JPH1121926A - Structure for storing high-pressure fluid and constructing method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structure, cost of which can be reduced largely and which is used for storing a high-pressure fluid, and a constructing method thereof. SOLUTION: A pressure-resistant vessel 10, in which compressed air is stored and which is made of reinforced concrete, and a heavy slurry vessel 20, in which heavy slurry is stored on an outer circumference, are constructed on an existing submerged shaft 1 by a division execution and cast-in-place concret system, and immersed. Heavy slurry applies prestress onto the outer circumference of the pressure-resistant vessel 10, and the compressive stress of the vessel 10 is reinforced. Heavy slurry is supplied and discharged through a heavy slurry pipe 21 reaching the upper section of a ground, and the usage of heavy slurry is minimized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for storing a high-pressure fluid and a method for constructing the structure for storing a high-pressure fluid.
The present invention relates to a structure including a high-pressure fluid storage container such as a tank and a method for constructing such a structure.

[0002]

2. Description of the Related Art At present, a CAES system has been proposed as an effective use form of nighttime electric power.
The compressor is operated by relatively inexpensive nighttime power to store compressed air in a pressure-resistant container (CAES tank), and the compressed air is discharged during the day to rotate the turbine, thereby compensating for the rising power demand during the day. Is what you do.

[0003] In addition, concrete is a structural material excellent in economy and workability, but has low tensile strength.
Even if a reinforcing bar was inserted, it was considered unsuitable, but if heavy muddy water with a specific gravity of about 2.0 was stored around the reinforced concrete pressure vessel and prestress was introduced into the pressure vessel from outside by heavy mud pressure, It has been confirmed and verified that the circumferential stress of the pressure-resistant container is subjected to a compressive stress state, thereby enabling the reinforced concrete container to be safely used as a CAES tank. The above technology is disclosed in Japanese Patent Application Laid-Open No. 7-189273. Have been.

[0004]

SUMMARY OF THE INVENTION However, CAE
Excavating shafts and the like for installing S tanks is extremely costly, and when the shafts are filled with heavy muddy water, expensive heavy muddy water must be used more than necessary. Problems such as the need to take measures to prevent sludge loss to the mountain and the further rise in cost remain unsolved.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a high-pressure fluid storage structure and a method of constructing the high-pressure fluid storage structure which can largely reduce the cost.

[0006]

A high-pressure fluid storage structure according to the present invention is a structure for storing a high-pressure fluid installed in a submerged shaft, and comprises a reinforced concrete high-pressure fluid for containing the high-pressure fluid. And a heavy muddy water container for storing heavy muddy water that applies a prestress to the outer periphery of the high pressure fluid container to reinforce the compressive stress of the high pressure fluid container.

Here, the "submerged shaft" includes an existing one and a newly excavated one, but the former, specifically, is located in a closed coal mine or the like to prevent the collapse of the pit wall ground. It is desirable to use the one filled with water, and in this case, the construction cost and the like can be greatly reduced as compared with the case where a shaft is newly provided. It should be noted that, regardless of whether it is a vertical hole or a vertical hole, it is economical to construct such that a support work for preventing collapse of a pit wall by external water pressure becomes unnecessary.

As the high-pressure fluid, in addition to compressed air, LP
G, LNG, and the like.

The heavy muddy water is composed mainly of natural clay and barite (natural barite powder; specific gravity of 4.2 to 4.4), and a thickener and a dispersant are added thereto to obtain a specific gravity of 2.0. It is characterized by low material separation, excellent long-term stability as a fluid (liquid), and little influence of corrosion on the iron plate. By introducing prestress to the outer periphery of the high-pressure fluid container with such heavy muddy water, it is possible to safely design the high-pressure fluid container as a concrete structure under the condition of excellent compressive stress of external pressure. it can.

Further, by storing heavy muddy water in a dedicated container, the amount of heavy muddy water can be easily increased and decreased, and the amount of heavy muddy water used can be suppressed to the minimum necessary. There is no need to take any measures. A flexible sheet is installed in the high pressure fluid container instead of the heavy mud container as a means to prevent heavy mud water from getting lost to the shaft wall, and heavy mud is put between the sheet and the high pressure fluid container. It is also possible to make it adhere to a wall. However, in this method, the risk of breakage of the sheet is great, and the amount of heavy muddy water used is large.

A method for constructing a structure for storing a high-pressure fluid according to the present invention is a method for constructing the above-mentioned structure, wherein the method for constructing a structure for storing a high-pressure fluid according to claim 1 is provided. The high-pressure fluid container and the heavy muddy water container are divided on the submerged shaft from the lower part to the upper part at predetermined divisions, and each of the high-pressure fluid containers is divided into inner molds and outer molds. It is characterized by cast-in-place concrete in the air between formwork.

That is, inner and outer molds, heavy muddy water container frame materials, reinforced cages and the like for each divided part are produced in a factory, and the high pressure fluid structures and After constructing a container for heavy muddy water, it will be submerged in a submerged shaft.

In the present invention, at least one of the inner mold frame and the outer mold frame can carry the airtightness of the high-pressure fluid container.

[0014]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is an explanatory view for convenience showing a cross section of a high-pressure fluid storage structure submerged in an existing submerged shaft 1 at a depth of about 200 m. The structure is a compressed high-pressure fluid container. A pressure-resistant container (CASE tank) 10 made of reinforced concrete for storing air and a heavy muddy water container 20 made of steel plate for storing heavy muddy water (specific gravity 2.0) around the outer periphery of the pressure-resistant container 10. The heavy mud gives a pre-stress to the outer periphery of the pressure vessel 10 to put the circumferential stress of the pressure vessel 10 under a compressive stress state, thereby reinforcing the compressive stress generated in the pressure vessel 10. Table 1 shows a composition table of heavy muddy water.

[0016]

[Table 1]

The inner peripheral surface and the outer peripheral surface of the pressure-resistant container 10 are provided with an inner mold 11 and an outer mold 12 made of a steel plate, which are used for the container body as discarded molds that are left behind during concrete casting, which will be described later. By making the inner mold 11 have an airtight structure, leakage of gas from the pressure-resistant container 10 is reliably prevented.

The pressure vessel 10 has a compressor 2 on the ground.
An air supply pipe 13 communicating with the air supply pipe 13 is connected, and the CASE operation of one cycle per day, that is, the compressed air is transferred to and from the pressure-resistant container 10 via the air supply pipe 13. The pressure vessel 10 also communicates with the pressure compensation water tank 3 on the ground,
A water pipe 14 for sending and discharging pressure-compensated water according to the amount of compressed air stored in the container 10 and a measurement pipe 15 for measuring the internal pressure, the stress level, and the like of the container 10 are connected. Reference numeral 4 represents a safety valve, 5 represents a valve, and 6 and 7 represent expansion joints, respectively.

A heavy muddy water pipe 21 whose upper end reaches the ground is connected to the top of the heavy muddy water container 20, through which heavy muddy water is supplied and discharged.

The above pressure-resistant container 10 and heavy muddy water container 20 have a diameter of 5 m and a total length of about 25 m.
7 divisions from the lot to the 7th lot at the top
The split construction and cast-in-place concrete methods described below were adopted. In addition, the inner formwork, outer formwork for each lot,
The frame material used as a reinforced basket and a heavy mud container (hereinafter, "heavy mud form") is manufactured in advance at a factory.

Construction of the first lot (see FIG. 2) First, the inner mold 11a, the outer mold 12a, the reinforcing cage and the heavy muddy water form 20a of the first lot are built on the submerged shaft 1 by a truck crane. , Inner and outer molds 11a, 12a
The first lot of concrete 10 by a pump truck in between
a was cast in the air. The inner and outer forms 11a and 12a and the heavy muddy water form 20a each have a bottom cover integrally provided. In addition, as for the temporary holder, a bracket 31 for both hanging and receiving, which is attached to the outer peripheral surface of the heavy muddy water form 20a, is installed at the shaft shaft.
The test was carried out by placing it on a steel gantry 32 (the same applies hereinafter).

Construction of Second Lot (See FIGS. 3 and 4) Next, the inner and outer molds 11b and 12b of the second lot are sequentially butted over the inner and outer molds 11a and 12a and joined by welding. Concrete 10b for two lots was cast, and then heavy mud form 20b for the second lot was butt-welded onto heavy mud form 20a. In addition, since the inner and outer molds were thin, a backing material was welded in advance, and the butt welding was performed together with the backing material. Moreover, each suspension wire was removed using the temporary scaffold 53 having a height of about 4 m.

Construction of the third to sixth lots (see FIG. 5) The third to sixth lots were constructed according to the construction of the second lot.
In addition, the water pipes 14a corresponding to the second lot to the sixth lot,
14b to 14f were successively added while being fixed by the steady rest 54.

Construction of the seventh lot (see FIG. 6) An air supply pipe 13, a measurement pipe 15 and a water supply pipe 14g corresponding to the seventh lot are attached, and the inner lot 11f (see FIG. 5) is used. After joining the molds 11g, the upper part of the inner mold 11 is closed with an inner upper lid 11 '.
The gaps between 3, 15, and 14 g and the inner upper lid 11 ′ were sealed by welding.

Next, after bonding the outer frame 12g of the seventh lot to the outer frame 12f (see FIG. 5), concrete 10g of the seventh lot is poured. The tubes 13, 15, 14 are closed by the upper lid 12 ′.
g and the outer top lid 12 'were sealed by welding, and cement milk was injected and filled into the gap between the concrete upper surface and the outer top lid 12' through the cement milk injection port 55.

Then, after joining the heavy mud mold 20g of the seventh lot to the heavy mud mold 20f (see FIG. 5), the heavy mud pipe 2
The upper lid 20 ′ having a part of the tube 1 integrally with each of the tubes 13,
15 and 14 g are passed through and attached, and each tube 13 and 14
g, 15 were sealed by welding.

A concrete release agent is applied to the concrete casting surfaces of the inner and outer forms 11, 12 and the like in order to remove the influence of the concrete surface restraint by the steel plate. Good ones were selected and after compaction, they were carefully compacted with a vibrator.

The above-mentioned hermetic structure is provided particularly by securely performing seal welding and the like at the joint between the inner mold frame 11 and the inner upper lid 11 '.

After the above steps are completed, the structure (pressure vessel 10 and heavy muddy water container 20) is suspended by the suspending jig 60 via the suspended steel rod 61, and the submerged shaft 1
Are sequentially descended and laid down to a depth of 200 m. At this time, the air supply pipe 13, the water supply pipe 14, the measurement pipe 15, and the heavy muddy water pipe 21 are added while preventing buckling and preventing steadying, and the hanging steel rod 61 is also added while interposing the fixing nut and the coupler. In addition, since the structure easily rotates in terms of structure, a high-strength PC steel rod (61) was used without using a wire as a suspending member. Further, since there is a possibility that the structure may come into contact with the shaft wall, a rubber-made stringing member 22 (see FIG. 1) is provided on the outer peripheral surface of the heavy muddy water container 20.

[0030]

As described above, in the high-pressure fluid structure and the method for constructing a high-pressure fluid structure according to the present invention, a container dedicated to heavy mud is provided on the outer periphery of the high-pressure fluid container. As a result, the amount of heavy muddy water used can be kept to a minimum as compared with the case where it is stored directly in a shaft,
In addition, there is no need to take measures to prevent sludge from flowing into the ground of heavy muddy water, and the cost can be reduced accordingly, and the construction cost can be further reduced by using the existing submerged shaft. it can. Furthermore, the level of heavy muddy water in the container for heavy muddy water can be adjusted, and the strength of compressive stress applied to the container for high pressure fluid can be easily adjusted.

[Brief description of the drawings]

FIG. 1 is an explanatory view for convenience showing a cross section of a high-pressure fluid storage structure according to the present invention.

FIG. 2 is an explanatory diagram showing a state in which a first lot has been constructed.

FIG. 3 is an explanatory diagram showing a state in which a second lot of inner molds are matched with a first lot.

FIG. 4 is an explanatory diagram showing a state in which a second lot has been constructed.

FIG. 5 is an explanatory diagram showing a state in which a sixth lot has been constructed.

FIG. 6 is an explanatory diagram showing a state where a pressure-resistant container and a heavy muddy water container are laid down.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Submerged shaft 2 Compressor 3 Pressure compensation water tank 10 Pressure-resistant container (CASE tank) 11, 11a, 11b, 11f, 11g Inner form 11 'Inner lid 13 Air supply pipe 12, 12a, 12b, 12f, 12g Outer form 14, 14a, 14b, 14f, 14g Water pipe 15 Measurement pipe 20 Heavy mud container 20 'Top lid 21 Heavy mud pipe

 ──────────────────────────────────────────────────続 き Continued on the front page (71) Applicant 591052239 Engineering Promotion Association 1-4-6 Nishi-Shimbashi, Minato-ku, Tokyo CYD Building (71) Applicant 000125369 Tokai University 2-28 Tomigaya, Shibuya-ku, Tokyo No. 4 (71) Applicant 000222668 Toyo Construction Co., Ltd. 4-1-1 Koraibashi, Chuo-ku, Osaka-shi, Osaka (71) Applicant 000183325 Sumitomo Construction Co., Ltd. 13-4 Arakicho, Shinjuku-ku, Tokyo (71) Application Person 391058657 Tone Underground Technology Co., Ltd. 2-16-2 Minami Kamata, Ota-ku, Tokyo (71) Applicant 000210908 Central Development Co., Ltd. 3- 13-5 Nishi-Waseda, Shinjuku-ku, Tokyo (72) Inventor Hidetoshi Seichi Tokyo (72) Inventor Masaki 3-3-1 Minatomirai, Nishi-ku, Yokohama-shi Mitsubishi Kakoki Co., Ltd. (72) Inventor Yukio Yamashita 4-640 Shimoseito, Kiyose-shi, Tokyo Obayashi Corporation Technical Research Institute Co., Ltd. (72) Inventor Masao Hayashi 131-7 Wakamatsu, Abiko-shi, Chiba

Claims (3)

[Claims] 1. A structure for storing a high-pressure fluid installed in a submerged shaft, comprising: a high-pressure fluid container made of reinforced concrete for storing the high-pressure fluid; and a prestress applied to an outer periphery of the high-pressure fluid container. And a container for heavy mud that accommodates heavy mud that reinforces the compressive stress of the high pressure fluid container. 2. The method for constructing a high pressure fluid storage structure according to claim 1, wherein the high pressure fluid container and the heavy muddy water container are submerged in a predetermined division from a lower part to an upper part. Of the high-pressure fluid storage structure, characterized in that each of the high-pressure fluid containers is subjected to split-in-place construction, and that each split-operation of the high-pressure fluid container is cast-in-place concrete in the air between an inner mold and an outer mold that are left unattended. Construction method. 3. The method for constructing a high-pressure fluid storage structure according to claim 2, wherein at least one of the inner mold frame and the outer mold frame holds the airtightness of the high-pressure fluid container.