JPH08296340A - Method for vertically mounting storage tank - Google Patents

Abstract

PURPOSE: To simply raise and lower a storage tank by using alternately first and second air bags adjoined and arranged to each other under the storage tank while inserting a sleeper under the air bags. CONSTITUTION: A foundation part 24 located just under a lower annular plate 22 of each of side plates 14 in a storage tank is excavated to form recess sections 26, and after a first air bag 18 is inserted in each of the recess sections 26, the air bag 18 is filled with compressed air and is expanded to raise the tank. Then, a plurality of sleepers 34 are arranged to an adjoining section 33 of each of the recess sections 26, and after a second air bag 36 is provided between the sleepers 34 and annular plate 22, the air bag 36 is filled with compressed air and is expanded, the tank is further raised. Then, the air bag 18 is contracted and is taken out of each of the recess sections 26, and after the sleepers 34 are arranged to the recess sections 26, the air bag 18 is provided between the sleepers 34 and annular plate 22. Then, the same process is repeated, and after the tank is raised up to a specific height, the bottom, etc., of the tank are maintained to inspect.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of raising and lowering a storage tank.

[0002]

2. Description of the Related Art Conventionally, in a large-sized storage tank for storing oil, gas, etc., when the work such as inspection of the bottom surface of the tank bottom plate, blast treatment, repair or painting is carried out, or the foundation of the storage tank is installed. When making corrections, the entire tank or the tank bottom plate was moved up and down so that the operator could work under the bottom plate.

As a means for raising and lowering the entire storage tank, for example, as described in Japanese Utility Model Laid-Open No. 59-87496, after fixing a plurality of jackup devices to the side portions of the storage tank, the jackup devices are fixed. It is known to control and elevate a storage tank.

As a means for raising and lowering only the bottom plate of the storage tank, there is a method described in Japanese Patent Publication No. 53-3812. According to this method, the bottom plate can be moved up and down by inserting the air bag under the bottom plate and inflating or contracting the air bag.

[0005]

However, when the whole of the storage tank is lifted and lowered by the jack-up device, the steps of attaching and detaching the jack-up device and the reinforcing material, surface finishing after detachment, inspection, etc. are required, There is a problem that a lot of processing and time are required.

Further, in the method of raising and lowering only the bottom plate of the storage tank by using the air bag, the storage tank can be floated to a sufficient height so that the worker can enter under the bottom plate in a standing posture. A large airbag was required, and a large number of airbags had to be uniformly arranged over the entire lower surface of the bottom plate. Further, since the annular plate located directly below the side plate of the storage tank cannot be lifted, there is a problem that the annular plate and the foundation therebelow cannot be operated.

The present invention has been made in view of such circumstances, and an object thereof is to provide a storage tank raising / lowering method capable of easily raising / lowering the entire storage tank.

[0008]

In order to achieve the above object, the method according to the present invention comprises a storage tank mounted on a foundation using an airbag which is inflated or deflated by injecting or evacuating air. A first step of excavating a plurality of predetermined portions of a foundation located immediately below an annular plate of a storage tank to form a plurality of recesses, and a first airbag in a contracted state in each of the recesses. Second step of inserting the first airbag to inflate the storage tank and raising the storage tank, and sleepers are arranged at the portions between the annular plate and the foundation that are adjacent to the recesses, respectively. A third step of placing a second airbag in a contracted state on the top, inflating the second airbag, and raising the storage tank;
After taking out the first airbag, a sleeper is arranged in each recess and the contracted first airbag is placed on the sleeper,
The fourth step of inflating the first airbag to raise the storage tank, and after taking out the second airbag, stack the sleepers on the sleepers on which the second airbag is mounted. A fifth step of placing the second airbag in a contracted state on the stacked sleepers, inflating the second airbag to raise the storage tank, and removing the first airbag, and then removing the first airbag A sleeper is further stacked on the sleeper on which the first airbag is mounted, the contracted first airbag is mounted on the stacked sleeper, and the first airbag is inflated to form a storage tank. A sixth step of raising,
It is characterized by including a seventh step of raising the storage tank to a desired height by repeating the fifth step and the sixth step.

[0009]

According to the above-mentioned method, the first airbag and the second airbag are alternately arranged between the annular plate and the foundation of the storage tank to inflate and the sleepers are placed under the airbags. By placing it, the entire storage tank can be raised.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the method for raising and lowering a storage tank according to this embodiment will be described below with reference to the drawings.

The raising and lowering method of the present invention can be applied to various storage tanks. In the following embodiment, the present invention is applied to the cone roof type storage tank 10 shown in FIG.
The cone roof type storage tank 10 mainly includes the bottom plate 1.
2, a fixed roof tank composed of the side plate 14 and the cone roof 16 and used as an oil tank or a gas tank.

When raising the storage tank 10 as described above, first of all, as a pretreatment, equipment necessary for carrying out the present invention,
For example, the air bag 18, the compressor, the sleeper 34, the excavating tool for the foundation, and the like are inspected, and the measurement point for measuring the rising height of the storage tank 10 is set.

Thereafter, as shown in FIG. 2, a predetermined portion of the foundation 24 located directly below the annular plate 22 (hatched portion in FIG. 2) is excavated to form a recess 26. The annular plate 22 is an annular portion of the bottom plate 12 of the storage tank 10 that is located directly below the side plate 14, and the concave portion is the annular plate 2.
Immediately below 2, at multiple locations at equal intervals in the circumferential direction, preferably 1
It is provided in two or more places. The size of the recess 26 is not particularly limited, but in consideration of the subsequent processing, it is preferable that the depth is 70 to 100 mm, the width is 1000 mm, and the depth is about 600 mm.

Next, in order to prevent the distortion of the bottom plate 12 by the support pillars 28 in the storage tank 10 as well as to take a predetermined anti-strain measure on the annular plate 22, the joint between the cone roof 16 and the side plate 14, the support pillars 28 and the bottom plate. A suspension wire 30 is stretched between the joint portion 12 and the joint portion 12 (see FIG. 1), and in order to prevent the bottom plate 12 from bending, a brace structure (not shown) provided on the bottom plate 12 is reinforced. Of course,
These operations may be performed as a pretreatment before forming the recess 26.

After the reinforcement work is completed, as shown in FIG. 3, the first airbag 18 is inserted into each of the recesses 26, and the airbag 18 is arranged directly below the annular plate 22.

The airbag 18 is a bag-shaped body made of a synthetic resin sheet, rubberized cloth, or the like.
It can be expanded or contracted by injecting or exhausting air into the inside through 2.

A compressor (not shown) is connected to the end portion of the air pipe 18 on the side not shown, and in this embodiment, compressed air having a pressure of 9 × 10 ⁵ Pa at the maximum is first.
Is supplied to the inside of the airbag 18.

When the placement of the airbag 18 is completed,
A final check is performed on the storage tank 10 and the airbag 18 before rising, and compressed air is injected into each airbag 18. The airbag 18 is inflated by the injection of compressed air,
The storage tank 10 is raised, but at this time, the storage tank 1
It is necessary to constantly measure the change in the height measurement point described above so that 0 does not incline, and appropriately control the amount of air supplied to each airbag 18 based on the measured value.

When the annular plate 22 rises to a predetermined height with respect to the upper surface of the foundation 24, in this embodiment about 150 mm, the injection of air into the airbag 18 is stopped and the annular plate 22 is provided in the flow path of the air pipe 32. The valve (not shown) is closed to maintain the state (see FIG. 4).

Next, as shown in FIG. 5 as viewed from the direction of arrow A--A in FIG.
A plurality of prismatic sleepers 34 are juxtaposed on each other (on the left adjacent portion in FIG. 5) in a state in which they are in close contact with each other, and air is discharged between these sleepers 34 and the annular plate 22 to be in a contracted state. The second airbag 36 is arranged.

The second airbag 36 is substantially similar to the first airbag 18 and can be inflated by injecting air through the air pipe 32. Therefore, when compressed air is injected into the second airbag 36 from the state shown in FIG. 5 by the above-mentioned compressor, the airbag 36 is inflated and the storage tank 10 is further raised as shown in FIG. Storage tank 10 with second airbag 36
Even in the case of the rise, the amount of air supplied to each airbag 36 is appropriately adjusted so as to prevent the tank from tilting. The rising height of the storage tank 10 is a predetermined amount, about 15 in this embodiment.
When it becomes 0 mm, the injection of air into the second airbag 36 is stopped and the air pipe 32 is closed. Then, air is discharged from the first airbag 18 and the first airbag 18 is taken out from the recess 26, and sleepers 34 stacked in a plurality of stages (three stages in the illustrated embodiment) are arranged in the recess 26.
The stack of the sleepers 34 is composed of a plurality of sleepers 34 in which the steps are juxtaposed in close contact with each other, and the sleepers 3 are provided for each step.
4 is assembled in a so-called cross beam shape in which the longitudinal direction is a right angle. The upper surface of such a stack and the annular plate 22
A predetermined space is left between the first and the second air bags 18, and the first air bag 18 in the contracted state taken out from the recess 26 is arranged at this space.

After that, the storage tank 10 is gradually raised by repeating the above steps. That is, the step of arranging and inflating the first airbag 18 and the second airbag 36.
The step of taking out, the step of stacking the sleepers 34 on the portion 33, the step of arranging and inflating the second airbag 36, the step of taking out the first airbag 18, and the step of stacking the sleepers 34 on the recess 26 are repeated. is there.

Finally, if the storage tank 10 is raised to a height at which a person can stand comfortably between the annular plate 22 and the foundation 24, for example 2100 mm, after the step of stacking the sleepers 34. Does not arrange the airbag 18 (or the airbag 36), and the other airbag 36
(Or, the air is discharged from the airbag 18). In this embodiment, after stacking the sleepers 34 of the portion 33, air is evacuated from the first airbag 18 to lower the storage tank 10, and as shown in FIG. The plate 22 is placed on the storage tank 1
Support 0. Incidentally, the first airbag 18 and the recess 26
If the sleepers 34 in FIG.
You may keep it in the state of.

When the floating of the storage tank 10 is completed,
In order to prevent deformation and distortion of the bottom plate 12, it is preferable to reinforce the lower part of the bottom plate 12. However, when the size of the storage tank 10 is relatively small, the bottom plate 12 is less likely to be deformed, so that it is not necessary to reinforce. Further, when the machine for correcting the foundation is carried in, it is preferable to support the bottom plate 12 with an appropriate support against vibration of the machine.
Furthermore, the storage tank 10 is usually very large and may therefore be anchored to improve stability to strong winds in the floating state.

In this way, after the storage tank 10 has been raised and the necessary reinforcements have been made, the back surface is blasted,
Necessary work such as repair and painting, or modification of the foundation is performed.

When these operations are completed, the storage tank 10 is gradually lowered by a procedure substantially reverse to the above-described raising operation. More specifically, the storage tank 10
Is placed on the sleeper stack 38, first from the state shown in FIG.
A sleeper stack is disposed in each recess 26 slightly lower than the sleeper stack 38 of the portion 33, and the deflated first airbag 18 is placed on the upper surface thereof. Next, the first airbag 18 is inflated to slightly raise the storage tank 10, and the storage tank 10 is supported by the airbag 18.
Next, the sleepers 34 from the uppermost stage to the several stages of the sleeper stack of the portion 33 are removed, and the second airbag 36 in a contracted state is placed on the upper surface of this sleeper stack. At this time, part 3
The upper surface of the sleeper stack of No. 3 is lower than the upper surface of the sleeper stack of the recess 26. When the installation of the second airbag 26 is completed, the airbag 26 is inflated, and the storage tank 10 is slowly lowered by gradually bleeding air from the first airbag 18. When the air in the first airbag 18 is completely discharged, the support for the storage tank 10 is transferred from the first airbag 18 to the second airbag 36.

It will be easily understood that the storage tank 10 can be lowered by repeating the above steps. That is, to briefly describe, the steps of taking out the first airbag 18, taking out the sleepers 34 from the sleeper stack of the recess 26, and arranging the first airbag 18,
Inflation of the first airbag 18, contraction of the second airbag 36, removal of the second airbag 36 and part 33
The step of taking out the sleeper 34 from the sleeper stack, the step of disposing the second airbag 36, and the step of inflating the second airbag 36 and the step of contracting the first airbag 18 may be repeated.

While the storage tank 10 is descending, if the bottom plate 12 reaches a predetermined height, for example, a position 450 mm above the upper surface of the foundation 24, the orientation position of the storage tank 10 is confirmed and the asphalt sand on the upper surface of the foundation 24 is checked. ,
It is preferable to check the state of asphalt mortar and the like.

After these confirmations are completed and the storage tank 10 is appropriately modified as necessary, the above descending work is further continued. The state in which the storage tank 10 is finally placed on the foundation 24 is as shown in FIG. 3, and then the first airbag 18 is taken out from the recess 26. Finally, the recess 26 is filled with asphalt sand, mortar, concrete, lightweight concrete plate (ALC plate), etc., and tension is applied to complete a series of tank elevating and lowering operations.

The above embodiment is a cone roof type storage tank 1
However, as described above, the present invention is applicable to various cylindrical tanks. For example, the present invention can also be applied to the floating roof tank 40 schematically shown in FIG. 9, and the tank can be moved up and down in substantially the same procedure as in the above-described embodiment. However, the floating roof tank 40 stores liquids such as crude oil and gasoline in a container formed by a bottom plate 42 and side plates 44, and a floating roof 46 for floating vapor loss is floated on the liquid surface of these tanks. Since it is a tank of the type, unlike the case of the cone roof type tank 10 described above, measures such as fixing the floating roof 46 are required when moving the tank up and down.

That is, when the floating roof tank 40 is moved up and down, the liquid is completely discharged in advance and the floating roof 46 is lowered. As shown in FIG. 10, a reinforcing plate 48 is fixed to the bottom plate 42 of the floating roof tank 46 by welding or the like, and a female screw member 50 is fixed to the reinforcing plate 48. A pillar (not shown) extending downward is attached to the floating roof 46, and the sleepers 54 are stacked in a reciprocating number of stages so as to surround the pillar. After this, the columns are pulled out. Then, attach the tie rods 52 having threaded portions at both ends to the floating roof 46.
The floating roof 46 is fixed by inserting the washer 60 into the sleeve 56, screwing the threaded portion at the lower end into the female threaded member 50, fitting the washer 60 to the threaded portion at the upper end, and screwing the nut 58.

In this state, the cone roof type tank 10
When the floating roof tank 40 is moved up and down in the same manner as in the above case, since the floating roof 46 is fixed to the tie rod 52, the floating roof 46 is largely displaced due to tilt or vibration when the tank 40 is moved up and down. There is no such thing.

Although the sleeper 34 has a prismatic shape in the above-mentioned embodiment, it is possible to use a sleeper having a flat plate shape or other shapes depending on the size of the storage tank and the like.

[0034]

As described above, according to the present invention, since the equipments such as the air bag and the sleeper which are easy to handle are used, the storage tank can be raised and lowered relatively easily. Therefore, it is possible to raise and lower the storage tank even if not a skilled worker.

Further, the air bag and the sleeper need only be arranged directly below the annular plate, and it is not necessary to arrange these equipments in the central portion of the tank bottom plate, so that the work of arranging and taking out the air bag and the sleeper can be facilitated. It can be carried out. Moreover, according to the present invention, since it is not necessary to process the side plate, which is required when using the jack-up device or the like, it is possible to shorten the construction period and reduce the cost.

Furthermore, since the storage tank is moved up and down by alternately using the first airbag and the second airbag, the storage tank can be raised to a desired height without using a large airbag. Therefore, each airbag may be relatively small. This is the transportation of airbags,
It facilitates maintenance and storage.

Further, according to the present invention, since the whole storage tank can be raised and lowered, maintenance and inspection of the whole tank bottom plate including the annular plate can be performed, and almost the entire foundation can be modified. Becomes

[Brief description of drawings]

FIG. 1 is a view schematically showing a cone roof type storage tank to which a lifting method according to the present invention is applied.

FIG. 2 is a diagram showing one step of a lifting method according to an embodiment of the present invention.

FIG. 3 is a diagram showing one step of a lifting method according to an embodiment of the present invention.

FIG. 4 is a diagram showing one step of a lifting method according to an embodiment of the present invention.

FIG. 5 is a diagram showing one step of the lifting method according to the embodiment of the present invention, and is a view taken along the line AA of FIG.

FIG. 6 is a diagram showing one step of a lifting method according to an embodiment of the present invention.

FIG. 7 is a diagram showing one step of a lifting method according to an embodiment of the present invention.

FIG. 8 is a view showing a storage tank lifted by a lifting method according to an embodiment of the present invention.

FIG. 9 is a view showing a floating roof tank to which the lifting method according to the present invention can be applied.

FIG. 10 is an enlarged view of a B part in FIG.

[Explanation of symbols]

10 ... Cone roof type storage tank, 12 ... Bottom plate, 14 ...
Side plate, 16 ... Corn roof, 18 ... First airbag,
22 ... Annular plate, 24 ... Foundation, 26 ... Recess, 32 ...
Air pipe, 34 ... Sleepers, 36 ... Second airbag, 3
8 ... Sleeper stack, 40 ... Floating roof tank, 42 ... Bottom plate,
44 ... side plate, 46 ... floating roof.

Claims (1)

[Claims] 1. A method of raising and lowering a storage tank (10) mounted on a foundation (24) using an airbag which is inflated or deflated by injecting or exhausting air, comprising: a storage tank (10); First step of forming a plurality of recesses (26) by excavating a plurality of predetermined portions of the foundation (24) located directly below the annular plate (22), and in each of the recesses (26) in a contracted state. A second step of inserting the first airbag (18) and inflating the first airbag (18) to raise the storage tank (10); the annular plate (22) and the foundation (24); Sleepers (34) are arranged in the spaces between the recesses (26) and between the recesses (26), and the second airbag (36) in a contracted state is placed on the sleepers (34). Inflate the second airbag (36) The third step of raising the storage tank (10), and after taking out the first airbag (18), arrange the sleepers (34) in the recesses (26), and then the sleepers (34).
A fourth step of placing the first airbag (18) in a contracted state thereon, inflating the first airbag (18) to raise the storage tank (10), and the second airbag. After taking out (36), a sleeper is further stacked on the sleeper (34) on which the second airbag (36) is mounted, and the contracted state of the first sleeper (34) is stacked on the sleeper (34). The second airbag (36) is placed on the second airbag
Inflating the airbag (36) of the storage tank (1
0) is raised, and the first airbag (18) is taken out and then the first air bag (18) is removed.
The sleeper (34) on which the airbag (18) of
The sleepers are stacked on top of each other (3
4) A sixth step of placing the first airbag (18) in a contracted state on the upper surface, inflating the first airbag (18) to raise the storage tank (10), and the fifth step. And a seventh step of repeating the step and the sixth step to raise the storage tank (10) to a desired height.