
The entire process of installing buckle type scaffolding
1、 Construction preparation: scheme disclosure and component inspection
1. Technical disclosure and scheme review
Before construction, a special technical briefing should be organized to clarify the layout of the frame (spacing between uprights, step spacing between horizontal bars, position of connecting wall components), the height of the erection, and the treatment of special parts (such as overhanging sections and corners).
Audit the quality of components:
Pole: Check whether the welded disc is firm and whether the steel pipe is bent (allowable deviation ≤ L/1000).
Horizontal/diagonal bar: The plug and pin need to be matched, and the pin should be self-locking after tapping, without looseness or deformation.
Tool preparation: Hammer (for tightening the pin), spirit level (for controlling the verticality of the pole), steel tape measure (for measuring spacing), wrench (for adjusting the base/support).
2. Basic processing and layout positioning
Foundation requirements:
The soil foundation needs to be compacted layer by layer (compaction coefficient ≥ 0.94), and a 100mm thick C20 concrete hardening layer should be laid, or a full-length channel steel (16 # or above) should be padded.
The foundation of the outer frame of high-rise buildings needs to have a drainage slope (≥ 3%) to avoid settlement of the poles caused by water accumulation.
Layout positioning:
According to the design drawings, mark the position of the uprights with ink lines, with a vertical and horizontal spacing deviation of ≤ 50mm. The joints of adjacent uprights should be staggered by more than 500mm (using a combination of high and low uprights, such as alternating 1.5m and 2.0m uprights).
2、 First floor installation: closure from the base to the sweeping rod
1. Install the pole and base
Erect each upright pole, tighten the adjustable base (adjustment range ≤ 50mm) to make the pole height consistent, use a level to level each row, and ensure that the verticality deviation of the pole is ≤ L/200 (L is the pole height).
Fixed base: The base is fixed on a concrete foundation using expansion bolts, while for soil foundations, it is necessary to ensure that the base is tightly attached to the cushion plate.
2. Connect the sweeping rod to the horizontal bar
Sweeping rod setting: The first horizontal bar serves as the sweeping rod, with a height of ≤ 300mm from the ground. It must be fully enclosed in both longitudinal and transverse directions, and any omissions are strictly prohibited.
Horizontal bar installation:
Align the horizontal bar plug with the main hole of the vertical pole disc, ensuring that the insertion depth is ≥ 35mm. Use a hammer to evenly tap the pin until the tail buckle is in contact with the disc (the exposed length of the pin is ≥ 10mm, and there is no shaking).
Check the levelness of the horizontal bars: the height difference between the two ends of the horizontal bars in the same row is ≤ 20mm, and the height difference between the horizontal bars within the same span is ≤ 10mm.
3. Install diagonal bars and temporary ties synchronously
After the installation of the first horizontal bar is completed, immediately install vertical diagonal bars (set every 5 spans) or diagonal braces (angle 45 ° -60 °) according to the design requirements, forming a stable triangular structure.
If the height of the frame exceeds 4m, temporary braces (with an angle of 60 ° with the ground) need to be set up until the installation of the connecting wall components is completed.
3、 Standard layer construction: gradually rising layer by layer and structural connection
1. Pole elevation and horizontal bar installation
The extension of the vertical pole adopts an internal insertion tube connection (insertion depth ≥ 150mm) to ensure that the upper and lower vertical poles are concentric, and the verticality deviation after extension is ≤ 3mm.
Install horizontal bars layer by layer according to the design step spacing (outer frame ≤ 1.8m, support frame ≤ 1.5m), and each horizontal bar must be connected to all vertical bars. Jumping or missing installation is strictly prohibited.
2. Simultaneous construction of diagonal braces and connecting wall components
Diagonal pole arrangement:
Vertical diagonal bars should cover the entire facade of the frame, with one bar set every two steps and three spans, or the entire surface should be covered with diagonal bars (recommended for high-rise frames).
Set one horizontal diagonal bar every 2-3 steps to enhance the anti torsion ability of the frame.
Installation of wall connecting components:
According to the principle of "two steps and three spans", wall connecting components (spacing ≤ 6m × 4m) are set up, and steel pipes are reliably connected to structural columns and shear walls (such as hoop type and embedded type).
Wall connecting components must be erected synchronously with the frame, and delayed installation is strictly prohibited.
3. Laying of scaffold boards and protective facilities
The scaffold board should be fully and stably laid, fixed with buckles and crossbars, and the probe length should be ≤ 150mm.
Set up protective railings on the outer side (with a height of 1.2m for the upper railing and a center for the middle railing) and dense mesh safety nets (with a mesh density of ≥ 2000 mesh/100cm ²), and set up 180mm high toe boards at the bottom.
4、 Special part treatment: Suspended and high formwork scenarios
1. Installation of cantilever frame body
The anchorage length of the cantilever steel beam (16 # I-beam) is ≥ 1.25 times the cantilever length, and the end is equipped with anchor bolts with a diameter of ≥ 20mm (fixed with double nuts).
The bottom of the vertical pole is welded and fixed with the steel beam (welding length ≥ 100mm), or connected through the U-shaped buckle. The first floor needs to add diagonal brace (with an included angle of 45 ° with the cantilever beam).
2. Installation of high formwork support frame
When the height of the frame is greater than 8m or the span is greater than 18m, horizontal diagonal bars should be fully distributed on the top and bottom layers, and one bar should be set every 4-6m on the middle layer to form a "horizontal truss layer".
The extension length of the adjustable support screw is ≤ 300mm, and the insertion length into the pole is ≥ 150mm, ensuring that the bearing capacity meets the design requirements (single support load ≤ 30kN).
3. Arc or corner structure
At non right angle corners, universal diagonal bars or short horizontal bars (0.6m) are used to adjust the angle, ensuring a smooth transition of the frame; The arc-shaped structure can be formed by reducing the spacing between the uprights (such as 0.9m × 0.9m) and splicing multiple short horizontal bars together to form an arc.
5、 Acceptance and delivery: Ensure the safety and compliance of the frame
1. Quality acceptance standards
Node inspection: Randomly select 30% of nodes, there is no rebound sound when the pins are struck, and the connections are firm without looseness.
Verticality and levelness:
The overall verticality deviation is ≤ H/600 (H is the frame height), and ≤ 50mm.
The horizontal deviation of the crossbar is ≤ L/400 (L is the length of the crossbar).
Load test: The high support formwork body needs to undergo a preloading test (with a loading value of 1.1 times the construction load), and can only be used if the monitored settlement is ≤ 3mm and there is no continuous deformation.
2. Acceptance documents and delivery
Organize acceptance materials: including component qualification certificates, installation records, self inspection reports, supervision acceptance opinions, etc.
Hanging notice: After passing the acceptance inspection, hang a "qualified acceptance sign" in a prominent position on the frame, indicating the person in charge of the installation, the acceptance date, the allowed load, and other information. Overloading is strictly prohibited.
Summary: Five step mnemonic and safety points
The installation of buckle type scaffolding can be summarized into five steps: "preparation in place, first layer stability, standard layer tying, strengthening of special parts, and strict inspection". During construction, special attention should be paid to:
Node connection: The plug must be tightened to avoid "false connections".
Structural tie: The connecting wall components and diagonal bars must be set synchronously according to the plan, and lagging is strictly prohibited.
Process monitoring: High risk scenarios (such as high formwork and cantilever frames) require real-time monitoring of frame deformation, and any abnormalities should be immediately stopped for rectification.