Customization of steel formwork specifications: What are the installation steps for steel formwork? 双语对照 笔记

1、 Construction preparation
Venue handling
Remove debris such as gravel and loose soil, compact the foundation surface with a flatness error of ≤ 3mm/m ², and ensure a bearing capacity of ≥ 150kPa
Total station calibration axis, error control: plane position ± 2mm, elevation ± 1mm
Material acceptance
Check the verticality deviation of the steel formwork to be ≤ 1.5mm/m, and the joint defect to be ≤ 0.5mm
The strength grade of the supporting bolts should be ≥ 8.8, and the pre tightening torque of the nuts should be ≥ 200N · m
2、 Positioning and Support
Bottom positioning
The basic template adopts Φ 20 positioning support rods with a spacing of ≤ 600mm and a depth of ≥ 50mm embedded in concrete
Welding limit steel plate at the bottom of the column template, with a thickness of ≥ 6mm, and a plane size 10mm larger than the template section
Supporting system
Double row scaffolding with pole spacing ≤ 1.2m, horizontal bar spacing ≤ 1.5m, diagonal brace angle of 45-60 °
Scaffold board supported by beam formwork, with a continuous laying area of ≥ 70% of the projected area
3、 Formwork hoisting
Hanging point setting
Square template hanging points are set at the four corners, and circular templates are symmetrically set with 4-6 hanging points
The safety factor of the suspension rope is ≥ 6 times, and rubber corner protectors are added to the contact surface to prevent scratches
Accurate positioning
Hover and fine tune 300mm above the ground, with a falling speed of ≤ 0.5m/s and a positioning deviation of ≤ 3mm
3mm thick closed cell foam adhesive strip is added between adjacent formwork joints to prevent leakage
4、 Connect and fix
Bolt tightening
The spacing between U-shaped cards is ≤ 300mm, and L-shaped connection corner molds are used at the corners
The diameter of the docking bolt is ≥ M16, and the pre tightening force compliance rate detected by the torque wrench is 100%
Reinforcement measures
A column hoop is installed every 600mm on the column template, and a Φ 14 pair of tension screws @ 450mm are installed on the beam side template
Slant support is added for cantilever structure with support angle of 45 °± 5 °, and anchor ring is embedded at the root for fixation
5、 Calibration review
Geometric dimensions
Laser leveling instrument detects template verticality ≤ 2mm/m, flatness ≤ 3mm/2m
Reserved hole position deviation ≤ 5mm, diameter error ± 1.5mm
System stability
Apply a simulated load of 10kN/m ², with deformation monitoring ≤ L/400
Key inspection after rain and snow: support system settlement ≤ 3mm
6、 Acceptance criteria
Testing items allow for deviation detection tools
Axis position ± 3mm total station
Section size+2/-3mm ultrasonic thickness gauge
Adjacent board height difference ≤ 1mm 2m ruler
Seam gap ≤ 1.5mm plug gauge
Key points of safety control
Set up a protective railing with a diameter of 48 × 3.5mm and a height of ≥ 1.2m for edge operations
Set up a warning zone within the radius of the lifting operation, and stop the operation when the wind speed is greater than 10.8m/s (level 6)
Maintain a safe distance around the template of live equipment: 1kV or below ≥ 1.5m, 10kV ≥ 3m
By implementing the standardized process mentioned above, the qualified rate of steel formwork installation can be achieved at ≥ 98%, and the qualified rate of concrete forming dimensions can be achieved at ≥ 95%