Since the development of foreign wall scaffolding, fastener-type steel pipe scaffolding has been the most widely used, but there are shortcomings in assembly and disassembly, reliability, safety, and economy. The exterior wall socket-type disc buckle steel pipe scaffolding that has been used in practice by our company has the characteristics of easy assembly and disassembly, flexible construction, good appearance, energy saving, and environmental protection. At the same time, a novel construction method for exterior wall scaffolding was formed. Compared with the traditional fastener-type outer frame, it has obvious effects on assembly and disassembly speed, reliability, safety, labor saving, energy saving, and environmental protection, so it has obvious social and economic benefits.
This construction method is suitable for the construction of floor-standing and cantilevered exterior frames.
1. Features of the construction method: Specially designed insert plate and locking structure. The joint is designed taking into account the effect of self-gravity so that the joint has reliable two-way self-locking ability. The load acting on the crossbar is transferred to the vertical pole through the buckle. The socket-type buckle has strong shear resistance and is different from the traditional Fasteners are more reliable than fasteners. Multi-directional connections make the frame construction flexible and manual construction more efficient. The socket-type disc-buckle outer frame has good integrity. There are no loose parts and the locking structure ensures the stability of the scaffold. If there is only one worker and a hammer, it can be built. Extremely high erection and dismantling efficiency. The entire frame adopts a modular design, with a simple structure, easy and fast assembly, and disassembly, and there is little loss of bolt work and scattered fasteners. During the assembly and disassembly process, workers can complete all operations with a hammer. The service life of the socket-type disc-buckle outer frame is much longer than that of the traditional fastener-type outer frame, and can generally be used for more than 10 years. The components are bump-resistant, have excellent visual quality, and do not need to be painted, which is energy-saving and environmentally friendly.
2. Scope of application: Suitable for external protection and decoration of construction engineering structures.
3. Process principle: It is composed of vertical poles, horizontal poles, diagonal tie rods, adjustable bottom brackets, and other components. The vertical poles are connected by sleeves and sockets, and the horizontal poles and diagonal tie rods are connected by rod ends and joints into the vertical pole connection inserts, connected by wedge-shaped pins, and wall-connecting points are set according to regulations to form a geometrically unchanged structural system. A buckle-type profiled steel plate is laid on the top, and a safety net is hung on the outside to seal it for external protection and decoration of the structure.
4. Construction process and operating points
4.1 Construction process: Construction preparation – pre-embedded prefabricated bolts → concrete pouring → laying I-beams → fixing I-beams → laying channel steel – → scaffolding erection – → hanging safety nets.
4.2 Operation points:
① Embedded prefabricated bolts: The prefabricated bolts are welded to a 5mm thick steel plate using two φ20 filament bolts. Before binding the overhanging layer of steel bars, first place the center line of the section of steel on the template according to the designed step distance, and then place the prefabricated bolts The parts are fixed on the formwork with iron nails. The center line should be between the two bolts. Then put a plastic sleeve on the bolt that is a little longer than the thickness of the floorboard (to facilitate the recycling of the embedded parts), and use plastic tape. Cover the bolts with exposed casing parts (to prevent mud from splashing on the bolts when pouring concrete).
②Laying section steel: After the concrete is poured, start laying the I-beam, correct the entry and exit position, and then fix it with double nuts. After the I-beam is fixed, channel steel is laid on it continuously along the longitudinal direction of the frame. The U-port of the channel steel is set upward and welded to the I-beam on one side. If the I-beam passes through the wall, a wooden box needs to be placed at the place where the I-beam passes through the wall to facilitate the removal of the I-beam after the scaffolding is dismantled.
4.3 Scaffolding erection
①After the cantilever layer channel steel is fixed, the socket-type disc buckle outer frame vertical pole can be placed in the channel steel U-shaped groove using the adjustable bottom bracket, and then the first row of shelves is set up according to the normal construction process. The crossbars between the vertical poles on the channel steel surface should be set up immediately before they can continue to be erected upwards. They should be erected in stages according to the floors. The height of each erection must be one step higher than the floor construction working surface (used as guardrails).
② During each scaffolding erection process, buckle-type pedals must be laid, vertical diagonal rods and connecting wall rods must be set up, and the overhanging layer and the gap between the overhanging layer and the building must be laid with wooden boards to create hard isolation.
③ The scaffolding on the operating floor is covered with buckle-type pedals. The gap between the scaffolding and the building is horizontally protected with scaffolding boards or small pocket nets, leaving a gap of 12~15cm.
④ Diaphragm parts should be pre-embedded in shear walls or floor slabs and arranged in two steps and three spans. If steel pipes cannot be buried in the gable position, screw holes should be used for reinforcement. All diaphragm parts must be painted red.
⑤ The socket-type disc-buckle outer frame should be provided with diagonal tie rods for every five vertical spans along the longitudinal direction of the frame body.
⑥ The socket-type disc-buckle outer frame uses ordinary steel pipes to connect to the disc-buckle vertical poles at each step laterally at the disconnection point. Each ordinary steel pipe uses at least three cross fasteners, and scissor braces are continuously provided vertically along the frame body.
4.4 Hanging safety net: Socket-type disc buckle-type outer frame, a dense safety net is set up on the inside of the outer pole, closed for protection, and fastened to the crossbar. A flat net is installed every six floors for protection, and the vertical net is used with iron wire and the crossbar. 2. The vertical poles must be tied firmly, and the nets must be tied firmly outside the net joints. The gap should not be larger than 20cm. The safety net should be placed inside the outer poles, and the height should not be less than 1.2m above the construction surface.
4.5 The disassembly sequence is: safety net → toe board → body railing → hook pedal → vertical diagonal tie rod → horizontal rod → vertical rod → connecting wall rod, longitudinal support, and scissor brace.
① The dismantling of the socket-type disc-buckle outer frame must be approved by the project department, and the professional person in charge must provide safety technical explanations to the operating workers. Debris on the scaffolding should be removed before dismantling.
② When dismantling the socket-type disc-buckle outer frame, divide the working area, set up fences or set up warning signs around it, set up dedicated personnel on the ground to direct, and non-staff members are strictly prohibited from entering.
③When dismantling the socket-type disc-buckle outer frame, workers working at heights must wear safety helmets, seat belts, and soft-soled shoes.
④ When dismantling the socket-type disc-buckle outer frame, the principle should be followed from top to bottom, first put up and then disassembled, and then put up first and disassembled. First remove the baffle hook pedal, scissor brace, diagonal brace, and crossbar, and clean them step by step. The principle is to proceed in sequence, and it is strictly prohibited to carry out demolition operations up and down at the same time.
⑤ The connecting wall parts should be dismantled layer by layer as the scaffolding is dismantled. It is strictly prohibited to dismantle the entire layer or several layers of the connecting wall parts before dismantling the scaffolding. The height difference of the segmented dismantling should not be greater than 2 steps. If the height difference is greater than 2 steps, additional installations should be added. Reinforcement of connecting wall parts.
⑥ When dismantling the socket-type disc-buckle outer frame, unified command, upper and lower response, and coordinated movements are required. When untying the knot related to another person, the other person should be notified first to prevent falling. It is strictly prohibited to keep unstable rods on the frame.
⑦ Before dismantling a large piece of scaffolding, the reserved loading platform should be reinforced first to ensure its integrity, safety, and stability after dismantling.
⑧The dismantled materials should be tied down with ropes and thrown down. It is strictly prohibited to throw them. The materials transported to the ground should be dismantled and transported at the designated place, and stacked in categories. They should be cleaned up on the day of dismantling. During the dismantling process, no one should be changed in the middle. If there is a need to change, Personnel must clearly explain the demolition situation before leaving with the consent of the squad leader.
Post time: May-20-2024