JP4611505B2 - Storage tank and storage tank construction method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a storage tank and a storage tank construction method.
[0002]
[Prior art]
As a storage tank for storing LNG (liquefied natural gas) and LPG (liquefied petroleum gas) in a low temperature state, a cylindrical flat bottom storage tank as shown in FIG. 4 is generally used. The storage tank T shown in FIG. 4 includes an outer tub (tank) 103 made of PC concrete and an inner tub 104 made of a metal plate such as stainless steel, and a dome is formed at the upper ends of the outer tub 103 and the inner tub 104. Shaped roof D is installed. The outer tub 103 has a side wall portion S formed in a cylindrical shape, and a liner plate 106 made of a thin metal plate such as carbon steel provided on the inner peripheral surface of the side wall portion S. Between the outer tub 103 and the inner tub 104, a cold insulating material (heat insulating material) 105 made of pearlite, PUF, or the like is provided. The outer tub 103 is for maintaining the strength of the entire tank, and the liner plate 106 is for keeping moisture from the inside from entering the inside and maintaining the hermeticity against stored items.
[0003]
FIG. 5 is a development view of the liner plate 106. As shown in FIG. 5, the liner plate 106 is formed by connecting a plurality of metal plate members 106 a having a rectangular shape in plan view, with the longitudinal direction being horizontal. As shown in FIG. 6, the end surface of the plate member 106a is an inclined surface, and a groove shape is formed by abutting the end surfaces of the adjacent plate members 106a. On the other hand, anchor members 107 are provided at a plurality of predetermined positions on the side wall portion S of the outer tub 103, and a groove-shaped butting portion (groove portion) 108 is disposed on the anchor member 107. Then, arc welding is performed on the abutting portion 108 so that each plate member 106a is fixed to the side wall portion S of the outer tub 103 via the anchor member 107, and adjacent plate members 106a are also connected to each other. The In addition, the metal dowel for stabilizing the connection with the side wall part S of the outer tank 103 is embedded at a plurality of positions of each plate member 106a.
[0004]
[Problems to be solved by the invention]
Since the construction of the liner plate 106 in the storage tank T as described above is a configuration in which welding is performed after the abutting portion 108 of the adjacent plate member 106a and the anchor member 107 are positioned, the anchor member 107 is set to a predetermined position. The plate member 106a must be processed into a predetermined shape with high accuracy. Furthermore, the plate member 106a must be installed with high accuracy even at the construction site. Moreover, since the adjacent plate member 106a is joined by butt welding, it is preferable to make the butt | matching part 108 into a groove shape in order to improve joinability and workability | operativity. For this reason, the end surface of the plate member 106a must be processed into an inclined surface. Thus, in the storage tank T mentioned above, many processes and predetermined processing accuracy are required, and the burden on the installer at the construction site is also increased. Therefore, there is a problem that the construction period becomes longer and the cost also increases.
[0005]
In some cases, the liner plate 106 is used as an inner mold for placing the outer tub 103 made of concrete. In this case, the liner plate 106 has sufficient strength to be used as the inner mold. Therefore, it is necessary to form a thick plate. For this reason, the cost increases, and the workability also decreases because each plate member 106a becomes heavy.
[0006]
This invention is made | formed in view of such a situation, Comprising: While it has favorable storage property, it aims at providing the construction method of a storage tank and a storage tank with good workability, suppressing cost. .
[0007]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the storage tank of the present invention is a storage tank including a tank, wherein the tank is a cylindrical side wall portion and a liner provided on the inner peripheral surface of the side wall portion. A plate, and an anchor member that is provided at a plurality of predetermined positions on the side wall portion, and a part of which is exposed to the liner plate side, and the liner plate includes a plurality of metal plate members. Each of the plate members is connected to the anchor member and the other part is overlapped with a part of another adjacent plate member. It is characterized by being installed.
[0008]
According to the present invention, the liner plate is connected in the circumferential direction of the side wall portion of the tank so that a part of the plate member is connected to the anchor member and the other part is overlapped with a part of the other adjacent plate member. Since it forms by surrounding, even if each board member does not have high processing precision, the liner plate which has high sealing performance can be constructed in a short period of time.
[0009]
Since the overlapping parts of the adjacent plate members are connected by fillet welding, it is not necessary to position the adjacent plate members with high precision during construction, and the connection of these plate members can be easily and stabilized in a short time. Can be done. Moreover, since it is fillet welding, the process etc. which provide a groove part become unnecessary.
[0010]
Each of the plate members has a rectangular shape in plan view, and is installed so that the longitudinal direction thereof is along the axial direction of the side wall portion, so that workability can be improved.
[0011]
By providing a plurality of plate members provided around the side wall portion in the axial direction of the side wall portion, a liner plate having good sealing performance as a whole can be formed.
[0012]
The method for constructing a storage tank according to the present invention is the method for constructing a storage tank comprising a tank, wherein the side wall of the tank is formed into a cylindrical shape with concrete, and a part of the side wall is disposed at a plurality of predetermined positions on the side wall. When the anchor member is installed so as to be exposed in the inner direction of the portion, and a liner plate is formed by arranging a plurality of metal plate members on the inner peripheral surface of the side wall portion in the circumferential direction of the side wall portion. A part of the plate member is connected to the anchor member, and the other part is installed so as to overlap a part of another adjacent plate member.
[0013]
According to the present invention, by overlapping each plate member with each other, it is possible to easily construct a liner plate having a good sealing performance in a short time even if these plate members do not have high processing accuracy. Can do. In addition, since a process of providing a groove portion or the like is unnecessary, the process can be shortened and the cost can be reduced. Further, the liner plate forming process is performed after the tank forming process is completed, and the two processes are independent. Therefore, since each process does not interfere with each other, efficient construction can be performed.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
The storage tank of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of an essential part for explaining an embodiment of a storage tank according to the present invention, FIG. 2 is a horizontal sectional view of the storage tank, and FIG. 3 is a plate member and anchor constituting a liner plate. It is a figure for demonstrating a mode that the member is connected, Comprising: Fig.3 (a) is a front view, FIG.3 (b) is the figure which looked at Fig.3 (a) from the downward direction. The description of this embodiment relates to the storage tank T as described with reference to FIG. 4, and the same or equivalent components are denoted by the same reference numerals and the description thereof is simplified or omitted. To do. The “outer tank” in the following description corresponds to the “tank” recited in the claims.
[0015]
1 and 2, the storage tank T includes a concrete outer tub (tank) 1 and a metal plate inner tub 104 (the inner tub 104 is not shown in FIG. 1). In the outer tub 1, anchor members 3 are provided at a plurality of predetermined positions of the side wall portion S formed in a cylindrical shape, and a liner plate 2 is provided on the inner peripheral surface of the side wall portion S. The outer tub 1 is composed of concrete walls constructed by the PC method and is used to maintain the strength of the entire tank. This is to maintain the sealing performance against the object.
[0016]
The liner plate 2 is composed of a plurality of plate members 2a. The plate member 2a is formed in a rectangular shape in plan view with a metal such as carbon steel. And each plate member 2a is each installed so that the longitudinal direction may follow the axial direction of the side wall part S formed in the cylinder shape among the outer tanks 1. FIG.
[0017]
As shown in FIG. 2, the liner plate 2 is configured by installing a plurality of plate members 2 a in the circumferential direction over the entire inner circumference of the side wall portion S of the outer tub 1. At this time, the plate member 2a is provided so as to overlap end portions adjacent to each other. The liner plate 2 is provided with a cold insulating material (heat insulating material) 105 made of pearlite, PUF, or the like, and an inner tank 104 made of a metal plate is provided inside the cold insulating material 105. ing.
[0018]
As shown in FIG. 3, the anchor member 3 is provided on the side wall portion S so that the collar portion 3 a provided on a part of the anchor member 3 is exposed on the inner peripheral surface side of the side wall portion S of the outer tub 1. Yes. As shown in FIGS. 1 to 3, among the plate members 2 a formed in a rectangular shape in plan view, one end is connected to the collar portion 3 a of the anchor member 3, and the other end of the other plate member 2 a is adjacent. It is installed so as to overlap a part. At this time, since each plate member 2a is installed substantially parallel to each other so that the longitudinal direction thereof is along the axial direction of the side wall portion S, all the end sides of the adjacent plate members 2a overlap each other. .
[0019]
The connection between the flange portion 3a of the anchor member 3 and one end of the plate member 2a is performed by arc welding (fillet welding) of a substantially right-angled surface formed by the flange portion 3a and the plate member 2a. On the other hand, the overlapping portions 7 of the adjacent plate members 2a are also connected by arc welding (fillet welding) of substantially perpendicular surfaces formed in the overlapping portions 7.
[0020]
Then, a plurality of plate members 2 a provided in the circumferential direction of the side wall portion S of the outer tub 1 form a one-step liner plate 2, and by providing a plurality of steps in the axial direction of the side wall portion S, the liner plate 2 The whole is formed. A metal top angle 6 is installed at the upper end of the side wall S.
[0021]
Next, the construction method of the storage tank T provided with the configuration as described above will be described.
First, a concrete outer tub (tank) 1 is placed by assembling a mold. At this time, the anchor members 3 are installed at a plurality of predetermined positions of the side wall portion S so that the collar portion 3a is exposed in the inner side direction of the side wall portion S of the outer tub 1. The predetermined position where the anchor member 3 is installed is set in advance according to the shape (size) of the plate member 2a to be installed in the subsequent process and the installation position. Next, a top angle 6 is provided on the uppermost part of the side wall S of the outer tub 1.
[0022]
If the side wall part S (outer tank 1) in which the anchor member 3 is embedded is constructed, the plate member 2a is sequentially installed on the side wall part S. First, as shown in FIG. 3, a part (half region) of the collar part 3 a of the anchor member 3 and one end (part) of the plate member 2 a are brought into contact with each other, with respect to the substantially perpendicular plane formed. Perform arc welding (fillet welding). At this time, as shown in FIG. 1, the plurality of anchor members 3 are arranged in series in the axial direction of the side wall portion S of the outer tub 1 in accordance with the shape (size) of the plate member 2 a to be attached. The plate member 2a and the anchor member 3 are fixed by fillet welding the flange portions 3a of the anchor members 3 arranged in series and one end of the plate member 2a. Of the plurality of plate members 2a installed on the side wall portion S, only the plate member 2a (position P1 in FIG. 2) that is fixed to the anchor member 3 first is the flange portion of the anchor member 3 at both ends. It is fixed to 3a.
[0023]
When the plate member 2a at the position P1 is installed on the anchor member 3, the second plate member 2a (position P2 in FIG. 2) is installed at a position adjacent to the plate member 2a. Specifically, one end of the plate member 2a at the position P2 is brought into contact with the collar portion 3a of the anchor member 3 installed in advance, and arc welding (fillet welding) is performed on the formed substantially right-angled surface. . By this fillet welding, one end of the plate member 2a and the anchor member 3 at the position P2 are fixed. On the other hand, the other end of the plate member 2a at the position P2 is overlapped with a part of the plate member 2a at the adjacent position P1, and arc welding (fillet welding) is performed on a substantially right-angled surface formed in the overlapping portion 7. ). By this fillet welding, the respective plate members 2a at the positions P1 and P2 are connected to each other. Thus, the plate member 2a at the position P2 is fixed to both the other adjacent plate member (plate member at the position P1) 2a and the anchor member 3.
[0024]
Hereinafter, similarly, one end of the plate member 2a is connected to the anchor member 3, and the other end is sequentially installed so as to overlap a part of the other adjacent plate member 2a. Thus, the plurality of plate members 2 a are provided in the circumferential direction over the entire circumference of the side wall portion S. In this way, when the peripheral arrangement of the first-stage plate member 2a is completed, the peripheral arrangement of the plate member 2a in the next stage is similarly performed. At this time, the end portions of the plate members 2a adjacent to each other in the vertical direction in the first step and the second step are also overlapped, and fillet welding is also applied to the overlapped portion. The construction of the plate member 2a may be performed from the upper stage side or from the lower stage side. And when the construction of the liner plate 2 is finished, the heat insulating material 105 and the inner tub 104 are constructed.
[0025]
As described above, the liner plate 2 has one end of the plate member 2a formed in a rectangular shape in plan view connected to the collar portion 3a of the anchor member 3, and the other end is an end portion of the adjacent other plate member 2a. Are formed so as to be overlapped with each other in the circumferential direction of the side wall portion S of the outer tub (tank) 1, so that each plate member 2 a does not have high processing accuracy. The plate member 2a can be stably connected in a short time. Therefore, the liner play 2 having high sealing performance can be applied in a short period of time.
[0026]
Since the overlapping portions 7 of the adjacent plate members 2a are connected by fillet welding, it is not necessary to position the adjacent plate members 2a with high accuracy during construction. That is, fillet welding can be performed as long as the overlapping portion 7 of the plate member 2a is formed. Therefore, it is possible to easily and stably connect the plate members 2a adjacent to each other in a short time. In addition, since fillet welding is used, a step of providing a groove portion as in the case of butt welding as in the prior art becomes unnecessary, and therefore, reduction of the process and shortening of the work period can be realized.
[0027]
Since each plate member 2a has a rectangular shape in plan view and is installed such that its longitudinal direction is along the axial direction of the side wall portion S, the workability can be improved. That is, when welding is performed while supporting the plate member 2a with a crane or the like when the plate member 2a is large, the crane can realize stable support by supporting, for example, only one point of the upper end of the plate member 2a. Workability can be improved. Further, by making the longitudinal direction of the plate member 2a along the axial direction, it is not necessary to bend the plate member 2a when the plate member 2a is provided. That is, when the longitudinal direction of the plate member 2a is provided in a direction intersecting with the axis of the side wall portion S, it is necessary to weld the plate member 2a while bending it according to the tank shape, but this is not necessary in the present embodiment. Therefore, workability can be improved.
[0028]
The construction process of the liner plate 2 is performed after the construction process of the outer tub 1 is completed, and the two processes are independent. Therefore, since each process does not interfere with each other, efficient construction can be performed. That is, for example, when the liner plate is used as a formwork for placing an outer tub, the liner plate and the outer tub must be formed simultaneously, so other construction work is performed. There is a risk of inconvenience if you want to. However, since each process is performed independently, it is possible to perform the work at a desired timing, so that it is possible to realize efficient workability. At this time, since the liner plate is not used as a mold, the thickness of the liner plate can be reduced. Therefore, cost can be suppressed. In addition, since a light plate member having a small plate thickness is handled, workability is improved. Furthermore, since a thin plate member is handled, it is possible to use a plate member having a large surface area with respect to a predetermined weight (for example, a weight that can be transported by a crane or an operator). Therefore, since the number of welding locations when building the liner plate can be reduced, the construction period can be shortened.
[0029]
In addition, in embodiment mentioned above, although the construction method of the liner plate in the side wall part S among the outer tanks (tanks) 1 was demonstrated, the structure and construction method of the liner plate in this side wall part S are a tank (outer tank). It is also possible to apply to the bottom of the.
[0030]
【The invention's effect】
The storage tank and the storage tank construction method of the present invention have the following effects.
According to the storage tank of the present invention, the liner plate is a tank (outer tank) in which a part of the plate member is connected to the anchor member and the other part is overlapped with a part of another adjacent plate member. Because it is formed by circumferentially arranging the side wall part of the plate, even if each plate member does not have high processing accuracy, a liner plate having high sealing performance can be constructed in a short period of time. Can do. In addition, since the overlapping parts of adjacent plate members are connected by fillet welding, it is not necessary to position plate members adjacent to each other with high precision during construction, and these plate members can be easily and stably connected in a short time. Can be done. Moreover, since it is fillet welding, it is possible to realize a reduction in the process and a shortening of the work period, such as the need for a process of providing a groove portion as in the prior art.
[0031]
According to the construction method of the storage tank of the present invention, by overlapping the respective plate members with each other, liner plates having good sealing performance can be obtained in a short time even if these plate members do not have high processing accuracy. It can be easily constructed. In addition, since a process of providing a groove portion as in the prior art is unnecessary, it is possible to reduce the process and the work period, and to reduce the cost. Further, the liner plate forming process is performed after the tank (outer tank, side wall) forming process is completed, and the two processes are configured independently. Therefore, since each process does not interfere with each other, efficient construction can be performed.
[Brief description of the drawings]
FIG. 1 is a perspective view of an essential part for explaining an embodiment of a storage tank of the present invention.
FIG. 2 is a horizontal sectional view of the storage tank of the present invention.
FIGS. 3A and 3B are diagrams for explaining a state in which a plate member and an anchor member are connected, where FIG. 3A is a front view, and FIG. 3B is a view as viewed from below (a).
FIG. 4 is a diagram for explaining the entire storage tank;
FIG. 5 is a development view for explaining a liner plate of a conventional storage tank.
FIG. 6 is a view for explaining a state in which a liner plate and an outer tank (tank) in a conventional storage tank are connected.
[Explanation of symbols]
1 Outer tank (tank)
2 liner plate 2a plate member 3 anchor member 3a collar portion 7 overlapping portion S side wall portion T storage tank

Claims (5)

In a storage tank with a tank,
The front tank is a concrete side wall formed in a cylindrical shape,
A liner plate provided on an inner peripheral surface of the side wall;
An anchor member provided at a plurality of predetermined positions of the side wall portion, and a part of which is exposed to the liner plate side;
The liner plate is formed in a rectangular shape, and a plurality of metal plate members are provided in the circumferential direction so that the longitudinal direction thereof is along the axial direction of the side wall portion ,
Each of the plate members is installed such that a part thereof is connected to the anchor member and the other part is overlapped with a part of another adjacent plate member. . The storage tank according to claim 1,
A storage tank, wherein overlapping portions of adjacent plate members are connected by fillet welding. The storage tank according to claim 1 or 2,
Each of the plate members has a rectangular shape in plan view, and is installed so that the longitudinal direction thereof is along the axial direction of the side wall portion. In the storage tank as described in any one of Claims 1-3,
A storage tank comprising a plurality of plate members provided around the side wall in the axial direction of the side wall. In the construction method of the storage tank with the tank,
The tank side wall portion is formed into a cylindrical shape with concrete, and an anchor member is installed at a plurality of predetermined positions of the side wall portion so that a part thereof is exposed inwardly of the side wall portion. When the liner plate is formed by circumferentially arranging a plurality of metal plate members in the circumferential direction of the side wall portion, the plate member is formed in a rectangular shape and the longitudinal direction of the plate member is the side wall. And a portion of the plate member is connected to the anchor member, and the other portion is installed so as to overlap with a portion of another adjacent plate member. How to build a storage tank.

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