When laying the foundation of the tower crane suspension, it must comply with the standards and specifications
When laying the foundation of the tower suspension track, it is necessary to comply with the standards and specifications of the tower suspension. Below, this site according to many years of experience in the production and use of tower crane, in the actual work summed up a set of standards not only meet the requirements, but also simple and easy to do, effective methods, hope to give tower crane users help.
(1) The ZBJ 80012-89 Regulations for the Operation and Use of Tower Cranes stipulate that the particle size of the gravel base should be 20 to 40 mm, and the soil content should not exceed 20 % to ensure the requirements for drainage, ventilation and friction of the roadbed.
GB5144-94 "Safety Regulations for Tower Cranes" stipulates that the gravel foundation must be flattened and mashed, and the rail pillow should be filled with gravel.
The above provisions are not only applicable to the construction of the tower suspension track foundation, but also include the entire process of the use of the tower suspension foundation. In order to prevent the fall of gravel caused by artificial steps, there is an unfullness of the interrail gravel and the loosening and depression of the sleepers. We finished laying the track and built the surrounding walls with bricks. The height is the same as the top surface of the sleeper. The bottom of the wall leaves a small hole of 100 × 100mm every 3M.
(2) GB5144-94 stipulates that the two rail joints are staggered and the distance is not less than 1.5 M.
At the time of installation, if one end of the track is 1.5 m wrong, 3M invalid tracks appear at both ends, and sometimes the site is not allowed, it is difficult to meet the requirements. We disconnect a track from the middle and install it on both ends of the track on one side, which not only meets the standard requirements, ensures that the end is neat, but also makes full use of the track and construction space.
(3) GB5144-94 stipulates that after the crane track is installed, the inclination in the vertical and horizontal direction of the top surface of the track is not greater than 1/1000.
When the vertical and horizontal inclination of the top surface of the orbit is satisfied, it is prone to the phenomenon that both sides of the longitudinal track are tilted in the same direction, that is, the slope phenomenon, so the absolute value of the longitudinal inclination must not exceed 10mm.
(4) ZBJ 80012-89 stipulates that: At no less than 1M of rails at both ends of the track, a stop device to prevent the crane from derailment is reliably installed. The stop device shall meet the following requirements:
1 There is enough strength;
2 The height is not less than 2/3 of the diameter of the running wheel;
There should be a certain buffer effect.
In actual work, the track can be gradually raised by 30mm within 2m at both ends of the track, and a sleeper can be fixed to the track with a steel bar at 1M at the end of the track. This method not only satisfies the requirements for the strength, height and buffer of the gear stop device, but also can effectively prevent the accident caused by the wind that caused the tower to be suspended and derailed.
