a. Conduct joint review of the construction drawings and work out engineering construction plans.
b. Select related equipment according to the engineering characteristics and actual conditions, and ensure that the equipment is in good working condition with complete functions.
c. Prepare all quality certificates and retest reports for the materials used in this project.
d. Check the size of the approach components, verify the bottom corner bolts, and pop up the axis and elevation line.
Hoisting sequence and input of equipment and personnel
a. Hoisting sequence: re-measurement of axis and elevation, roof steel beam, steel support, roof purlin, tie rod support, color steel plate.
b. Equipment list
|3||Electric Screw Driver||BOCH-400||5|
|4||Electric Welding Machine||DX-300||1|
|5||Gad Cutting Machine||1|
c. Personnel: Depends on the dimension of steel structure and local weather.
According to the process requirements, the QY70 crane is determined to be used for hoisting (see the crane load calculation book), and one-time hoisting is adopted. The steel beam should be lifted 30-40 cm from the ground before the formal lifting. Check whether the lifting point is arranged properly, whether the stability of the steel beam meets the requirements, and whether the traction strength is tied up and then make the connection.
After the first beam is in place, the axis expansion and verticality correction will be carried out immediately to ensure stability. Support rods are installed between the beams. After the installation is completed, the elevation of all beam bottoms should be unified with the same axis and line. The error should be controlled within the specified range.
Lifting and correction of steel beam
The inspection should be made firstly once the steel beam components are transported to the site. The two-point lift up method is adopted to turn over the beams, and short steel pipes and square timbers are used by workers to temporarily assist the lift up. After the steel beam is turned over, it is necessary to carry out multiple test lifting and re-bind the slings in time. During the test lifting, the crane must rise slowly to ensure that the lifting points are uniformly stressed and the steel beams are not deformed. That is, lifting and rotating to the design position, and then the worker pulls the control rope pre-packed on the beam on the ground. While fixing, the verticality is checked with a hanging hammer to make it meet the requirements.
When hoisting the steel beam, the concrete needs to be reviewed. At this time, the hoist wire rope cable is generally used for inspection, and the cable can be loosened after the beam is installed. The ridgeline of the steel beam must also be controlled. Make equal deviations between the roof frame and the center line at both ends of the column, so that all steel roof frames are on the same centerline.
Related safety technical measures
A. Measures to prevent crane tipping
a. The hoisting road must be level and solid, and the underground tomb and loose soil layer must be treated. If it is necessary, pave the road wood or roadbed to prevent the crane from directly rolling the wall foundation or ground beam.
b. Overload hoisting should try to avoid. However, when it is unavoidable in some special circumstances, measures should be taken, such as pulling the cable wind on the crane boom or increasing the balance weight at its tail. After the crane is increased in balance, when unloading or no-load, the boom must fall within 60°of the horizontal line. The operation should be carried out slowly.
c. Inclined hanging is prohibited. The diagonal crane mentioned here means that the heavy object to be lifted is not directly under the top of the crane boom. Therefore, when the sling that binds the heavy object is hung on the hook, the hook block is not perpendicular to the ground, but forms a horizontal line. Angle. Inclined hoisting will cause the lifting load and the steel wire to force out of the groove, and even cause the rope to break. Inclined cranes can also cause heavy objects to swing quickly after leaving the ground, which may injure people or other objects.
d. Inclined hanging is prohibited. The inclined hanging mentioned here means that the heavy object to be lifted is not directly under the top of the crane boom. Inclined cranes can also cause heavy objects to swing quickly after leaving the ground, which may injure people or other objects.
e. Try to avoid the crane driving at full load. If you need to drive with a short load, you can only hoist the component about 30cm from the ground, and move slowly.
f. It is forbidden to carry out hoisting operations in severe weather such as strong winds.
B. Measures to prevent falling from high altitude
a. The operator must use the safety hanging basket correctly when splicing steel beams at high altitudes, and ensure that the safety belt is fastened.
b. When using a crowbar at high altitude, people must stand firmly. If there is a scaffold nearby or a component has been installed, hold it with one hand and operate it with another one. The insertion depth of the crowbar should be appropriate.
c. The ladder used for climbing must be firm and must be fastened with a rope to the fixed components. The angle between the ladder and the ground is generally 65°-70°.
d. Operators cannot wear hard-soled leather shoes to work at heights.
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