1. Project Overview
1.1 This project is located at building area square meters, length meters, width meters, and height meters.
1.2 Foundation treatment, using compaction and leveling.
2. Erection plan
2.1 Material and specification selection: According to the requirements of JGJ59-99 standard, steel pipes are used for erection, the steel pipe size is φ48×3.5MM, and steel fasteners are used.
2.2 Erection size:
2.2.1 The total height of the erection is meters, and it is required to be erected as the construction progresses, and the height exceeds the construction layer by 1.5 meters.
2.2.2 Erection requirements, according to the actual situation on site, double-row scaffolding is used, and the inner side of the frame uprights is fully enclosed with a safety mesh. The first-layer flat net is set at a height of 3.2 meters, and the layer net is set up as the construction progresses, and the inter-layer net is set up every 6 meters.
2.2.3 Construction requirements:
2.2.3.1 The distance between the vertical poles is 1.5 meters. The vertical pole foundation is padded with a full-length board (20CM×5CM×4CM long pine board), and a steel base (1CM×15CM×8MM steel plate) is used. A steel pipe core is set in the middle of the base, and the height is greater than 15CM. The vertical and horizontal sweeping poles are set at a height of 20 above the ground. They are set continuously on the inside of the vertical poles, and the vertical poles are extended by butt joints, and the joints are staggered, staggered by more than 50CM in height, and adjacent joints should not be in the same span. The joint should not be greater than 50 from the intersection of the large crossbar and the vertical pole. The top vertical poles can be overlapped, and the length should not be less than 1M, with two fasteners. The vertical deviation of the vertical poles is required to be no greater than 1/200 of the height when the height is less than 30M.
2.2.3.2 Large crossbars: The spacing between large crossbars is controlled at 1.5M to facilitate the hanging of the vertical net. The large crossbars are placed inside the vertical poles. The extension length on each side should not be less than 10CM, but should not be greater than 20CM. The rod extension needs to be butt-jointed, and the distance between the joint and the main joint should not be greater than 50.
2.2.3.3 Small crossbars: Small crossbars are placed on the large crossbars, and the length of the large crossbars should not be less than 10CM. The spacing of small crossbars: small crossbars must be installed at the intersection of the vertical poles and the large crossbars, 75CM at the scaffolding board, and not less than 18CM extending into the wall.
2.2.3.4 Scissor braces: A set of scissor braces should be installed at the corners at both ends of the external scaffolding, and every 6-7 (9-15M) vertical poles in the middle. The scissors brace is set up continuously along the height of the scaffolding from the foundation, with a width of not less than 6 meters, a minimum of 4 spans, and a maximum of 6 spans. The angle with the ground is 45° for 6 spans, 50° for 5 spans, and 60° for 4 spans. The scissors brace rod extension needs to be overlapped, and the overlap length is not less than 1M. Three fasteners are used for even distribution, and the end is not less than 10 km away from the fastener.
2.2.3.5 Scaffolding board: The scaffolding board should be fully laid, and the probe board is strictly prohibited. It must not be uneven, and the footboard must be set. The height of the footboard is 18 cm. The full paving is less than 10CM from the wall.
2.3 Tie between the frame and the building: The scaffolding height is above 7M and every 4M in height, and it is firmly tied to the building every 6M horizontally, and fixed with 50CM steel pipes inside and outside. Add top support to make it bear tension and pressure at the same time to ensure that the connection between the frame and the building is firm, without shaking or collapse.
2.4 Drainage measures: There should be no water accumulation at the bottom of the frame, and a drainage ditch should be set up.
3. Scaffolding acceptance.
3.1 External scaffolding must be erected by certified personnel, and it should be inspected and accepted in sections as the floor increases. The height should be accepted once every 9M. Those that do not meet the requirements should be rectified quickly.
3.2 The section acceptance of external scaffolding should be inspected according to the items listed in the “External Scaffolding Inspection Score Sheet” in JGJ59-99 and the requirements of the construction plan. The acceptance record sheet should be filled in, and the erection personnel, safety officer, construction personnel, and project manager should sign before it can be delivered for use.
3.3 There must be quantified acceptance content.
4. Labor arrangement for external scaffolding erection.
4.1 Determine the number of erection personnel according to the scale of the project and the number of external scaffoldings, clarify the division of labor, and conduct a technical briefing.
4.2 A management organization composed of project managers, construction personnel, safety officers, and erection technicians must be established. The person in charge of erection is responsible to the project manager and has direct responsibility for command, deployment, and inspection.
4.3 The erection and dismantling of external scaffolding must be equipped with sufficient auxiliary personnel and necessary tools.
5. Safety technical measures for the erection of external scaffolding.
5.1 Drainage ditches should be dug on the outside of the foundation of the external scaffolding pole to prevent rainwater from soaking the foundation.
5.2 External scaffolding shall not be erected within a safe distance from the overhead line, and reliable lightning protection and grounding treatment shall be done.
5.3 External scaffolding must be repaired and reinforced in time to achieve firmness and stability to ensure construction safety.
5.4 It is strictly forbidden to mix steel and bamboo, steel and wood for external scaffolding, and it is forbidden to mix fasteners, ropes, iron wires, and bamboo strips.
5.5 Personnel who erect external scaffolding must be certified to work and use safety helmets, safety nets, and non-slip shoes correctly.
5.6 Strictly control the construction load, and the scaffolding board shall not be piled with materials, and the construction load shall not be greater than 2KN/M2.
5.7 Control the tightening torque of the fastener bolts, use a torque wrench, and control the torque within the range of 40-50N.M.
5.8 It is strictly forbidden to have probe boards on the scaffolding boards. When laying scaffolding boards and multi-layer operations, the internal and external transfer of construction loads should be balanced as much as possible.
5.9 Ensure the integrity of the scaffolding. It shall not be tied together with the derrick or tower crane, and the frame shall not be cut off.
6. Safety and technical measures for the removal of external scaffolding.
6.1 Before dismantling the scaffolding, a comprehensive inspection shall be carried out on the scaffolding to be removed. According to the inspection results, an operation plan shall be drawn up, and submitted for approval, and the work shall be allowed after the safety and technical explanation. The operation plan generally includes the steps and methods of dismantling the scaffolding, safety measures, the location of the stacking materials, and the labor organization arrangement.
6.2 When dismantling the scaffolding, the operation area shall be divided, a protective fence shall be set up around it, and warning signs shall be erected. A special person shall be assigned to command on the ground, and non-staff members shall be prohibited from entering.
6.3 Workers working at high places who are dismantling the scaffolding shall wear safety helmets, fasten safety belts, wrap their legs, and wear soft-soled non-slip shoes.
6.4 The dismantling procedure follows the principle of top-down, first erection and then dismantling, that is, first dismantle the tie rod, scaffolding board, scissor brace, diagonal brace, and then dismantle the small crossbar, large crossbar, vertical pole, etc., and proceed in sequence according to the principle of one step and one clear. It is strictly forbidden to dismantle the frame at the same time.
6.5 When dismantling the vertical pole, hold the vertical pole first and then dismantle the last two buckles. When dismantling the large crossbar, diagonal brace, and scissor brace, the middle buckle should be removed first, then hold the middle, and then untie the end buckle.
6.6 The wall connecting rod (tie point) should be dismantled layer by layer as the dismantling progresses. When dismantling the throwing brace, should be supported by temporary support before dismantling.
6.7 When dismantling, the same command should be followed, and the upper and lower parts should respond to each other and coordinate the movements. When untying the knot related to another person, the other party should be notified first to prevent falling.
6.8 When dismantling the frame, it is strictly forbidden to touch the power line near the scaffolding to prevent electric shock accidents.
6.9 When dismantling the rack, personnel shall not be replaced midway. If personnel must be replaced, they shall explain the dismantling situation clearly before leaving.
6.10 The dismantled materials shall be transported down in time, and throwing is strictly prohibited. The materials transported to the ground shall be transported and classified according to the designated location as they are dismantled. They shall be cleared on the same day as they are dismantled. The dismantled fasteners shall be collected and processed in a centralized manner.
Post time: Aug-22-2024