JPH0616380A - Plug suspending jig - Google Patents

Abstract

PURPOSE:To improve the workability by connecting an upper part unit for pin-engaging the hook of a crane and a lower part unit for pin-suspending a plug under the presence of a one direction center-of-gravity adjusting means and the other direction center-of-gravity adjusting means and controlling each pin through the remote operation, as for a suspending jig for a well plug for a nuclear reactor. CONSTITUTION:A cylinder 27 for driving a pin 23 is operated by the operation of an operating box, and the pin 23 of an upper part unit 21 is engaged with the hook 9 of a crane. Then, a suspending jig is positioned at a suspension-up position of the lug 7 of a well plug, and a cylinder 28 for driving a pin 25 is driven by the operation of the operating box, and the pin 25 is allowed to penetrate through the lug 7, and the well plug 6 is installed. In this case, the position of the center of gravity is previously calculated for each element 6a of the well plug 6, and setting is performed so that the degree of horizontal attitude is secured. When the deflection of the center of gravity exists, adjustment is performed by the handles 54 for one direction center-of-gravity adjusting means 24 and the other direction center-of-gravity adjusting means 26.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a well cover hanging jig used for attaching and detaching a well cover for closing the upper portion of a reactor well.

[0002]

2. Description of the Related Art In a boiling water reactor, for example, as shown in FIGS. 10 and 11, a reactor well 4 is provided above a reactor building 3 which covers a reactor pressure vessel 1 and a reactor containment vessel 2. A circular opening 5 for attaching and detaching the device is formed in such a manner as to cover the above. The opening 5 is closed by a well cover 6 during normal operation, and is opened by removing the well cover 6 at the time of periodical inspection of the reactor.

The well cover 6 is in the form of a thick disc as a whole and is constructed by assembling a plurality of strip-shaped elements 6a. In addition, the joint edge portion of each element 6a is, as shown in FIG.
In the example shown in the drawing, the elements 6a are removed in order from the both ends of the drawing, and the mounting is performed in the reverse order. On the upper surface of each element 6a, lugs 7 are provided near both ends.

Conventionally, when the well cover 6 is attached or detached, as shown in FIG. 12, the hanging wire 10 is hung on the hook 9 attached to the wire 8 of the crane, and the hanging wire 1 is attached.
0 is connected to the lug 7 to suspend each element 6a, which is performed by a wiring operation.

[0005]

Normally, the well cover 6 is used.
The center of gravity position of each element 6a is calculated in advance, and the levelness can be obtained by lifting the lug 7 of each element 6a.

However, in actuality, the center of gravity of each of the elements 6a may be displaced due to the influence of the nest generated during concrete pouring. In such a case,
As shown in FIG.
Although the level is adjusted by adjusting the length of the wire, the hanging wire 10 has a large diameter and a large weight (about 150 kg / set).
It is hard to bend and workability is poor.

The present invention has been made in view of the above circumstances, and has a relatively simple structure, the center of gravity of the well cover can be easily adjusted, and the workability of lifting and hanging by a crane can be improved. The purpose is to provide a hanging jig.

[0008]

In order to achieve the above object, a well cover hanging jig according to the present invention comprises an upper unit corresponding to a hook of a crane, and a hanging unit which is detachably connected to the upper unit. A lower unit corresponding to a well cover to be raised, and a hook locking pin having a horizontal axis is attached to the upper unit so as to be able to move forward and backward in the axial direction, and the hooking position of the hook is set in the axial direction of the pin. While the unidirectional center-of-gravity adjusting means for position adjustment is provided in the lower unit, a plurality of well cover hoisting pins with horizontal axes inserted into lugs provided at a plurality of well cover locations and hoisting the lugs are provided in the lower unit. The other is mounted so as to be movable back and forth in the axial direction, and the relative position of the upper unit and the lower unit is relatively adjusted in the direction orthogonal to the one-way center-of-gravity adjusting means on a horizontal plane. The center-of-gravity adjusting means is provided, further wherein a cylinder mechanism for advancing and retreating driving each pin provided with the respective units, characterized in that a remote operation unit for remotely operating the respective cylinder mechanism.

Each center-of-gravity adjusting means is preferably a ball screw mechanism having a manual handle.

Further, each unit is assumed to have an indicator for indicating the advance / retreat position of each pin by the cylinder mechanism.

Further, the lower unit has a guide for positioning the well cover lug and the pin near the well cover lifting pin.

[0012]

According to the present invention, the one-way center of gravity adjusting means for adjusting the hooking position of the hook in the axial direction of the hook hooking pin and the other-direction center of gravity adjustment for adjusting the connecting position of the upper unit and the lower unit. Since the position of the center of gravity can be freely adjusted in two directions on the horizontal plane by the means, the position of the center of gravity is adjusted in advance for each element of the well cover, and the position is recorded by the reproducible recording means.
When the well cover is replaced after the operation is started, adjustments can be made exactly as recorded, and the product can be easily and reliably lifted horizontally while maintaining a stable center of gravity, thus greatly improving workability.

In this case, if each of the center-of-gravity adjusting means is a ball screw mechanism having a manual handle, the construction is simple and the operation is extremely easy.

Further, according to the present invention, since each pin is driven to move back and forth by remote control, the jig can be disengaged from the hook of the crane and the jig can be disengaged from the lug of the well cover. It becomes possible to effectively improve safety.

In this case, if each unit has an indicator for indicating the advance / retreat position of each pin by the cylinder mechanism, erroneous operation such as slinging can be prevented and the safety is further improved.

Further, in the jig of the present invention, since the upper unit and the lower unit are detachably connected, for example, among the elements of the well cover, the one on the central side and the one on the end side are short. If the dimension between the lugs differs from that of the one, it can be easily dealt with by associating a plurality of types of lower elements corresponding to them with the upper element as necessary.

When the lower unit is constructed to have a guide for positioning the lug and the pin of the well cover in the vicinity of the well cover lifting pin, the jig positioning operation for lifting the well cover is ensured.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. Since the structure of the well cover to be suspended is the same as that shown in FIGS. 10 and 11, these drawings are also referred to as they are.

FIG. 1 shows the overall construction of the well cover hanging jig of this embodiment.

Basically, this hanging jig is, as shown in FIG.
It comprises an upper unit 21 corresponding to the hook 9 of the crane, and a lower unit 22 corresponding to the well cover 6 to be lifted and detachably connected to the lower portion of the upper unit 21. A hook locking pin 23 having a horizontal axis is attached to the upper unit 21 so as to be capable of advancing and retracting in the axial direction, and a one-way center of gravity adjusting means 24 for adjusting a hooking position of the hook 9 in the axial direction of the pin 23. Is provided. Further, in the lower unit 22, a plurality of well cover hoisting pins 25, each having a horizontal axis, are inserted into the lugs 7 provided at a plurality of positions of each element 6a of the well cover 6 and hoisted. Installed as possible. Then, the other-direction center-of-gravity adjusting means 26 for relatively adjusting the position of the upper unit 21 and the lower unit 22 relative to the one-way center-of-gravity adjusting means 24 in the direction orthogonal to the horizontal plane is provided. Pins 23 and 25
Cylinder mechanisms 27 and 28 for driving the cylinder back and forth are provided, respectively, and remote operation means (to be described later with reference to FIG. 8) for remotely operating the cylinder mechanisms 27 and 28 are provided.

2 to 4 show the upper unit 21 in detail.

An outer shell of the upper unit 21 is formed by a box 29 having an upper opening for introducing the hook 9 of the crane, and a hopper-shaped hook guide 30 is provided at the upper opening of the box 29. Side wall 2 of box 29
A pair of left and right pin support holes 31 are formed in the 9a and 29b so as to face each other, and the pair of left and right hook locking pins 2 that are removably inserted into the through holes 31 are provided.
The box 9 is hung by hooking the hook 9 to the box 3.

The cylinder mechanism 27 for driving the pin 23 includes a bracket 32 protruding from the outer surface of the side wall 29a of the box 29.
And the slide block 27a is supported by the connector 33.
Is connected to one end of the pin 33 through. Then, by the movement of the slide block 27a, the pin 33 is inserted into and removed from the through hole 31 of the side walls 29a and 29b, so that the hook 9 can be engaged and disengaged. The slide block 27a is provided with a mechanical indicator 34 that moves integrally with the slide block 27a.
By instructing “insert” and “pull out” displayed on the display board 35 on the surface portion of the bracket 32,
Whether the pin 33 is in the hook engagement position (insertion position) or the hook non-engagement position (pull-out position) can be visually determined.

The axial dimension of the pin 33 in the box 29 is set larger than the thickness of the hook 9 in the same direction, and the hook 9 is movable in the axial direction of the pin 33 within the dimension range. . The one-way center of gravity adjusting means 24
Is for adjusting the center of gravity of the short side of the well cover 6 by moving the hook 9 in the axial direction of the pin 33. As shown in FIG. 4, a receiving member 36 for receiving the lower end of the hook 9 from both sides in the thickness direction, Manual handle 3 for adjusting the position of the receiving tool 36
7 and a ball screw mechanism 38 having a structure 7.

The ball screw mechanism 38 connects the ball screw 39 connected to the handle 37 to the side wall 29a of the box 29,
Nuts 42 provided on the lower end bracket 41 of the receiving tool 36 while being supported by the bearings 40a and 40b on the 29b.
Is configured to be screwed onto the ball screw 39. It should be noted that the hook guide portion 3 that spreads upward is provided on the upper end portion of the receiving member 36.
6a is formed, and the receiving tool 36 is a ball screw 39.
It is slidably supported from below by a support rod 43 that is parallel to the.

Then, by rotating the ball screw 39 forward and backward by rotating the handle 37, the nut 4 is rotated.
2 through the receiving member 36 in the axial direction of the pin 23 (arrow a in FIG. 4).
In the same direction, the hook 9 is moved in the same direction, and the hanging position with respect to the pin 23 is changed, so that the gravity center can be adjusted in one direction (direction a). In addition, the upper end portion 36 of the receiving tool 36 is bent upward to facilitate receiving the hook.

5 to 7 show the lower unit 22 in detail.

The lower unit 22, as shown in FIG.
The long beam 44 substantially corresponding to each element of the well cover 6 to be lifted is mainly configured. As shown in FIGS. 6 and 7, the well cover hoisting pin 25 and the cylinder mechanism 28 for driving the well cover hoisting and moving back and forth, as shown in FIGS.
4 are provided at both ends in the longitudinal direction. That is, a pair of hanging pieces 45 facing each other in the front-rear direction (direction of arrow a in FIGS. 6 and 7) are provided at front and rear positions on the lower surface of both ends of the long beam 44 in the longitudinal direction. The pins 25 are removably inserted into the provided support holes 46, the lugs 7 on the upper surface of each element 6a of the well cover 6 are hooked, and the element 6a is lifted.

The cylinder mechanism 28 for driving the pin 25 is supported by a hanging piece 45, and its slide block 28 a is connected to one end of the pin 25 via a connecting tool 47. The movement of the slide block 28a causes the pin 25 to move.
The lug 7 can be engaged with and disengaged from the support hole 46 of the hanging piece 45. The slide block 28a includes a mechanical indicator 48 that moves integrally with the slide block 28a.
Is provided, and whether the pin 25 is in the lug engagement position (insertion position) by instructing the "insertion" and the "pulling out" displayed on the display portion 45 of the surface portion of the long beam 44 by the mechanical indicator 48. The lug non-engagement position (withdrawal position) can be visually identified.

In the vicinity of the hanging piece 45, a pair of front and rear positioning rods 49a, 49b are provided as projecting guides downward with different lengths. When the positioning rods 49a and 49b are suspended from the hanging jig, they abut on the inner surface of the lug groove 50 of each element 6a of the well cover 6 to automatically perform the lug suspension positioning.

Further, a cushioning material 22b made of resin is provided on the lower end surfaces of the hanging piece 45 and the leg piece 22a provided at the lower end of the lower unit 22, respectively.

2 to 5, the connection structure of the upper unit 21 and the lower unit 22 and the other-direction center of gravity adjusting means 26 along the long side of the well cover 6 will be described.

The upper and lower units 21, 22 are connected by connecting a hanging connecting piece 50 hanging from the lower surface of the upper unit 21 and a standing connecting piece 51 rising from the upper surface of the lower unit 22 with a connecting pin 52. Has been done.
The connecting pieces 50 and 51 are arranged in a direction orthogonal to the axis of the one-way center-of-gravity adjusting means 24 on the horizontal plane (see b in FIGS. 2 and 5).
Direction) facing each other with a space in between. The hanging connecting piece 50 is slidable with respect to the connecting pin 52 fixed to the standing connecting piece 51 by the hook 53, whereby the two units 21 and 22 are relatively movable in the b direction. The lower end of the hanging connecting piece 50 makes rolling contact with the upper surface of the lower unit 22 via the roller 50a, so that the relative movement can be easily performed.

The other-direction center-of-gravity adjusting means 26 adjusts the center of gravity by moving the two units 21, 22 relative to each other in the direction b, and the ball screw mechanism 5 with the handle 54 is provided.
It is composed of 5. That is, the ball screw mechanism 55 attaches the ball screw 56 connected to the handle 54 to the
A nut 59 supported on the lower unit 22 via a bearing 57 and supported by a bracket 58 provided on the bottom wall 29c of the box 29 of the upper unit 21 is screwed onto the ball screw 56.

Then, by rotating the ball screw 56 in the forward and reverse directions by rotating the handle 54, the nut 5
The upper unit 21 can be moved in the axial direction (direction b) of the connecting pin 52 via 9 to adjust the gravity center in the other direction.

It should be noted that the length of the element 6a and thus the lug position greatly differ between the center side and the end side of the well cover 6. Therefore, in the present embodiment, two types of lower units 22 are prepared so that any lifting of the element 6a can be dealt with.

FIG. 8 shows the remote control means 60 for the cylinder mechanisms 27, 28 described above. This remote control means 60
After adjusting the air from the air source 61 with the pressure adjusting unit 62, the valves are switched in the operation box 63 to operate the cylinder mechanisms 27 and 28 of the hanging jig main body 62.

The pressure adjusting unit 62 includes the pneumatic scanning box 6
The pressure of the air supplied to the air conditioner 3 is set and purified. The air source 61 includes an air hose 65 and a coupler joint 66.
Connected through. This unit 62 is configured by incorporating an air filter 67, a regulator 68 and a pressure gauge 69, and is connected to the pneumatic operation box 63 side via an air hose 70 by a coupler joint 71.

The pneumatic operation box 62 controls the on / off of the air supplied to the hanging jig main body 63 and the control of the flow direction separately for the two systems of the crane side and the well cover side. The keyed manual switching valves 74 to 77 and the pneumatic differential valves 78 and 79 are incorporated. And
A coupler joint 81 is connected to the hanging jig main body 64 side via an air hose 80.

The hanging jig main body 64 is divided into a piping system for the cylinder mechanism 27 on the crane side and a piping system for the cylinder mechanism 28 on the well cover side, and pilot check valves 82 to 85 and speed controllers 86 to 9 are respectively provided.
7. The pressure gauges 98 to 101 are incorporated.
The pilot check valves 82 to 85 are driven by extracting the atmospheric pressures of the mating pipes on the inlet side and the outlet side, respectively, and automatically when an abnormality such as damage to the pipes on the coupler joint 81 side causes a pressure drop. Each cylinder mechanism 2
The air pressure of 7, 28 can be maintained as it is.

Next, the operation will be described.

In this embodiment, first, the manual switching valves 74 and 75 of the crane side system are operated in the operation box 63 to set the pin 2
By controlling the air pressure supply direction to the cylinder mechanism 27 for driving three, the hook 9 of the crane is connected to the pin 23 of the upper unit 21.
Hang on.

Next, the lifting jig is moved to a position above the well cover 6 and then lowered to position the lug 7 of the predetermined unit 6a at the lifting position. In this case, first pin 25
Is set in the pulled-out state, and after positioning, the manual switching valves 76 and 77 of the well cover side system are operated in the operation box 63 to control the air pressure supply direction to the cylinder mechanism 28 for driving the pin 25, and the pin 25 to the lug 7. Through this, the unit 6a is lifted as shown in FIG. In the case of hanging, the operation reverse to the above may be performed.

In this case, the position of the center of gravity of each element 6a of the well cover 6 is calculated in advance, and the horizontal level can be obtained by lifting the lug 7 of each element 6a. The center of gravity may shift due to the effect of the nest. Therefore, in the present embodiment, the center of gravity of the hanging jig corresponding to each element 6a of the well cover 6 is adjusted and the position thereof is recorded in advance. That is, the displacement amount of the center of gravity of the element 6a is measured in advance, and the movement of the center of gravity of the hanging jig required to eliminate the displacement of the center of gravity is performed by the handle 37 of each of the center-of-gravity adjusting means 24 and 26 under the unloaded state of the hanging jig. This is done by the operation of 54. In this case, since the handle 37 on the upper unit 21 side is for moving the well cover in the short side direction and the handle 54 on the lower unit 22 side is for moving in the long side direction, the center of gravity adjustment amount of the well cover is adjusted in each direction. Keep a record. The moving stroke for adjusting the center of gravity in this embodiment is ± 50 mm in the long side direction of the well cover and ± 40 mm in the short side direction, and the well cover 6 having a diameter of 12200 mm can be sufficiently dealt with.

Therefore, according to the present embodiment, the center-of-gravity adjustment position is recorded by the reproducible recording means, so that the well-centered position can be adjusted by performing the adjustment as recorded when the well cover 6 is replaced after the start of operation. It can be easily and surely hung up horizontally and the workability can be greatly improved.

In this case, the center-of-gravity adjusting means 24 and 26 are
Ball screw mechanism 3 having manual handles 37, 54
Since the number is 8, 55, the structure is simple and the operation is extremely easy.

Further, according to this embodiment, the pins 23 and 25 are driven forward and backward by remote control, whereby the hanging jig is engaged with and disengaged from the hook 9 of the crane, and the hanging jig is fixed to the lug 7 of the well cover 6. Since it can be engaged and disengaged unattended, it is possible to effectively reduce labor and improve safety.
In this case, the upper and lower units 21 and 22 are the cylinder mechanisms 2
Since the mechanical indicators 34 and 48 for instructing the advance / retreat position of each pin by 7 and 28 are provided, erroneous operations such as lifting can be prevented, and the safety can be further improved.

Further, in the hanging jig of the present embodiment, since the upper unit 21 and the lower unit 22 are detachably connected, for example, one of the elements 6a of the well cover 6 having a long central portion side. If the dimension between the lugs 7 is different between the one on the end side and the one on the end side, it is possible to easily cope with it by assembling a plurality of types of lower elements 22 corresponding thereto to the upper element 21 as necessary.

Further, the lug 7 of the well cover 6 is provided near the well cover lifting pin 25 of the lower unit 22.
Since the positioning rods 49a and 49b for the pin 25 are provided, the positioning operation of the lifting jig with respect to the well cover 6 at the time of lifting is ensured.

[0050]

As described above, according to the well cover hanging jig of the present invention, the center of gravity adjusting means can be used to adjust the height of the surface on the horizontal plane.
Since the position of the center of gravity can be adjusted freely in any direction, the well cover can be easily and reliably lifted horizontally in a stable state, which greatly improves workability and allows the hook to be detached from the hook of the crane by remote control. Since the hanging jig can be detached from and attached to the well cover lug, labor can be reduced and safety can be effectively improved. Also, when the upper unit and the lower unit have a detachable connection structure, the lug dimensions differ. However, it is possible to easily deal with it by assembling multiple types of lower elements to the upper element as necessary, lifting and lowering the well cover can be performed easily and reliably, safely and efficiently, and radiation exposure can be reduced. The effect that it can be effectively achieved is exhibited.

When the center-of-gravity adjusting means is a ball screw mechanism having a manual handle, the structure is simple and the operation is extremely easy, and each unit has a cylinder mechanism to move the pins forward and backward. By providing an indicator for indicating that it is possible to prevent erroneous operations such as lifting, and when the lower unit is configured to have a positioning guide for the well cover lug and pin near the well cover lifting pins. Has an effect such that a hanging jig positioning operation at the time of hoisting the well cover becomes reliable.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram showing an embodiment of a well cover hanging jig according to the present invention.

FIG. 2 is an enlarged view showing an upper unit of the well cover hanging jig shown in FIG.

FIG. 3 is a side view of FIG.

4 is a cross-sectional view taken along the line AA of FIG.

5 is a sectional view taken along line BB of FIG.

6 is a plan view showing a lower unit of the well cover hanging jig of FIG. 1. FIG.

7 is a cross-sectional view taken along the line CC of FIG.

FIG. 8 is an air system diagram showing a control circuit of the same embodiment.

FIG. 9 is a diagram showing a usage state of the embodiment.

FIG. 10 is a view showing a well cover portion in the upper part of a nuclear reactor.

FIG. 11 is a plan view showing the well cover portion.

FIG. 12 is a diagram showing a conventional technique.

[Explanation of symbols]

 6 Well cover 7 Lug 9 Hook 21 Upper unit 22 Lower unit 23 Hook hooking pin 24 One-way center of gravity adjusting means 25 Well cover lifting pin 26 Other direction center of gravity adjusting means 27, 28 Cylinder mechanism 34, 48 Indicator 37, 54 Handle 38,55 Ball screw mechanism 49 Positioning guide 60 Remote control means

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] November 26, 1992

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] Full text

[Correction method] Change

[Correction content]

[Document name] Statement

[Title of Invention] Plug hanging jig

[Claims]

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plug suspension jig used for attaching and detaching a well plug for closing the upper portion of a reactor well.

[0002]

2. Description of the Related Art In a boiling water reactor, for example, as shown in FIGS. 10 and 11, a reactor well 4 is provided above a reactor building 3 which covers a reactor pressure vessel 1 and a reactor containment vessel 2. A circular opening 5 for attaching and detaching the device is formed in such a manner as to cover the above. This opening 5 is closed by a well plug 6 during normal operation, and is opened by removing the well plug 6 at the time of periodical inspection of a nuclear reactor.

By the way, the well plug 6 has a thick disc shape as a whole and is constructed by assembling a plurality of strip-shaped elements 6a. In addition, the joint edge portion of each element 6a is, as shown in FIG.
In the example shown in the drawing, the elements 6a are removed in order from the both ends of the drawing, and the mounting is performed in the reverse order. On the upper surface of each element 6a, lugs 7 are provided near both ends.

Conventionally, when attaching and detaching the well plug 6, as shown in FIG. 12, a hanging wire 10 is hung on a hook 9 attached to a wire 8 of a crane, and the hanging wire 1 is attached.
0 is connected to the lug 7 to suspend each element 6a, which is performed by a wiring operation.

[0005]

Usually, the well plug 6 is used.
The position of the center of gravity is calculated in advance for each element 6a, and the degree can be adjusted by lifting the lug 7 of each element 6a.

However, in actuality, the center of gravity of each element 6a may deviate due to a construction error or the like.
In such a case, as shown in FIG. 12, although the chain block 11 or the like is used to adjust the length of the suspension wire 10 for horizontal alignment, the suspension wire 10 has a large diameter and a large diameter. It is difficult to bend due to its weight (about 150 kg / set), and workability is poor.

The present invention has been made in view of the above circumstances, and has a relatively simple structure, the center of gravity of a well plug can be easily adjusted, and the workability of lifting and hanging by a crane can be improved. The purpose is to provide a jig.

[0008]

In order to achieve the above object, a plug hoisting jig according to the present invention is an upper unit corresponding to a hook of a crane, and is detachably connected to the upper unit and hoisted. A lower unit corresponding to a power plug, and a hook locking pin having a horizontal axis is attached to the upper unit such that the hook locking pin can move forward and backward in the axial direction, and the hook locking position is located in the axial direction of the pin. While the unidirectional center-of-gravity adjusting means for adjusting is provided, in the lower unit, a plurality of plug hoisting pins, each having a horizontal shaft center, are inserted in lugs provided at a plurality of positions of the plug and hoisted in the axial direction. And a second-direction center-of-gravity adjusting means for mounting the upper unit and the lower unit relative to each other in a direction orthogonal to the one-direction center-of-gravity adjusting means on a horizontal plane. Wherein the cylinder mechanism for advancing and retreating driving each pin provided with the respective units, characterized in that a remote operation unit for remotely operating the respective cylinders mechanisms.

Each center-of-gravity adjusting means is preferably a ball screw mechanism having a manual handle.

Further, each unit is assumed to have an indicator for indicating the advance / retreat position of each pin by the cylinder mechanism.

Further, the lower unit has a guide for positioning the plug lug and the pin near the plug lifting pin.

[0012]

According to the present invention, the one-way center of gravity adjusting means for adjusting the hooking position of the hook in the axial direction of the hook hooking pin and the other-direction center of gravity adjustment for adjusting the connecting position of the upper unit and the lower unit. Since the position of the center of gravity can be freely adjusted in two directions on the horizontal plane by the means, the position of the center of gravity can be adjusted in advance for each element of the plug, and the position can be recorded by the reproducible recording means. When the plug is replaced after the start, adjustments can be made exactly as recorded and the product can be easily and reliably lifted horizontally while maintaining a stable center of gravity, thus greatly improving workability.

In this case, if each of the center-of-gravity adjusting means is a ball screw mechanism having a manual handle, the construction is simple and the operation is extremely easy.

Further, according to the present invention, since each pin is driven to move back and forth by remote operation, the jig can be engaged and disengaged with respect to the hook of the crane and the jig can be engaged with and disengaged from the lug of the plug, thereby reducing labor and safety. It is possible to effectively improve the property.

In this case, if each unit has an indicator for indicating the advance / retreat position of each pin by the cylinder mechanism, erroneous operation such as slinging can be prevented and the safety is further improved.

Further, in the jig of the present invention, since the upper unit and the lower unit have a detachable connection structure, for example, among the elements of the plug, one having a long center side and one having a short end side are used. If the dimensions between the lugs differ from each other, it is possible to easily deal with them by assembling a plurality of types of lower elements corresponding to the different lugs to the upper element as necessary.

When the lower unit has a guide for positioning the plug lug and the pin near the plug hoisting pin, the jig positioning operation for hoisting the plug becomes reliable.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. The present embodiment relates to a well jig for hanging a well plug that closes the upper part of the reactor well, and the structure of the well plug to be hung is the same as that shown in FIGS. 10 and 11. The figure is also referred to as it is.

FIG. 1 shows the overall construction of the well plug hanging jig of this embodiment.

Basically, this hanging jig is, as shown in FIG.
It is composed of an upper unit 21 corresponding to the hook 9 of the crane, and a lower unit 22 corresponding to the well plug 6 which is detachably connected to the lower portion of the upper unit 21 and is to be lifted. A hook locking pin 23 having a horizontal axis is attached to the upper unit 21 so as to be capable of advancing and retracting in the axial direction, and a one-way center of gravity adjusting means 24 for adjusting a hooking position of the hook 9 in the axial direction of the pin 23. Is provided. Further, in the lower unit 22, a plurality of well plug hoisting pins 25, each of which has a horizontal axis, is inserted into the lugs 7 provided at a plurality of positions of each element 6a of the well plug 6 and hoists the lugs 7 in the axial direction. Installed as possible. Then, the other-direction center-of-gravity adjusting means 26 for relatively adjusting the position of the upper unit 21 and the lower unit 22 relative to the one-way center-of-gravity adjusting means 24 in the direction orthogonal to the horizontal plane is provided. Pins 23 and 25
Cylinder mechanisms 27 and 28 for driving the cylinder back and forth are provided, respectively, and remote operation means (to be described later with reference to FIG. 8) for remotely operating the cylinder mechanisms 27 and 28 are provided.

2 to 4 show the upper unit 21 in detail.

An outer shell of the upper unit 21 is formed by a box 29 having an upper opening for introducing the hook 9 of the crane, and a hopper-shaped hook guide 30 is provided at the upper opening of the box 29. Side wall 2 of box 29
A pair of left and right pin support holes 31 are formed in the 9a and 29b so as to face each other, and the pair of left and right hook locking pins 2 that are removably inserted into the through holes 31 are provided.
The box 9 is hung by hooking the hook 9 to the box 3.

The cylinder mechanism 27 for driving the pin 23 includes a bracket 32 protruding from the outer surface of the side wall 29a of the box 29.
And the slide block 27a is supported by the connector 33.
Is connected to one end of the pin 33 through. Then, by the movement of the slide block 27a, the pin 33 is inserted into and removed from the through hole 31 of the side walls 29a and 29b, so that the hook 9 can be engaged and disengaged. The slide block 27a is provided with a mechanical indicator 34 that moves integrally with the slide block 27a.
By instructing “insert” and “pull out” displayed on the display board 35 on the surface portion of the bracket 32,
Whether the pin 33 is in the hook engagement position (insertion position) or the hook non-engagement position (pull-out position) can be visually determined.

The axial dimension of the pin 33 in the box 29 is set larger than the thickness of the hook 9 in the same direction, and the hook 9 is movable in the axial direction of the pin 33 within the dimension range. . The one-way center of gravity adjusting means 24
Is for adjusting the center of gravity of the short side of the well plug 6 by moving the hook 9 in the axial direction of the pin 33. As shown in FIG. 4, a receiving member 36 for receiving the lower end of the hook 9 from both sides in the thickness direction, Manual handle 3 for adjusting the position of the receiving tool 36
7 and a ball screw mechanism 38 having a structure 7.

The ball screw mechanism 38 connects the ball screw 39 connected to the handle 37 to the side wall 29a of the box 29,
Nuts 42 provided on the lower end bracket 41 of the receiving tool 36 while being supported by the bearings 40a and 40b on the 29b.
Is configured to be screwed onto the ball screw 39. It should be noted that the hook guide portion 3 that spreads upward is provided on the upper end portion of the receiving member 36.
6a is formed, and the receiving tool 36 is a ball screw 39.
It is slidably supported from below by a support rod 43 that is parallel to the.

Then, by rotating the ball screw 39 forward and backward by rotating the handle 37, the nut 4 is rotated.
2 through the receiving member 36 in the axial direction of the pin 23 (arrow a in FIG. 4).
In the same direction, the hook 9 is moved in the same direction, and the hanging position with respect to the pin 23 is changed, so that the gravity center can be adjusted in one direction (direction a). In addition, the upper end portion 36 of the receiving tool 36 is bent upward to facilitate receiving the hook.

5 to 7 show the lower unit 22 in detail.

The lower unit 22, as shown in FIG.
A long beam 44 substantially corresponding to each element of the well plug 6 to be lifted is mainly configured. As shown in FIGS. 6 and 7, the well plug hoisting pin 25 and the cylinder mechanism 28 for driving the well plug hoisting back and forth, as shown in FIGS.
4 are provided at both ends in the longitudinal direction. That is, a pair of hanging pieces 45 facing each other in the front-rear direction (direction of arrow a in FIGS. 6 and 7) are provided at front and rear positions on the lower surface of both ends of the long beam 44 in the longitudinal direction. The pins 25 are removably inserted into the provided support holes 46, the lugs 7 on the upper surfaces of the elements 6a of the well plug 6 are hooked, and the elements 6a are lifted.

The cylinder mechanism 28 for driving the pin 25 is supported by a hanging piece 45, and its slide block 28 a is connected to one end of the pin 25 via a connecting tool 47. The movement of the slide block 28a causes the pin 25 to move.
The lug 7 can be engaged with and disengaged from the support hole 46 of the hanging piece 45. The slide block 28a includes a mechanical indicator 48 that moves integrally with the slide block 28a.
Is provided, and whether the pin 25 is in the lug engagement position (insertion position) by instructing the "insertion" and the "pulling out" displayed on the display portion 45 of the surface portion of the long beam 44 by the mechanical indicator 48. The lug non-engagement position (withdrawal position) can be visually identified.

In the vicinity of the hanging piece 45, a pair of front and rear positioning rods 49a, 49b are provided as projecting guides downward with different lengths. When the positioning rods 49a and 49b are suspended from the hanging jig, they are brought into contact with the inner surface of the lug groove 50 of each element 6a of the well plug 6 to automatically perform the lug suspension positioning.

Further, a cushioning material 22b made of resin is provided on the lower end surfaces of the hanging piece 45 and the leg piece 22a provided at the lower end of the lower unit 22, respectively.

2 to 5, the connection structure of the upper unit 21 and the lower unit 22 and the other-direction center-of-gravity adjusting means 26 along the long side of the well plug 6 will be described.

The upper and lower units 21, 22 are connected by connecting a hanging connecting piece 50 hanging from the lower surface of the upper unit 21 and a standing connecting piece 51 rising from the upper surface of the lower unit 22 with a connecting pin 52. Has been done.
The connecting pieces 50 and 51 are arranged in a direction orthogonal to the axis of the one-way center-of-gravity adjusting means 24 on the horizontal plane (see b in FIGS. 2 and 5).
Direction) facing each other with a space in between. The hanging connecting piece 50 is slidable with respect to the connecting pin 52 fixed to the standing connecting piece 51 by the hook 53, whereby the two units 21 and 22 are relatively movable in the b direction. The lower end of the hanging connecting piece 50 makes rolling contact with the upper surface of the lower unit 22 via the roller 50a, so that the relative movement can be easily performed.

The other-direction center-of-gravity adjusting means 26 adjusts the center of gravity by moving the two units 21, 22 relative to each other in the direction b, and the ball screw mechanism 5 with the handle 54 is provided.
It is composed of 5. That is, the ball screw mechanism 55 attaches the ball screw 56 connected to the handle 54 to the
A nut 59 supported on the lower unit 22 via a bearing 57 and supported by a bracket 58 provided on the bottom wall 29c of the box 29 of the upper unit 21 is screwed onto the ball screw 56.

Then, by rotating the ball screw 56 in the forward and reverse directions by rotating the handle 54, the nut 5
The upper unit 21 can be moved in the axial direction (direction b) of the connecting pin 52 via 9 to adjust the gravity center in the other direction.

It should be noted that the length of the element 6a and thus the lug position greatly differ between the center side and the end side of the well plug 6. Therefore, in the present embodiment, two types of lower units 22 are prepared so that any lifting of the element 6a can be dealt with.

FIG. 8 shows the remote control means 60 for the cylinder mechanisms 27, 28 described above. This remote control means 60
In this system, the air from the air source 61 is adjusted by the pressure adjusting unit 62, and then the valves are switched in the operation box 63 to operate the cylinder mechanisms 27 and 28 of the hanging jig main body 62.

The pressure adjusting unit 62 includes the pneumatic scanning box 6
The pressure of the air supplied to the air conditioner 3 is set and purified. The air source 61 includes an air hose 65 and a coupler joint 66.
Connected through. This unit 62 is configured by incorporating an air filter 67, a regulator 68 and a pressure gauge 69, and is connected to the pneumatic operation box 63 side via an air hose 70 by a coupler joint 71.

The pneumatic operation box 62 controls the on / off of the air supplied to the hanging jig main body 63 and the control of the flow direction thereof separately for the two systems of the crane side and the well plug side. The keyed manual switching valves 74 to 77 and the pneumatic differential valves 78 and 79 are incorporated. And
A coupler joint 81 is connected to the hanging jig main body 64 side via an air hose 80.

The suspension jig main body 64 is divided into a piping system for the cylinder mechanism 27 on the crane side and a piping system for the cylinder mechanism 28 on the well plug side, and pilot check valves 82-85 and speed controllers 86-9 are respectively provided.
7. The pressure gauges 98 to 101 are incorporated.
The pilot check valves 82 to 85 are driven by extracting the atmospheric pressures of the mating pipes on the inlet side and the outlet side, respectively, and automatically when an abnormality such as damage to the pipes on the coupler joint 81 side causes a pressure drop. Each cylinder mechanism 2
The air pressure of 7, 28 can be maintained as it is.

Next, the operation will be described.

In this embodiment, first, the manual switching valves 74 and 75 of the crane side system are operated in the operation box 63 to set the pin 2
By controlling the air pressure supply direction to the cylinder mechanism 27 for driving three, the hook 9 of the crane is connected to the pin 23 of the upper unit 21.
Hang on.

Next, the lifting jig is moved to a position above the well plug 6 and then lowered to position the lug 7 of the predetermined unit 6a at the lifting position. In this case, first pin 25
Is set in the pulled-out state, and after positioning, the manual switching valves 76 and 77 of the well plug side system are operated in the operation box 63 to control the air pressure supply direction to the cylinder mechanism 28 for driving the pin 25, and the pin 25 to the lug 7. Through this, the unit 6a is lifted as shown in FIG. In the case of hanging, the operation reverse to the above may be performed.

In this case, the position of the center of gravity of each element 6a of the well plug 6 is calculated in advance, and the horizontal level can be obtained by hoisting the lug 7 of each element 6a. It may shift. Therefore, in this embodiment, the center of gravity of the suspension jig corresponding to each element 6a of the well plug 6 is adjusted and the position thereof is recorded in advance. That is, the displacement of the center of gravity of the element 6a is measured in advance, and the movement of the center of gravity of the hanging jig required to eliminate the displacement of the center of gravity is performed by the handles 37, 26 of the respective center of gravity adjusting means 24, 26 under no load of the hanging jig.
This is done by the operation of 54. In this case, the handle 37 on the upper unit 21 side is for moving the well plug in the short side direction, and the handle 54 on the lower unit 22 side is for moving in the long side direction. Keep a record. The moving stroke for adjusting the center of gravity of the present embodiment is ± 50 mm in the long side direction of the well plug and ± 40 mm in the short side direction, and the well plug 6 having a diameter of 12200 mm can be sufficiently dealt with.

Therefore, according to the present embodiment, the center-of-gravity adjustment position is recorded by the reproducible recording means, so that when the well plug 6 is replaced after the start of the operation, the adjustment is performed as recorded so that the center-of-gravity is stable. It can be easily and surely hung up horizontally and the workability can be greatly improved.

In this case, the center-of-gravity adjusting means 24 and 26 are
Ball screw mechanism 3 having manual handles 37, 54
Since the number is 8, 55, the structure is simple and the operation is extremely easy.

Further, according to this embodiment, the pins 23 and 25 are driven to move back and forth by remote control, whereby the hanging jig is engaged with and disengaged from the hook 9 of the crane, and the hanging jig with respect to the lug 7 of the well plug 6. Since it can be engaged and disengaged unattended, it is possible to effectively reduce labor and improve safety.
In this case, the upper and lower units 21 and 22 are the cylinder mechanisms 2
Since the mechanical indicators 34 and 48 for instructing the advance / retreat position of each pin by 7 and 28 are provided, erroneous operations such as lifting can be prevented, and the safety can be further improved.

Further, in the hanging jig of this embodiment, since the upper unit 21 and the lower unit 22 are detachably connected, for example, one of the elements 6a of the well plug 6 having a long central portion side. If the dimension between the lugs 7 is different between the one on the end side and the one on the end side, it is possible to easily cope with it by assembling a plurality of types of lower elements 22 corresponding thereto to the upper element 21 as necessary.

Further, the lug 7 of the well plug 6 is provided near the well plug lifting pin 25 of the lower unit 22.
Since the positioning rods 49a and 49b for the pin 25 are provided, the positioning operation of the hoisting jig with respect to the well plug 6 at the time of hoisting is ensured.

The handles 37 and 54 operated for adjusting the center of gravity can be automated by connecting to a motor or the like.

[0051]

As described above, according to the plug hanging jig of the present invention, the position of the center of gravity can be freely adjusted in two directions on the horizontal plane by the center of gravity adjusting means, so that the plug can be hung horizontally in a stable state. Can be done easily and surely, and the workability can be greatly improved. Also, the lifting jig can be detached from the hook of the crane and the jig can be detached from the lug of the plug by remote control, thus reducing labor and improving safety. Even if the dimensions between the lugs differ due to the connection structure that allows the upper unit and the lower unit to be attached and detached, it is possible to easily deal with them by assembling multiple types of lower elements to the upper element as needed. You can
The plug can be lifted and hung easily, reliably, safely and efficiently, and radiation exposure can be effectively reduced.

When the center-of-gravity adjusting means is a ball screw mechanism having a manual handle, the structure is simple and the operation is extremely easy, and each unit has a cylinder mechanism to move the pins forward and backward. By having an indicator that indicates, it is possible to prevent erroneous operations such as lifting, and when the lower unit is configured to have a positioning guide for the plug lug and pin near the plug lifting pin, The effect that the operation of positioning the hanging jig at the time of hoisting the plug is ensured is achieved.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram showing an embodiment of a plug hanging jig according to the present invention.

2 is an enlarged view showing an upper unit of the plug hanging jig of FIG. 1. FIG.

FIG. 3 is a side view of FIG.

4 is a cross-sectional view taken along the line AA of FIG.

5 is a sectional view taken along line BB of FIG.

6 is a plan view showing a lower unit of the plug hanging jig of FIG. 1. FIG.

7 is a cross-sectional view taken along the line CC of FIG.

FIG. 8 is an air system diagram showing a control circuit of the same embodiment.

FIG. 9 is a diagram showing a usage state of the embodiment.

FIG. 10 is a view showing a well plug portion in the upper part of a nuclear reactor.

FIG. 11 is a plan view showing the well plug portion.

FIG. 12 is a diagram showing a conventional technique.

[Explanation of symbols] 6 well plug 7 lug 9 hook 21 upper unit 22 lower unit 23 hook hooking pin 24 one-way center of gravity adjusting means 25 well plug lifting pin 26 other direction center of gravity adjusting means 27, 28 cylinder mechanism 34, 48 Indicator 37,54 Handle 38,55 Ball screw mechanism 49 Positioning guide 60 Remote control means

Front page continuation (72) Inventor Kazuyuki Doi, 3-15-3 Nishishimbashi, Minato-ku, Tokyo Shiba Kogyo Co., Ltd. In Engineering Center (72) Inventor Yoshifumi Watanabe 66-2 Horikawa-cho, Saiwai-ku, Kawasaki-shi, Kanagawa Toshiba Engineering Co., Ltd.

Claims (4)

[Claims] 1. An upper unit corresponding to a hook of a crane, and a lower unit detachably connected to the upper unit and corresponding to a well cover to be lifted,
On the upper unit, a hook locking pin having a horizontal axis is attached so as to be able to advance and retract in the axial direction, and one-way center of gravity adjusting means for adjusting the hooking position of the hook in the axial direction of the pin is provided, In the lower unit, a plurality of well cover hoisting pins, each of which has a horizontal axis, is inserted through lugs provided at a plurality of positions in the well cover so as to hoist it, and the well cover hoisting pins are attached to the upper unit so as to be able to advance and retreat in the axial direction. The other unit is provided with another-direction center-of-gravity adjusting unit that relatively adjusts the position of the lower unit relative to the one-direction center-of-gravity adjusting unit in a direction orthogonal to a horizontal plane, and further, each unit is provided with a cylinder mechanism that drives the pins to move forward and backward. At the same time, a well cover hanging jig is provided with remote control means for remotely controlling each cylinder mechanism. 2. The well cover hanging jig according to claim 1, wherein each of the center-of-gravity adjusting means is a ball screw mechanism having a manual handle. 3. The well cover hanging jig according to claim 1, wherein each unit has an indicator for indicating the advance / retreat position of each pin by the cylinder mechanism. 4. The well cover lifting jig according to claim 1, wherein the lower unit has a guide for positioning the well cover lug and the pin in the vicinity of the well cover lifting pin.