JP3574477B2 - Cutting and dismantling method of large spherical storage tank - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to a cutting and dismantling method for a large storage tank, and more particularly to an improvement in a disassembly method for cutting a large spherical storage tank for storing a gas tank and a liquid while cutting an outer shell member as a main body thereof.
[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 (see FIG. 3 ). Such a large storage tank is formed of a metal or a composite of a metal and a heat insulating material thereof. Since aging cannot be avoided, the tank is dismantled every predetermined number of years, for example, every 20 years to ensure safety. New facilities need to be built. 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, the outer shell member is cut using a burner or the like for each predetermined size, and hanging pieces called shackles are attached to the outer surface of the cut portion at a plurality of locations, respectively, and this is used for a crane truck or the like. One method is to lift them one by one, peel them off, and transport them (see FIG. 3 ).
[0003]
[Problems to be solved by the invention]
In this case, the worker is forced to climb to the upper part of the large storage tank to perform a cutting operation and a mounting operation of the suspension piece, and also to perform a long-time high-place operation for accurately performing the suspension by the crane truck ( See Figure 3 ). 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.
[0004]
The present invention has been made in view of the various circumstances described above, and its purpose is to perform quick and smooth dismantling by a simple basic operation of lowering a cut part, and also work at a high place of an operator. An object of the present invention is to provide a method for cutting and dismantling a large spherical storage tank which can be reduced.
[0007]
[Means for Solving the Problems]
Cutting disassembling method of a large spherical tank according to 請 Motomeko 1,
A storage tank body is formed by a substantially spherical outer shell member having a predetermined thickness, and a method for dismantling a large spherical storage tank in which an object is stored in an internal space of the storage tank body while cutting the outer shell member. ,
An opening forming step of forming an opening of a predetermined size at the bottom of the outer shell member, and a cutting step of sequentially cutting along a spiral line extending at a predetermined interval from a position near the center of the ceiling of the outer shell member. After or in parallel with the cutting step, the outer shell is pulled down from the opening formed in the opening forming step to the outside through the inner side of the outer shell member sequentially from the center end of the ceiling portion of the cut portion. It is characterized in that chromatic and reductions step to continue to dismantle the member.
[0008]
[Action]
According to the method for dismantling a large spherical storage tank according to claim 1,
A cutting process is performed along a spiral line from a position near the center of the ceiling of the outer shell member, which is the main body of the large spherical storage tank, and the spirally cut portion is bent downward by its weight and descends. . Thus when the starting end portion of the central portion of the severed ceiling operates pulling downward (pull down step), as if peeling while dismantled Tokoro constant width as the outer shell member from the ceiling portion going peeled apple peel It is possible to continue. Further, in the lowering step, the lowering operation is performed from the center side end of the cut portion to the outside through the opening formed in the opening forming step sequentially through the inside of the outer shell member, so that the disassembling operation is more rapid. It will be.
That is, as compared with the conventional operation of cutting each predetermined size and individually carrying them out, the number of workers and work time at high places is extremely small, and a simple lowering operation using weight is required. The disassembly proceeds quickly by the operation. For example, the lowermost portion of the substantially spherical tank can be cut out in a circular shape to form an opening, and a cut portion can be drawn out from the opening. Therefore, even if there is no large space for dismantling work around the large storage tank, the dismantling can be easily performed.
Embodiment
[0012]
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows an example in which a gas tank 100 having a substantially spherical outer shell member 10 is disassembled. The outer shell member 10 of such a gas tank 100 is formed by combining a metal having a thickness of, for example, 9 mm to 30 mm or a resin as a heat insulating material, and is cut by a burner or the like.
[0013]
At the bottom of the outer shell member 10, a circular opening 12 is cut and formed in advance. Then, the cutting process is started from the ceiling of the outer shell member 10, and the cutting along the spiral line 11 as shown in FIG. When such cutting is sequentially performed, the cut portion is gradually bent toward the inside of the outer shell member 10 from the center side, the starting end side of the cut portion, and falls due to its weight.
[0014]
In this state, an operation of pulling the starting end portion 14 of the cutting portion downward is performed as a “pulling down process”. This operation is performed, for example, by hanging the wire 16 or the like on the start end portion 14 and pulling the wire 16 downward. Since this operation is performed using the weight of the cutting portion, it can be performed without requiring a large force. In this manner, the outer shell member 10 serving as the storage tank main body can be spirally peeled off in a manner as if peeling an apple skin, so that the dismantling operation can be performed with continuity. The cutting process is sequentially continued, and a pulling-down operation is also performed in accordance therewith, and the work is performed up to the lower portion of the outer shell member 10, whereby the dismantling is completed.
[0015]
In addition, as shown in FIG. 1, the cutting step operation can be performed by an operator ascending above the outer shell member 10, as shown in FIG. 1. It is also possible to automatically perform the operation by the device 200 provided with the heat radiating unit 18 such as a burner. According to such an apparatus 200, the worker can perform disassembly with almost no work at height.
[0016]
Further, it is preferable to appropriately adjust the interval (width of the cut portion) of the spiral-shaped line 11 according to the size and thickness of the outer shell member 10. For example, as the thickness increases, the width decreases. Such settings are made. According to the disassembly work as described above, since the work is performed by pulling the inside of the tank using the weight of the cut portion, the influence on the outside of the tank 100, for example, the neighborhood resident is minimized. Can be In addition, there is no need to lift and transport the cut portion from above with a crane truck, and dismantling can be performed without requiring a large space around the tank 100.
[0019]
According to each of the above-described embodiments, it is necessary to cut the outer shell member 10 for each predetermined size, attach a hanging piece to the outer shell member 10 and perform a work of lifting the hanging piece with a crane truck as in the related art. However, all these operations become unnecessary, and long-time operations in such high places are also eliminated. Since the weight of the cut portion also helps the lowering operation, the lowering operation can be performed quickly and the dismantling time can be reduced.
[0020]
Note that the present invention is not limited to the configuration of the above embodiment, and various modifications can be made within the scope of the invention. For example, in the pull down process, an example of pulling down over the wires, etc. 16 in the portion of the starting end 14 of the cutting unit, such as a vehicle device having an arm provided at the tip of the clamping means is not limited thereto It is also possible to perform a pulling-down operation with an object.
[0021]
【The invention's effect】
As described above, according to the method for cutting and dismantling a large spherical storage tank according to the present invention, the bending operation due to the weight of the spiral cut portion of the ceiling and the lowering operation from below through the opening provided at the bottom are mainly performed. Since the dismantling is advanced as an operation, the weight of the cutting part also works well for lowering work, the dismantling work time is significantly reduced compared to the conventional method, the work time at high places is also significantly reduced, and work safety is also contributed can do. As a result, labor costs for dismantling can be reduced, and adverse effects on the demolition site are reduced.
[Brief description of the drawings]
FIG. 1 is an explanatory view showing an example of dismantling work of a large storage tank having a substantially spherical shape.
FIG. 2 is an explanatory view of a spiral cutting line.
FIG. 3 is an explanatory view of a conventional disassembly operation.

Claims (1)

A storage tank body is formed by a substantially spherical outer shell member having a predetermined thickness, and a method for dismantling a large spherical storage tank in which an object is stored in an internal space of the storage tank body while cutting the outer shell member. ,
An opening forming step of forming an opening of a predetermined size at the bottom of the outer shell member;
A cutting step of sequentially and continuously cutting along a spiral line extending at a predetermined interval from a position near the center of the ceiling of the outer shell member,
After or in parallel with the cutting step, the outer shell member is pulled down from the opening formed in the opening forming step to the outside through the inner side of the outer shell member sequentially from the center side end of the ceiling portion of the cut portion. A lowering process to dismantle
Cutting disassembling method of a large spherical tank, wherein, characterized by have a.

Images