What are the requirements for the operation of the

2022-07-30
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What are the requirements for tower crane operation

(1) when lifting a heavy object for the first time, do not lift it to the required height immediately after lifting. Trial hoisting shall be carried out first, and the hook shall be lifted slowly (to reduce the inertia force). When the weight is about 50cm away from the ground, it shall stop for a while, and then continue to lift when it is considered that there is no problem

(2) when the wire rope sling is hung and the wire rope of the lifting hook is tightened, the operator shall immediately stay away from the object to be lifted, and shall not stand under the boom. Prevent people from being injured by heavy objects falling and arm collapse

(3) the driver can start operation only after receiving the clear signal from the commander, and ring the bell before action. If the signal is not clear, do not operate at will

(4) it is generally stipulated that each shift of tower crane shall have two drivers, one driver shall operate and the other shall monitor on the ground to avoid accidents due to improper command

(5) before lifting the heavy object, confirm that the real weight of the heavy object does not exceed the specified load, and overload operation is not allowed

(6) it is not allowed to lift buried and frozen objects, otherwise overload accidents will occur due to unclear weight

(7) reduce the energy consumption of 100million tons of standard coal. It is not allowed to lift heavy objects obliquely to avoid instability of the tower crane

(8) when the jib changes the elevation angle, it must be carried out without load. During luffing, it is not allowed to do other actions at the same time

(9) fast slewing is prohibited, because too fast slewing speed will cause: first, it is difficult to put components in place; Second, the torque of the tower body is too large; Third, excessive centrifugal force of heavy objects is prone to danger

(10) when two tower cranes are operating on the same track, a safe distance shall be maintained

according to the provisions of gb5144-85 (safety code for tower cranes in buildings), "the minimum erection distance between two cranes shall ensure that there is at least 2m between the boom end of the lower crane and the tower body of the other crane; in any case, the vertical clearance between the upper crane and the lower crane shall not be less than 2m" 。

for two tower cranes with the same height, the distance between the ends of the boom shall be greater than 4m. When two tower cranes operate at the same time, the distance between the hoists shall not be less than 2m

swing angle (11) when the tower crane is running on the track without increasing the vehicle weight or using adhesive, it is prohibited to lift heavy objects on the 90 ° curve.

when the tower crane is running, the four support points travel along the curve track. Due to the different curvatures of the inner and outer tracks, the horizontal displacement of the traveling wheel (the displacement distance greatly exceeds the normal gap between the traveling wheel rim and the steel rail) is caused. The displacement value is related to the turning radius, The larger the radius, the smaller the displacement value. For example, tq3-8 tower crane makes use of the movable end of the gantry of the base and the pivot device of the traveling mechanism. The trolley can rotate an angle around the axis and travel on the inner rail (the radius of the inner rail is small) to overcome the common turning due to different curvature radii. Under such conditions, the tower crane will be unstable if the heavy objects are hoisted again. However, when the radius is large enough, the normal working conditions can be met and the lifting operation can still be carried out

(12) in case of severe weather such as strong wind during operation, the operation shall be stopped, the hook shall be raised and the rail clamp shall be clamped. When the wind force reaches level 10 or above, the hook falls down to hook the track, and four steel ropes are pulled on the structural frame of the AD converter tower and fixed on the nearby buildings

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