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                  Because cement cast-in-place is seldom used by people, we emphasize the way of channel steel. The following construction method is based on the square of your indoor plane.
                  1. the key point of channel steel floor is the fixed ends of channel steel.
                  There are three main types of fixed methods
                  One is to make an angle steel on the wall, and use the expansion screw to lock it on the wall, then use the channel steel to fix it on top, and it can also be fixed by planting bar. This method is confined to the wall at both ends, or just with a beam passing through the wall. The expansion screw is fixed to the wall with the expansion screw, and the interval of the expansion screw is not more than 200mm.
                  The two way is to first punch a hole on the wall, then extend the channel into the wall, and directly bear the weight of the channel steel. This method is limited to bearing walls or thicker shear walls.
                  The three way is to directly erect another channel steel to support the horizontal channel steel, and the vertical channel steel must be fixed on the wall. This method should consider the load-bearing capacity of the floor in which the vertical channel steel is located, so that more support should be distributed, and the force should not be concentrated on a few channel steels. The third method requires channel steel instead of the angle steel used in the first practice. Generally fixed on the longest sides, if the longest two sides are laid in parallel without fixed conditions, they can also be laid on the shortest sides.
                  2. to solve the fixed point of channel steel, the next thing to be solved is the arrangement of the main keel.
                  Generally speaking, for the living room, it is recommended to use 120 x 60 x 6mm or above channel steel to act as the main keel. The main keel should be laid in parallel with the shortest side, about 500mm.
                  Channel steel must be placed above the wall, and the gap between the channel and the wall should not exceed 10mm. The channel steel is fully welded over the cross gear. If there is no fixed condition in parallel with the shortest side, it can also be laid in parallel with the longest side.
                  3. soldering the accessory keel between the main keel
                  The side keel can be made of equilateral angle steel with 50x50x4mm or more specifications.
                  The side keel is fully welded on the main keel, the plane is the same, and is perpendicular to the main keel, and the recommended interval is 300mm (maximum).
                  For safety reasons, it is advisable to weld a small angle steel leftover in the lower part between the keel and the main keel for safety.


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