JP3764705B2 - Storage tank - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a storage tank using a storage tank connecting member for connecting a roof to a storage tank body. More specifically, the present invention stores various cryogenic liquids such as liquefied natural gas, liquefied propane gas, liquefied nitrogen, and liquefied oxygen at the outer periphery of the dome-shaped roof. about the storage tank (tank) suitable.
[0002]
[Prior art]
Such a storage tank includes an underground storage tank and an above-ground storage tank. For example, the underground storage tank employs a configuration as shown in FIG.
That is, in FIG. 2, the underground storage tank 1 is roughly divided into a concrete vertical cylindrical storage tank (frame or side) 3 constructed in the ground 2, and a dome-shaped roof constructed on the storage tank. 4 is included. The tank body 3 is closed by a bottom plate 5 having a flat bottom.
[0003]
On the other hand, the roof 4 is composed of a number of metal roof units, assembled on the inner bottom of the storage tank body 3 and then lifted by a crane or the like, and its outer periphery is connected and fixed to the upper end of the storage tank body 3. The opening top of the storage tank 3 is closed. According to the prior art, this connection is made via a ring-shaped, relatively thick (eg, about 45 mm) thick knuckle ring 6 and a body plate 7 that is thinner than the knuckle ring (eg, about 25 mm). It has been broken. As for the knuckle ring 6 and the body plate 7, those divided into a plurality in the circumferential direction are joined by welding.
[0004]
FIG. 3 shows the peripheral structure of the knuckle ring 6 and the body plate 7 by enlarging the portion A of FIG.
In FIG. 3, the steel knuckle ring 6 is curved inwardly in accordance with the curved shape of the dome-shaped roof 4 (see FIG. 2), and the upper end thereof is joined to the outer peripheral portion of the roof 4 by welding. Similarly, the bottom plate 7 made of steel is embedded and fixed in the upper end of the storage tank body 3 via the base plate 8.
The body plate 7 has a plurality of holes (not shown) through which reinforcing bars for concrete reinforcement are passed.
[0005]
And the lower end of the knuckle ring 6 and the upper end of the trunk | drum 7 are united and integrated by welding, and the code | symbol 9 has shown the welding part, as it expands and shows in detail in FIG.
As shown in FIGS. 2 and 3, the underground storage tank 1 includes a side body cooling layer 10 and a roof inner cooling layer 11 disposed along the inner surfaces of the storage body 3, the roof 4, and the bottom plate 5, respectively. And the bottom cold insulation layer 12, the side membrane 13 and the bottom meibrene 14, which are disposed along these side portions and the bottom cold insulation layer and maintain liquid tightness and air tightness such as liquefied natural gas filled in the tank, and the storage periphery In order to control the extension of the frozen soil (reference numeral 15 indicates embankment), a heater 16 (the heater on the bottom side is not shown) disposed on the side and bottom of the reservoir body, a pump stage 17, piping and support A black 18, a pump barrel frame 19 and the like are appropriately provided as necessary.
Some underground storage tanks are provided with a suspension deck that is suspended from a roof by a suspension rod and holds a cold insulation layer on the side of the roof.
[0006]
[Problems to be solved by the invention]
In the prior art described above, since the roof 4 is dome-shaped while the storage tank 3 is vertical cylindrical, the structural discontinuity between them is alleviated and the internal pressure acting on the dome-shaped roof ( In order to make it possible to smoothly transmit the force generated in the connection part by gas pressure etc.), the cylindrical body plate 7 is attached to the storage tank side, while the curved knuckle ring 6 is attached to the roof side, These are integrated by welding 9. That is, the knuckle ring 6 and the body plate 7 are different in shape, and therefore the bending method is also different. The knuckle ring 6 is subjected to press forming to form a three-dimensional curved surface, and the body plate 7 is subjected to roll processing. Thus, after carrying out bending work separately, both were combined and integrated by welding.
[0007]
However, such a welded joint structure between the knuckle ring 6 and the body plate 7 has the following problems.
First, since the dome-shaped roof 4 is lifted by the internal pressure, as shown in FIG. 3, the anchor point 20 is provided in the embedded fixing portion between the trunk plate 7 and the tank body 3, and the roof 4 is pulled out from the base plate. However, since the welded portion 9 between the knuckle ring 6 and the body plate 7 is close to the anchor point 20 and corresponds to a stress concentration location on the structure, the reliability of the welded portion 9 becomes a problem. . In particular, since the dome-shaped roof is legally part of the pressure vessel (for example, a pressure vessel of 0.024 MPa (gauge pressure)), this weld is welded to the pressure vessel. In addition, quality control such as inspection of welds is important.
[0008]
Secondly, a large number of, for example, 15 knuckle rings 6 divided in the circumferential direction are welded to each other around the outer periphery of the dome-shaped roof 4 as shown in FIG. In addition, a large number of body plates 7 are also welded to each other around the upper end of the storage tank body 3 (reference numeral 22 indicates the weld line). Lines 21 and 22 (longitudinal weld joints) coincide with each other in the axial direction (longitudinal direction) of the storage tank, are orthogonal to the weld line 9 (circumferential weld joint) between the knuckle ring 6 and the body plate 7, Therefore, it is necessary to adjust (shift) the lengths of the knuckle ring 6 and the body plate 7 so as not to become.
[0009]
The present invention has been made in view of the above circumstances, and solves the problem of the welded joint structure by devising a connecting member that joins between the outer periphery of the dome-shaped roof and the vertical cylindrical storage tank body. The object is to improve the connection of the dome-shaped roof to the reservoir.
[0010]
[Means for Solving the Problems]
In the present invention, the following means are adopted in order to solve the above problems.
The connection member for a storage tank according to claim 1 is a storage tank including a dome-shaped roof, a vertical cylindrical storage body, and a connection member for a storage tank that connects between the storage tanks. consists of a single curved plate which is formed by bending using a press, it said single curved plate has a vertical portion the lower end portion is coupled to the upper end of the reservoir body without vertical, songs the single consist vertical portion of the face plate and a in accordance with the curved portion curved portion inwardly of the domed roof, the displacement buffer between the inner surface and the upper end projecting portion formed in the reservoir body of the vertical portion It is characterized by interposing a heat insulating material .
According to such a means, since a single curved plate directly connects between the outer peripheral portion of the dome-shaped roof and the vertical cylindrical storage tank body, it is possible to provide a connection structure in which there is no weld in the middle portion. it can.
In addition, the lower end of a single curved plate is substantially vertical and joined to the upper end of the storage tank, and has the same effect as the body plate in the conventional example, so the internal pressure (gas pressure, etc.) acting on the dome-shaped roof Can smoothly transmit the force generated in the connecting portion.
[0013]
In particular, when the storage tank described above is an underground storage tank that stores liquefied natural gas, liquefied propane gas, etc., a single curved plate directly connects the outer periphery of the dome-shaped roof to a vertical cylindrical storage tank made of concrete. The connection part has no welded part in the middle, and the lower end part of the single curved plate is substantially perpendicularly embedded and fixed in the upper end of the storage tank, and exhibits the same action as the trunk plate in the conventional example. Therefore, it is possible to smoothly transmit the force generated at the connecting portion by the internal pressure (gas pressure or the like) acting on the dome-shaped roof.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described in detail with reference to FIG. This embodiment is applied to the underground storage tank shown in FIG. 2, and FIG. 1 corresponds to FIG.
[0015]
In FIG. 1, the connecting member according to the present invention comprises a single curved plate 30 formed by three-dimensional bending of a steel plate by pressing. And in order to connect the outer peripheral part of the dome-shaped roof 4 (refer FIG. 2) to the concrete-made vertical cylindrical storage tank 3 of the storage tank 1 using this curved-surface board 30, first, the lower end part 30a of the curved-surface board 30 is shown. It is embedded and fixed in the upper end of the storage tank body 3 through a base plate 8 for preventing the roof from dropping out in a substantially vertical manner.
In addition, a plurality of holes (not shown) through which reinforcing bars for concrete reinforcement are passed are formed in the lower end portion 30a of the curved plate 30 as in the case of the body plate 7 of the conventional example.
Then, the dome-shaped roof 4 (see FIG. 2) assembled on the inner bottom portion of the storage tank body 3 is lifted by a crane or the like, and its outer peripheral portion is connected and fixed to the upper end portion 30b of the curved plate 30 by welding.
[0016]
This curved plate has a shape in which the knuckle ring 6 in the conventional example is enlarged and the body plate 7 is omitted, so that the connection work by welding the knuckle ring and the body plate in the conventional example is unnecessary, and a cross weld joint is provided. Therefore, it is not necessary to adjust the length of the knuckle ring and the body plate to avoid this.
[0017]
In the present embodiment, further, the inner surface of the curved surface plate 30 that is vertically exposed from the storage body 3 and transitions to a portion 30 c that is curved inwardly in accordance with the curved shape of the dome-shaped roof 4. A displacement buffering heat insulating material 31 is interposed between the upper end protruding portion 3 a of the storage tank body 3. As in the conventional example, the roof inner cold insulation layer 11 is disposed on the inner surface of the curved plate 30, the side membrane 13 and the like are disposed on the inner surface of the storage body 3, and the lower end portion of the curved plate 30. The anchoring point 30a is an anchor point.
[0018]
In the embodiment described above, an example in which the present invention is applied to an underground storage tank has been illustrated and described. However, if the storage tank body is a vertical cylindrical shape, the above-described storage tank body of a PC concrete wall can be used as well as the storage tank body. Needless to say, the present invention can also be applied to a steel-type ground storage tank.
[0019]
【The invention's effect】
As described above, according to the first aspect of the present invention, the connecting member for connecting the outer peripheral portion of the dome-shaped roof to the vertical cylindrical storage tank body is formed by a single curved plate formed by bending with a press. Since this single curved plate is used to connect the outer periphery of the dome-shaped roof directly to the vertical cylindrical storage tank, and it has a joint structure with no welded part in the middle, the stress concentration part of the connection part Becomes the base material and improves reliability.
Further, since the joining work by welding the knuckle ring and the body plate in the conventional example becomes unnecessary, it is possible to omit groove processing, welding work, welding inspection, length adjustment of the knuckle ring and the body plate, and the like. .
[0020]
Further, according to the present invention according to claim 1 , since the lower end portion of the single curved plate is substantially perpendicularly coupled to the upper end of the storage tank body, the same action as the trunk plate in the conventional example is exhibited. In addition, since the force generated in the connecting portion can be smoothly transmitted by the internal pressure (gas pressure or the like) acting on the dome-shaped roof, the reliability of the coupling portion can be improved.
[0021]
In addition, the dome-shaped roof and the vertical cylindrical storage tank are connected by a single curved plate without welds, reducing the number of welds in pressure vessels that require strict quality control, and reliability. High storage tanks can be provided at low cost.
[0022]
In particular, in underground storage tanks that store liquefied natural gas, liquefied propane gas, etc., a single curved plate can be configured to directly connect the outer periphery of the dome-shaped roof to a concrete vertical cylinder storage tank. Therefore, it becomes a coupling structure with no weld in the middle part, and the lower end part of the single curved plate is substantially vertical and embedded and fixed in the upper end of the storage tank body, and the same action as the trunk plate in the conventional example Since the force generated in the coupling portion can be smoothly transmitted by the internal pressure (gas pressure or the like) acting on the dome-shaped roof, the reliability can be improved.
[Brief description of the drawings]
FIG. 1 is a perspective sectional view of a main part showing an embodiment of a connecting member for connecting a roof to a storage tank body according to the present invention.
FIG. 2 is a perspective cross-sectional view showing an example of an underground storage tank using a conventional connecting member.
FIG. 3 is a perspective cross-sectional view showing in detail a peripheral structure of a knuckle ring and a body plate by enlarging a part A in FIG. 2;
4 is an enlarged view of a part of FIG. 3, showing in detail a welded portion between a knuckle ring and a body plate. FIG.
FIG. 5 is a diagram for explaining one problem of the prior art.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Storage tank 3 Storage tank body 4 Roof 8 Base plate 30 Curved surface board (connection member)
31 Thermal insulation for displacement buffering

Claims (1)

A storage tank comprising a dome-shaped roof , a vertical cylindrical storage body, and a connection member for a storage tank connecting between them,
The connecting member consists of a single curved plate formed by bending with a press,
Inner said single curved plate has a vertical portion the lower end portion is coupled to the upper end of the reservoir body without vertical, to suit the vertical portion of said single curved plate the curved portion of the domed roof It consists of a curved portion towards, reservoir, characterized in that the displacement buffering heat insulating material is interposed between the inner surface and the upper end projecting portion formed in the reservoir body of the vertical portion.

Images