Metal working – Means to assemble or disassemble – With control means energized in response to activator...
Patent
1998-07-22
2000-03-28
Echols, P. W.
Metal working
Means to assemble or disassemble
With control means energized in response to activator...
29714, 29240, B23P 2100
Patent
active
06041491&
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a lifting jack, a method of coupling suspending rods and a lift control method, more particularly, to: a lifting jack having means for continuously attaching and detaching the end rod in order to adjust the length of the suspending rod which is elongated by the screwed coupling, and means for continuously removing and depositing the rod in accordance with attaching and detaching the rod, when the suspending rod, which is used in a lifting operation for a boiler module of a large scale electric-power plant or the like, is lifted up and down by the jack; a method of coupling suspending rods; and a lift control method for lifting up and down the boiler module or the like while the lifting jacks are controlled in synchronism.
BACKGROUND ART
FIGS. 47 show a conventional suspending rod, used for lifting up a massive body, for example, when power-generation facilities are set up. A suspending rod 10, elongated by screwing plural rods 10S to each other in the axis direction, is suspended from a beam portion, located at high elevations, of a steel structure to be used when a module of a boiler, associated with piping installation on the ground, is moved upward step by step in response to the associating stages on the ground and moved down as necessary. The rod 10S as a component of the suspending rod 10, which has a configuration continuously linked with plural top-shaped supported portions 12 in the axis direction, has a male screw part 14 at the end thereof and a female screw part 16 at the other end which engages with the male screw portion of another rod. Each rod of the suspending rod 10 is made to have the length of about 5 m in consideration of a storage space of rods, convenience or handling properties for transferring them between workplaces, workability in the lifting operations for the massive body, and so on. In the use of the suspending rod 10, the plural rods 10S are coupled by screwing each other in the axis direction, and the massive body is lifted up by a jack while being suspended at the lower portion of the suspending rod 10.
More specifically, as shown in FIG. 48, steel columns 22 are stood up around a heavy steel structure 20. A temporary beam 24 is horizontally mounted on the top of the steel column 22 to project from the top of the steel column 22. A center hole type jack 26 is placed on the temporary beam 24 and supports the suspending rod 10 attached with the heavy steel structure 20, such as a module of a boiler, at the lower portion thereof. The suspending rod 10 is structured by coupling the rods 10S shown in FIG. 47 so that the length of the suspending rod 10 corresponds to the height up to which the structure 20 is lifted. As shown in FIG. 49, the center hole type jack 26 lifts up the structure 20 by pushing up the suspending rod 10 with using the supporting part 12 formed in the rod 10.
The lifting steps are as follows. As shown in FIG. 49(1), the suspending rod 10, suspending the structure 20, is supported by an upper chuck 34, and the load of the structure 20 is received by the upper chuck 34, and a lower chuck 36 is released. In this state, a ram 32 is worked and pushes up the suspending rod 10 for a rod (one of the supported portions 12) so as to lift up the structure 20 through the suspending rod 10. The lower chuck 36 is closed when the suspending rod 10 is moved up for one rod, and the ram 32 is moved down so that the lower chuck 36 receives the lifting load (the suspending load) through the supporting part 12. When the lower chuck 36 supports the suspending rod 10, the upper chuck 34 is opened to move further down the ram 32. When the upper chuck 34 comes under the next supported portion, located beneath the supported portion supported previously by the upper chuck 34, the upper chuck 34 is closed again to support the suspending rod 10, and the lower chuck 36 is opened, and the above steps are repeated. When the coupling point of the rod 10 reaches above the center hole type jack 26, the lifting operations are intermitted in order
Fukushima Shigeru
Ishikawa Yusuke
Kawaguchi Shigeyoshi
Koide Hideo
Echols P. W.
Hitachi Plant Engineering & Construction Co. Ltd.
Hong John C.
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