L48A1 Mast SectionExamples of safety accidents caused by unqualified tower crane foundation
1. The foundation of tower crane is set in the place with uneven settlement, or the concrete is poured when the trench is not compacted, which causes local subsidence and the remedial measures are not in place.
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2. In particular, the tower crane shall be installed in the site with basement and underground ditch for construction. The foundation is too close to the slope, and the foundation is too close to the edge of the foundation pit. It is easy to slide down the tower after being loaded or heavy storm.
3. For the tower crane close to the slope, pile driving or reinforcement must be carried out before pouring the foundation. Although the pile was driven down, some piles could not bear the load in space, resulting in local collapse and tower collapse.
4. After the foundation is poured, the concrete has not been maintained and can not meet the strength requirements.
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5. There is no cross bar inserted in the anchor bolt hook, which causes local concrete damage near the anchor bolt hook head, and the bolt tension can not be transmitted; the fastening bolt has broken teeth, making the tower crane installation and connection not firm; the specification of the selected connecting bolt is too small, and the bearing tension is not enough.
6. The stable storage of pressure weight balance is insufficient, and it is easy to tip over the tower in case of overload.
7. Forget to lock the rail clamping device after work, release the brake of the rotating mechanism, and collapse the tower in case of storm at night.
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