JP3524172B2 - 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 for storing various liquefied gases and the like.

[0002]

2. Description of the Related Art In recent years, an underground tank has been used as a tank for storing low-temperature liquefied gas, which has the advantages of being resistant to earthquakes, fires, etc., and being easily exposed to the surrounding environment due to its small exposed portion to the outside. Has been. As shown in FIG.
This underground tank 1 is roughly composed of a cylindrical side wall 2, a bottom plate 3, and a dome roof 4 provided on the upper side of the side wall 2.

As the underground tank 1 of this type, as shown in FIG. 8, a plurality of prefabricated segments 7 are used for the side wall 2 for the purpose of simplifying the work at the site and shortening the construction period. What was there is known. And when constructing the underground tank 1 using this segment 7, first, a cylindrical underground continuous wall 5 is constructed in the ground, and the ground on the inner peripheral side of this underground continuous wall 5 is excavated, Next, the assembled reinforcing bars 6 are arranged along the inner peripheral surface of the underground continuous wall 5, and a plurality of segments 7 are connected by bolts and nuts or the like at intervals along the underground continuous wall 5. After being assembled, concrete K was placed between these segments 7 and the underground continuous wall 5. In FIG. 8, reference numerals 9 and 10 denote a cold insulation layer made of urethane foam and a membrane layer made of a thin plate made of stainless steel, which are sequentially arranged on the inner peripheral side of the wall body made of the segment 7.

[0004]

By the way, when the segments 7 are arranged along the inner peripheral surface of the underground continuous wall 5 at intervals, the segments 7 and the underground continuous wall 5 are connected by a separator. I was supporting, but like this,
When the segment 7 is connected to the underground continuous wall 5 by the separator, the separator is installed by the assembled rebar 6 arranged between the segment 7 and the underground continuous wall 5, particularly by the vertical rebar 6a constituting the assembled rebar 6. Sometimes became difficult. Therefore, in order to prevent the separators and the vertical reinforcing bars 6 from interfering with each other, it is necessary to shift the respective arrangement positions, which requires a great deal of labor and time, which leads to a longer construction period. There was a problem.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide an underground tank in which a segment can be supported very easily by a separator and construction work can be favorably carried out.

[0006]

In order to achieve the above object, an underground tank according to a first aspect of the present invention has a cylindrical continuous wall constructed in the ground and a space on the inner peripheral side of the continuous wall. From a plurality of segments that are assembled together to form a cylindrical wall body, reinforcing bars that are arranged between the segments and the continuous wall, and concrete that is cast between the segments and the continuous wall In the underground tank having a side wall, the segment and the continuous wall are connected by a separator attached at one end to the continuous wall and at the other end to an attachment portion of an attachment plate provided in the segment. The mounting plate is characterized in that a pair of the mounting portions are provided at intervals in the horizontal direction.

An underground tank according to a second aspect is the underground tank according to the first aspect, wherein the mounting portion is a hole formed in the mounting plate, and the other end of the separator is bent in an L shape. It is characterized in that it is engaged with the mounting plate by being inserted into the hole from above. The underground tank according to claim 3 is the same as in claim 1.
Alternatively, the underground tank according to claim 2 is characterized in that the interval between the attachment portions is made wider than at least the diameter of the reinforcing bar arranged in the vertical direction.

[0008]

According to the underground tank of the first aspect, a pair of mounting portions for mounting the other ends of the separators are provided on the mounting plate provided on the segment at intervals in the horizontal direction. Even if a part of the reinforcing bar is arranged in the vicinity of the attachment plate and the separator cannot be attached to the one attachment portion, the separator can be attached to the other attachment portion.

According to the underground tank of the second aspect, the separator is easily fixed to the segment by inserting and locking the other end of the separator from above into the mounting portion including the hole. According to the underground tank of the third aspect, the interval between the mounting portions is made wider than the diameter of the reinforcing bars arranged in the vertical direction, so that the reinforcing bars further obstruct the mounting of the separator to the mounting plate. Will be reduced.

[0010]

EXAMPLES Examples of the underground tank of the present invention will be described below with reference to the drawings. The same components and structures as those of the conventional technique are designated by the same reference numerals, and the description thereof will be omitted. 1 to 3, reference numeral 11 is a mounting plate integrally provided on the segment 7. The mounting plate 11 has a pair of mounting hole portions (mounting portions) 12 formed in the horizontal direction with a space wider than at least the diameter of the vertical reinforcing bar 6a.
a and 12b, and these mounting holes 12
The other end of the separator 13 whose one end is fixed to the underground continuous wall 5 is attached to either one of a and 12b.

The separator 13 is provided with a turnbuckle 14 in the middle thereof.
The length can be adjusted by rotating the. One end of this separator 13 is
For example, it is fixed to the underground continuous wall 5 by being fastened to a fork anchor or the like driven into the wall surface of the underground continuous wall 5. The other end of the separator 13 is bent into an L shape, and the bent other end is attached to the mounting plate 1.
One of the mounting holes 12a and 12b is inserted from above to be locked.

In FIG. 3, reference numeral 15 is a dowel reinforcement for increasing the bonding strength with the concrete K to be laid, reference numeral 16 is a reinforcing bar arranged in the segment 7, reference numeral 17 is a wall made of the segment 7. Is an anchor formed for fastening the cold insulation layer 9 on the inner surface side of the.

According to the underground tank 1 using the segment 7 provided with the mounting plate 11 as described above, the assembly rebar 6 is arranged on the inner peripheral side of the underground wall 5 and the assembly rebar 6 is further installed. When arranging the segments 7 on the inner peripheral side of the underground continuous wall 5 with a space therebetween, the underground continuous wall 5 and the segment 7 can be connected very easily and reliably by the separator 13. . Here, when connecting the segment 7 to the underground continuous wall 5 by the separator 13,
Even if the vertical reinforcing bar 6a is arranged in the vicinity of either one of the mounting hole portions 12a and 12b of the mounting plate 11, as shown in FIGS. 4 and 5, the other end of the separator 13 is connected to the other other end. By stopping it, the segment 7 and the underground continuous wall 5 can be reliably connected by the separator 13.

That is, according to the underground tank 1 of the above embodiment, the connection between the underground continuous wall 5 and the segment 7 can be surely performed without being disturbed by the vertical rebar 6a constituting the rebar assembly 6. it can.

In the above embodiment, the mounting hole portion 12
Although the distance between a and 12b is made wider than the diameter of the vertical reinforcing bar 6a, preferably, as shown in FIG.
3 from the fixed position A with the underground continuous wall 5 to the mounting hole 12
The distance x from the fixed position A to the disposition position C of the vertical rebar 6a with respect to the distance X to the locking position B with a and 12b.
It is desirable that the ratio of is larger than the value obtained by multiplying the diameter of the vertical reinforcing bar 6a. That is, if the distance between the mounting hole portions 12a and 12b is D and the diameter of the vertical reinforcing bar 6a is d,
It becomes like the following formula.

[0016]

## EQU00001 ## D.gtoreq.X / x.multidot.d The distance dimension D determined by the above equation is appropriately modified depending on the diameter of the separator 13 used.

[0017]

As described above, according to the underground tank of the present invention, the following effects can be obtained. According to the underground tank of claim 1, the mounting plate provided on the segment is provided with a pair of mounting portions to which the separators for supporting the segments are spaced from each other on the continuous wall are horizontally spaced. Therefore, for example, even if a part of the reinforcing bar is arranged in the vicinity of the attachment plate and the separator cannot be attached to one of the attachment portions, the separator can be attached to the other attachment portion. That is, the connection between the continuous wall and the segment can be reliably performed without being hindered by the reinforcing bar.

According to the underground tank of the second aspect, by inserting the other end of the L-shaped bent separator from above into the mounting portion consisting of the hole of the mounting plate, it is extremely easy to replace the separator. The ends can be locked and attached to the mounting plate. As a result, the efficiency of supporting the segment on the continuous wall can be further improved. According to the underground tank of claim 3, since the interval between the mounting portions is made wider than the diameter of the reinforcing bar arranged in the vertical direction, the interference between the vertical reinforcing bar and the separator can be more reliably prevented. can do.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a side wall under construction illustrating a structure for supporting a segment constituting the side wall of an underground tank to an underground continuous wall according to an embodiment of the present invention.

FIG. 2 is a side sectional view of the side wall under construction for explaining the support structure of the segment constituting the side wall of the underground tank to the underground continuous wall according to the embodiment of the present invention.

FIG. 3 is a top view of a part of the segment for explaining the configuration and structure of the segment constituting the sidewall of the underground tank according to the embodiment of the present invention.

FIG. 4 is a plan view of a connecting portion between a segment and a separator which form an underground tank according to an embodiment of the present invention.

FIG. 5 is a plan view of a connecting portion between a segment and a separator that form an underground tank according to an embodiment of the present invention.

FIG. 6 is a schematic plan view of a segment supporting portion of a segment for explaining a space size between mounting hole portions formed in a mounting plate of a segment which constitutes an underground tank according to an embodiment of the present invention.

FIG. 7 is a cross-sectional view of an underground tank illustrating the configuration and structure of the underground tank.

FIG. 8 is a side sectional view of a side wall for explaining the configuration and structure of the side wall of the underground tank using the segment.

[Explanation of symbols]

1 underground tank 2 side walls 5 underground continuous wall (continuous wall) 6 Assembly rebar (rebar) 6a Vertical rebar (rebar) 7 segments 11 Mounting plate 12a, 12b Mounting hole portion (mounting portion) 13 separator K concrete

Front page continuation (58) Fields surveyed (Int.Cl. ⁷ , DB name) E02D 29/045 E04H 7/18 301

Claims (3)

(57) [Claims] 1. A cylindrical continuous wall constructed in the ground,
A plurality of segments that are assembled at intervals on the inner peripheral side of the continuous wall to form a cylindrical wall body, a reinforcing bar arranged between the segment and the continuous wall, the segment and the continuous wall An underground tank having a side wall made of concrete cast between the segment and the continuous wall, one end of which is attached to the continuous wall, and the other end of which is attached to the segment. An underground tank, which is connected by a separator attached to a mounting part of the mounting plate, and wherein the mounting plate is provided with a pair of the mounting parts at intervals in the horizontal direction. 2. The mounting portion comprises a hole formed in the mounting plate, and the other end of the separator is bent into an L shape and is inserted into the hole from above. The underground tank according to claim 1, wherein the underground tank is locked to a plate. 3. The underground tank according to claim 1, wherein the interval between the mounting portions is at least larger than the diameter of the reinforcing bars arranged in the vertical direction.