function.

(2) in the scope of hoisting influence and the building within the fall radius of the channel, material processing area, material hoist inlet, external elevator ground inlet and other areas that need to prevent falling objects from high altitudes, must be set up to prevent penetration of the double-layer protective shed, double-layer protective shed (spacing 600mm), must be fully paved with the material that can withstand the uniform static load of >10KPa (50mm thick plank or in accordance with the regulationsother materials).

(3) Safety slogans and warning signs should be set up on the front façade of the safety passage shed.

(4) A safety education culture wall or safety education publicity cartoon should be set up in the safety passage, with a height of 1-2

m, using outdoor spray painting.

(5) The height of the safety passage shed pole above the roof should not be less than 700mm, and it should be in the ultra-high part of the roof

Dense mesh safety net is hung on both sides, and the safety net is arranged on the inside of the pole.

(6) Both sides of the safety passage are closed by dense safety nets.

(7) The width × height of the vehicle safety passage should be greater than 4000mm × 4000mm.

(8) The width × height of the pedestrian safety passage should be greater than 3500mm × 4000mm.

13 cantilever frames

13.1 General Provisions

(1) before the cantilever scaffold is erected, a special construction plan must be prepared, and the plan must include the cantilever beam plane positioning layout drawing. The height of the sectional erection should not exceed 20m

More than 20m should be organized experts to conduct program demonstration.

(2) the cantilever beam of cantilever scaffold must be selected not less than the I-beam of No. 16, and the anchor end length of the cantilever beam should not be less than 1.25 times of the length of the cantilever end, and the cantilever length

It should not be excessively long.

(3) cantilever beam anchor ring end should be provided with two anchor rings (20cm apart), anchor ring diameter 16mm or more. The end of each steel beam is provided with a cable-stayed wire rope of more than φ14mm, and the upper end is hoisted

The ring is embedded with φ20mm round steel.

(4) I-beams, anchor screws, cable-stayed wire ropes The specific specifications and models should be finalized according to the plan and calculation in addition to meeting the above requirements.

(5) the bottom of the scaffold should be provided with a sweeping rod along the longitudinal and horizontal direction according to the requirements of the specification, and the upper surface of the cantilever beam should be welded with a short steel bar to fix the vertical rod, and the wooden fang is laid along the length of the scaffold above the crossbar, and the template is fully paved for prevention

Protect.

(6) all the outer frame poles of the cantilever frame must sit on the section steel beam, and the cantilever beam at the sunny angle should be arranged according to the sector (radial), when the vertical rod near the corner can not be directly installed on the cantilever type steel beam, the auxiliary steel connecting beam (flat stretch beam) should be laid longitudinally along the outer frame on the cantilever beam, and the outer frame vertical rod is installed in

On the auxiliary steel beam, there shall be no hanging foot rod (the lower part is suspended).

(7) The façade is equipped with continuous scissor braces along the entire surface.

(8) The cantilever frame connecting the wall pieces should be set up in two steps (each layer) and two spans.

13.2 Fixing of section steel beams

(1) the fixation of section steel beam: the fixation of section steel beam and main body concrete structure can be fixed with embedded bolts, reinforcement pull ring anchorage, and shall not be connected with fasteners.

(2) when using the reinforcement pull ring anchorage, the pull ring should be anchored into the floor slab 30d, and pressed under the lower layer of the floor reinforcement, if the thickness of the concrete protective layer of the reinforcement can not be guaranteed, the pull ring can also be pressed on the lower layer of the floor reinforcement, at the same time on the upper part of the pull ring on both sides respectively attach two steel bars with a diameter of 14-16mm, and with the floor steel bar binding firmly,to ensure that the pull ring will not be pulled out of the concrete floor slab

(Rebar is forbidden to be used for steel bar pull rings).

(3) The anchor ring is embedded before concrete pouring, the screw thread buckle is protected with tape, and the anchor ring is equipped with 2Φ12,1m long steel bar when the plate thickness is less than 120mm.

13.3 Protection of the Cantilever

(1) The outside of the pick frame must be closed by a qualified dense safety net, and the safety net is hung tightly with not less than 18# lead wire, and the safety net should be hung on the inside of the picker pole, and the safety net shall not be enclosed on the outside of each rod.

(2) When the distance between the frame and the building is greater than 20cm, the station piece should be laid. In addition to the 1.2m high guardrail and 180mm high basebar on the outside of the frame, the inside of the frame should also be protected when it encounters the edge (such as large open windows, door openings, etc.).

(3) The bottom of the cantilevered outer scaffold (cantilever beam) adopts hard protection (template) and is tightly closed

The bottom surface of the hard protective (template) should be coated with yellow and black paint.

(4) the scaffolding operation layer and the bottom layer should adopt a qualified safety net or take other measures to carry out sectional sealing protection.