1. Project Overview
1.1 This project is located in: building area in square meters, length in meters, width in meters, and height in meters.
1.2 Basic treatment, using tamping and leveling
2. Setup plan
2.1 Material and specification selection: According to the JGJ59-99 standard requirements, steel pipes are used for erection. The steel pipe size is φ48×3.5MM and steel fasteners are used.
2.2 Installation dimensions
2.2.1 The total erection height is meters. 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 conditions on site, double rows of scaffolding are used, and the inside of the vertical poles of the frame is constructed with a fully enclosed enclosure of safety dense mesh. A flat net will be set up on the first floor at a height of 3.2 meters, and nets will be set up along the layers as the construction progresses, and inter-layer nets will be set up every 6 meters.
2.2.3 Structural requirements
2.2.3.1 The spacing between poles is 1.5 meters, the pole base is padded with a long 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, with a height greater than 15CM. Set the vertical and horizontal sweeping pole at a height of 20CM from the ground. They are continuously installed on the inside of the pole. The length of the pole is connected by butt joints. The joints are staggered and staggered by more than 50cm in height. Adjacent joints should not be in the same span. The distance between the joint and the junction between the large horizontal pole and the vertical pole should not be greater than 50CM. The top poles can be overlapped, the length should not be less than 1M, and there are two fasteners. The vertical deviation of the pole is required to be no greater than 1/200 of the height when the height is less than 30M.
2.2.3.2 Large horizontal poles: The distance between large horizontal poles is controlled at 1.5M to facilitate the installation of vertical nets. The large horizontal poles are placed inside the vertical poles. The extension length of each side should not be less than 10CM, but should not be greater than 20CM. The extended lengths of the poles need to be butt-jointed, and the distance between the contact point and the main contact point should not be greater than 50CM.
2.2.3.3 Small crossbar: The small crossbar is placed on the large crossbar, and the length of the large crossbar is not less than 10CM. The spacing between the small crossbars: a small crossbar must be set up at the intersection of the vertical pole and the large crossbar, and 75CM at the scaffolding board. , and extend into the wall no less than 18CM.
2.2.3.4 Scissor braces: A set of scissor braces should be provided at the corners of both ends of the outer scaffolding and every 6-7 (9-15M) vertical poles in the middle. The scissor braces are set continuously from the foundation along the height of the scaffolding, with a width of not less than 6 meters, with a minimum span of 4 spans and a maximum span of 6 spans. The angle with the ground is: 45° for 6 spans, 50° for 5 spans, 4 spans 60°. The length of the scissor brace must be overlapped, and the overlap length should not be less than 1M. Three fasteners should be used to distribute them evenly, and the distance between the ends of the fasteners should not be less than 10CM.
2.2.3.5 Scaffolding boards: Scaffolding boards should be fully paved. Probe boards are strictly prohibited and must not be uneven. Foot-blocking boards must be set up and the height of the foot-blocking boards should be 18CM. The distance between the full floor and the wall is less than 10CM.
2.3 The frame is tied to the building: the height of the scaffolding is above 7M and each height is 4M. It is firmly tied to the building every 6M horizontally, and is fixed with 50CM steel pipes inside and outside. A top support is added to enable it to withstand both tension and pressure, ensuring a firm connection between the frame and the building and preventing it from shaking or collapsing.
2.4 Drainage measures: There should be no accumulation of water at the bottom of the rack, and drainage ditches should be set up.
3. Scaffolding acceptance
3.1 External scaffolding must be erected by certified personnel. As the floors increase, they will be inspected and accepted step by step. The inspection will be carried out once at a height of 9M. Those that do not meet the requirements should be rectified quickly.
3.2 The segmented acceptance of external scaffolding should be inspected according to the items listed in the “Exterior Scaffolding Inspection Rating Table” in JGJ59-99 and the content required by the construction plan. The acceptance record sheet should be filled in and the erection personnel, safety officers, constructors, and project managers should have visas. , before it can be delivered for use.
3.3 There must be quantitative acceptance content.
4. Labor arrangements for erection of external scaffolding
4.1 Determine the number of erection personnel based on the scale of the project and the number of external scaffolding, clarify the division of labor and conduct technical briefings.
4.2 A management organization composed of project managers, constructors, safety officers, and erection technicians must be established. The erection manager is responsible to the project manager and has direct responsibility for command, deployment, and inspection.
4.3 Sufficient auxiliary personnel and necessary tools must be provided for the erection and removal of external scaffolding.
5. Safety technical measures for external scaffolding erection
5.1 Drainage ditches should be dug outside the outer scaffolding pole foundation to prevent rainwater from soaking the foundation.
5.2 External scaffolding shall not be erected within a safe distance from overhead lines, and reliable lightning protection and grounding shall be provided.
5.3 External scaffolding must be repaired and reinforced in time to achieve firmness and stability and ensure construction safety.
5.4 It is strictly prohibited to mix steel, bamboo, steel and wood on external scaffolding, and it is prohibited to mix fasteners, ropes, iron wires and bamboo poles.
5.5 External scaffolding erection personnel must hold a certificate to work, and correctly use safety helmets, safety nets, and wear non-slip shoes.
5.6 Strictly control the construction load. Materials shall not be concentrated on the scaffolding board and the construction load shall not exceed 2KN/M2.
5.7 To control the tightening torque of 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 scaffolding boards. When laying scaffolding boards and multi-layer operations, the internal and external transmission of construction loads should be balanced as much as possible.
5.9 Ensure the integrity of the scaffolding. It must not be tied together with the derrick and tower crane, and the frame body must not be cut off.
6. Safety technical measures for removal of external scaffolding
6.1 Before dismantling the scaffolding, conduct a comprehensive inspection of the scaffolding to be dismantled. Based on the inspection results, draw up an operation plan, apply for approval, and conduct safety technical briefing before proceeding. The operation plan generally includes: steps and methods of dismantling the frame, safety measures, stacking locations, labor organization arrangements, etc.
6.2 When dismantling the structure, the work area should be divided, protective fences should be set up around it, and warning signs should be erected. There should be dedicated personnel on the ground to direct the work, and non-staff members should be prohibited from entering.
6.3 Personnel working at heights dismantling racks should wear safety helmets, seat belts, leg wraps, and soft-soled non-slip shoes.
6.4 The dismantling procedure follows the principle of starting from top to bottom, first erecting and then dismantling, that is, first dismantle the tie rods, scaffolding boards, scissor braces, diagonal braces, and then dismantle the small crossbars, large crossbars, vertical bars, etc., and clear them step by step. The principle is to proceed in sequence, and it is strictly forbidden to dismantle the racks up and down at the same time.
6.5 When dismantling the vertical pole, you should first hold the vertical pole and then remove the last two buckles. When removing the large horizontal bar, diagonal brace, and scissor brace, you should first remove the middle fastener, then hold the middle, and then unfasten the end buckles.
6.6 The connecting wall rods (tie points) should be dismantled layer by layer as the demolition progress progresses. When dismantling the supports, they should be supported by temporary supports before they can be dismantled.
6.7 When dismantling, the same command should be followed, the movements should be coordinated, and when untying a knot related to another person, the other person should be notified first to prevent falling.
6.8 It is strictly forbidden to touch the power cord near the scaffold when dismantling it to prevent electric shock accidents.
6.9 When dismantling the rack, no one is allowed to change people midway. If it is necessary to change people, the dismantling situation should be explained clearly before leaving.
6.10 The dismantled materials must be transported in a timely manner, and throwing is strictly prohibited. The materials transported to the ground should be dismantled and transported at the designated location and stacked in categories. They should be dismantled on the same day and cleaned up on the same day. The dismantled fasteners must be recycled and processed centrally.
7. Draw installation drawings
Post time: Nov-29-2023