JPH09324544A - Method of tank demolishing construction - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of tank demolishing construction, by which the term of works is shortened and construction cost can be reduced by eliminating the need for high-place operation for a prolonged term and the temporary installation of a large-scale work platform. SOLUTION: A plurality of places in the circumferential direction at the lower end section of a tank side plate 2 are cut in a portal type and removed while leaving residual sections 4 among the mutual places, jacks 6 arranged to each of the notched sections 5 are jacked up so as to be able to bear the load of the side plate 2 and a roof 3 and an initial state for starting demolishment operation is prepared, and each residual section 4 is cut in the portal type up to places higher than the upper ends of the notched sections 5 and taken off. Accordingly, sections borne by each jack 6 are used as new residual sections, each jack 6 is jacked down, other jacks are disposed to each of the notched sections opened among the new residual sections and jacked up so as to be able to bear the load of the side plate 2 and the roof 3, and subsequently operation procedure from the initial state is repeated similarly and the side plate 2 is demolished.

Description

Detailed Description of the Invention

[0001]

The present invention relates to petroleum, LPG, L
The present invention relates to a tank dismantling method for storing NG or the like.

[0002]

2. Description of the Related Art When rebuilding or removing a large tank for storing petroleum, LPG, LNG or the like, it is necessary to disassemble the tank into a size that can be transported by loading it on a truck or the like. .

Conventionally, in the case of disassembling such a tank, a large-scale work scaffold is temporarily installed around the tank, and the worker uses the work scaffold in order from the upper structure of the tank to a proper size with a burner. It was cut into pieces and hung on the ground with a large crane.

[0004]

However, in such a conventional dismantling method, work in a high place where workability is poor is required for a long time, and much time is required for temporarily setting a work scaffold. Therefore, there is a problem that the construction period becomes longer and the construction cost increases.

The present invention has been made in view of the above circumstances, and provides a tank dismantling method capable of shortening the construction period and reducing the construction cost by eliminating the need for work at a high place for a long time and temporary provision of a large-scale work scaffold. The purpose is to do.

[0006]

SUMMARY OF THE INVENTION According to the present invention, a plurality of circumferential positions in a lower end portion of a tank side plate are cut and removed in a gate shape while leaving a remaining portion between each other, and then an opening is formed between the remaining portions. A jack is arranged in each of the notched parts, and an initial state for starting the disassembling work by jacking up each jack to support the load of the tank side plate is prepared. By cutting in a gate shape to a position higher than the upper end and removing it, the part supported by each jack is formed as a new remaining part, and each jack is jacked down to a predetermined height position and then new. A new jack different from each jack is placed in each of the notches that are open between the remaining portions, and each jack is jacked up so as to support the load of the tank side plate, and thereafter, from the initial state. of Those relating to the tank demolition method, which is characterized in that the work procedure is repeated similarly to dismantle the tank side plate.

In this way, most of the demolition work can be performed on the ground, so that it is not necessary to perform a long-time high-altitude work or a large-scale temporary work scaffold as in the conventional art.

When dismantling a tank in which the tank roof is joined to the upper end of the tank side plate, most of the tank side plate is dismantled so that the tank roof is lowered to the tank bottom and then dismantled. In this case, it is possible to perform the dismantling work of the tank roof, which has been conventionally performed at a high place where workability is poor, on the ground.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

1 to 9 show an example of an embodiment for carrying out the present invention. In FIG. 1, reference numeral 1 denotes a ground type tank 1 to be dismantled, and a body portion of the tank 1 is cylindrical by a tank side plate 2. A dome-shaped tank roof 3 is joined to the upper end of the tank side plate 2.

When disassembling the tank 1 having such a structure, first, the storage liquid and the vaporized gas in the tank 1 are extracted and made empty, and then the atmosphere in the tank 1 is replaced with air. Remove internal accessories (level gauge, thermometer, nozzle, etc.) with.

When the dismantling preparation is completed as described above, FIG.
As shown in FIG. 5, a plurality of circumferentially-shaped portions at the lower end portion of the tank side plate 2 are cut and removed in a gate shape while leaving a residual portion 4 therebetween, whereby a plurality of cutout portions 5 are formed at the lower end portion of the tank side plate 2. To open.

Next, as shown in FIG. 2, a notch portion 5 opened between the remaining portions 4 at the lower end portion of the tank roof 3.
The jacks 6 are arranged in each of the above, and each jack 6 is jacked up so as to support the load of the tank side plate 2 and the tank roof 3, and such a state is set as an initial state for starting the dismantling work.

Here, various methods such as a screw jack and a hydraulic jack can be adopted for the jack 6, and the upper end of the jack 6 that supports the upper end of the gate-shaped notch 5 is used. For example, as shown in FIG. 3, it is preferable to mount a guide 7 having a U-shaped cross section so that the tank roof 3 can be reliably supported without falling off.

Further, the upper end portion of the notch 5 supported by each jack 6 is preferably reinforced by a temporary material (not shown) if necessary, but each jack 6 has an acting load just below the tank side plate 2. On the other hand, since it can be supported without being eccentric, the temporary material for reinforcement need only be relatively small and can be reinforced relatively inexpensively.

When the initial state is prepared in this way, as shown in FIG. 4, each of the remaining portions 4 is cut in a gate shape to a position higher than the upper end of the notch 5 and removed, and is supported by the jacks 6. The existing portion is formed as a new remaining portion 4 '.

Next, as shown in FIG. 5, after jacking down each of the jacks 6 to a predetermined height position, as shown in FIG.
As shown in FIG. 5, a jack 8 different from the jacks 6 is newly arranged in each of the notches 5 ′ opened between the new remaining portions 4 ′, and the jacks 8 are attached to the tank side plate 2 and the tank roof. The jack 3 is jacked up so as to be able to support the load, and thereafter, the work procedure from the initial state described above is similarly repeated to continue the disassembly work of the tank side plate 2.

Specifically, after removing the jacks 6 that have been jacked down in the state shown in FIG. 6, as shown in FIG. 7, the remaining portions 4'supported by the jacks 6 are cut out into the notches 5. 'Cut out in a gate shape to a position higher than the upper end of',
The portion supported by each jack 8 that has been jacked up is formed as a new remaining portion 4 ″, and then each jack 8 is jacked down to a predetermined height position as shown in FIG. , The respective jacks 6 removed previously are arranged again in the respective notches 5 "opened between the new remaining portions 4" so that the tank side plates 2 and The work procedure of jacking up to support the load of the tank roof 3 is repeated.

In this way, when the disassembly of the tank side plate 2 is advanced from the lower end portion, as shown in FIG. 9, most of the tank side plate 2 is disassembled and the tank roof 3 descends to the tank bottom 9. So, regarding the tank roof 3,
It is sufficient to proceed with the dismantling work on the ground, and the tank roof 3
The disassembly operation of the tank 1 is completed by the disassembly.

Therefore, according to the above embodiment, most of the dismantling work can be performed on the ground, so that it is not necessary to perform a long-time work at a high place or temporarily construct a large-scale work scaffold as in the related art. Accordingly, it is possible to shorten the construction period and reduce the construction cost.

Further, the tank roof 3 can be dismantled efficiently and safely because the tank roof 3 can be dismantled on the ground, which has been conventionally performed at a high place where workability is poor.

The tank dismantling method of the present invention is not limited to the above-mentioned embodiment, and the tank roof is joined to the upper end of the tank side plate in the figure, but the tank is disassembled. It can also be applied when disassembling a floating roof tank in which the roof is floated on the liquid surface of the stored liquid.In this case, the tank roof lowered to the tank bottom by extracting the stored liquid is used as the tank side plate. Needless to say, the disassembly may be performed regardless of the disassembly state, and various changes may be made without departing from the scope of the invention.

[0023]

According to the tank dismantling method of the present invention described above, various excellent effects as described below can be obtained.

(I) Since most of the dismantling work can be performed on the ground, it is not necessary to perform long-time high-place work or temporary installation of a large-scale work scaffold as in the conventional art, thereby shortening the construction period. And reduction of construction cost.

(II) If the tank roof joined to the upper end of the tank side plate is lowered to the tank bottom by dismantling most of the tank side plate and then dismantled,
Conventionally, the tank roof can be dismantled on the ground, which has been conventionally performed at a high place where workability is poor, so that the tank roof can be efficiently and safely dismantled.

[Brief description of drawings]

FIG. 1 is a schematic view showing a state in which a notch is opened in a lower end portion of a tank side plate.

FIG. 2 is a schematic view showing a state in which a jack is arranged in the cutout portion of FIG.

FIG. 3 is a view in the direction of arrows III-III in FIG. 2;

FIG. 4 is a schematic view showing a state in which a remaining portion between the cutout portions of FIG. 2 is cut and removed.

5 is a schematic view showing a state in which the jack of FIG. 4 is jacked down. FIG.

FIG. 6 is a schematic view showing a state in which another jack is arranged in the cutout portion of FIG.

FIG. 7 is a schematic view showing a state where the remaining portion between the cutout portions of FIG. 6 is cut and removed.

FIG. 8 is a schematic view showing a state where the jack shown in FIG. 7 is jacked down.

FIG. 9 is a schematic view showing a state in which the tank roof of FIG. 8 is lowered to the bottom of the tank.

[Explanation of symbols]

 1 Tank 2 Tank Side Plate 3 Tank Roof 4 Remaining Part 4'Remaining Part 4 "Remaining Part 5 Notch 5'Notch 5" Notch 6 Jack 8 Jack 9 Tank Bottom

Claims (2)

[Claims] 1. A plurality of circumferential circumferential portions of a lower end portion of a tank side plate are cut and removed in a gate shape while leaving a remaining portion between each other, and then cut into notches formed between the respective remaining portions. Arrange the jacks, prepare an initial state for starting the dismantling work by jacking up each jack so as to support the load of the tank side plate, and make each remaining part into a gate shape to a position higher than the upper end of the cutout part. By cutting and removing
A portion supported by each of the jacks is formed as a new remaining portion, the jacks are jacked down to a predetermined height position, and then each of the notch portions opened between the new remaining portions is formed. Characterized by arranging a new jack different from the jack, jacking up each jack so as to support the load of the tank side plate, and thereafter disassembling the tank side plate by repeating the same procedure from the initial state. Tank dismantling construction method. 2. The tank disassembly method according to claim 1, wherein the tank roof joined to the upper end of the tank side plate is dismantled by lowering the tank side plate to the bottom of the tank by dismantling most of the tank side plate. .