The fixed lifting platform is provided with scissor support, which can enhance the longitudinal steel-plastic of the lifting platform, prevent the lifting platform from tilting, and help to improve the bearing capacity of the vertical pole. The test shows that the shear support can increase the bearing capacity by more than 10%.
We can prove through a simple experiment that when a square made of four sticks is tied and a horizontal force is applied to one side, the size of the stick does not change, but its geometric shape changes from square to parallelogram, indicating that the quadrilateral is a geometrically unstable figure. When a diagonal rod is tied to the middle of the quadrilateral, the graph forms a stability, namely triangle, which is a geometrically stable graph. At this time, the horizontal force does not change the geometry of the graph. The fixed lifting platform is just a quadrilateral composed of many vertical bars and horizontal hinged, so the scissors support must be added to increase its stability. In fact, even if there is no longitudinal horizontal force, the lifting platform will also tilt under the vertical load, because the vertical load is not uniform.
Scissor support in the lifting platform is to bear the role of the pull rod or pressure rod, and the size of the rod support or under pressure is mainly by the anti-slip ability of the fastener, so in the scissor support inclined rod fastener set more, the better its stress effect, the extension of the inclined rod using lap joint, lap joint no less than 2 rotary deduction, lap length of 1 meter.
First, the hydraulic lift cargo ladder for the construction of more than 4 meters, must be with the construction layer in accordance with the requirements of the 3 meters wide safety net;
Second, during the construction of the hydraulic lifting platform, a 3-6 meter wide double-layer safety net must be fixed on the first floor, and the safety net should be 60-80 cm higher than the inner mouth.
Thirdly, the safety net of the lifting platform shall be supported by composite steel pipe Angle frame and collapsed by steel wire rope. The outer edge of the safety net should be as straight as possible, and the inner mouth should be tied firmly with the building. The gap should not be more than 150 mm.
Fourth, when lifting cargo ladder construction, do not need to install a safety net outside the first floor, good must be fixed every 4 layers a 300 mm wide safety net;
Fifth, the elevator Wells, daylighting Wells and spiral staircases of the projects under construction must be equipped with protective railings. A safety net shall be fixed on the first floor of the well head, and one safety net shall be fixed on every fourth floor.
Sixth, hydraulic lifting platform first floor safety net height from the ground, if the safety net is 3000 mm wide, not less than 3 meters; If the net is 6000 mm wide, the height from the ground shall not be less than 5 meters.
The horizontal safety net shall be braided with hemp rope, palm rope or nylon rope with a diameter of 9 mm, generally 3 meters wide and 6 meters long with a mesh of about 5 centimeters. Each good safety net should be able to withstand the impact load of not less than 1600N, the requirements of impact after the net rope, tethered rope, side rope. No safety net that is mouldy, rotten or leaky shall be used.