Screw rod selection and spacing issues. There are 6 and 8 points for the boom. For the aluminum square with a small size, 6 booms can be used. The distance between the booms is mainly related to the thickness and size of the aluminum square. If the thickness of the aluminum is relatively thick, the weight of the keel and the weight of the keel have relatively large requirements, so we must make the keel fixed and strong. Generally, several hangers are hoisted above the keel.
The expansion screws are matched to the boom. Six expansion bolts are selected for the six booms.
The choice of the main keel. The main keel is not used in many aluminum square hoisting, but more stringent engineering is required. Then you need to hang the hanging keel such as pendants. Installation with the main keel is cumbersome, but the level of installation is higher.
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