JP2004149252A - Installation method for hoist and crane foundation - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To take a safety measure against such a trouble that a crane may be fallen down when vibration is applied from the outside thereto by earthquake or the like when large equipment is carried in and out of a building by using a carrying crane in a nuclear power plant. <P>SOLUTION: A crane 1 for carrying the equipment is installed on a crane foundation 20 having base isolation function, and the equipment 3 is carried out of and carried in a carried-out/carried-in position by using the crane for carrying the equipment. The crane foundation 20 is formed by installing a base isolation device such as a laminated rubber 8 on an improved ground 7 and installing a crane installation plate 2 on which the crane 1 is fixed on the base isolation device. The crane installation plate 2 can be fixed, as necessary, to the improved ground 7 by a horizontal fixing device 10. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method of installing a hoist and an improvement of a crane foundation.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, in a nuclear power plant or the like, a large-sized device having a considerably large weight and size, such as a pressure vessel and a turbine generator, is carried into a building of a nuclear power plant, and is installed to assemble a plant. In some cases, the large-sized equipment may be carried out of the nuclear power plant for repair or replacement.
[0003]
In order to carry this large equipment into and out of the nuclear power plant building, a crane foundation is installed near the nuclear power plant building, a large crane for carrying in and out is installed on this crane foundation, and this crane for carrying in and out is installed. A method of carrying in and out a large device by using the device has been adopted.
[0004]
In order to assemble a large crane for loading and unloading, first place the crane for disassembling and disassembling on the crane foundation, then assemble the crane for loading and unloading at a predetermined place on the crane foundation, and then disassemble it. I am trying to get rid of the crane.
[0005]
The loading / unloading cranes to be used include a mobile type and a fixed type. For example, a large crawler crane for a mobile type, a large derrick crane for a fixed type, and the like are used.
[0006]
In general, when lifting equipment using a crane, the crane structure itself must be provided with an earthquake-resistant structure or an earthquake-resistant support structure must be used to maintain the strength of the crane against the load and vibration acting on the crane. Measures have been taken. (For example, see Patent Document 1)
[0007]
[Patent Document 1]
JP-A-2000-44168 (pages 3-4, FIGS. 1-5)
[0008]
[Problems to be solved by the invention]
However, the above-described method for carrying in / out large-sized equipment using a crane has the following problems.
In the conventional method, when loading and unloading large equipment, the determination of whether or not the loading and unloading work is possible based on conditions such as the working radius of the crane, the equipment weight, and the ground pressure is sufficiently examined in advance from the work planning stage. However, safety measures for accidents in which the crane collapses due to sudden externally acting vibrations such as earthquakes or wind loads have not been considered much.
[0009]
Further, providing the crane itself with an earthquake-resistant structure not only complicates the structure of the crane, but also increases the complexity and troublesome design work such as calculation of the strength of the crane, which is not very preferable.
[0010]
Therefore, in the method of loading and unloading large equipment using a crane, the crane cannot withstand externally applied vibrations such as an earthquake or wind load, and the vibration energy causes the crane body to collapse on the crane foundation and There is a concern that the plant may fall into a running operating plant or plant building.
[0011]
If a crane collapses and falls into the reactor building of an adjacent operating plant, the operating floor wall or ceiling of the building is destroyed and the plant is seriously damaged. In some cases, radioactive materials may diffuse out of the spent fuel pool outside the building, causing radioactive contamination.
[0012]
This also means that not only cranes for loading and unloading equipment, but also crane for dismantling when crane assembling and disassembling fall into the reactor building of the adjacent operating plant due to externally applied vibration such as earthquake or wind load. It is possible that this could cause a similar accident.
[0013]
Therefore, when loading and unloading large equipment, suddenly from outside, such as earthquakes or wind loads, during the entire period from assembling the crane for loading and unloading large equipment to during use and dismantling. It is necessary to take safety measures so that it does not collapse due to the vibrating vibration.
[0014]
The present invention solves the above problems, and maintains a sufficient strength against vibrations suddenly acting from the outside, such as an earthquake or wind load, and provides a safe method of installing a hoist and the foundation of a crane used therefor. The purpose is to provide.
[0015]
[Means for Solving the Problems]
In order to achieve the above object, the invention described in claim 1 is characterized in that a hoist is installed on a crane foundation having a seismic isolation function.
The invention according to claim 3 is characterized in that the hoist is installed on a crane installation plate in a state where the improved ground and the crane installation plate are fixed.
[0016]
The invention according to claim 7 is characterized in that an improved ground installed in a pit dug down from the ground, a seismic isolation device installed on the improved ground, and a lifting machine installed on the seismic isolation device are mounted on the upper surface. A fixed crane installation plate.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In FIG. 1, reference numeral 1 denotes a crane for loading and unloading large equipment, which is fixed on a crane installation plate 2 of a crane foundation 20 and fixed, and which lifts the large equipment 3 from the ground 4 or a truck of a transport trailer (not shown) to generate nuclear power. Carry in or out of a carry-in / out place such as the building 5.
[0018]
A crane foundation 20 to which the crane 1 is fixed has a seismic isolation function, and a seismic isolation device such as a laminated rubber 8 is provided on an improved ground 7 having a pressure-resistant function formed in a pit 6 dug down to a predetermined depth from the ground 4. And the crane installation plate 2 is supported via this. The upper surface of the ground 4 and the upper surface of the crane installation plate 2 are almost at the same height, so that the crane 1 can be easily moved from the ground 4 to the crane installation plate 2.
[0019]
Further, the seismic isolation device is provided with a member having a vibration damping function such as a damper (not shown). A member having a vibration damping function can be provided in the laminated rubber 8. The laminated rubber 8 is formed by laminating a plurality of rubber plates via a metal plate, and suppresses transmission of mainly horizontal vibration such as an earthquake transmitted on the ground 4 by moving the metal plate in the horizontal direction. Has functions.
Further, the damper has a function of attenuating vibration energy caused by an earthquake or the like transmitted on the ground 4.
[0020]
A gap G of an appropriate size is formed between the crane installation plate 2 and the inner surface 7a of the improved ground 7 surrounding the crane installation plate 2.
Reference numeral 10 denotes a horizontal fixing device which is attached to the gap G between the crane installation plate 2 and the inner wall surface 7a of the improved ground 7 when stopping the seismic isolation function of the crane foundation 20, and fixes the crane installation plate 2 to prevent its movement. It is usually removed.
[0021]
A plurality of the horizontal fixing devices 10 are mounted at equal intervals around the crane installation plate 2, and the required number of crane installation plates 2 are mounted at required positions at least so as to prevent their movement in any direction. .
Reference numeral 11 denotes a covered steel plate which covers a gap G between the crane installation plate 2 and the improved ground 7 from above.
[0022]
Next, the configuration and operation of the horizontal fixing device 10 for the crane foundation 20 will be described in detail with reference to FIGS.
The horizontal fixing device 10 has one long nut 12 and two I bolts 13a and 13b screwed to the long nut 12 from both ends of the long nut 12, respectively. At this time, one end of the long nut is reverse-threaded with the other end.
Ring-shaped coupling portions 14a, 14b are integrally formed at the ends of the two I-bolts 13a, 13b that are not screwed to the long nut 12.
[0023]
Reference numeral 15 denotes a bifurcated anchor with a through hole (not shown) fixed to the side surface of the crane installation plate 2. Reference numeral 16 denotes a position opposite to the anchor 15 provided on the inner surface 7 a of the improved ground 7 on the crane installation plate 2 side. It is a fixed bifurcated anchor, also with through holes.
[0024]
Next, the method for carrying in and out the equipment of the present invention and the operation of the crane foundation 20 will be described. As shown in FIG. 2 (b), one I-bolt 13b screwed to the long nut 12 is provided with a bolt 17b in a through hole of an anchor 16 fixed to the inner surface 7a of the normally improved ground 7 and a coupling portion 14b. , And fastened by a nut 18b to be connected to the anchor 16 and hang down along the inner side surface 7a of the improved ground 7.
In this state, since the crane installation plate 2 and the improved ground 7 are not mechanically connected, the movement of the crane installation plate 2 is free without being restricted by the improved ground 7.
[0025]
In this state, the large equipment 3 is loaded or unloaded into the nuclear power plant building 5 using the crane 1 installed on the crane installation plate 2. When vibration energy acting suddenly from the outside such as an earthquake or a wind load is applied to the crane 1 while the loading / unloading operation is being performed, the crane foundation 2 fixing the crane 1 includes a laminated rubber 8 and Since it is supported on the improved ground 7 via the damper 9, it can exhibit a seismic isolation function, absorb the vibration energy, and prevent the crane 1 from falling down.
[0026]
In addition, compared with the case where the seismic isolation device is attached to the crane support, etc., the laminated rubber 8 can be installed over a wide area below the crane installation plate 2, so that the load applied to each laminated rubber 8 can be reduced, and the laminated rubber can be reduced. By increasing the number of installations of 8, the configuration corresponding to a large load becomes possible.
[0027]
In addition, mobile cranes must move on their own, so if the crane itself is equipped with seismic isolation devices, the vibrations during self-propulsion may damage the seismic isolation devices or cause the crane to fall over due to unnecessary vibration. There is also the possibility of doing. When a device or the like is carried in by a crane, it is necessary to sufficiently fix the device or the like to the crane installation plate 2 in order to prevent the device from falling down. Therefore, the seismic isolation device becomes complicated, or it is difficult to install a seismic isolation device having a sufficient seismic isolation function.
[0028]
In the crane foundation according to the present embodiment, even with such a mobile crane, it is possible to prevent collapse due to an earthquake or the like after being fixed at the loading / unloading place without affecting the self-propelled function and the like. .
[0029]
Note that the horizontal fixing device 10 hangs down by its own weight, so that the horizontal fixing device 10 is almost hung without a special structure for holding the horizontal fixing device 10 in this state. Therefore, the seismic isolation function of the crane foundation 20 is not impaired by fixing the crane installation plate 2 or the like.
[0030]
Next, a case where the seismic isolation function of the crane foundation 2 needs to be stopped will be described. When the crane 1 for carrying in / out a large-sized device is mobile, the crane 1 runs by itself near the crane foundation 20. Thereafter, the crane 1 rides on the crane installation plate 2 and moves to a predetermined position. At this time, the crane foundation 20 is performing the seismic isolation function, that is, the crane installation plate 2 and the improved ground 7 are mechanically connected. In the uncoupled state, the crane installation plate 2 moves by its own weight or shakes greatly due to the vibration during the movement of the crane 1, generating unnecessary large vibrations on the crane installation plate 2. Is expected.
[0031]
If excessive vibration occurs on the crane installation plate 2 when it is not necessary, the laminated rubber 8 and the damper that support the seismic isolation function of the crane foundation 20 may be unexpectedly damaged or may be damaged in some cases. .
[0032]
On the other hand, if the crane installation plate 2 shakes greatly when the crane 1 rides on the crane installation plate 2, the movement of the large crane 1 itself is not performed smoothly, and it takes time and effort to work. Is very dangerous because the crane 1 falls down.
[0033]
In order to prevent this, it is necessary to mechanically connect the crane installation plate 2 and the improved ground 7 using the horizontal fixing device 10 in advance to suppress the movement of the crane installation plate 2.
[0034]
For this purpose, first, the cover steel plate 11 is removed to open the gap G between the crane installation plate 2 and the improved ground 7. In this state, the long nut 12 and the I-bolts 13a, 13b are horizontally lifted around the bolt 17b from the hanging state shown in FIG. As shown in FIG. 3, the connecting portion 14a of the I bolt 13a and the anchor 15 fixed to the crane setting plate 2 are connected by bolts 17a and nuts 18a, and the crane setting plate 2 and the improved ground 7 are mechanically fixed by the horizontal fixing device 10. Connect and secure.
[0035]
At this time, since the horizontal fixing device 10 can adjust the distance between the coupling portions 14a and 14b by turning the long nut 12, the length adjustment at the time of connecting and disconnecting the crane installation plate 2 and the improved ground 7 can be performed. Can be easily performed.
[0036]
Further, after the crane installation plate 2 and the improved ground 7 are connected to each other, the long nut 12 is further turned in a direction in which the distance between the crane installation plate 2 and the improved ground 7 is reduced, so that tension is generated. And the improved ground 7 can be mechanically connected and fixed, and the movement of the crane installation plate 2 can be suppressed.
[0037]
After the movement of the crane 1 is completed on the crane installation plate 2 and the installation of the crane 1 is completed, the horizontal fixing device 10 is removed again as shown in FIG. The gap G is covered with the covered steel plate 11 to recover. By removing the horizontal fixing device 10 and disengaging the mechanical connection between the crane installation plate 2 and the improved ground 7, the movement of the crane installation plate 2 becomes free without being restrained by the improved ground 7, and the vibration energy due to an earthquake or the like is reduced. Thus, the seismic isolation function can be fully exhibited.
[0038]
When the loading and unloading of large equipment using the crane 1 on the crane foundation 20 is completed and the crane 1 is moved to the dismantling place again, the crane installation plate 2 is improved by the horizontal fixing device 10 as described above. The ground 7 is mechanically connected and fixed, and the seismic isolation function of the crane foundation 20 is stopped. In this way, it is possible to prevent the crane installation plate 2 from moving due to its own weight or being largely shaken by the vibration during the movement of the crane 1 and generating unnecessary vibrations on the crane installation plate 2. Can be. At the same time, the movement of the crane 1 itself is performed smoothly, and the working time can be reduced.
[0039]
Also, during construction of the crane installation plate 2, a formwork on the outer periphery of the crane installation plate 2 is installed on the laminated rubber 8, and the formwork is fixed to the improved ground 7 by the horizontal fixing device 10 and then placed in the formwork. By placing concrete, the construction work of the crane foundation 20 can also be facilitated, for example, by preventing the formwork from vibrating at the time of placing the concrete and making the work difficult or requiring a long working time. .
[0040]
Furthermore, when a fixed crane is used and the disassembly of the crane is performed on the crane foundation 20, first, the crane installation plate 2 and the improved ground 7 are mechanically connected by the horizontal fixing device 10. After fixing, the seismic isolation function of the crane foundation 20 is stopped, and a crane (not shown) for disassembly and disassembly is installed on the crane installation plate 2. Thereafter, the dismounting of the loading / unloading crane 1 is performed. Thereby, even if an earthquake occurs during the disassembly and disassembly of the crane, the crane for disassembly and disassembly and the crane 1 for loading and unloading can be prevented from collapsing due to the earthquake.
[0041]
4A and 4B are views showing another embodiment of the horizontal fixing device according to the present invention. In the figure, reference numeral 21 denotes a temporary pier serving also as a horizontal fixing device which extends over a gap G between the crane installation plate 2 and the improved ground 7.
The temporary pier 21 is formed of a plate-like material such as a steel plate having a strength capable of withstanding the weight of the crane 1.
[0042]
Fixing pins 22 and 23 are formed on the crane installation plate 2 and the improved ground 7 so as to face each other and to face upward. Opposite to the fixing pins 22 and 23, a hole 24 is formed in the temporary pier 21 to engage with the fixing pins 22 and 23.
[0043]
Therefore, by moving the temporary pier 21 from above so as to cover the gap G and arranging the fixing pins 22 and 23 in the holes 24, the crane installation plate 2 and the improved ground 7 are interposed through the temporary pier 21. And is mechanically fixed.
The temporary pier 21 functions as a pier when the crane 1 rides on the crane installation plate 2 and prevents the crane installation plate 2 from generating vibration.
[0044]
In the figure, the temporary pier 21 is provided on one side of the crane installation plate 2, but may be provided at a plurality of locations as needed.
Further, a fixing pin may be formed on the temporary pier 21 side, and a hole to be fitted therewith may be formed on the crane installation plate 2 and the improved ground 7 side.
[0045]
In the description of the embodiment shown in FIGS. 2 and 3, in the normal case where the seismic isolation function of the crane foundation 20 is exerted, the horizontal fixing device 10 is improved by using the connecting portion 14b of one I-bolt 13b as a fulcrum. The horizontal fixing device 10 is held in a hanging state along the inner wall surface 7a of the ground 7, but is not limited to this, and the connecting portion 14a of the I-bolt 13a on the opposite side is used as a fulcrum to support the crane installation plate 2. The horizontal fixing device 10 may be held in a hanging state along the side surface.
Further, the horizontal fixing device 10 can be completely separated from both, and can be stored in another place.
[0046]
Further, in the description of the embodiment of the present invention, a method for loading and unloading large equipment having a considerable weight such as a pressure vessel such as a nuclear power plant or a turbine generator has been described as an example. However, the present invention is not limited to this, and can be implemented as a method for loading and unloading general equipment. Also, seismic isolation devices other than laminated rubber can be used.
[0047]
【The invention's effect】
As described above, according to the method of installing a hoist according to the present invention, particularly when carrying in / out large-sized equipment, a crane for carrying in / out is installed on a crane foundation having a seismic isolation function, and the equipment is carried out by this crane. The crane can be prevented from collapsing due to vibrations acting from the outside such as an earthquake, thereby improving safety.
[0048]
Further, according to the crane foundation according to the present invention, vibration energy acting from the outside such as an earthquake is absorbed by a member having a vibration damping function to prevent the crane from collapsing. By fixing the crane, the crane can get on the crane installation plate and move to the dismantling place smoothly, and the working time can be reduced.
[Brief description of the drawings]
FIG. 1 is a vertical sectional view for explaining a method for carrying in and out equipment and a crane foundation according to an embodiment of the present invention.
FIG. 2 is an enlarged vertical sectional view of a horizontal fixing device in a crane foundation according to an embodiment of the present invention, where (a) shows a case where a crane installation plate is fixed, and (b) shows a seismic isolation function. Is the case.
FIG. 3 is an enlarged plan view of a horizontal fixing device fixing a crane installation plate in the crane foundation according to the embodiment of the present invention.
4A and 4B are diagrams showing another embodiment of the horizontal fixing device in the crane foundation according to the embodiment of the present invention, wherein FIG. 4A is a horizontal sectional view, and FIG. FIG. 4 is a vertical cross-sectional view taken along the arrow direction.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... crane, 2 ... crane installation board, 3 ... large equipment, 4 ... ground, 5 ... nuclear power plant building, 6 ... pit, 7 ... improved ground, 7a ... inner surface of improved ground, 8 ... laminated rubber, 9 ... Damper, 10 horizontal fixing device, 11 covered steel plate, 12 long nut, 13a, 13b I bolt, 14a, 14b connection part, 15, 16 anchor, 20 crane foundation, 21 temporary pier, 22, 23: fixing pin, 24: hole, G: gap.

Claims (8)

A method for installing a hoist, wherein the hoist is installed on a crane foundation having a seismic isolation function. An improved ground is formed in a pit dug down from the ground, a seismic isolation device is installed on the improved ground, a crane installation plate is installed on the seismic isolation device, and the crane foundation is constructed. The method according to claim 1, wherein the crane is installed on the crane installation plate. An installation method, wherein the hoist is installed on a crane installation plate while the improved ground and the crane installation plate are fixed. 2. The method according to claim 1, wherein the hoist is a mobile crane. The method according to claim 1, wherein the hoist is a fixed crane. The crane installation method according to claim 5, wherein the crane is assembled or dismantled by an assembling and dismantling crane installed on a crane foundation. It has an improved ground installed in a pit dug down from the ground, a seismic isolation device installed on this improved ground, and a crane installation plate installed on this seismic isolation device and fixed to a lifting machine on the upper surface A crane foundation characterized in that: The crane foundation according to claim 7, further comprising a horizontal fixing device capable of fixing the crane installation plate to the improved ground.

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