First, the type of attached lifting scaffold
There are many classification methods for attaching lifting scaffolds. According to the form of attachment support, it can be divided into: cantilever type, hanging type, rail type, guide type, etc.; according to different lifting power, it can be divided into: electric, chain hoist, hydraulic, etc.; According to the control mode, it can be divided into: manual control, automatic control, etc.; according to the lifting mode, it can be divided into: single piece, segmented type, integral type, etc.; according to the climbing mode, it can be divided into: casing type, picking beam type, mutual climbing Type, rail type, etc. It is commonly used in engineering to classify according to different climbing methods.
1. Casing-mounted lifting scaffolding
The casing type attached lifting scaffold is composed of a scaffolding system and a lifting device. The scaffolding system is composed of a lifting frame and a longitudinal horizontal rod connecting the lifting frame, a scissor support, a scaffolding board and a safety net.
The lifting principle of the casing-type attachment lifting scaffold is realized by alternate lifting of the fixed frame and the sliding frame. When the fixed frame is fixed, the connection between the sliding frame and the building is fixed by the lifting point on the fixed frame to the building; then the connection between the fixed frame and the building is loosened, and the sliding frame is used. The lifting point lifts the fixing frame to a certain height and is fixed, thus completing a lifting process. When the scaffolding is required to descend, the reverse operation is sufficient.
2. Cantilevered attached lifting scaffold
The cantilever-attached lifting scaffold is a widely used attached lifting scaffold. It consists of three parts: scaffolding, climbing mechanism and lifting system. Scaffolding can be made up of fastener-type steel pipe scaffolding or bowl-type steel pipe scaffolding; the climbing mechanism is composed of bearing tray, lifting beam, guide wheel and anti-overturning and fall protection safety device; the lifting system generally uses the chain-type electric hoist For control, the rated lifting load of the electric hoist is not less than 70kN, and the lifting speed should not exceed 250mm/min.
The lifting principle of the cantilever-attached lifting scaffold: the electric hoist is hung on the picking beam, and the hook of the hoist is hung on the bearing tray, so that the electric hoist is forced to release the bearing to fix the fixed connection of the panel with the building. When the electric hoist is started, the climbing frame rises or falls along the building. After the climbing frame is raised (lowered), the bearing tray is fixed to the building and the shelf is connected to the building. Then the shelf completes a lifting (lowering) process.
3. Mutual climbing attachment scaffolding
The self-climbing attachment scaffold consists of a unit scaffold, a wall supporting mechanism and a lifting device. The unit scaffolding can be set up by steel pipe scaffolding and bowl-type scaffolding; the wall supporting is a device for fixing the unit scaffolding on the building, which can be fixed by the wall bolt and the embedded part, or the diagonal strut can be arranged at the bottom of the shelf. Support the scaffolding of each unit; the lifting device generally uses the chain hoist, its rated lifting load shall not be less than 20kN, the hook of the chain hoist is hung on the beam of the frame adjacent to the lifting unit, and the hook is hung at the bottom of the hoisted unit. . The lifting principle of the self-climbing attached lifting scaffold is: each unit scaffold is lifted separately. When lifting a unit scaffold, the hook of the chain hoist is hung on the two bodies adjacent to the lifting unit to lift the hoist. The hook is hooked to the bottom of the lifted unit to release the restraint of the lifted unit, and the operator stands on two adjacent frames for lifting operation; when the lift unit is raised to the design position, it is fixed with the building. The hoist is then hung on the beam of the unit for lifting operation of the adjacent scaffolding unit.
4. Rail-mounted lifting scaffolding consists of three parts: scaffolding, climbing mechanism and lifting system. Its climbing mechanism is different from the above, and it is a unique mechanism, including guide rails, guide wheels, lifting pulleys, lifting pedestals, wall struts, wall brackets, wall slabs, limit locks, The limit lock block and the diagonally-drawn wire rope are composed of shaped members. The lifting system is also a chain hoist or a chain-type electric hoist.
The lifting principle of the rail-mounted scaffolding is as follows: the rails are arranged vertically along the building, and the length is higher than the scaffolding. The upper and lower parts of the rack are equipped with guide rails, the lifting brackets are fixed on the rails, and the lifting hoists are hung on one side. On the other side, the steel wire rope is fixed, and the steel wire rope bypasses the lifting pulley block and the hook connection of the lifting hoist; when the lifting hoist is started, the shelf can be raised along the guide rail and lifted to a predetermined position for fixing; the guide rail and the wall hanging plate which are vacated at the bottom are removed, Load it to the top and move the lifting pedestal to the top to prepare for the next lift.