Pile leg pulling and rolling-over process for heavy lifting mechanism

Abstract

The invention relates to a pile leg pulling and rolling-over process for a heavy lifting mechanism. The pile pulling process for a pile leg comprises the following steps of preparation work before hoisting, specifically, a floating crane is arranged, a locking device is released, and an upper opening encoder is detached; then a lifting system is disconnected from a power supply, and a brake is turned on; and a rolling-over tool and a holding tool are arranged in place; pile pulling, specifically, the pile leg is lifted to a limiting altitude and held through the floating crane, the pile leg is lifted upwards continuously by utilization of a lifting device and protected by the floating crane upwards synchronously, and then the pile leg pulling work is finished; and pile leg rolling-over, specifically, after the pile leg is pulled out slowly, a lower opening of the pile leg is slowly placed onto the rolling-over tool, and the pile leg is rolled over and then detached from a hook after being laid onto the holding tool. The pile leg pulling and rolling-over process for the heavy lifting mechanism has the advantages that pile leg pulling operation can be finished by only utilizing the single floating crane, and only a few devices are required; the rolling-over tool is adopted as the rolling-over tool for the pile leg, and pile leg rolling-over operation can be finished through the single floating crane and the single rolling-over tool only; and the holding tool is arranged, so that stability when the pile leg is arranged horizontally after being rolled over is well guaranteed.

Description

technical field [0001] The invention relates to the technical field of heavy-duty open-type rack and pinion transmission, in particular to a pile leg pulling and turning process. Background technique [0002] The lifting mechanism of the riprap leveling vessel and the jack-up drilling platform is a heavy-duty open rack and pinion transmission structure. According to the pile leg requirements of the jack-up drilling platform, the number of pile insertion / extraction on the platform shall not exceed 5 times a year; while the lifting mechanism operates frequently, the rack and pinion are in low-speed, heavy-load, and impact conditions for a long time, and piles are frequently inserted and pulled under high load The wear of gear and rack is accelerated by operation; after testing, the wear value of local leg rack has exceeded the design allowable value. The amount reaches 15mm (maximum allowable 5mm). In view of the wear and tear of the pile leg, it is imperative to replace and ...

AI Technical Summary

Problems solved by technology

According to the pile leg requirements of the jack-up drilling platform, the number of pile insertion / extraction on the platform shall not exceed 5 times a year; while the lifting mechanism operates frequently, the rack and pinion are in low-speed, heavy-load, and impact conditions for a long time, and piles are frequently inserted and pulled under high load The wear of gear and rack is accelerated by operation; after testing, the wear value of local leg rack has exceeded the design allowable value. The amount reaches 15mm (the maximum allowed is 5mm). In view of the wear and tear of the pile leg, it is imperative to replace and repair the pile leg. However, the length of the pile leg is long, and it is extremely difficult to pull out the pile and turn over.

Images