JP3407026B2 - Segment for shield method for underground tank construction and underground tank for storage of LNG etc. - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shield construction method for constructing an underground tank used for constructing an underground tank for storing liquefied natural gas (hereinafter abbreviated as LNG) in a tunnel shape by the shield construction method. Segment of
The present invention relates to an underground tank for storage such as LNG constructed using the same segment.

[0002]

2. Description of the Related Art The demand for LNG as a clean energy source is increasing, but the storage of LNG is currently dominated by a cylindrical underground tank. However, in the suburbs of large cities, the number of places satisfying the location conditions suitable for LNG bases is gradually decreasing, and as one of the countermeasures, the underground part of the existing storage base for the cylindrical underground tanks (large It is considered that a completely underground type underground tank utilizing depth) is effective. That is, as schematically shown in FIG. 4, a tunnel type cavity is constructed in the lower portion (large depth) of the existing underground tank 8 constructed by suppressing the surrounding earth pressure by the underground connecting walls 9, 9. Has been proposed as an underground tank 7 for storing LNG or the like.

[0003] By the way, in underground storage tanks such as LNG currently in practical use, corrugation is used as a means for ensuring structural stability, particularly airtightness, in response to a large temperature change due to a storage substance such as LNG. It is common practice to use membranes that have them. This situation is the same when the above-mentioned completely underground type underground tank 7 is used in the future.

[0004]

In the case of a completely underground type underground tank, the diameter of the tank is limited (about 15
In order to secure the same capacity as the underground tanks that are currently in practical use, the surface area of the tank will inevitably become large, so the cost required for the membrane will be reduced to reduce the construction cost. Reduction is an important issue. However, the processing cost of corrugation that absorbs heat shrinkage and thermal expansion is high, and the cost of the membrane is inevitably soaring in existing underground tanks where corrugation is indispensable. Has been done.

Therefore, an object of the present invention is to use a shield construction method for constructing an underground tank which can be economically constructed by eliminating the need for corrugation, which requires a high processing cost, and reducing the cost required for a membrane, especially the construction cost of an underground tank. It is to provide underground tanks for storage of segments and LNG.

[0006]

As means for solving the above-mentioned problems, a segment for a shield construction method for constructing an underground tank according to the invention described in claim 1 is in the segment for shield tunneling to be used for construction of underground tanks for storing liquefied natural gas or the like, the inner surface of the reinforced concrete skeleton 1, wherein the reinforcing bar co
The steel plates 3 and 3'joined to the reinforcing bars 2 of the core body 1
Standing in a cross shape (Fig. 2), the reinforced concrete frame 1
Joining the substantially central portion of the inner size of which covers the side surface metal membrane 4 of the cross-shaped steel plate 3 and 3 '(Fig. 1), the four corners of the membrane 4 is the reinforced concrete skeleton 1
Is supported on the heat insulating material 5 which is interposed (Figure 1, Figure 2), the outer peripheral portion of the membrane 4 is bonded to the outer periphery of the membrane 4 of the adjacent segments 6 (Figure between the inner surface of the 2A) underground tanks inside wall of the airtight property is formed, characterized in Rukoto.

The invention according to claim 2 is the same as that of claim 1.
Segment for shield construction method for building underground tank
In the iron plate 3 and 3 'of the reinforced concrete building frame 1
A cross shape is erected on the inner surface (Fig. 1), and the reinforcing bar concrete
The height h from the inner face of the preparative precursor 1, as shown in Figure 2A, the membrane the line p connecting the vertical steel plate 3, 3 at the upper end adjacent the two segments 6, 6 assembled in a circular 4 is not parallel, and the four corners of the membrane 4
Cleats building frame is held movable around a moderate distance m between the first inner side surface, the membrane 4 is, rebar concrete
DOO inner surface of the building frame 1 is the steel plate 3 and 3 'by to <br/> formed by split pieces 4 a of substantially the same size as the range is partitioned into a cross shape (Fig. 1), the corresponding of the split pieces 4a Do the above two sides
It is formed by joining the upper edge of the cross-shaped iron plate 3 and 3 '
And said that you are.

The underground tank for storing LNG etc. according to claim 3 is a shield construction method as shown in the embodiment in FIG.
Stores liquefied natural gas, etc. constructed using a segment for
In the underground tank to be stored, the segment 6 is a rebar
It is formed mainly of the concrete frame 1 and its inner surface side
The iron joined to the rebar 2 of the reinforced concrete frame 1
The plates 3 and 3'are erected in a cross shape, and the reinforcing bar concrete
A metal membrane 4 sized to cover the inner surface of the frame 1
The substantially central part of the is joined to the cross-shaped iron plates 3 and 3 ',
The four corners of the membrane 4 are the reinforced concrete frame
1 is supported by a heat insulating material 5 that is interposed between the inner surface and the inner surface of 1.
Ri, the outer peripheral edge portion of the membrane 4 of the segment 6, the earth
Assembled in order to construct the lower tank, characterized in that joined to the outer periphery airtightly tank inner wall of the membrane 4 of the adjacent segments 6 are formed.

[0009]

The height h of the action] iron 3, the line p connecting the vertical steel plate 3, 3 at the upper end adjacent the two cell <br/> segment 6, 6 is assembled into a circular shape the membrane 4 is nonparallel , And membrane 4
Between the four corners of the membrane and the inner surface of the reinforced concrete skeleton 1 so that an appropriate space m can be maintained.
Insulation adhered to the inner surface of the reinforced concrete frame 1 at the corners
Since merely in contact with the timber 5 (FIG. 2A), in the outer peripheral portion of the adjacent membrane 4 by hermetically joined,
The membrane 4 after storage for LNG etc. to thermal contraction, also follow freely and deformation to the position shown by the broken line in FIG. 3, particularly junction s of the membrane 4 without breaking or the like, hermetically The property (liquid tightness) can be maintained. When the membrane 4 is thermally expanded is reversed, allowing the deformation to compress the insulation material 5 of the four corner portions (2, 3), and junction of holding the interval m <br/> membrane 4 s is in the reinforced concrete frame 1
Even in this case, the membrane 4 does not come into contact with the surface.
The joint s of 1 never breaks and the airtight state can be reliably maintained.

[0010]

EXAMPLE An example of the invention of the segment for the shield construction method for constructing the underground tank shown in the figure is shown below. Figure 1
Shows an enlarged view of a single segment assembled as shown in FIG. The segment 6 is used in a mechanized shield construction method applied to the construction of an underground tank 7 (see FIG. 4) that stores LNG and the like.

[0011] The segment 6, reinforced concrete building frame 1 around thick Saga about 60cm is mainly, the rebar co
Those on the inner surface of Nkurito skeleton 1 configuration with integrated membrane 4 or the like, which are manufactured in advance factory. The inner surface of the reinforced concrete skeleton 1, viewed from the inner face steel plate 3 and 3 'are erected on vertical and horizontal cross-shaped, its lower end is fixed by bonding with rebar 2 of the reinforced concrete skeleton 1 (Figure 2). The height h from the inner surface of the reinforced concrete skeleton 1 to the upper end of the iron plate 3 is assembled in a circle as shown in FIG.
And to a line connecting the upper ends of the vertical steel plates 3,3 two adjacent segments 6, 6 stood p (FIG. 2A), the membrane 4 is a non-parallel, and the four corners of the membrane 4 <br /> and is held movable around a moderate distance m between the inner side surface of the reinforced concrete building frame 1, of the steel plate 3 and 3 '
The overall height is slanted. In the case of this embodiment, the height h of the iron plate 3 in the vertical direction is about 20 cm, and the interval m is about 10 cm. When junction s the membrane 4 adjacent accordance membrane 4 due to thermal expansion or the like is deformed is displaced, the junction s is reinforced concrete building frame 1
Of it in order not to contact with the inner side surface, the height h and the interval m within the range of the conditions is freely Kesse. Therefore,
Although illustration is omitted, for example, the position of the membrane 4 may be arranged at the opposite symmetrical position with respect to the line p to join them.

At the upper edges of the cross-shaped iron plates 3 and 3 ' ,
Stainless steel plate (SUS) to maintain the airtightness of the tank
304) and other membranes 4 (thickness of about several millimeters) are bonded to each other at a substantially central portion. Membrane 4, specifically, prior Symbol Cross-shaped iron plate 3, 3 'by reinforcement concrete
Substantially the same size as the range of the inner surface side bets skeleton 1 is partitioned pressurized
Engineering was has four divided pieces 4a ... the thus formed consisting of a flat plate, the four divided pieces 4a ... is united, necessary and sufficient to cover the inner side surface of the reinforced concrete skeleton 1 as a whole shape It is formed on the membrane 4 of various sizes . Corresponding two sides of each of the divided pieces 4a are formed along the inclined upper edges of the cross-shaped iron plates 3 , 3 '.
Is joined to the upper edge of. On the other hand, as described above,
The four corners (corner portions) of the formed membrane 4 are the above-mentioned iron
It is supported by a heat insulating material 5 such as polyurethane foam interposed between the inner surface of the reinforced concrete frame 1. That is, the heat insulating material 5 is fixed by adhesive to the corners of the inner surface of the reinforced concrete skeleton 1 (four corners), Menbure
The four corners of the connector 4 and the heat insulating material 5 are not fixed to each other but are simply in contact with each other. Therefore, even if the membrane 4 thermally shrinks in the center direction of the segment 6 (see FIG. 3) due to storage of LNG or the like, the membrane 4 sufficiently follows and withstands, and even if it deforms in the outward direction of the segment 6 during thermal expansion, it is thermally insulated. Due to the deformation of the material 5, the deformation of the membrane 4 is appropriately absorbed .

Therefore, the segment 6 ...
Assembled as shown in FIG. 3, the underground tank 7 (diameter is about 10
After building a m), the outer periphery of the membrane 4, the inner wall of the adjacent air-tightness by joining with the outer periphery of the membrane 4 such as welding (liquid-tightness) underground tank 7 is held <br /> is you complete. That is, in normal times, the membrane 4 is bonded to the adjacent membrane 4 with a margin, so even when a low-temperature storage substance such as LNG is put in the underground tank, the membrane 4 is broken by the broken line in FIG. no unreasonable deformation thermally contracts as shown in the adjacent membrane 4,4
The airtight state in the tank is maintained without any mutual breakage. On the contrary, when the contracted and deformed membrane 4 thermally expands, the four corners of the membrane 4 are supported.
The reasonable deformation by the deformation of the heat insulating material 5 for lifting (Fig. 2), the membrane 4,4 mutual junction s is reinforced concrete
Since no contact to the inner surface of the over preparative skeleton 1, the joint s of the membrane 4 also in this case not be broken or the like,
The airtight state is always maintained.

[0014] Incidentally, only by changing the cross-shaped iron plate 3, 3 'of the height and the membrane 4 size, etc., substances stored in underground tanks 7, the LNG (storage temperature -162
It is not limited to hot water (storage temperature is room temperature to 100 ° C.) and high temperature water (storage temperature is 100 ° C. or higher).
Further, the membrane 4 and becomes with the presence of the air gap between the inner surface <br/> of reinforced concrete building frame 1, wherein the insulating effect against the surrounding ground of an underground tank 7 by circulating air It is also possible to utilize the cold heat of the air having a lowered temperature. Further, although the LNG demand amount varies with time and day, it is also possible to circulate high-temperature air to generate so-called boil-off gas when the demand amount is large, and use this.

[0015]

[Effects of the Invention] According to the segment for the shield construction method for constructing an underground tank and the underground tank for storing LNG and the like using the segment according to the present invention, corrugation with high processing cost is not required at all and airtightness is achieved. The cost of constructing an underground tank is reduced, and this contributes to the economical construction of an underground tank. In addition, since this segment is integrally manufactured at the factory, it contributes to the improvement of work efficiency in the field of the shield construction method.

[Brief description of drawings]

FIG. 1 is a perspective view of a segment according to the present invention.

2 is a sectional view taken along the line II of FIG. 1, and B is II of FIG.
It is a sectional view taken along the line II.

FIG. 3 is an overall view showing a state where segments are assembled.

FIG. 4 is a sectional view showing an underground tank.

[Explanation of symbols]

1 concrete 2 rebar 3 iron plate 4 membrane 4a divided piece 5 insulation 6 segments 7 underground tank

─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Takao Ueda 2-5-14 Minamisuna, Koto-ku, Tokyo Inside Takenaka Corporation Technical Research Institute (72) Inventor Hiroshi Iwamoto 2-5-14 Minamisuna, Koto-ku, Tokyo No. Stock Company Takenaka Corp. Technical Research Institute (72) Inventor Yuichi Komura 2-5-14 Minamisuna, Koto-ku, Tokyo Stock Company Takenaka Corp. Technical Research Institute (72) Yoshifumi Fujii 8-chome, Ginza 21-chome, Chuo-ku, Tokyo No. 1 Takenaka Civil Engineering Co., Ltd. (56) References JP 54-2506 (JP, A) JP 5-33899 (JP, A) Actual development 62-184299 (JP, U) (58) Survey Fields (Int.Cl. ⁷ , DB name) E21D 11/08 F17C 3/04 B65D 87/36

Claims (3)

(57) [Claims] 1. A segment for a shield construction method used for constructing an underground tank for storing liquefied natural gas or the like, wherein the reinforcing bar concrete is provided on the inner surface side of a reinforced concrete frame.
Iron plate joined to reinforcing bars of the bets precursor is erected in a cross shape, a substantially central portion of the reinforced concrete skeleton size of the metal membrane that covers the inner side surface of the is joined to said cross-shaped iron plate, of the membrane four corners is supported in the heat-insulating material is interposed between the inner surface of the reinforced concrete skeleton <br/> body, the outer periphery of the membrane, bonded to the outer periphery of the membrane of the adjacent segments Airtight underground tank
A segment for the shield construction method for constructing an underground tank, which is characterized by the formation of an inner wall . Wherein the iron plate is erected on the tens <br/> shape to the inner surface of the reinforced concrete skeleton, or the inner surface of the reinforced concrete skeleton
The height of the al is a membrane in the line connecting the upper ends of the vertical steel plate two adjacent segments assembled into a circular non-parallel, and the inner side surface of the four corners and reinforced concrete skeleton <br/> of the membrane It is formed so as to be able to maintain an appropriate space between the membrane and the membrane , and the inner surface of the reinforced concrete is formed by a division piece of approximately the same size as the range partitioned in a cross shape by the iron plate, and the division Applicable
Characterized in that the two sides are formed by joining the upper edge of the cross-shaped iron plate, segment for shield tunneling for underground tanks constructed as set forth in claim 1. 3. A underground tanks for storing liquefied natural gas is constructed using the segments for shield tunneling and the like, wherein the segments are <br/> formed reinforced concrete skeleton mainly, the reinforced concrete building frame on its inner surface iron plate joined to the reinforcing bar is erected in a cross shape, the reinforcing bar con
Substantially central portion of the size of the metal membrane that covers the inner side surface of the cleat precursor is joined to said cross-shaped iron plate, the heat insulating material in which four corners of the membrane is interposed between the inner surface of the reinforced concrete skeleton It is supported on the outer peripheral portion of the membrane of the segments to construct the underground tanks
So assembled in, characterized in that the outer <br/> is joined to the periphery airtight tank inner wall of the membrane of the adjacent segments are formed, underground tanks for LNG such storage.