JPS60122683A - Hanger for structure - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a device for lifting structures, and more specifically, for lifting internal structures of a nuclear reactor temporarily for periodic fuel exchange or inspection of the reactor. Concerning lifting equipment used when moving.

[Technical background of the invention]

A conventional lifting device for moving internal reactor structures (hereinafter simply referred to as structures) will be explained with reference to FIGS. 1 and 2.

FIG. 1 shows a state in which, in order to move the structure 1, a lifting device 2 is attached to the 84 structure 1, and the structure 1 is lifted by a load projector 4 via a wire rope 3.

The lifting tool 2 has one end fixed to each other to form a center, and has free ends projecting radially outward from the center, and has four linear protrusions 5 arranged on the same plane. A main body 6 provided above, an air cylinder 7 forming a bottle axis movement mechanism attached to the -F surface of each overhang 5 in the axial direction, and a piston rod 8 fixed to the tip of the air cylinder 7. A separate remote control bag (ii'i, not shown) for remotely controlling the operation of the air cylinder 7 is provided.

The projecting portion 5 is made of H-beam steel having desired rigidity, and a socket portion 10 is formed at its free end. The socket part 10 is provided with a hanging hole 11 near the upper end, and three socket plates 12 are fixed at right angles to each other at intervals in the axial direction of the overhang part 5 at the lower end. 9 is provided with a pin hole 13 through which it is inserted.

The work of transporting the structure 1 out of the reactor using the lifting tool 2 is carried out in the following steps.

First, the lifting device 2 hoisted horizontally via the wire rope 3 is lowered by the speculator 4, and the upper part of the lifting fitting 14 fixed to the structure l to be lifted is lifted from the socket plate 12.12 of the lifting device 2. be located in between. In this case, the pin shaft 9
is in a state where it is pulled out to the air cylinder 7 side, as shown in the double-dot chain diagram. When the lifting tool 2 descends and the upper end of the lifting tool 14 comes into contact with the lower surface of the socket part 10, the air cylinder 7 is operated by a separate remote control device,
The pin shaft 9 is moved in the axial direction and inserted into the pin hole 13 of the socket plate 12 and the hanging hole 15 of the hanging fitting 14. After the structure 1 and the lifting tool 2 are connected in this manner, the lifting tool 2 is raised to lift the structure 1 and carry it out to a desired location. Next, the pin shaft 9 is moved in the pulling direction by the air cylinder 7, and the lifting tool 2 is separated from the structure 1.

When the structure 1 is returned to its original position within the reactor after the fuel exchange or inspection is completed, the procedure similar to the above-mentioned removal procedure is carried out.

[Problems with background technology]

The large-scale removal work of the structure using the conventional lifting tool 2 is as described above, but if the air cylinder 7, which is the bottle axis movement mechanism, breaks down after the structure 1 is transported into the reactor, the pin If the shaft 9 cannot be pulled out from the lifting hole 5, it will be impossible to separate the lifting tool 2 from the structure 1, and the reactor will not be restarted until this separation is completed by repair or other means. There will be a situation where the start time will be significantly delayed. Incidentally, failures of the bottle shaft moving mechanism include, for example, galling between the cylinder inner wall surface of the air cylinder 7 and the smooth surface of the piston head, deterioration of the air leak prevention member, or damage to the air piping.

Since the movement of the structure 1 is carried out underwater to reduce the amount of radiation exposure to the human body, if a failure occurs in the bottle shaft movement mechanism of the lifting device 2 as described above, the repair must be carried out by the worker. Since it cannot be carried out in close proximity to the parts, the work is extremely difficult and requires a large number of workers and man-hours.

[Purpose of the invention]

This invention was made in order to solve the above-mentioned problems in the conventional lifting device used during periodic fuel exchange or inspection of a nuclear reactor. Another object of the present invention is to provide a lifting tool that can reliably separate a structure and the lifting tool.

[Summary of the invention]

In the structure lifting device according to the present invention, the bottle shaft moving mechanism in the conventional lifting device is attached to the main body of the lifting device so as to be movable in the axial direction of the pin shaft, and the bottle shaft moving mechanism is unlocked. The above object is achieved by providing a locking mechanism that freely locks onto the main body, and mounting a preliminary movement mechanism on the main body that allows the bottle shaft moving mechanism and pin shaft to move integrally.

[Embodiments of the invention]

An embodiment of this invention will be explained with reference to FIGS. 3 and 4.

Here, the same parts as shown in FIG. 2 are denoted by the same reference numerals, and a part of the explanation thereof will be omitted, and the above explanation regarding FIG. 2 will be used instead.

The cylinder support base 21 fixes the air cylinder 7 on one side thereof through a mounting member 22, and is loaded on the overhang 5 of the main body 6 so as to be movable in the axial direction thereof.

At the end of the -F plane 4111 line direction of the cylinder support base 21,
Each one approximately L-shaped lock plate 23,
A stud bolt 24 set into the cylinder support base 21 and a compression coil spring 25 fitted into the outer periphery of the stud bolt 24
The lock plate 23 is attached in a downwardly biased state, and one vertical side of the lock plate 23 is aligned with the mark 1 carved on the overhang 5.
8] By fitting into the Yu groove 26, the cylinder support base 21 is fixed on the protruding 81 (5).The lock plate 23, stud bolt 24, compression coil spring 25, and locking surface 26 are A locking mechanism 27 is configured to releasably lock the air cylinder 7, which serves as a mechanism for moving the shaft 9, to the main body 6.

The preliminary air cylinder 30, which constitutes a preliminary movement mechanism for the pin shaft 9, has its center axis aligned with the pin axis 9 of the air cylinder 7.
It is placed on the extension line on the opposite side and is fixed downward to the overhanging part 5. The installation position of the preliminary air cylinder 30 is the locking mechanism 2.
The piston rod 31 of the preliminary air cylinder 30 is adjusted so that its tip can be connected to the right bottom wall of the air cylinder 7 in the most protruding state with respect to the air cylinder 7 fixed to the overhang 5 via the air cylinder 7 . In normal use, the air cylinder 7 is fixed at a fixed position on the overhang 5 by the locking mechanism 27, but by feeding compressed air into the preliminary air cylinder 30 in the direction in which the piston rod 31 protrudes, , the fixation of the air cylinder 7 becomes more secure. Furthermore, since the air piping (not shown) to the air cylinder 7 is made of flexible nylon, there will be no obstruction when the air cylinder 7 is moved.

Similarly to the air cylinder 7, the operation of the preliminary air cylinder 30 is remotely controlled by a separate control device (not shown).

The operation of the lifting device having the above structure according to the present invention will be explained next.

Also in this lifting device, the pin shaft 9 is connected to the air cylinder 7.
The lifting tool is connected to the structure 1 by being inserted into the hanging hole 15 of the lifting fitting 14 of the structure 1, and by pulling out the spin shaft 9 from the hanging hole 15 by the air cylinder 7, the lifting tool is removed. The separation of the structure 1 from the lifting device 2 is exactly the same as in the conventional lifting tool 2 which does not include the locking mechanism 27 and the preliminary air cylinder 30, so a detailed explanation thereof will be omitted, and the lifting tool 2 will be separated from the structure 1. Instead of the above explanation, only the functions of this lifting tool that differ from the lifting tool 2 will be explained below.

After moving the structure 1 lifted by this lifting tool, if a failure occurs in the air cylinder 7, which is the mechanism for moving the pin shaft 9, and the lifting tool and the structure 1 cannot be separated, the lock plate 23 should be removed. , by pressing down one end against the compression coil spring 25 using the operating rod 35 shown in FIG.
Cylinder support 21 and therefore the overhang 5 of the air cylinder 7
Release the lock on. Next, the preliminary air cylinder 3
0 and moves the piston rod 31 in the retracting direction, the air cylinder 7 and pin shaft 9 can be moved together, so the pin shaft 9 is pulled out from the suspension hole 15 and the structure 1 and the lifting tool are removed. To separate.

FIGS. 5 and 6 show other embodiments of the invention.

Here, parts that are the same as those shown in FIG. 3 are given the same reference numerals, and some explanations thereof are omitted, and the above explanation regarding FIG. 3 is used instead.

FIG. 5 shows an example in which a guard cable mechanism 40 of a known structure is used as a reserve moving mechanism in place of the reserve air cylinder 30 in FIG.
) One end is fixed to the right bottom wall of the air cylinder 7, and the other end is connected to a gear mechanism (not shown) mounted on the main body 6. The operation of the guard cable mechanism 40 is remotely controlled by a separate control device 1.

FIG. 6 shows an example in which a pulling wire rope mechanism 50 is used as a preliminary rear movement mechanism in place of the preliminary air cylinder 30 in FIG. It is fixed to the wall, and the middle part is an overhanging part 5.
is supported by a guide wheel 52 rotatably pivoted on the lower surface of the
The other end is fixed and tensioned to a handle 53 supported on the upper surface of the overhang 5.

The engagement IF of the chivalry cylinder 7 with respect to the overhanging portion 5 is released via the engagement mechanism 27, the gear mechanism of the guard cable mechanism 40 is operated by remote control, and the gear mechanism of the guard cable mechanism 40 is operated by remote control. By pulling up the handle 53 by an appropriate means, the air cylinder 7 and the pin shaft 9 are integrated into one body, and the pin shaft 9 is removed from the suspension hole 15 of the suspension fitting 14, just as in the case of using the preliminary air cylinder 30. The extraction can be moved in the direction of extraction.

〔Effect of the invention〕

A device for lifting a structure according to the present invention includes a pin shaft that is removably inserted into a hanging hole of a lifting metal fixed to a structure, a mechanism for moving the pin shaft in the axial direction, and a main body that supports these. In a lifting device, the bottle shaft moving mechanism is attached to the main body so as to be movable in the axial direction of the pin shaft, the locking mechanism locks the bottle shaft moving mechanism to the main body in a freely unlockable manner, and the pin shaft and the bottle shaft are moved. By equipping the main body with a preliminary movement mechanism that moves together with the mechanism, even if the bottle axis movement mechanism fails, the pin axis can still move together with the bottle axis movement mechanism using the preliminary movement mechanism (h). Since the pin shaft can be pulled out from the lifting device of the structure, it is easy to use when the bottle shaft moving mechanism is normal, and even if there is a failure, the structure and the lifting device can be reliably separated. However, when a conventional lifting device is used and the bottle shaft movement mechanism breaks down, it takes a lot of man-hours to separate the structure and the lifting device, resulting in the restart of the reactor. This has the effect of eliminating a significant delay in the start time, and also reduces the amount of radiation exposure of workers because no additional man-hours are required to separate the structure and lifting equipment. effective.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of the lifting state when a reactor internal structure is lifted by a conventional lifting device, Fig. 2 is an enlarged front view of the main part of the lifting device 2 in Fig. 1, and Fig. 3 4 is an enlarged front view of the main part of FIG. 3, and FIGS. 5 and 6 are front views of main parts of other embodiments of the invention, which are different from each other. It is. 1... Reactor internal structure, 3... Wire rope, 5
... overhang, 6 ... main body, 7 ... air cylinder (
bottle shaft moving mechanism), 9... pin shaft, 14... hanging fitting, 15... hanging hole, 27... locking mechanism, 30...
・Spare air cylinder (spare bottle shaft movement mechanism), 40...
- Guard cable mechanism, 50... Pulling wire rope mechanism. (7317) Agent Patent attorney Katsusuke Norichika (and 1 other person) Figure 1

Claims (4)

[Claims] (1) A main body that has a horizontally extending portion and is suspended horizontally via a wire lobe, and a main body that is attached to the main body so as to be movable in the direction of its own axis and is inserted into a hanging hole of a hanging metal fitting fixed to the structure to be lifted. A structure comprising a pin shaft that is removably inserted and a remote control movement mechanism that moves the pin shaft in its axial direction, and that lifts the structure via the pin shaft and a front self-lifting fitting. In the lifting device, the moving mechanism is mounted on the main body so as to be movable in the axial direction of the pin shaft, and the moving mechanism is freely disengaged from the main body. The main body is equipped with a locking mechanism that locks the locking mechanism, and a remote 抛II Mikobi moving mechanism that integrates the pin shaft and the moving mechanism and moves both in the axial direction of the pin shaft. equipment for lifting structures. (2) The structure lifting device according to claim 1, wherein the preliminary movement mechanism is a preliminary air cylinder. (3) The device for lifting a structure according to claim 1, wherein the preliminary movement mechanism is a guard cable mechanism. (4) The lifting device for a structure according to claim 1, wherein the preliminary movement mechanism is a pulling wire rope mechanism.