JPH0573867B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a jig for jacking up an existing tank.

(Prior Art) In general, when a storage tank for petroleum, etc. is found to require repair, such as modifying the foundation or replacing the bottom plate or annual plate, as a result of periodic inspection, the entire tank is lifted up with jacks and placed in a designated position. Carry out repair work.

As a jack up jig used for this jack up work, for example, the one shown in FIG. 10, and the ones shown in FIGS. 11 and 12 are known (Japanese Patent Publication No. 59-50833).

The one shown in FIG. 10 shows a so-called lug-type jig, in which a tank side plate 4 is erected on an annual plate 3 that is laid on a foundation 1 together with a bottom plate 2.
It is equipped with a jack lug 5 welded to the outer surface of.
In addition, on the inner surface of this side plate 4, a side plate reinforced steel 7 is installed.
It is fixed via a gate-shaped jig 8 and a taper pin 9 welded to the inner surface of the side plate 4.

Therefore, in this lug type jig, by pushing up the lug 5 with the jack 10, the side plate 4 is lifted.

On the other hand, what is shown in FIGS. 11 and 12 shows a so-called fork type jig, and this jig 1
1 includes a main body 12 constructed in a tower shape, a support plate 13 that is horizontally fixed to the lower end of the main body 12 and protrudes from the front and rear ends of the main body 12, and a supporting plate 13 that is provided at the upper end of the main body 12 and abuts on the outer surface of the side plate. A possible contact plate 14,
It is constructed from a receiving plate 15 which is fixed to the lower part of the main body 12 and receives the jack lifting part. In addition, our board 1
4 is rotatably supported at the upper end of the main body 12 via a triangular frame-shaped bracket 14A. Also,
The protruding lower end surface 13A of the support plate 13 is formed to be inclined.

In this fork type jig 11, the support plate 13 is pushed between the annular plate and the foundation, and the contact plate 14 is brought into contact with the outer surface of the tank side plate.
Then, set the jack and connect the lifting section to the receiving plate 15.
bring it into contact with. Next, by pushing up the support plate 13 and the main body 12 with a jack via the receiving plate 15, the side plate is lifted.

(Problems to be Solved by the Invention) However, such conventional jack up jigs have had the following problems.

That is, in the case of the former type of jig, since the free end (protruding end) of the lug is supported by a jack, the force acting on the tank side plate in the horizontal direction due to the moment when the jig is pulled up increases, resulting in large deformation of the side plate. In order to prevent this deformation, reinforcement is required, and when the lug is welded to the side plate, the shear force due to the side plate load and moment load from the jack support part act on the welded part, so the amount of welding must be increased. It didn't happen. As a result, preparation,
There was a problem in that it required a great deal of effort and time to clean up the remains.

On the other hand, in the latter method, which was created in view of the shortcomings of the former, the lower end surface of the side plate was lifted by a fork-shaped support plate, which caused damage to the foundation when inserting and removing the fork (support plate), and the fork had to be replaced when going up and down. In addition, the side plate is easily deformed when replacing the fork, and the jig is easy to come off when the annular plate is fixed to the side plate. Also, it is necessary to fix the fork to the bottom surface of the side plate. Furthermore, there were problems in that the extraction jig and the extraction and insertion operations were troublesome, and the jig up mound had to be made deep.

(Means for Solving the Problems) The present invention is an existing tank jacking jig for jacking up an existing tank, which comprises:
A main body constructed in a tower shape and placed outside the existing tank, a support plate protruding from the lower end of the main body toward the side plate of the existing tank, and a support plate connected to the protruding end of the support plate via a pin. a lug fixed to the side plate; a contact plate supported by the upper end of the main body and abutting the outer surface of the side plate of the existing tank;
It is configured to include a receiving plate fixed to the lower end of the main body and abutting against the elevating part of the jack.

(Function) In the jig for jacking up an existing tank according to the present invention, since the lug and the support plate are pin-joined, the moment load acting on the tank side plate due to jack support is significantly reduced, and the horizontal direction acting on the side plate is Force is significantly reduced. Furthermore, since the tank is jacked up via the lugs fixed to the side plates, the jacking work is extremely easy without damaging the foundation or the like. Furthermore, since it is a pin connection, the jig main body can be easily attached and detached.

(Example) Hereinafter, an example of the present invention will be described based on the drawings.

1 to 9 show an embodiment of a jig for jacking up an existing tank according to the present invention.

First, the configuration will be explained.

As shown in FIGS. 1 and 2, the jack up jig 21 has a tower-shaped main body 22 built at an appropriate height, and a pair of support plates 23 are attached to the lower end of the main body 22. is fixed so as to protrude horizontally by a predetermined length from the front surface (left end surface in FIG. 1) of the lower end of the main body 22. Note that this support plate 23
A pin hole 24 is formed at the protruding end. The lower part of the main body 22 is formed into a box shape and has a horizontal receiving plate 25.
The upper end of the lifting portion of the jack 26 is brought into contact with the center portion of the jack 5 (see FIGS. 7 and 9). 27 is the main body 22
This plate is rotatably supported at the upper end via a pin 28, and one surface of this plate 27 can come into contact with the outer surface of the tank side plate 29, as shown in FIGS. 7 and 9. It is said that Note that the one surface of the contact plate 27 may be curved to correspond to the curvature of the outer surface of the tank side plate 29. A pair of triangular frame-shaped brackets 30 are fixed to the other surface of the contact plate 27, and are supported by the pins 28 via the brackets 30. Note that one surface of the contact plate 27 protrudes forward by a predetermined length from the protruding end of the support plate 23.

As shown in FIGS. 7 and 9, a lug 31 welded to the outer surface of the lower end of the side plate 29 is attached to the protruding end of the support plate 23 by a pin 32 so that it can rotate freely within the upper and lower surfaces. installed. That is, as shown in FIGS. 3 and 4, the lug 31
has a rectangular base plate 33 whose one side is welded to the side plate 29, and a substantially trapezoidal vertical plate 34 which is fixed to the other side of the base plate 33. Vertical plate 34
There is a pin hole 35 approximately in the center of the
An auxiliary pin hole 36 is located at a predetermined distance away.
are formed respectively. A pin 32 shown in FIG. 5 is inserted into the pin hole 24 and this pin hole 35, and is inserted into the auxiliary pin hole 36 to prevent relative rotation between the lug 31 and the support plate 23 (falling down of the lug 31). An auxiliary pin 37 (FIG. 6) is inserted.
Note that 38 is a rectangular hole that is also used for lug transportation.

In addition, in FIGS. 7 and 9, 40 is the foundation of the tank, 41 is a bottom plate, 42 is an annular plate, and 43 is a jack mound that supports the jack 26.

Next, the operation of this embodiment will be explained with reference to FIGS. 7 to 9. This is a case of annular plate replacement/repair work using the jack up jig having the above configuration.

First, as shown in FIG. 7, the annual plate 42 to be removed is separated from the tank side plate 29 and the tank bottom plate 41 in order to reduce the jack up load. At the same time, as shown in FIG. 8, the lug 31 is fixed to the lower part of the side plate 29 by welding (numeral 45 in the figure indicates a weld bead). Next, the jacket mound 43 is placed on the foundation 40 around the tank outer circumference.
Place an appropriate number of them. Then, the jig 21 is arranged, and then the support plate 23 and the lug 31 are joined with pins.
Next, the jack 26 is set on the mound 43, and the receiving plate 25 is brought into contact with the upper end of the jack lifting part, thereby completing preparations before jacking up.
FIG. 7 shows this state.

Next, the jack 26 is operated (to raise the elevating section), and the main body 22 is pushed up via the receiving plate 25.
As a result, the support plate 23 also rises, and the tank side plate 29 is lifted up via the pin 32 and the lug 31 (FIG. 9). Note that this jack up is performed by synchronizing all the jacks 26. At this time, the contact plate 27 is supported in the horizontal direction above the side plate 29. Next, with the side plate 29 raised by the required amount, remove the old annual plate 42 and lower the side plate 29.
Finish the lower end surface etc. with a grinder etc., and
Ground leveling and correction of foundation 40 will be carried out. After that, a new annular plate 42 is installed, and after welding of the annular plates 42 is completed, the side plate 29 is lowered by jacking down and returned to its original position. During this time, if the corrected foundation 40 is not damaged and the jacking stroke is within the jacking stroke, the jacking 2
There is no need to change the number 6, and the work can be done extremely smoothly. Furthermore, no excessive horizontal force is applied to the side plate 29, and its movement and deformation can be suppressed to a minimum. The auxiliary pin 37 is provided to avoid relative rotation between the lug 31 and the support plate 23, and thus to avoid the danger of the main body 22 falling.

(Effects) As explained above, according to the present invention, since the lug is fixed to the outer surface of the lower part of the side plate and the lug and the main body are connected with pins, the drawbacks of both the lug type and the fork type can be solved, and the effect on the side plate is It is possible to significantly reduce the horizontal force during jack-up work, minimize deformation during jack-up work, eliminate the need for reinforcement of the side plates, reduce the amount of welding on the lugs, and reduce the weight of the lugs. Improves efficiency. In addition, the foundation will not be damaged during work, eliminating the need to replace jacks during work, and
There is no fear that the main body will be pulled out from the side plate, and the side plate can be partially jacked up easily. Furthermore, even if the tank is equipped with a bearing plate, the jacking up operation becomes easy, and the main body can be attached and detached very easily, making the jacking up operation easy as a whole.

[Brief explanation of the drawing]

FIG. 1 is a side view showing one embodiment of the jack up jig according to the present invention, FIG. 2 is a rear view thereof, and FIG.
The figure is a side view of the lug, Figure 4 is a back view of the lug, Figure 5 is a front view of the pin, Figure 6 is a front view of the auxiliary pin, and Figure 7 is the installation of the jig. Fig. 8 is a rear view showing the welded part of the lug, Fig. 9 is a side view showing the jacked-up state by the jig, Fig. 10 is a side view showing the conventional jig, and Fig. 11 is a side view showing the state. Side view showing another conventional jig,
FIG. 12 is also a rear view thereof. 21... Jacket up jig, 22... Jig body, 23... Support plate, 26... Jacket, 27...
...Touch plate, 29... Tank side plate, 31... Lug, 3
2...Pin.

Claims (1)

[Claims] 1 An existing tank jacking jig for jacking up an existing tank, which includes a main body constructed in a tower shape and placed outside the existing tank, and a jig that protrudes from the lower end of the main body toward the side plate of the existing tank. a support plate connected to the protruding end of the support plate via a pin and fixed to the side plate; supported by the upper end of the main body;
A jig for jacking up an existing tank, comprising: a contact plate that comes into contact with the outer surface of the side plate of the existing tank; and a receiving plate that is fixed to the lower end of the main body and comes into contact with the lifting part of the jack.