JP2003314078A - Method and apparatus for closing construction hole in air-raising roof of storage tank - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and apparatus for closing a construction hole in air-raising the roof of a storage tank capable of reducing the cost of temporary construction work, constructing a liner plate after the air-raising of the roof, and reducing the period of construction work by using reinforcements that protrude from the construction hole toward its opening to facilitate the fixing of a closing plate while eliminating the need to embed temporary members into the peripheral edge of the inner surface of the construction hole. <P>SOLUTION: Pipes 14 are fitted over the reinforcements 13 which protrude from the construction hole 10 toward its opening. After a screwing coupler 15 is threadedly engaged for locking each pipe 14, a base member 16 formed of H-steel, I-steel or the like is securely welded to each pipe 14 and the closing plate 11 is welded to the base member 16 to close the inner face of the construction hole 10. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and a device for closing a construction opening when roofing air of a storage tank.

[0002]

2. Description of the Related Art Conventionally, as storage tanks such as LNG tanks,
A so-called metal double shell type storage tank, which is formed by forming a heat insulating layer between a metal inner tank and an outer tank, was used, but in the case of such a metal double shell type storage tank, by any chance, When the liquid stored in the inner tank leaks out, in order to prevent the liquid from leaking to the outside, install a liquid barrier that surrounds the entire circumference of the storage tank with a required distance from the outer tank. Therefore, the land was widely needed for that.

For this reason, in recent years, in order to effectively use the land, a storage tank of the type in which the liquid barrier also serves as the side plate of the outer tank has been developed.

FIG. 3 shows an example of a storage tank in which the liquid barrier is also used as a side plate of the outer tank. Reference numeral 1 is an outer tank, 2 is an inner tank, and the outer tank 1 is a bottom slab 3. The inner tub 2 is also formed of a liquid barrier 4 as a cylindrical side wall standing up from the peripheral edge of the bottom plate 3 and a roof 5, and the inner tank 2 is also a bottom plate 6 and a cylindrical side plate standing up from the peripheral edge of the bottom plate 6. 7 and the roof 8.

The liquid barrier 4 as a side wall of the outer tub 1 is made of prestressed concrete (PC: Prestress).
ed Concrete), the roof 5 is made of a metal material, and at the time of construction of the storage tank, after constructing the bottom plate 3 and the liquid barrier 4 of the outer tank 1, as shown in FIG.
The air-raising method is used to raise the roof 5 and the roof 8 assembled in the outer tub 1 by supplying air from the blower 9 into the space surrounded by the bottom slab 3 and the liquid barrier 4 and the roof 8. .

[0006] Here, a construction port 10 for carrying in materials is opened at the bottom of the liquid barrier 4, and air leaks to the outside when the roof 5 and the roof 8 are air-laid. In order to avoid it, it is necessary to close the inner surface side of the construction mouth 10, but since the metal closing plate 11 cannot be directly welded and attached to concrete, in the conventional case,
As shown in FIGS. 4 and 5, a temporary member 12 made of a strip-shaped metal plate is embedded in advance in a frame shape at the inner peripheral edge portion of the construction mouth 10, and the closing plate 11 is temporarily attached to the temporary member 12. The construction opening 10 was closed by welding and fixing, and the roof 5 and the roof 8 were air-laid.

After the roofing of the roof 5 and the roof 8 is finished, the closing plate 11 is removed and the temporary member 12 is buried.

Further, in FIG. 4, reference numeral 13 denotes a reinforcing bar projecting from the construction opening 10 to the opening side thereof, and when finally the construction opening 10 is completely closed with concrete, a screw-in coupler ( (Not shown) is used to assemble another reinforcing bar.

[0009]

However, as described above, the belt-shaped temporary member 12 is provided on the inner peripheral edge of the construction mouth 10.
If the temporary member 12 is embedded in advance, not only the extra cost of the temporary member 12 is required, but also the cost of the temporary member 12 and other rebars at the time of embedding the temporary member 12 are very difficult and troublesome. The total temporary construction cost is significantly increased, and it is necessary to make a plan for embedding the temporary member 12 early before the construction of the liquid barrier 4.

On the other hand, a liner plate for sealing is provided on the inner peripheral surface of the liquid barrier 4 as the side wall of the outer tank 1 so as to prevent the liquid from seeping in when the liquid leaks from the inner tank 2. Since (not shown) is installed, the liner plate may be installed before the roof 5 and the roof 8 are air-laid, and the closing plate 11 may be temporarily welded to the liner plate. However, in this method, it is indispensable to construct the liner plate before air-raising the roof 5 and the roof 8, so that it has a great influence on all the steps of the tank construction, which hinders shortening of the construction period. It became a factor and could not be said to be preferable.

In view of the above situation, the present invention makes it possible to easily fix the closing plate by using the reinforcing bar projecting from the construction mouth to the opening side, and to the inner peripheral edge of the construction mouth. It is an object of the present invention to provide a method and a device for closing a construction opening at the time of roof air laying of a storage tank, which can reduce temporary costs by eliminating the need to embed a temporary member, and can install a liner plate after air aging of the roof. It is a thing.

[0012]

SUMMARY OF THE INVENTION The present invention is a method for closing a construction opening at the time of roof air erasing of a storage tank having a concrete levee with a construction opening opened, which projects from the construction opening to the opening side. By fitting the pipe to the rebar to be fitted and screwing the threaded coupler for preventing the pipe from coming off, the base member is fixed to the pipe, and the closing plate is attached to the base member. The present invention relates to a method of closing a construction opening at the time of roof air aging of a storage tank, which is characterized in that the inner surface side of the construction opening is closed.

Further, the present invention relates to a construction port closing device for roof air aging of a storage tank having a concrete levee with a construction port opened, for a reinforcing bar projecting from the construction port to the opening side. Pipe, a threaded coupler screwed into the rebar to prevent the pipe from slipping off, a base member fixed to the pipe, and an inner surface side of the work opening is closed with respect to the base member. The present invention relates to a construction port closing device for roof air-raising of a storage tank, which is provided with a closing plate attached as described above.

According to the above means, the following effects can be obtained.

At the time of air aging of the roof, a pipe is fitted to the reinforcing bar projecting from the construction opening to the opening side, and a screw-in coupler for preventing the pipe from coming off is screwed, and then the pipe is fitted to the pipe. The base member is fixed, and the closing plate is attached to the base member.
The inner side of the construction mouth will be closed.

As a result, unlike the conventional case, it is not necessary to previously bury a strip-shaped temporary member in the inner peripheral edge portion of the construction mouth, which is very troublesome to engage with other reinforcing bars. As a result, the total temporary construction cost will be significantly reduced because it will not be troublesome, and it will not be necessary to make a plan for embedding the temporary member early before the construction of the liquid barrier.

On the other hand, regarding the construction of the liner plate for sealing on the inner peripheral surface of the liquid barrier as the side plate of the outer tank,
Since there is no need to perform it before the roof air laying, there is no concern that it will affect the entire process of tank construction, and the construction period can be shortened.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 and FIG. 2 show an example of a mode for carrying out the present invention. In the drawings, the parts denoted by the same reference numerals as those in FIGS. The pipe 14 is fitted to the reinforcing bar 13 projecting to the opening side, and the threaded coupler 15 for preventing the pipe 14 from coming off is screwed, and then the pipe 14 is made of H-shaped steel, I-shaped steel or the like. The base member 16 thus formed is welded and fixed to the base member 1.
The closing plate 11 is welded to and attached to the work 6, thereby closing the inner surface side of the construction mouth 10.

If necessary, as shown by phantom lines in FIG. 1, the auxiliary beam members 16 'are laid in a grid pattern on the base member 16 and divided into a plurality of plates instead of one plate. The closing plate 11 may be attached to the base member 16 and the auxiliary beam member 16 'by welding.

Next, the operation of the illustrated example will be described.

At the time of air aging of the roof 5 and the roof 8, the pipe 14 is fitted to the reinforcing bar 13 projecting from the construction mouth 10 to the opening side, and the screwed coupler 15 for preventing the pipe 14 from coming off is attached. After being screwed, the base member 16 is welded and fixed to the pipe 14, and the closing plate 11 is welded and attached to the base member 16, whereby the inner surface side of the work opening 10 is closed. Be in shape.

As a result, unlike the prior art, the strip-shaped temporary member 12, which had been troublesome to engage with other rebars and the like, had to be embedded in the peripheral portion on the inner surface side of the construction mouth 10 in advance. Since it is completed, the total temporary construction cost is significantly reduced, and it is not necessary to make a plan for embedding the temporary member 12 early before the liquid barrier 4 is constructed.

On the other hand, regarding the construction of the sealing liner plate on the inner peripheral surface of the liquid barrier 4 as the side plate of the outer tank 1, it is not necessary to perform it before the roof 5 and the roof 8 are air-laid, so that the construction of the storage tank is not required. There is no need to worry about affecting all processes, and it is possible to shorten the construction period.

It should be noted that the reinforcing bar 13 projecting from the construction opening 10 toward the opening side is not to be scratched because another reinforcing bar will be assembled when the construction opening 10 is completely closed with concrete. There is, but the rebar 13 is the pipe 1
Since the base member 16 is protected by No. 4, there is no risk of scratches or the like even if the base member 16 is fixed by welding. Also, roof 5 and roof 8
After the air erasing is completed, the closing plate 11, the base member 16, the threaded coupler 15 and the pipe 14 are sequentially removed.

By using the reinforcing bars 13 projecting from the construction mouth 10 to the opening side in this way, the closing plate 11 can be easily fixed, and the temporary member 12 is attached to the inner peripheral edge of the construction mouth 10. It is possible to reduce the temporary cost by eliminating the need for embedding, and it is possible to construct the liner plate after air aging of the roof 5 and the roof 8, leading to a shortened construction period.

It should be noted that the method and apparatus for closing the construction opening at the time of roof air aging of the storage tank of the present invention is not limited to the above illustrated examples, and various modifications may be made without departing from the scope of the present invention. Of course you can get it.

[0028]

As described above, according to the method and apparatus for closing a construction opening at the time of roof air-raising of a storage tank according to the present invention, a closing plate is used by utilizing a reinforcing bar projecting from the construction opening toward the opening side. Can be easily fixed, it is not necessary to embed a temporary member on the inner peripheral edge of the construction mouth, temporary construction costs can be reduced, and a liner plate can be installed after roof air laying, leading to a shortened construction period. That is, the excellent effect can be achieved.

[Brief description of drawings]

FIG. 1 is an internal view of a construction port in an example of an embodiment of the present invention.

FIG. 2 is a view taken along the line II-II of FIG.

FIG. 3 is an overall cross-sectional view showing an example of a storage tank in which the liquid barrier is also used as a side plate of the outer tank.

FIG. 4 is a main-portion cross-sectional view showing a conventional example of a state in which a construction port is closed during roof air aging of a storage tank.

5 is a view taken along the line VV of FIG.

[Explanation of symbols]

1 outer tank 2 inner tank 3 bottom plate 4 levee 5 roof 10 construction mouth 11 Blocking board 13 Rebar 14 pipes 15 screwed coupler 16 Base member

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Kazuo Masumoto             3-2-16 Toyosu, Koto-ku, Tokyo Ishikawajima             Harima Heavy Industries Tokyo Engineering Co., Ltd.             In the center (72) Inventor Naoyuki Takanashi             3-2-16 Toyosu, Koto-ku, Tokyo Ishikawajima             Harima Heavy Industries Tokyo Engineering Co., Ltd.             In the center (72) Inventor Kenji Nakayama             3-2-16 Toyosu, Koto-ku, Tokyo Ishikawajima             Harima Heavy Industries Tokyo Engineering Co., Ltd.             In the center (72) Inventor Yasuhiro Shimamura             3-2-16 Toyosu, Koto-ku, Tokyo Ishikawajima             Harima Heavy Industries Tokyo Engineering Co., Ltd.             In the center (72) Inventor Hideaki Nakamura             3-2-16 Toyosu, Koto-ku, Tokyo Ishikawajima             Harima Heavy Industries Tokyo Engineering Co., Ltd.             In the center (72) Inventor Junichi Shimamura             4-1-2 Hirano-cho, Chuo-ku, Osaka-shi, Osaka Prefecture               Within Osaka Gas Co., Ltd. (72) Inventor Maki Yamashita             4-1-2 Hirano-cho, Chuo-ku, Osaka-shi, Osaka Prefecture               Within Osaka Gas Co., Ltd. F-term (reference) 2E174 AA01 BA05 CA04 CA41 DA18                 3E070 AA03 AB32 BH01 DA01 DA03                       JB01 QA04                 3E073 AA01 BA02

Claims (2)

[Claims] 1. A method for closing a construction opening at the time of roof air-raising of a tank having a concrete dike with an opening for construction, in which a pipe is fitted to a reinforcing bar projecting from the construction opening to the opening side. By mounting a threaded coupler for preventing the pipe from slipping off, the base member is fixed to the pipe, and the closing plate is attached to the base member.
A method for closing a construction opening at the time of roof air aging of a storage tank, characterized in that the inner surface side of the construction opening is closed. 2. A construction port closing device for roof air aging of a storage tank having a concrete dike with a construction port opened, the device being fitted to a reinforcing bar projecting from the construction port to the opening side. Pipe, a screw-in coupler screwed to the rebar to prevent the pipe from coming off, a base member fixed to the pipe, and attached to the base member so as to close the inner surface side of the work opening. A work mouth closing device for roof air leasing of a storage tank, which is provided with a closing plate.