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Types of scaffolding and their characteristics

by:Shizhan     2020-09-19
1. Advantages

1) Larger bearing capacity. When the geometrical size and structure of the scaffold meet the relevant requirements of the code, under normal circumstances, the bearing capacity of the single-tube column of the scaffold can reach 15kN~35kN (1.5tf~3.5tf, design value).
2) Convenient assembly and disassembly, flexible installation. Because the length of the steel pipe is easy to adjust and the fasteners are easy to connect, it can be adapted to scaffolding for buildings and structures of various planes and elevations.
3) It is more economical, simple to process, and lower investment cost; if you carefully design the scaffolding geometry and pay attention to increasing the utilization rate of steel pipe turnover, the material consumption can also achieve better economic effects. The steel pipe frame of fasteners is equivalent to about 15 kilograms of steel per square meter of construction.

2. Disadvantages

1) The fastener (especially its screw) is easy to lose;

The bolt tightening torque should not be less than 40N・m and should not be greater than 65N・m; [1]

2) The bars at the nodes are eccentrically connected, which transfers load and internal force by anti-sliding force, thus reducing its bearing capacity;

3) The connection quality of the fastener node is significantly affected by the quality of the fastener itself and the operation of the workers.

3. Adaptability

1) Construct various forms of scaffolding, formwork and other supporting frames;

2) Assemble the tic-tac-toe frame;

3) Build ramps, sheds, stands and other temporary structures,

4) As an aid to other kinds of scaffolding, strengthening rods;

4. Installation requirements

During the erection of steel pipe fastener scaffolding, attention should be paid to the flat and firm foundation, the installation of base and pad, and reliable drainage measures to prevent the foundation from being soaked by accumulated water.

According to the setting of the connecting wall poles and the size of the load, the commonly used open double-row scaffolding poles generally have a horizontal distance of 1.05~1.55m, masonry scaffolding steps are generally 1.20~1.35m, and decorative, masonry, and decorative scaffolds are generally used. It is 1.80m, and the vertical distance is 1.2~2.0m. The allowable erection height is 34~50m. When set up in a single row, the horizontal distance of the vertical pole is 1.2~1.4 m, and the vertical distance of the vertical pole is 1.5~2.0m. The allowable erection height is 24m.

The longitudinal horizontal rod should be set on the inner side of the vertical rod, and its length should not be less than 3 spans. The longitudinal horizontal rod can adopt butt joint fasteners or lap joints. If the butting fastener method is adopted, the butt fasteners should be arranged in a staggered manner; if the overlap connection is adopted, the overlap length should not be less than 1 m, and 3 rotating fasteners should be installed at equal intervals.

The main node of the scaffolding (ie, the fastening point where the three poles of the vertical pole, the vertical horizontal pole, and the horizontal horizontal pole abut) must be provided with a horizontal horizontal pole that is fastened with a right-angle fastener and it is strictly prohibited to remove it. The center distance between the two right-angle fasteners at the main node should not be greater than 150mm. In double-row scaffolding, the outer elongation of one end of the horizontal horizontal rod against the wall should not be greater than 0.4 times the horizontal distance of the vertical rod, and should not be greater than 500mm; the horizontal horizontal rod at the non-primary node on the working layer should be based on the supporting scaffold Need to be set at equal intervals, and the maximum distance should not be greater than 1/2 of the longitudinal distance.

The scaffolding board of the working layer should be fully and stably paved, 120~150mm away from the wall; long and narrow scaffolding boards, such as stamping steel scaffolding boards, wooden scaffolding boards, bamboo skewered scaffolding boards, etc., shall be set on three horizontal horizontal rods. When the length of the scaffold board is less than 2m, it can be supported by two horizontal horizontal rods, but the two ends of the scaffold board should be reliably fixed to it to prevent it from tipping over. The wide bamboo scaffolding board should be laid in the direction of the main bamboo ribs perpendicular to the longitudinal horizontal rods, and the butt joints shall be used for laying, and the four corners shall be fixed on the longitudinal horizontal rods with galvanized steel wires.

A base or backing plate should be set at the bottom of each pole. The scaffold must be equipped with vertical and horizontal sweeping poles. The vertical sweeping pole should be fixed on the pole not more than 200mm away from the upper skin of the base with right-angle fasteners. The horizontal sweeping pole should also be fixed on the vertical pole immediately below the vertical sweeping pole with right-angle fasteners. When the pole foundation is not at the same height, the vertical sweeping pole at the high place must be extended to the low place by two spans and fixed with the pole. The height difference should not be greater than lm. The distance from the axis of the pole above the slope to the slope shall not be less than 500mm.

Portal steel pipe

1. Advantages

1) The geometric dimensions of portal steel scaffolding are standardized.

2) The structure is reasonable, the bearing performance is good, the strength of steel is fully utilized, and the bearing capacity is high.

3) Easy assembly and disassembly during construction, high erection efficiency, labor-saving, time-saving, safe, reliable, and economical.

2. Disadvantages

1) There is no flexibility in the frame size. Any change in the frame size must be replaced with another model of door frame and its accessories

2) The cross brace is easy to break at the middle hinge point;

3) The shaped scaffold is heavier,

4) The price is more expensive

3. Adaptability

1) Construct stereotyped scaffolding

2) Support frame for beam and slab frame (to bear vertical load);

3) Construct a movable workbench;

4. Installation requirements

1. The foundation of portal scaffolding must be tamped, and drainage slopes should be made to prevent water accumulation

2. The erection sequence of portal scaffolding is: foundation preparation→placement of backing plate→placement of base→vertical two-fold single-piece door frame→installation of cross bar→installation of scaffolding plate→repeat the process of installing door frame, cross bar and scaffolding board on this basis .

3. The portal type steel pipe scaffold should be erected from one end to the other end, and the upper step scaffold should be completed after the lower step scaffold is erected. The erection direction is opposite to the next step.

4. For scaffolding at each step, insert two door frames into the base of the end point, and then install the cross bar to fix it, lock the lock piece, and then set up the future door frame, and install the cross bar immediately after each kick. And lock piece.

5. Scaffolding must be provided with reliable connections to the building.

6. Scissors support should be arranged on the outside of the door buckle steel pipe scaffold, and the vertical and longitudinal directions should be arranged continuously.

Bowl button

1. Advantages

1) Multi-function: According to the specific construction requirements, it can form single and double-row scaffolds with different frame sizes, shapes and load-bearing capacity, support frames, support columns, material lifting frames, climbing scaffolds, cantilever frames and other constructions equipment. It can also be used to build facility sheds, material sheds, lighthouses and other structures. It is especially suitable for erecting curved scaffolding and heavy-duty support.
2) High efficiency: The longest of the commonly used rods is 3130mm and the weight is 17.07kg. The assembly and disassembly speed of the whole frame is 3 to 5 times faster than the conventional one. The assembly and disassembly are fast and labor-saving. Workers can complete all operations with a hammer, avoiding many inconveniences caused by bolt operation.

3) Strong versatility: The main components are all steel pipes of ordinary fastener steel scaffolding, which can be connected with ordinary steel pipes with fasteners, which has strong versatility.

4) Large bearing capacity: The vertical rod connection is a coaxial socket, and the horizontal rod is connected with the vertical rod by a bowl buckle joint. The joint has reliable mechanical properties of bending, shear and torsion resistance. Moreover, the axis of each rod intersects at a point, and the node is in the frame plane, so the structure is stable and reliable, and the bearing capacity is large. (The load-bearing capacity of the whole frame is improved, which is about 15% higher than that of the fastener-type steel pipe scaffold in the same clean condition.)

5) Safe and reliable: When the joint is designed, the spiral friction force and self-gravity of the upper bowl buckle are taken into consideration, so that the joint has a reliable self-locking ability. The load acting on the crossbar is transmitted to the vertical rod through the lower bowl buckle, which has a strong shear resistance (maximum 199kN). Even if the upper bowl buckle is not pressed tightly, the crossbar joint will not come out and cause an accident. At the same time, it is equipped with safety net brackets, cross bars, scaffold boards, toe boards, and ladders. Pick Liang. Pole accessories such as wall supports are safe and reliable to use. 6) Easy to process: The main component is made of Φ48×3.5, Q235B welded steel pipes. The manufacturing process is simple and the cost is moderate. The existing fastener-type scaffolding can be directly processed and transformed. No complicated processing equipment is required.

7) Not easy to lose: The scaffold has no loose and easy to lose fasteners, which reduces the loss of components to a minimum.

8) Less maintenance: The scaffolding parts eliminate the bolt connection. The components are resistant to knocks. General corrosion does not affect the assembly and disassembly operations, and does not require special maintenance and repair.

9) Easy to manage: the component series are standardized, and the surface of the component is painted orange. Beautiful and generous, the components are neatly stacked, which is convenient for on-site material management and meets the requirements of civilized construction.

10) Easy to transport: The longest component of the scaffold is 3130mtm and the heaviest component is 40.53kg, which is convenient for handling and transportation.

2. Disadvantages

1) The crossbars are shaped rods of several sizes, and the bowl buckle nodes on the vertical rods are set at a distance of 0.6m, which limits the frame size;

2) The U-shaped connecting pin is easy to lose;

3) The price is more expensive;

3. Adaptability

1) Construct various forms of scaffolding, formwork and other supporting frames;

2) Assemble the tic-tac-toe frame;

3) Build ramps, sheds, stands and other temporary structures;

4) Construct a strong combined support column;

5) Construct a support frame to withstand lateral forces;


1) Easy and fast: the construction is easy and fast, and has strong mobility, which can meet the requirements of a wide range of operations;

2) Flexible, safe and reliable: According to different actual needs, it can build a variety of specifications, multiple rows of mobile scaffolding, various complete safety accessories, and provide firm and safe support during operation;

3) Convenient storage and transportation: It occupies a small area for disassembly and storage, and can be pushed to facilitate transfer. The parts can pass through various narrow channels.

Aluminum alloy

1. All parts of aluminum scaffolding are made of special aluminum alloy, which is 75% lighter than traditional steel frame

2. High component connection strength: adopting the new cold work process of internal expansion and external pressure, the destructive pull-off force of the scaffold joint reaches 4100-4400Kg, which is far greater than the allowable pull-off force of 2100Kg.

3. Easy and quick installation; equipped with high-strength casters, which can be moved.

4. The overall structure adopts the 'building block type' combination design, without any installation tools.

Aluminum alloy scaffolding can solve the problem of high-altitude operation of enterprises. It can be overlapped according to the actual required height. There are three height specifications of 2.32M/1.856M/1.392M. There are two width specifications, wide and narrow. The narrow frame can be overlapped on narrow ground, which is convenient and flexible. He can meet the requirements of high-altitude operations in narrow spaces such as walls, corners, stairs, etc., and is a good helper for high-altitude operations of enterprises.
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