JPS5950833B2 - Jig for jacking up existing tanks - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a jig for jacking up an existing tank.

Generally speaking, as a result of periodic inspections, storage tanks for petroleum, etc.
If it is discovered that it is necessary to repair the tank, such as modifying the bottom plate 2 or replacing the annular plate 3, the entire tank is lifted up with a jack and the specified repair work is carried out.

As a conventional method of jacking up an existing tank, there is a method as shown in FIG. 1, for example.

This is a gate-shaped jig in which the jack lug 6 of the jack-up jig 5 is welded to the outer surface of the tank side plate 4, and the side plate reinforcing steel 7 of the jack-up jig 5 is welded to the inner surface of the tank side plate 4. In this method, the tank side plate 4 is lifted by fixing it via the lug 8 and the taper pin 9, and then pushing up the lug 6 with a jack 10. However, such a conventional jack-up jig for an existing tank has many component parts, and the jack lug 6 and gate-shaped jig 8 are welded to the tank side plate 4. The problem is that it takes a lot of effort and time to jack up the tank, and if high-strength steel is used for the tank, excessive care is required in welding technology and management. It was hot.

This invention was made by focusing on these conventional problems, and allows the tank to be jacked up without welding a jig (such as a jack lug) to the tank side plate.The tank load is transferred to the outer circumference of the tank bottom plate. Insert the support plate of the jack up jig below to support it.

Also, since excavating a large amount of the foundation ground below the outer circumference of the tank bottom plate will make the tank unstable, the jack is installed at the bottom of the jig body outside the tank side plate. In this way, the jack up jig is subjected to a rotational moment depending on the horizontal distance between the tank support load point and the jack contact point. However, since the contact plate provided on the upper part of the jack up jig body contacts the upper part of the tank side plate, the rotational moment generated by the vertical distance between the jack contact point and the contact point of the contact plate counteracts and balances out the rotational moment. In addition, since the vertical distance is several times larger than the horizontal distance, the contact load of the plate applied to the tank side plate is much reduced compared to the load applied by conventional jack lugs, and the rigidity of the tank side plate is You can fight it alone. Further, by providing a tank support plate having an inclined surface, the bottom plate of the tank body can be easily replaced. By using the jack up jig according to the present invention, it is possible to excavate the foundation ground under the outer periphery of the tank bottom plate, weld the jack up jig to the tank side plate, or weld the jack up jig to the tank side plate. To solve the above-mentioned problems by eliminating the need to install reinforcing materials (for example, gate-shaped jigs, reinforcing steel, taper pins, etc.) to compensate for the excessive stress on the tank side plate caused by the fittings. It is an object. The present invention will be explained below based on the drawings.

2 to 4 are diagrams showing an embodiment of the jack up jig according to the present invention. First, to explain the configuration,
Reference numeral 11 denotes a jack up jig, the main body 12 of which is constructed in the shape of a tower with an appropriate height, as shown in FIGS. 2 and 3.

Reference numeral 13 designates a pair of tank support plates horizontally fixed to the lower end of the main body 12, and the front and rear ends of the support plates 13 protrude appropriately from the front and rear end surfaces of the main body 12, and the front ends have downwardly facing holes. An inclined surface 13A is formed at the rear end thereof, and an upward inclined surface 13B is formed at the rear end thereof.

14 is a contact plate that can freely come into contact with the outer surface of the tank side plate;
The main body 12 is pivotably mounted on the upper end of the main body 12 between a pair of triangular frame-shaped brackets 14A which are fixed and protruded from both sides of the other surface.

This contact plate 14 protrudes from the front and rear surfaces of the main body 12 at the front and rear positions of the main body 12 rotated by 180 degrees, and is set back from the front and rear ends of the support plate 13. It is designed so that it can come into contact with the outer surface.
15 is a receiving plate for receiving the lifting part of the jack, and the main body 12
It is installed horizontally at the bottom of the

Reference numeral 16 designates a receiving plate for a pull-out rod which receives the force of the pull-out rod mechanism 17 as shown in FIG. ing.

As shown in FIG. 4, the pull-out rod mechanism 17 has a stopper 1 at one end.
It has a threaded rod (pull-out rod) 18 to which 8A is fixed, and a pair of nuts 2 are attached to the threaded rod 18 via a pair of washers 19.
0 is screwed together. Receiving plate 16 for drawing rod, stopper 18A,
The threaded rod 18, washer 19, and nut 20 together constitute support plate extraction means. Next, the operation of the jack up jig in the above embodiment will be explained with reference to FIGS. 5 to 10.

As shown in FIG. 5, in order to reduce the jack-up load, the annular plate (old bottom plate) 3 to be removed is separated from the tank side plate 4 and tantalum bottom plate 2.

At the same time, an appropriate number of jack mounts 21 (only one is shown; the same applies hereinafter) are placed on the foundation 1 around the tank's outer periphery. Subsequently, on the mount 21, the support plate 13 of the jack up jig 11 is pushed between the lower surface of the annual plate 3 and the foundation 1. At this time, since the downwardly inclined surface 13A is formed at the front end of the support plate 13, part of the soil forming the foundation 1 can be pushed away and pushed in easily. By this pushing, the contact plate 14 at the upper end of the jack up jig 11 comes into contact with the upper part of the outer surface of the tank side plate 4. As shown in FIG. 6, the jack 10 is set on the mount 21, the upper surface of the elevating section 10A of the jack 10 is installed on the lower surface of the receiving plate 15 of the jig 11, and the elevating section 10A is raised.

When the elevating part 10A rises, the support plate 13 rises via the receiving plate 15 and the main body 12, so that the tank side plate 4 whose lower end is received by the support plate 13 is jacked up. During this upward movement, the side plate 4 is supported by the main body 12 via the contact plate 14 to prevent it from rolling or deforming. Conversely, the rotational moment of the jack up jig in the counterclockwise direction in the figure is supported by the rigidity of the tank side plate alone, without requiring any reinforcing material. It is preferable that the jack up be carried out simultaneously in a group of jacks arranged in an appropriate number on the outer circumference of the tank. As shown in FIG. 7, for safety, saddles 22 are inserted under the jacked-up side plate 4 at appropriate intervals to support the load of the side plate 4.

Next, while supporting the side plates 4 alternately with the jacks 10 and saddles 22, the build-up portion 23 serving as a welded joint connecting the lower end of the side plate 4 and the remainder of the annual plate 3 is removed using a gouge 24 or the like. Remove the remainder of Annular Plate 3. As shown in FIG. 8, new annual plates (new bottom plates) 30 are arranged in a ring shape on the foundation 1, and butt welding is performed between adjacent annual plates.

At the same time, loosen the jacks 10 of the jack up jig 11 one by one, rotate the main body 12 by 180 degrees on a horizontal plane, switch the front and back, and insert the upwardly inclined surface 13B at the rear end of the support plate 13 into the lower end of the side plate 4. So, Jyatsuki 10 again
Set it. At this time, the contact plate 14 can be brought into contact with the outer surface of the side plate 4 by inverting it by 180 degrees. Next, after completing the necessary work such as replacing the annular plates 3 and 30, as shown in FIG.
0 and lower the support plate 13 of the jack up jig 11.
Lower the tank side plate 4 until it rests on the annular plate '130.

Thereafter, the jack 10 is removed from the jig 11. As shown in FIG. 10, in order to lower the tank side plate 4 to a predetermined installation position, positioning guide plates 25 are appropriately disposed on the inner and outer peripheries of the side plate 4. Next, the drawing rod receiving plate 16 on the support plate 13 of the jack up jig 11 and the annular plate 3 are
0, and the pull-out rod mechanism 17 is set between the two. That is, insert the threaded rod 18 into the notch 16A of the receiving plate 16, and
A is temporarily fixed on the annular plate 3, and the nut 20 is engaged with the end surface of the receiving plate 16 via the washer 19. Subsequently, while adjusting and rotating the front and rear nuts 20, the receiving plate 16 is pushed by the feeding force, and the support plate 13 is pulled out from below the side plate 4 in parallel. At this time, since the support end of the tank side plate 4 of the support plate 13 is an upwardly inclined surface 13B, the load of the tank side plate 4 is applied as a component force in the extrusion direction of the support plate 13, making it easy to pull it out. can be done. Incidentally, the lowering of the tank side plate 4 and the pulling out of the support plate 13 are preferably carried out in a coordinated manner around the circumference of the tank, similar to the lifting of the jack. Finally, side plate 4 and new annual plate 3
All work is completed by welding with 0 and performing predetermined inspection work.

As explained above, according to the present invention, since the bottom surface of the tank side plate is supported and jacked up, there is no need to weld the jack up jig to the tank side plate, and the jack up jig can also be attached to the side plate from outside the tank. Since it only needs to be inserted into the bottom end, the labor, time, and cost required for the work can be greatly reduced.

Further, the jack up jig according to the present invention has a simple structure, and can be easily inserted into and supported at the lower end of the tank side plate, and conversely, can be easily pulled out from the lower surface of the tank side plate. The effect can be obtained that the effect can be made more noticeable. Furthermore, since the jacks are installed on the outside of the tank side plate, there is no need to excavate the foundation ground below the outer periphery of the tank bottom plate, and there is no risk of destabilizing the tank.

In addition, the load acting on the contact plate at the top of the jig body, which counteracts and balances the rotational moment of the jig generated by supporting the tank on the support plate, is reduced compared to conventional jigs, so a reinforcing material is provided on the side plate of the tank. There's no need. Note that a pair of backing plates for the jack up jig may be provided at the front and back, but if they are provided so that they can rotate 180 degrees, one side can be saved.

It is also possible to use a winch or the like as a means for pulling out the support plate, but if the pulling rod of the embodiment is used,
It has a simple structure and has the effect of allowing the support plate to be pulled out safely.

[Brief explanation of the drawing]

FIG. 1 is a side view of a conventional jig for jacking up an existing tank, FIGS. 2 and 3 are side and rear views showing an embodiment of the jig for jacking up an existing tank according to the present invention, and FIG. A side view showing an example of a pull-out rod mechanism, FIG.
Figures 6, 7, 8, 9 and 10 are
FIG. 3 is a side view or a perspective view sequentially illustrating the operation of the jack up jig shown in FIGS. 2 and 3. FIG. 1...Foundation, 2...Bottom plate, 3...
...Annual plate, 4... Tank side plate, 10... Jacket, 1]... Jacket up jig, 12... Body, 13. ...
・・Support plate, 13A, ] 3B・・・・Slope surface, 14
...Top plate, 15...Batch plate, 16...
...Receiver plate for pull-out rod, 18...Threaded rod (pull-out rod), 30...Annual plate (new bottom plate)
.

Claims (1)

[Scope of Claims] 1. A jack-up jig for an existing tank, which is used to raise the existing tank, remove the old bottom plate from the lower end of the existing tank, and then lower the existing tank onto the new bottom plate, which A main body constructed in the form of a shape and placed outside the existing tank, and a downwardly sloping main body that is fixed to the lower end of this main body and protrudes from the front and rear surfaces of this main body in the front and back direction and is inserted between the bottom plate of the existing tank and the foundation ground. a support plate that supports an existing tank on the front end or the rear end; a contact plate that is supported by the main body and comes into contact with the outer surface of the side plate of the existing tank at a position between the front and rear surfaces of the main body in the horizontal direction and an inclined surface formed at the front end or the rear end of the support plate; A receiving plate is fixed to the middle part in the direction and is movable up and down together with the main body by coming into contact with the lifting part of the jack, and after removing the old bottom plate from the lower end of the existing tank, the rear end of the support plate is removed from the lower end of the existing tank. A jack-up jig for an existing tank, characterized in that it is equipped with means for pulling out a support plate. 2. The jig for jacking up an existing tank according to claim 1, wherein the abutment plate is supported to be rotatable by 180 degrees with respect to the main body. 3. The support plate pull-out means includes a stop temporarily fixed to the new bottom plate, a pull-out rod receiving plate fixed to the side of the support plate, an end fixed to the stop and a middle part fixed to the pull-out rod. The present invention is characterized by comprising a pull-out rod which is screwed into nuts arranged on both sides of the rod receiving plate and which is rotated to pull out and move the support plate via the pull-out rod receiving plate. A jack-up jig for an existing tank according to claim 1.