JP3557257B2 - Dismantling method of large spherical storage tank and jack mechanism used therefor - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to a method for dismantling a large spherical storage tank and a jack mechanism used for the method, and in particular, a method for dismantling a large spherical storage tank for storing gas or liquid while cutting an outer shell member of the main body, and a tank main body at the time of disassembly. The present invention relates to a jack mechanism for lifting a vehicle.
[0002]
[Prior art]
As a facility for storing a large amount of gas or liquid, a large storage tank such as a gas tank having a spherical or cylindrical shape is widely used.
Such a large storage tank is formed of a metal or a composite of a metal and a heat insulating material thereof. Since it is not possible to avoid aging, it is necessary to disassemble the tank every predetermined number of years, for example, every 20 years. And it is necessary to build a new storage facility.
[0003]
In dismantling a large storage tank, it is necessary to first disassemble an outer shell member having a predetermined thickness, which is the main body of the large storage tank. Conventionally, as shown in FIG. 5, the outer shell member 10 is cut using a burner or the like for each predetermined size, and hanging pieces called shackles are provided at a plurality of positions on the outer surface of the cut portion. , Which are lifted one by one using a crane truck or the like, peeled off, and transported.
[0004]
[Problems to be solved by the invention]
In this case, an operator is forced to climb a large storage tank to perform a cutting operation, a mounting operation of a suspension piece, and a long-time high-place operation to accurately perform suspension by a crane truck. For this reason, an operation for forming a large-scale scaffold around the large storage tank is also required. Further, when there is not enough space around the large storage tank, the operation of the crane truck is restricted, and the operation is extremely difficult.
In addition, since the cutting and hanging movements are repeated for each predetermined size, a long time is required, and adverse effects are exerted on neighboring residents. In addition, dismantling costs are very high.
In particular, in the case of a large spherical storage tank, the formation of a scaffold is extremely difficult because the side walls are curved as compared with a cylindrical storage tank, and the work time required for the formation of the scaffold is also long.
[0005]
The present invention has been made in view of the above various circumstances, and an object of the present invention is to disassemble a large spherical storage tank quickly and smoothly with a small amount of labor, and to reduce the work of workers at high places. An object of the present invention is to provide a method for dismantling a large spherical storage tank and a jack mechanism used for the method.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, a method for dismantling a large spherical storage tank according to claim 1 comprises:
A storage tank body composed of a large spherical outer shell member, and a plurality of support legs, one end of which is fixed to the outer part of the storage tank main body and the other end is disposed on the installation ground to support the storage tank at a predetermined height. In the method of disassembling a large spherical storage tank provided, a bottom cutting step for cutting a predetermined range of a bottom of the storage tank main body, and a jack mechanism is inserted from a bottom opening formed in the bottom cutting step to set an upper position inside the storage tank main body. A main body lifting step of pushing up with a jack mechanism, and after the main body lifting step, a ground-breaking step of cutting the support legs to bring the storage tank main body into a state where the storage tank main body is supported only by the jack mechanism, and a lower end side of the storage tank main body And a storage tank main body cutting step of reducing the height supported by the jack mechanism.
[0008]
The method for dismantling a large spherical storage tank according to claim 2 is characterized in that the cutting in the storage tank main body cutting step is performed by continuously drawing a cutting line spirally at a predetermined interval.
[0009]
The method for dismantling a large spherical storage tank according to claim 3 is characterized in that the supporting storage tank body is rotated in conjunction with the lowering operation during the cutting operation in the storage tank body cutting step.
[0010]
The jack mechanism according to claim 4 ,
The jack mechanism used in the body lifting step in the method according to claim 1 , wherein one or a plurality of interconnected support arms that push up the inside of the storage tank body at an upper end portion, and a lifting mechanism that raises and lowers the support arm. A rotating portion provided at a contact portion of the upper end of the support arm with the storage tank main body to allow a horizontal rotation operation of the storage tank main body in the pushed-up state, and rotating the at least one rotation portion of the support arm. A rotation drive mechanism for rotating the storage tank body in the horizontal direction.
[0011]
The jack mechanism according to claim 5 ,
The jack mechanism used in the body lifting step in the method according to claim 1 , wherein one or a plurality of interconnected support arms that push up the inside of the storage tank body at an upper end portion, and a lifting mechanism that raises and lowers the support arm. A support base mounted on the support arm and a lifting mechanism, the base being rotatable in a horizontal direction, and a base driving mechanism for rotating the base when the storage tank body is pushed up.
[0015]
[Action]
The method for dismantling a large spherical storage tank according to claim 1 is
A bottom opening is formed by the bottom cutting step, and a jack mechanism is inserted and installed into the storage tank from the bottom opening. Although the insertion of the jack mechanism depends on the supported height of the storage tank main body, a method of inserting the jack mechanism as it is or a method of assembling at the position where the jack mechanism is to be installed are adopted. Then, the jack mechanism pushes up the inner upper position of the storage tank body (lifting step), and then cuts the support legs to be supported by only the jack mechanism (landing step). In this state, the storage tank main body is sequentially cut from the lower end side, and at the same time, the height supported by the jack mechanism is reduced (a storage tank main body cutting step).
According to this method, since the storage tank main body is sequentially cut from the lower end side, that is, the cutting operation can be performed from a lower portion of the storage tank main body. Therefore, large-scale preparation work such as construction of a scaffold for working at height is not required. Then, with the cutting operation, an operation of lowering the supporting height of the supporting storage tank body is performed, so that the cutting operation can always be performed at the lower position also on the upper part of the storage tank body.
In addition, according to each of the above steps, since dismantling can be completed by working only in a low place until the end, work at a high position of the spherical storage tank with danger, for example, work of cutting the storage tank main body for each predetermined size And the troublesome work of sequentially transporting it with a crane or the like.
In particular, since the jack mechanism is lifted from the inside of the storage tank main body, it can be effectively applied even when the space outside the storage tank main body is not sufficient.
[0016]
According to the disassembling method according to claim 2 , in the storage tank main body cutting step, the storage tank main body is cut spirally at predetermined intervals, so that the storage main body is cut from below as if peeling apples. It becomes. As a result, the cutting operation can be performed continuously, the operation time can be reduced, and the part to be cut goes down due to its weight, and the collection operation is very simple.
[0017]
According to the disassembly method according to the third aspect , the operation of rotating the storage tank main body in accordance with the cutting operation in the storage tank main body cutting step is performed. Thus, in addition to the lowering operation of the storage tank main body, it is possible to perform the cutting operation performed using, for example, a burner or the like at almost one fixed position. That is, since the cutting operation can be performed while rotating the storage tank main body at a predetermined cutting location, it is possible to continuously perform the cutting of the predetermined width at the same location. Thereby, the disassembly of the storage tank main body by cutting becomes smoother.
[0018]
According to the jack mechanism of the fourth aspect , one or a plurality of support arms for pushing up the storage tank main body are vertically moved by the vertically moving mechanism. A rotating portion is provided at the upper end of the support arm that comes into contact with the storage tank main body and allows the storage tank main body to rotate in the horizontal direction while supporting the storage tank main body. That is, the rotation of the rotating portion allows the rotation of the storage tank body in contact therewith. The rotating portion of at least one support arm is provided with a rotation driving mechanism for rotating the rotating portion, and the rotation of the driving mechanism is transmitted to the contacting tank body, and the tank body is supported. In this state, a horizontal rotation operation is performed. In this way, while the storage tank body is lifted up by the support arm, it can be rotated in the horizontal direction, so that the entire circumference of the storage tank body is cut at a predetermined position from the lower end at a predetermined width. A cutting operation can be performed.
[0019]
Next, according to the jack mechanism according to claim 5 , one or a plurality of connected support arms are moved up and down by an elevating mechanism, and the support arms are installed on a rotatable base. By rotating the base in the supported state, the entire support arm can be simultaneously circularly moved in the horizontal direction. Therefore, the tank main body can be rotated in the horizontal direction in the same manner as in the fifth aspect by performing a circular motion of the base while the storage tank main body is lifted by the support arm. Thereby, dismantling by cutting from the lower end side of the storage tank body becomes smoother.
[0020]
【Example】
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 shows a basic process of dismantling a large spherical storage tank using the dismantling method according to the embodiment.
FIG. 1A shows a general installation state of the large spherical storage tank 100.
As shown, the storage tank body 10 is formed of a hollow spherical outer shell member, and is supported at a predetermined height by a plurality of support legs 12. Although not shown in the figure, an operator's passage or the like used for inspection of the storage tank or the like is formed slightly above the center line (equatorial line) of the storage tank body 10.
[0021]
FIG. 7B shows a step of applying a force 200 capable of supporting the storage tank main body 100, and an upward force is applied.
Next, FIG. 3C shows an operation of cutting the support leg 12 (ground cutting step) in order to support the storage tank main body 10 only by the force 200.
[0022]
FIG. 4D shows a step of cutting the storage tank body 10 from the lower end side, and in this embodiment, an example of a so-called ring-cut type in which the storage tank body 10 is cut in a predetermined width in a horizontal direction. At this time, the support height of the storage tank main body 10 is lowered together with the cutting operation. That is, the cutting operation can always be performed at a low position. The cut piece 10a falls obliquely while hanging from the cut side as shown in the figure. That is, the cut portion can be processed while utilizing gravity.
The disassembly is completed by sequentially cutting in this manner. Therefore, it is not necessary to carry out the work of sequentially transporting the cut pieces 10a by a crane or the like or to perform the cutting work at a high place, and the disassembly work can be made safe, smooth and quick.
[0023]
Next, FIG. 2 shows a more specific process, and shows an example in which a jack mechanism moves the storage tank body up and down.
FIG. 7A shows the state of the bottom cutting step, which is the first step of the present embodiment.
That is, in FIG. 2A, an operation of forming an opening 400 by cutting a portion indicated by a broken line 300 shown at a lower position of the storage tank main body 10 is performed. This cutting operation is a cutting operation at a relatively low position of the storage tank body 10, and since the cut piece lands directly on the ground from the cutting side as it is cut, it can be performed without much difficulty. is there.
[0024]
FIG. 2B shows a state where the jack mechanism 14 is inserted into the storage tank main body 10 from the opening 400 formed. The jack mechanism 14 has a support arm 16 for pushing up the storage tank body 10 from the inside. In the present embodiment, three are provided, but depending on the size of the storage tank body 10 or the thickness of the support arm 16, only one may be provided, or four or more may be provided.
Each support arm 16 is connected by a connecting member 18 in order to stabilize the elevating state. Each support arm 16 is moved up and down by an elevating device 20 provided at a lower position thereof. When the size of the storage tank body 10 is relatively small, such a jack mechanism 14 is assembled so as to be inserted into the storage tank body 10 at the installation position.
[0025]
Then, the operation of raising the support arm 16 and pushing up from the inside with a force capable of supporting the storage tank body 10 by itself is performed.
As described above, since the storage tank main body 10 is supported from the inside of the storage tank main body 10 through the opening 400 at the bottom of the storage tank main body 10, there is no large space around the storage tank main body 10 or the storage tanks are adjacent to each other. In such a case, it is possible to carry out the lifting work without taking up space.
[0026]
Next, as shown in FIG. 1C, the same ground separation process as that of FIG. 1C is performed, and the tank main body 10 is supported only by the jack mechanism 14.
In this state, an operation of cutting the storage tank main body 10 with a predetermined width W from the lower end side is performed as shown in FIG. In this embodiment, an example is shown in which the apple is peeled continuously at a predetermined width.
At this time, the jack mechanism performs an operation of sequentially lowering the height position supporting the storage tank body 10 in accordance with the cutting operation. That is, the operator can continuously perform the cutting operation of the storage tank main body 10 at a constant height position (relatively low position).
[0027]
In particular, since the cut portion cut in a spiral shape hangs down sequentially and lands in a spiral shape, the collection is very easy.
Thus, the scalping and cutting are continuously performed, and only the ceiling 10b remains as shown in FIG. Then, the work of dismantling the storage tank main body 10 is completed by removing the ceiling portion 10b which has come to a relatively low position.
In this way, the disassembly of the spherical storage tank is easily and smoothly completed by the cutting operation at the low position, the lifting and lowering operation of the storage tank main body by the jack mechanism 14, and the continuity of the cutting operation.
[0028]
FIG. 3 shows another configuration example of the jack mechanism 14 used in the disassembly method. The configuration shown in FIG. 2A has four support arms 16, which are interconnected by a connecting member 18. In the present embodiment, the elevating mechanism 20 of the support arm 16 is configured to be housed in an integral casing. However, the present invention is not limited to such a configuration. It is also possible.
[0029]
FIGS. 7B and 7C show a specific configuration example of the distal end of each support arm 16. As shown in the figure, a rotating body 24 rotatably supported by a shaft 22 is provided at the distal end. The rotating body 24 has an elastic member such as a comb disposed on the surface thereof. Then, as shown in FIG. 2C, the upper end pushes up the inside of the ceiling of the storage tank body 10. The rotator 24 allows the tank body 10 to rotate in the horizontal direction while supporting the tank body 10. That is, when the storage tank main body 10 is rotated, the rotating body 24 is rotated accordingly.
[0030]
Next, FIG. 3D shows a configuration example in which a rotation drive mechanism 26 for rotating and driving a rotating body 24 provided on at least one of the support arms 16 is shown. The rotating body 24 can be rotated by the rotation driving mechanism 26. And the storage tank main body 10 supported by this rotation drive will rotate simultaneously. Thereby, the cutting operation of the storage tank main body 10 shown in FIG. 2D can be performed over the entire circumference of the storage tank main body 10 without changing its position.
[0031]
FIG. 4 shows an example of a jack mechanism in which the support arm 16 itself is rotated or circularly moved in order to rotate the storage tank main body 10 supported by the support arm 16.
FIG. 1A shows a jack mechanism 14 that supports the storage tank main body 10 with only one support arm 16, and a lifting mechanism 20 for vertically moving the support arm 16 includes a base 30. It is installed above. The base 30 is rotated in the direction of the arrow 500 by the base rotating device 32.
[0032]
Thereby, the large-sized storage tank 10 can be rotated by rotating the base 30 in a state where the storage tank main body 10 is lifted by the support arm 16.
FIG. 2B shows an example in which three support arms 16 are provided and are similarly installed on the same base 30. Also in the case of the present embodiment, all the support arms 16 simultaneously perform a circular motion by rotating the base 30. Thereby, the storage tank main body 10 supported at three points also performs a rotational motion.
[0033]
By using the jack mechanism 14 that can rotate the storage tank main body 10 while supporting the storage tank main body 10, the storage tank main body cutting step of the disassembly method according to the present invention can be performed more easily and smoothly. That is, the operator cuts the storage tank body 10 at a predetermined width from the lower end side of the storage tank body 10 using a burner, an ultra-high pressure water injection device, or the like, but rotates the storage tank body 10 supported in accordance with the cutting speed. Accordingly, it is possible to cut the entire periphery of the storage tank main body 10 without changing the cutting operation position. Furthermore, since the support position of the storage tank main body 10 is gradually lowered by the jack mechanism 14, the work can be performed at substantially the same position until the cutting operation of the predetermined width is completed.
Accordingly, the cutting operation can be performed with the burner or the like fixed, which contributes to labor saving such as unmanned dismantling operation.
[0034]
It should be noted that the present invention is not limited to the configuration of each of the above embodiments, and various modifications can be made within the scope of the invention. For example, the above-described jack mechanism 14 is provided with a mechanism for rotating the supported storage tank main body 10. However, the present invention is not limited to such a configuration. Of course, it can be used. In this case, cutting is sequentially performed while changing the cutting position in the circumferential direction of the storage tank body 10.
[0035]
【The invention's effect】
As described above, according to the method for dismantling a large spherical storage tank and the jack mechanism used for the same according to the present invention, it is possible to dismantle a large spherical storage tank quickly and safely without taking up space with extremely little labor. Become. Accordingly, work at high places in dismantling is drastically reduced, and the work of forming a scaffold on the outside of the spherical storage tank, which has been a difficult operation, becomes unnecessary.
[Brief description of the drawings]
1 (A) is an explanatory view of an installation state of a normal large spherical storage tank, (B) is an explanatory view showing a lifting step, (C) is an explanatory view showing a ground cutting step, and (D) is a cutting step of a storage tank body. FIG.
2A is an explanatory view showing a bottom cutting step, FIG. 2B is an explanatory view showing a lifting step, FIG. 2C is an explanatory view showing a ground cutting step, and FIG. 2D is an explanatory view showing a storage tank body cutting step. FIG. 7E is an explanatory diagram showing a state immediately before the end of the dismantling work.
FIGS. 3A and 3B are explanatory views showing an embodiment of a jack mechanism having a rotation function, and FIGS. 3C and 3D are explanatory views of main parts thereof.
FIGS. 4A and 4B are explanatory diagrams of a jack mechanism having a rotation drive device of another configuration.
FIG. 5 is an explanatory view showing a conventional method for dismantling a large spherical storage tank.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Storage tank main body 12 Support leg 14 Jack mechanism 16 Support arm 18 Connecting member 20 Elevating device 24 Rotating body 26 Rotary drive device 30 Base

Claims (5)

A storage tank body composed of a large spherical outer shell member, and a plurality of support legs, one end of which is fixed to the outer part of the storage tank main body and the other end is disposed on the installation ground to support the storage tank at a predetermined height. In the method of dismantling a large spherical storage tank provided,
A bottom cutting step of cutting a predetermined range of the bottom of the storage tank body,
A body lifting step of inserting a jack mechanism from the bottom opening formed in the bottom cutting step and pushing an upper position inside the storage tank body by the jack mechanism,
After the main body lifting step, the support leg is cut, and a ground-cutting step in which the storage tank main body is supported only by the jack mechanism,
A tank body cutting step of sequentially cutting the tank body from its lower end side and simultaneously lowering the support height of the jack mechanism;
A method for dismantling a large spherical storage tank, comprising: The method for dismantling a large spherical storage tank according to claim 1 , wherein the cutting in the storage tank main body cutting step is performed by continuously drawing a cutting line in a spiral at predetermined intervals. The large spherical shape according to any one of claims 1 to 2 , wherein the supporting tank main body is rotated in conjunction with the lowering operation during the cutting operation in the storage tank main body cutting step. Dismantling method of storage tank. A jack mechanism used in a body lifting step in the method according to claim 1 ,
One or a plurality of interconnected support arms for pushing up the inside of the storage tank body at the upper end, an elevating mechanism for raising and lowering the support arm, and a contact part provided at an upper end of the support arm to the storage tank body. A rotating unit that allows a horizontal rotation operation of the storage tank main body in a pushed-up state, and a rotation drive mechanism that rotates the rotation unit of at least one of the support arms to rotate the storage tank main body in the horizontal direction. A jack mechanism characterized in that: In jack mechanism used in the main lifting steps in the method according to claim 1,
One or a plurality of interconnected support arms for pushing up the inside of the storage tank body at the upper end, an elevating mechanism for elevating and lowering the support arm, and the support arm and the elevating mechanism are installed on the upper part and rotated horizontally. A jack mechanism, comprising: a possible base; and a base drive mechanism for rotating the base when the storage tank body is pushed up.

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