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Replace the lower bearing of the door machine with the jacking method

Source: Bearing network time: 2014-04-14

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Most of the 524 door machines in Shanghai Port have been used for more than 20 years; gaps occur due to increased wear; the oscillations and impacts of the door machine are increased; thus, the operating period of some lower bearing supports is greatly shortened. After the lower bearing is damaged; Conventional repair method is to use the floating crane to disassemble the variable amplitude structure and reverse the structure; then replace the lower support bearing. This method is more expensive; it takes a long time; the cost is large. The top support method is used to replace the lower support bearing. It is a good way to save labor, save time and save money.
1. Determine the center of gravity of the door machine and the stability of the center of gravity in the process of jacking. Some of the combination of the boom, the rotating column, the machine room, etc. The center of gravity of the combined boom is basically horizontally moved during the variable amplitude process. The door machine reverses some of the center of gravity. When the boom is at the maximum undulation, it is basically located in the middle of the door machine reversal. When the boom is at the minimum undulation; the reversal of some center of gravity is located at the back of the middle of the rotation (with the boom as the front; the machine room) For the latter). The aspiration orientation of the unpacking construction should obviously take the position of the boom when it is located at the maximum undulation. It can be investigated through the field; it proves that the azimuth is the equilibrium position of the ambition. The boom is at the minimum undulation; the front roller and raceway There is a gap; then the roller is pressed against the raceway. The boom is at maximum undulation; the front and rear rollers and raceways are slightly open; the clarification is in equilibrium.
In the process of jacking up; it is impossible for two jacks to rise evenly together; this may result in the reversal of the door machine and some movement of the center of gravity. The working conditions of the upper support do not change; it is completely acceptable due to the unbalance of the jacking. Reverse some skew loads.
After the jacking process and the completion of the jacking; the wind may cause the door machine to reverse some changes; the lifting point is moved laterally; the construction is unsafe; the construction is safe and reliable; the safety method is adopted. Pull a windproof rope at the top of the trunk of the door machine; the other end of the windproof rope is fixed to the ground; the original jack of the door machine is screwed down into the windproof pin support seat to ensure that the door machine reverses during the construction process. Safe.
2. The selection of the jacking point and the determination of the crown height are investigated on the door machine; it is found that there is no jacking condition on the door machine; the cross beam of the door machine can be supported by the local area; the selection space is large; the construction conditions are good; The load is large. Finally, the contact between the cross beam and the door leg is selected as the support point of the jack.
The slope of the lower column is the ascending point of the ambition; however, the slanting surface cannot be directly used as the lifting point; it is necessary to make a lifting bracket (composed of two angle steels and one steel plate) to weld the slanting column.
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