JP2853822B2 - Dismantling method of cylindrical tank - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a method of sequentially cutting and removing a wall from a lower end side while lowering a large cylindrical tank as a whole.

[0002]

2. Description of the Related Art The present applicant has previously described Japanese Patent Application Laid-Open No. Hei.
And a gas tank disassembling method disclosed in Japanese Patent Application Laid-Open No. 3-287896. According to this method, as shown in FIG. 4, the piston 2 facing the inner periphery of the cylindrical wall 1 is fixed to the support base 5 fixed on the tank bottom plate 4 and arranged vertically on the outer periphery of the piston 2. In addition to the lowering guide means for the tank via the rollers 3, the means for preventing the tank from laterally moving is used.

In this method, as a method of supporting the lower end of the wall 1, a jack base 10 is provided on the outside, an outer jack 11 is disposed on the top, and a jack rod 12 of an inner jack 7 provided on the piston 2 is provided. A tank receiving plate 13 is arranged at the tip of the outer jack rod 12.

[0004] Then, the wall 1
While supporting the lower end portion of the upper side wall, the upper side thereof is blown, and the plate 13 at the blown portion is raised to support the blown upper side wall body 1. Each plate 13 is lowered to lower the entire tank, and thereafter the same work cycle is repeated to disassemble the tank in a drop-down manner.

According to this method, since the lowering guide is carried out while receiving the lateral force by the piston 2, compared with the conventional method of repeating the cutting operation and the lowering while supporting with a plurality of jacks, the disassembling is performed by a strong wind or an earthquake. There is no fear of horizontal displacement or buckling due to horizontal movement or eccentric force in the tank, and there is no need to replace jacks, so once set, the dismantling process is greatly simplified. There is.

[0006]

However, this method also has some problems. In other words, when arranging the piston 2 on the bottom plate 4, the sliding support of the wall 1 needs to be performed at the upper and lower two places on the side of the piston. Since the piston was lifted and held by the support base 5 in order to keep it higher, the support base 5 must be assembled with the piston raised, requiring materials and labor for preparation work, and taking much time for the work. There were drawbacks.

The present invention has been made to solve the above problems, and has as its object to disassemble a cylindrical tank in which the advantages of the piston as a horizontal force support base are effectively utilized and the equipment is simplified. It provides a method.

[0008]

In order to achieve the above-mentioned object, the present invention is to lower and anchor a piston opposed to the inner periphery of a cylindrical wall of a tank until the piston comes into contact with a bottom plate of the tank. A jack rod, which is provided at an appropriate interval on a jack receiving beam at a peripheral upper portion, is joined to a suspending jig supporting a lower end of the wall body, and a sliding bearing is provided on the suspending jig and the piston is provided. Leave the sliding bearing at the upper end of the, remove the sliding bearing at the lower end,
A guide for lowering the wall while receiving the lateral force of the tank by a sliding bearing of the hanging jig and a sliding bearing at an upper end of the piston, and cutting the wall in order from the lower end thereof; By alternately repeating the lifting and lowering operation of the hanging jig by the jack, the entire tank is lowered and disassembled.

[0009]

According to the above-mentioned method, the preparation work can be simplified by landing and anchoring the piston on the bottom plate and removing the lower sliding bearing. Then, the lower part of the tank wall is cut off at the lowered position of the hanging tool, and the work of raising the hanging tool by operating the jack at the cut point is repeated, so that the lower end of the tank wall is at a height corresponding to the cutting height. Is held. The dismantling operation is completed by lowering the suspenders all at once when the cutting operation is performed over the entire circumference and repeating the cycle of performing the cutting operation again. At this time, the piston receives the lateral force of the tank at two points above and below the sliding bearing provided on the piston and the sliding bearing provided on the suspension jig. Since the jack is supported by the jack receiving beam, there is no need to consider the horizontal component force due to the lateral movement of the piston during the lifting control.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings.

1 to 3 show a disassembly method according to an embodiment of the present invention. Reference numeral 20 denotes a gas tank formed in a substantially cylindrical shape, and reference numeral 22 denotes a piston landed on a bottom plate in the tank 20.

The tank 20 has a cylindrical wall 24 disposed around a bottom plate 20a, and an upper portion thereof is covered with a top plate 25. The wall 24 is erected to divide the ring into 20 equal parts. The outer periphery of the base column 24a is covered with a panel 24b.

[0013] The piston 22 is originally a so-called inner lid which rises and falls according to the amount of gas in the gas tank. Specifically, the piston 22 has a cylindrical truss structure having a concave upper surface at the center. Is lowered onto the bottom plate by evacuating the gas in the tank, and the peripheral portion is
4. The upper roller 26 and the lower roller (not shown) that are in sliding contact with the base column 24b are located at positions above and below the peripheral portion of the piston and facing the base column 24b of the wall body 24. Rollers have been removed.

A jack receiving beam 28 is disposed above the upper roller 26, and an equalizer 30 is provided on the receiving beam 28.
The jack 32 is arranged through the.

The jack receiving beam 28 is provided on a support (not shown) independent of the piston, and functions only as a reaction force receiving base for the jack 32. In addition,
The equalizer 30 is a device for equalizing the load of each jack 32.

At the lower end of a jack rod 34 vertically suspended from the lower part of the jack 32, a substantially L-shaped hanging jig 36 is disposed in the gap between the wall 24 and the piston 22 and supports the lower end of the wall 24. Are connected to each other, and support the lower end of the wall 24 (more precisely, it is the base 24a of the wall 24) with its hook-shaped tip of the horizontal portion 36a protruding outside the wall 24. .

A packing 38 as a sliding bearing that slides on the wall 24 is disposed above the vertical portion 36b of the hanging jig 36, and an outer peripheral portion of the piston 22 is provided at a lower rear portion of the vertical portion. A roller 40 is also disposed as a sliding bearing that is in sliding contact with the packing 38, and the lateral force of the wall 24 received by the hanging jig 36 is applied to the packing 38 and the roller 40.
To the piston 22 side.

Next, the lower portion of the wall body 24 is blown in sequence. The actual fusing position A is, as shown in FIG.
The fusing position A is set at a height of about 1.7 to 2.0 m from the ground surface in the horizontal direction along the lower part of the packing 38 provided in the area and the vertical direction for removing the wall 24 for each zone. No scaffolding is needed.

Since there is no obstacle around the wall 24, an automatic cutting machine having a plasma cutting machine or the like provided on an automatic traveling vehicle can be used, which can automate the fusing operation and save labor.

This fusing operation is performed by dividing the location of each suspending jig 36 into zones at circumferentially point-symmetrical positions. If the upper part of the suspending jig 36 is opened, FIG.
As shown in (b), the lifting jig is raised by the jack 32 or a crane (not shown), and the lower end blown by the jack 32 and the hanging jig 36 is repeatedly supported via the hanging jig. If a portion where the tool 36 is not disposed is cut along the fusing position A and cut off, the lower end of the wall body 24 is held in the air by each hanging jig 36 at the fusing position A.

Thereafter, when the jacks 32 are simultaneously lowered, the lower end of the wall 24 is grounded to the bottom plate 20a, and the fusing operation can be performed again.

By repeating the above-described work cycle, the tank 20 is sequentially dismantled from the lower end in a darting manner.

The control of the speed and the applied load of each jack 32 is carried out by a computer provided in a central control room or the like installed outside the measuring data of the measuring equipment connected to each jack, and based on the measured data. Optimal control can be achieved by controlling. At this time, since the jack 32 is vertically supported by the jack receiving beam 30 and no horizontal component acts, the analysis of the measurement data is easy and the control is easy.

If a horizontal force acts on the tank 20 due to a wind, an earthquake, or the like during the above operation, the horizontal force is transmitted to the upper side of the piston 22 via the upper roller 26.
On the lower side, the packing 3 provided on the hanging jig 36 is used.
8. Similarly, the power is transmitted to the piston 22 via the roller 40. Since the piston 22 is fixed to the bottom plate 20a,
This horizontal force can be sufficiently resisted.

In this embodiment, the jack base is attached to only one side of the wall 24, but the jack base may be provided on both sides of the wall 24 as long as it has the packing 38 and the rollers 40.

[0026]

The present invention has been described in detail with reference to the embodiments.
In addition, the sliding bearing of the hanging jig replaces the lower roller
Eliminates the risk of lateral shake and buckling of the tank in charge
The tank wall above the lower roller position.
The lower part can be cut. Therefore, hanging on the side of the tank
The jig can be moved up and down, eliminating the need for a support base.
You. Therefore, the method for dismantling a cylindrical tank according to the present invention has the following effects. Compared with the related art, the piston may be directly landed on the bottom plate and anchored, and the need for a support base can be saved, so that materials for dismantling preparation can be saved and work can be shortened. As the lifting jig moves up and down the side of the piston,
The jack rods can be shorter than those that have been raised and lowered at a level lower than the lower end of the ton , so that the stability of the jack system is better.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing the entire method of dismantling a cylindrical tank according to the present invention.

FIG. 2 is a sectional view of the same.

FIG. 3 is a partially enlarged view of FIG. 1, and FIG. 3 (a) is an enlarged sectional view of a main part in a state where a jack is lowered. (B)
FIG. 3 is an enlarged sectional view of a main part in a state where a jack is raised.

FIG. 4 is an enlarged sectional view of a main part showing a conventional method of dismantling a cylindrical tank.

[Explanation of symbols]

 Reference Signs List 20 tank 20a bottom plate 22 piston 24 wall body 26 upper roller (sliding bearing) 28 jack receiving beam 32 jack 34 jack rod 36 hanging jig 38 packing 40 roller (sliding bearing)

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) E04G 23/08

Claims (1)

(57) [Claims] 1. A piston opposed to the inner periphery of the cylindrical wall of the tank is lowered and anchored until it contacts the bottom plate of the tank, and an appropriate interval is provided on the jack receiving beam at the upper part around the piston. The rod of the jack provided is connected to a suspension jig supporting the lower end of the wall body , a slide bearing is provided on the suspension jig, and the slide support at the upper end of the piston is left, and the slide support at the lower end is removed. ,
A guide for lowering the wall while receiving the lateral force of the tank by a sliding bearing of the hanging jig and a sliding bearing at an upper end of the piston, and cutting the wall in order from the lower end thereof; A method for dismantling a cylindrical tank, wherein the lifting and lowering operation of the hanging jig by the jack is alternately repeated to lower and dismantle the entire tank.