JP3258503B2 - Underground tank - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an underground tank constructed underground for storing a liquefied gas such as liquefied natural gas or liquefied petroleum gas.

[0002]

2. Description of the Related Art An underground tank having a structure shown in FIGS. 6 to 8 has been put into practical use as a tank for storing a liquefied gas such as liquefied natural gas or liquefied petroleum gas. In this method, an underground continuous wall 1 is provided in a circular shape in a plan view, a ground inside is excavated, a slab 2 and a side wall 3 made of reinforced concrete are provided, and an upper part thereof is covered with a steel dome roof 4. Things. The underground tank having such a structure can withstand an external force such as earth pressure, groundwater pressure, seismic force and the like, an internal liquid pressure, a gas pressure, and the like by a strong reinforced concrete underground continuous wall 1, a bottom slab 2, and a side wall 3. As shown in FIG. 8, a heat insulating material 5 and a membrane 6 made of a stainless steel sheet are attached to the inside to ensure excellent heat insulating properties, liquid tightness, and air tightness, as well as ensuring strength. You can do it.

[0003] In the above-mentioned conventional underground tank,
A pumping pit 7 was provided outside the underground continuous wall 1 to lower the level of groundwater in the ground inside the underground continuous wall 1 (that is, the ground below the bottom slab 2), and was formed below the bottom slab 2. Groundwater is collected from the crushed stone layer 8 through the water collecting pipe 9 to the pumping pit 7 and drained by pumping.

[0004]

In the underground tank having the above-described structure, if the groundwater invading from the underground continuous wall 1 penetrates cracks and the like generated on the side wall 3 and reaches the inside of the tank. In some cases, the functions of the various facilities installed inside may be impaired. Therefore, as means for further improving the water stoppage of the tank, FIG.
As shown in the figure, a filter material 10 which is long in the vertical and horizontal directions between the underground continuous wall 1 and the side wall 3 is made to correspond to a location where water leakage occurs in the underground continuous wall 1 or a place where leakage is expected to occur.
It is conceived that the groundwater is drained through the filter material 10. However, even with such a structure, there has been a problem that sufficient water stopping properties cannot be obtained.

That is, if there is a reinforcing bar connecting the underground continuous wall 1 and the side wall 3, that is, a reinforcing bar extending in the radial direction of the tank, the reinforcing bar and the filter material 10 interfere with each other. There are naturally restrictions on where you do it. Therefore, the location of the water leakage
The filter material 10 functions as a drainage channel when the filter material 10 coincides with or is near the installation position, but when the filter material 10 is far from the installation position of the filter material 10, the filter material 10 It may not work. In addition, since the cross-sectional area of the filter material 10 is relatively small, if the filter material 10 is clogged, the portion does not function as a drainage channel, and the drainage performance of the filter material 10 as a whole may decrease. Can be Therefore, assuming these, it has been required to increase the water stopping performance of the underground tank more than before.

[0006] The present invention has been made in view of the above circumstances, and has as its object to provide an underground tank having a high water-stopping property.

[0007]

In order to achieve the above object, an underground tank according to the present invention comprises a reinforced concrete skeleton, and a waterproof membrane buried at the center in the thickness direction of the skeleton over the entire surface of the skeleton. On both sides of the waterproof membrane, the outer wall and the inner wall of the skeleton are partitioned by the waterproof membrane.
A number of gibes, each buried and integrated with those walls
Are arranged at a certain distance from each other, and
The outer wall portion and the inner wall portion projecting from the wall portion, respectively.
It is characterized in that a long slip stopper for transmitting a shear force between them is provided .

[0008]

In the underground tank according to the present invention, the waterproof film buried at the center in the thickness direction of the frame is provided over the entire surface of the frame, so that even if a defect occurs at any position of the outer wall portion, The waterproof membrane reliably prevents infiltration of groundwater into the inner wall. In addition, in this underground tank, the outer wall and the inner wall of the reinforced concrete structure are not directly in contact with each other and are divided by a waterproof membrane, but they are arranged on both sides of the waterproof membrane so as to be spaced apart by a certain dimension. Gibber stitches that are integrated with the outer and inner walls, respectively, firmly fix the outer and inner walls, and are provided between rows of dowels
The long slip stopper protruding from the outer wall portion and the inner wall portion transmits the shearing force between the outer wall portion and the inner wall portion.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An underground tank according to a first embodiment of the present invention will be described below with reference to FIGS. As shown in FIG. 1, the underground tank 11 of this embodiment is of a type having no underground continuous wall and a reinforced concrete frame 13 directly built in a ground 12. The basic structure is such that a waterproof film 14 is provided at the center in the thickness direction of a reinforced concrete frame 13, and the entire tank 11 is wrapped with the waterproof film 14. That is, the skeleton 13
Is divided into an inner wall portion 15 and an outer wall portion 16 that do not directly contact each other with the waterproof film 14 as a boundary, and the cross section thereof is
Has a laminated structure in which an outer wall portion 16, a waterproof film 14, and an inner wall portion 15 are sequentially provided from the outside.

The waterproof film 14 is made of a material having high rigidity such as an iron plate, for example, and as shown in FIG. , 17,... Are provided. Each of these dowels 17, 17,... Has a bent portion 17a that bends downward at the tip thereof, is disposed at a fixed distance from each other in the horizontal direction and the vertical direction, and is fixed to the waterproof film 14 by welding. ing. Are provided on both surfaces of the waterproof film 14, extending in the horizontal direction between the rows of the gibber streaks 17 arranged in the horizontal direction. The slip stopper 18 is formed, for example, by arranging an angle so that its corners protrude toward the outer wall 16 and the inner wall 15, respectively, and is fixed to the waterproof film 14 by welding.

When the underground tank 11 having the above configuration is constructed, the waterproof film 14 is disposed at the center of the installed formwork, and concrete is poured into the formwork, as shown in FIG. It is possible to construct a reinforced concrete frame 13 having a laminated structure including the outer wall portion 16, the waterproof film 14, and the inner wall portion 15.

This underground tank 11 is different from a conventional underground tank in which a filter material is provided on a limited part of the body, and the entire body 13 has a waterproof membrane embedded therein. 14 is wrapped around. Therefore, if it is assumed that a defect occurs in the outer wall portion 16 of the skeleton 13, no matter where the defect is located on the outer wall portion 16, groundwater that penetrates through the defect will be exposed to the inner wall portion 15, that is, the tank 11. Since it is reliably prevented from entering the inside, the water stoppage of the tank can be improved.

In the underground tank 11, as described above, the frame 13 is separated from the inner wall portion 15 by the waterproof film 14 as a boundary.
And the outer wall 16, but since the dowels 17 are fixed to both sides of the waterproof film 14, the outer wall 16 and the waterproof film 14 and the inner wall 15 are Since the waterproof membranes 14 are firmly integrated with each other, even when a large external force is applied, the outer wall 1
6. Separation of the waterproof film 14 and the inner wall 15 can be prevented. Further, since the slip stoppers 18 are fixed to both surfaces of the waterproof film 14, even when a shearing force acts on the frame 13 in the vertical direction (the direction of arrow A in FIG. 3), the outer wall 16 and the inner wall 15 Shear force is transmitted between
The displacement of the skeleton 13 at the portion of the waterproof film 14 can be prevented. Therefore, the reliability of the strength of the frame 13 can be sufficiently ensured by these.

Hereinafter, a second embodiment of the underground tank will be described with reference to FIGS. As shown in FIG. 4, the underground tank 22 of this embodiment is of a type in which an underground continuous wall 19 is provided in the ground 12 and a reinforced concrete frame 20 is built inside the underground continuous wall 19. The basic structure is the same as in the first embodiment, except that a waterproof film 21 is provided at the center in the thickness direction of a reinforced concrete skeleton 20, and the entire tank 22 is covered with the waterproof film 21. . That is, the section has a laminated structure in which the underground continuous wall 19, the outer wall portion 23 of the frame 20, the waterproof film 21, and the inner wall portion 24 are sequentially provided from the outside of the tank 22.

This embodiment is different from the first embodiment only in the structure relating to the joint between the underground continuous wall 19 and the frame 20. That is, the waterproof film 21 in the present embodiment is
As shown in FIG. 5, the dovetail 25 extending toward the underground continuous wall 19 has no bent portion at its tip, and extends linearly to be connected to the underground continuous wall 19. On the other hand, a mechanical joint 26 such as a sleeve joint is provided on the surface of the underground continuous wall 19 corresponding to the position of the dowel 25 of the waterproof film 21.
Are embedded in the mechanical joint 26, and a reinforcing bar 27 extending inside the underground continuous wall 19 whose tip is bent downward is provided.
Are joined. The distal end of the dowel 25 provided on the waterproof film 21 and the mechanical joint 26 embedded in the underground continuous wall 19 are joined by any means. Further, as in the first embodiment, slip-off preventing members 28 are provided on both surfaces of the waterproof film 21 between rows of the horizontal dowels 25, respectively.

When the underground tank 22 is constructed, the underground continuous wall 1 in which the reinforcing bar 27 and the mechanical joint 26 are embedded in advance is used.
9, after the surface is roughened, the waterproofing membrane 21 is arranged at a predetermined position, and the tip of each dowel 25 and the mechanical joint 26 of the underground continuous wall 19 are joined and installed. When concrete is poured into the inside, a frame 20 having a laminated structure including the underground continuous wall 19, the outer wall 23, the waterproof film 21, and the inner wall 24 as shown in FIG. 4 can be constructed.

In the underground tank 22 of the present embodiment, as in the first embodiment, the entire structure of the skeleton 20 is wrapped by the waterproof film 21. Can reliably be prevented from entering the inside of the device.

In the underground tank 22, the reinforcing bar 27 and the dowel bar 25 are joined at the interface between the underground continuous wall 19 and the outer wall portion 23 by the mechanical joint 26, and the surface of the underground continuous wall 19 is roughened. Is performed, the adhesion between the underground continuous wall 19 and the outer wall portion 23 is ensured.
In addition, as in the first embodiment, the waterproof membrane 21 is provided with
The outer wall portion 2 is provided by providing the
3 and the inner wall portion 24 are firmly fixed, and their separation and displacement are prevented. Therefore, also in the present embodiment, it is possible to sufficiently secure the reliability of the strength of the frame 20.

In both of the above embodiments, the waterproof films 14 and 21 are made of, for example, an iron plate. However, the present invention is not limited to this. For example, stainless steel, glass fiber, or the like having high rigidity and capable of securing a resistance to shearing force is used. May be used. In addition, the gibber 17, 25 and the slip stopper 1
Regarding the shapes and arrangements of 8, 28,
Are arranged at a certain distance from each other, and a long
As long as the reinforcing members 18 and 28 are provided so as to extend continuously.
Therefore, it can be appropriately changed. However, the waterproof membranes 14, 2
As means for fixing the dowels 17 and 25 and the slip stoppers 18 and 28 to 1, there is no gap between the members. It is desirable.

[0020]

As described above in detail, the underground tank of the present invention is provided with a waterproof film buried at the center in the thickness direction over the entire surface of the frame, so that the underground tank can be temporarily attached to any of the outer walls of the frame. Even if there is a defect in the location, the waterproof membrane reliably prevents infiltration of groundwater into the inner wall, and stops compared to a conventional underground tank where a filter material is provided on a limited part of the body. Aqueous properties can be improved.
Also, a number of dowels are placed on the waterproof membrane with a certain distance between them.
The outer wall and the inner wall are firmly fixed and the separation and displacement between them are prevented by providing long slip stoppers between the rows , ensuring sufficient reliability for the strength of the frame. can do.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing an underground tank according to a first embodiment of the present invention.

FIG. 2 is a perspective view showing a waterproof membrane of the underground tank.

FIG. 3 is an enlarged side sectional view of the skeleton of the underground tank.

FIG. 4 is a side sectional view showing an underground tank according to a second embodiment of the present invention.

FIG. 5 is an enlarged side sectional view of the underground tank body.

FIG. 6 is a side sectional view showing an example of an underground tank.

FIG. 7 is a plan view of the same.

FIG. 8 is a sectional view of an essential part of the same.

FIG. 9 is a side sectional view showing an example of an underground tank provided with a filter material.

[Explanation of symbols]

 11,22 Underground tank 13,20 Body 14,21 Waterproof membrane 15,24 Inner wall 16,23 Outer wall 17,25 Jibber 18,28 Slip stopper

Continuation of the front page (72) Inventor Makoto Miyanaga 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Corporation (56) References JP-A-64-39421 (JP, A) JP-A-61-102915 (JP, A) JP-A-1-203513 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) E04H 7/18 E02D 29/04 E02D 5/18

Claims (1)

(57) [Claims] [1 claim: a reinforced concrete skeleton is composed of a waterproof film embedded in the thickness direction central portion of the skeleton over the entire surface of the該躯body, on both sides of the waterproof membrane, the said skeleton
It is buried in the outer wall and the inner wall sectioned by the waterproof membrane, respectively.
Many dowels that are integrated with those walls by a certain distance.
The outer wall and the inner wall are arranged between the rows of the dowel muscles.
Protrudes into walls and transmits shear force between them
An underground tank provided with a long slip stopper .