JP6143073B2 - Tank construction method and outer tank liner plate - Google Patents

Description

  The present invention relates to a tank construction method and an outer tank liner plate capable of greatly shortening the construction period of a tank having a breakwater.

  Conventionally, a tank for storing liquefied natural gas (hereinafter referred to as “LNG”) having a breakwater is known as this type of tank. In a tank 100 shown in FIG. 4, a concrete breakwater 103 as an outer peripheral structure is constructed on a foundation plate 102 that is supported on a support pile 101 and has a circular plan view. A steel outer tub 104 is installed inside the liquid breakwater 103, and a steel inner tub 105 is installed further inside. The side space between the outer tub 104 and the inner tub 105 is formed in the side refrigeration material filling portion 106 filled with the side refrigeration material, and the upper space between the outer tub 104 and the inner tub 105 is It is formed in the roof portion cold insulation material filling portion 107 filled with the roof portion cold insulation material, and the bottom cold insulation material filling portion 108 filled with the bottom cold insulation material is formed on the base plate 102.

  In the construction of the tank having the above-mentioned liquid breakwater 103, the machine builder is usually constructed after the support pile 101 is constructed and the foundation plate 102 and the liquid breakwater 103 are constructed by a civil engineering / construction contractor. Is performing mechanical work to construct the outer tub 104 and the inner tub 105. Therefore, civil engineering / architecture work and machine work cannot be carried out in parallel, and the construction period is, for example, several tens of months.

  The extension of the construction period naturally has a problem that the construction cost increases. Therefore, in order to solve such a problem, Patent Document 1 proposes that the outer tub is formed of a precast concrete (PC) mold with an outer tub liner plate.

  In Patent Document 1, a PC formwork with an outer tank liner plate is assembled as an inner formwork of a breakwater on a basic plate, and concrete is placed between the outer formwork assembled on the outer periphery of the inner formwork. And the construction method of the tank which constructs a breakwater is disclosed. In this case, there is no need for an inner scaffold for the breakwater, and the breakwater work and the inner tank work can be carried out at the same time after the foundation plate construction, so the construction period can be shortened.

JP 2010-106501 A

However, in the tank construction method using the PC form with the outer tank liner plate according to the above proposal, there is a problem that the handling property at the time of construction is inferior because the thickness of the PC is 50 to 200 mm.
In addition, the PC formwork part is integrated with the concrete placed on site, but in the structure such as a breakwater of a low temperature tank that applies prestress in the circumferential direction and the vertical direction, the part is designed. As a result, the prestress cannot be introduced and cannot be incorporated into the thickness of the breakwater, resulting in a new problem that the thickness of the breakwater increases only in the part of the PC formwork. It was happening.

  The present invention has been made in view of the above-mentioned problems, and without increasing the thickness of the breakwater, yet it is easy to construct and can greatly reduce the construction period, and a tank construction method, and An object is to provide an outer tank liner plate.

In order to achieve the above object, in the tank construction method according to the present invention, the construction of a tank constructed by constructing a breakwater on the foundation plate and providing an outer tub inside the constructed breakwater In the method, the liquid bank is assembled with an outer tank liner plate that forms the outer tank on the foundation plate as an inner mold frame, and an outer mold is maintained outside the outer tank liner plate at a predetermined interval. Assembling the frame, and constructing by placing concrete between the assembled outer tank liner plate and the outer mold frame, the outer tank liner plate is made of a steel plate having a rectangular shape, and the outer periphery of the steel plate Is characterized in that an outer peripheral support member is provided so as to protrude toward the outside with a predetermined interval, and the outer peripheral support member is housed in a concrete rebar cover .

Moreover, in the outer tank liner plate according to the present invention, while constructing a liquid breakwater on the foundation plate, it is used in a tank construction method configured by providing an outer tank inside the constructed liquid breakwater, While being assembled as an inner mold frame, concrete is placed between the outer mold frame and the outer mold frame assembled on the outside to construct the liquid barrier, and the outer tub is formed on the foundation plate An outer tub liner plate for forming a rectangular steel plate, and an outer peripheral support member is provided at a predetermined interval on an outer peripheral portion of the steel plate, and the outer peripheral support member is in contact with an adjacent outer peripheral support member. The outer peripheral support member is provided so as to protrude toward the outer side, and the outer tank liner plate is assembled as the inner mold frame at a distance from the outer mold frame. Placed between the inner formwork It is characterized that you have housed in the fog rebar of the concrete was.

In the present invention, since the outer tank liner plate can be used as the inner mold of the liquid barrier, the inner tank can be constructed in parallel without requiring a scaffold for the conventional inner mold, and the construction period can be increased. It can be greatly shortened.
In the present invention, since the outer tank liner plate is lighter and thinner than the precast concrete formwork with the outer tank liner plate, it is excellent in handling at the time of construction, and also has a liquid breakwater There is an advantage that the thickness of the film is not increased. Therefore, construction becomes easy, work efficiency improves, and a work period can be shortened.

Further, in the method of constructing the tank according to the present invention, the outer tub liner plate, the periphery supporting member is preferably assembled in contact with the outer periphery support member adjacent the outer tank liner plate.

  In the present invention, the outer peripheral support members of adjacent outer tank liner plates can be brought into contact with each other for assembly.

  In the tank construction method according to the present invention, it is preferable that the outer tank liner plate is assembled by bolting with a packing material interposed between the outer peripheral support materials.

  Moreover, it is preferable that the outer tub liner plate according to the present invention has a configuration in which a packing material is interposed between the outer peripheral support materials and is assembled by bolting.

  According to the present invention, the outer peripheral support members of adjacent outer tub liner plates can be joined and assembled by bolting, so that welding work is not required and work efficiency can be improved.

  According to the tank construction method and the outer tank liner plate of the present invention, construction is easy and the construction period can be greatly shortened without increasing the thickness of the liquid barrier.

It is a side view for demonstrating the outline | summary of the implementation state of the construction method of the tank by embodiment of this invention. (A) is a front view of an outer tank liner plate used in the tank construction method according to the present embodiment, (b) is a right side view thereof, (c) is an assembly drawing thereof, and (d) is an assembly view of (c). Detailed view of part A, (e) is a detailed view of part B in (c). (A)-(f) is process drawing of the construction method of the tank by this Embodiment. It is sectional drawing which shows schematic structure of the tank which stores the conventional LNG.

  Hereinafter, a tank construction method and an outer tank liner plate according to embodiments of the present invention will be described with reference to the drawings. The present invention is not limited to this embodiment, and constituent elements in the following embodiments include those that can be easily replaced by those skilled in the art or those that are substantially the same. .

As shown in FIG. 1, a tank 1 according to the present embodiment is a tank that stores LNG.
Here, FIG. 3 (a)-(f) shows the flowchart of the construction method, and FIG. 2 (a)-(e) shows the outer tank liner plate 10 of the component of the tank 1. FIG. Yes.

First, before explaining the construction method of the tank 1, the schematic structure of the tank 1 manufactured by this construction method is demonstrated using FIG.
In the tank 1, a liquid bank 3 as an outer peripheral structure is constructed on a foundation plate 2 that is supported on a support pile (not shown) and has a circular plan view. The inner side of the liquid breakwater 3 (the inner side of the tank 1) is formed by an outer tank liner plate 10 described later.

  In FIG. 1, in order to simplify the drawing, a part of the tank 1 corresponding to the lower left portion of FIG. 4 is shown. Therefore, when the tank 1 is completed, as in the tank 100 shown in FIG. 4, the outer tank liner plate 10 is installed inside the liquid breakwater 3, and further, the inner steel plate (not shown) is installed inside the tank. A tank is installed. And the side space between the outer tub liner plate 10 and the inner tub is formed in the side refrigeration material filling portion filled with the side refrigeration material, and the upper space between the outer tub liner plate 10 and the inner tub is The roof portion cold insulation material is filled with the roof portion cold insulation material filling portion. On the foundation plate 2, a bottom cold insulation material filling portion is formed.

  The tank 1 in the middle of the construction shown in FIG. 1 shows the middle of the construction in which lots formed by dividing the breakwater 3 into a plurality of heights on the base plate 2 are being built. In the figure, a state is shown in which the first breakwater lot 3A to the fourth breakwater lot 3D on the base plate 2 are completed. And the state just before the crane M is removed from the outer tank liner plate 10 of 4th breakwater lot 3D is shown.

  In addition, the code | symbol F in FIG. 1 is a scaffold for construction, Comprising: It is provided in the outer side (the tank 1 side opposite side, the paper left side in FIG. 1) of the breakwater 3 and code | symbol 2A is an anchor. It is provided on the outer peripheral edge of the base plate 2. The anchor 2A is provided between the base plate 2 and the inner tank in order to prevent an inner tank (not shown) provided on the base plate 2 from floating due to an earthquake or the like.

  Hereinafter, the outer tank liner plate 10 used in the construction method of the tank 1 according to the present embodiment will be described with reference to FIGS.

  The outer tank liner plate 10 is made of a steel plate having a rectangular shape (in the illustrated example, a rectangle), and specifically has a plate thickness of about 8 mm, a short side of about 2400 mm, and a long side of about 7500 mm. An outer peripheral angle member 11 (outer peripheral support member) having a predetermined diameter hole for bolt insertion is welded around the one surface side (the front side in FIG. 2A) at a predetermined interval. It is fixed by etc. Further, a reinforcing angle member 12 is fixed between the outer peripheral angle members 11 facing each other by welding or the like while maintaining a predetermined interval. In the example shown in the figure, three reinforcing angle members 12 are arranged at predetermined intervals in the left-right direction, and one reinforcing angle member 12 is arranged in the center in the vertical direction. The outer tub liner plate 10 is manufactured at a factory. In addition, the planar shape of the outer tank liner plate 10 may be a square or a horizontally long rectangle.

  As shown in FIG. 2C, the outer tub liner plate 10 having the above-described configuration is configured such that a plurality of outer tub liner plates 10 are sandwiched with a packing material 13 made of rubber between the outer peripheral angle members 11 in the vertical and horizontal directions. The bolts and nuts 14 are assembled while being in contact with each other while increasing the water-stopping property (see FIGS. 2D and 2E). In this assembly, one outer tank liner plate 10 is lifted by the crane M and attached to the adjacent outer tank liner plate 10 assembled in advance (see FIG. 1).

  In the assembly of the outer tub liner plate 10, a plurality of outer tub liner plates 10 can be assembled in advance on the ground, and the assembly can be lifted by the crane M and attached to the adjacent outer tub liner plate 10. . Therefore, in the present invention, both one outer tank liner plate 10 and a plurality of assembled outer tank liner plates 10 are “outer tank liner plates”.

  Next, the construction method of the tank 1 is demonstrated using Fig.3 (a)-(f). Here, an example of constructing the fifth breakwater lot 3E on the fourth breakwater lot 3D is shown. In these drawings, the scaffold F shown in FIG. 1 is omitted in order to simplify the drawing.

  FIG. 3A shows an upper portion of the fourth breakwater lot 3D. In this upper portion, an outer mold frame 20 is provided outside the outer tank liner plate 10 with a predetermined distance. And while the channel steel 30 protrudes upwards from the center position of the outer tank liner plate 10 and the outer mold frame 20, between the outer tank liner plate 10 on both sides of the channel steel 30, and Vertical streaks 31A and 31B protrude from the outer mold 20 respectively.

  As shown in FIG. 3C, which will be described later, a circumferential PC sheath 30A is installed on the grooved steel 30 at a predetermined distance in the height direction. As shown in FIG. 3D to be described later, circumferential streaks 32 and 32 are respectively installed at a predetermined distance in the height direction.

Between the outer tank liner plate 10 and the outer mold frame 20 of the fourth breakwater lot 3D, the concrete 40 is placed in a state where the above-described steel materials 30, 30A, 31A, 31B, 32 are disposed, A fourth breakwater lot 3D among the breakwaters 3 made of prestressed concrete (PC) is formed. Similarly, the first breakwater lot 3A to the third breakwater lot 3C of the breakwater 3 are also formed. Of course, after placing the concrete 40 on the fourth breakwater lot 3D, the first breakwater lot 3A to the fourth breakwater lot 3D are integrated.
For convenience of explanation, a line is provided at each lot boundary in FIG. 1 described above and FIG. 3 (f) described later. However, this line indicates that the breakwater 3 is divided. Absent.

  Next, as shown in FIG. 3B, the outer tank liner plate 10 of the fifth breakwater lot 3E is attached to the crane M (see FIG. 1) at the upper end of the outer tank liner plate 10 of the fourth breakwater lot 3D. ) To connect. This connection operation is performed by a bolt tightening operation using the bolt and nut 14 shown in FIGS. 2 (d) and 2 (e).

  Thereafter, as shown in FIG. 3 (c), the lower end portion of the grooved steel 30 of the fifth breakwater lot 3E is bolted to the upper end portion of the grooved steel 30 of the fourth breakwater lot 3D, and the A plurality of circumferential PC sheaths 30 </ b> A are installed on the grooved steel 30 while maintaining a predetermined distance in the height direction.

  Next, as shown in FIG. 3 (d), vertical streaks 31A and 31B of the fifth breakwater lot 3E are respectively installed at the upper ends of the vertical streaks 31A and 31B of the fourth breakwater lot 3D. Circumferential streaks 32 and 32 are respectively installed on the vertical streaks 31A and 31B while maintaining a predetermined distance in the height direction.

  Further, as shown in FIG. 3 (e), after the steel materials 30, 30A, 31A, 31B, and 32 described above are disposed, the outer mold frame 20 of the fourth breakwater lot 3D is slid upward. The outer mold frame 20 for the fifth breakwater lot 3E is used.

  Then, as shown in FIG. 3 (f), concrete 40 is placed between the outer tank liner plate 10 and the outer mold frame 20 of the fifth breakwater lot 3E. This state is the same as the fourth breakwater lot 3D shown in FIG. Accordingly, the breakwater lot on the fifth breakwater lot 3E is constructed again by repeating FIG. 3 (b) to FIG. 3 (f). By repeating these steps, the breakwater is moved upward. It will build while extending towards.

  The construction method of the tank 1 having the above-described configuration and the outer tank liner plate may use the outer tank liner plate 10 as an inner mold of the liquid breakwater 3 during the construction of each of the above-mentioned breakwater lots 3A, 3B. Since it is possible, there is no need for a new formwork for forming the inner side of the breakwater 3 and no need for a scaffold for a conventional inner formwork. Tank construction can be done in parallel. Therefore, the construction period of the tank 1 can be greatly shortened. For example, the construction period of 4 months can be shortened compared with the conventional method.

  Moreover, the outer tub liner plate 10 is significantly lighter than the conventional precast concrete formwork with the outer tub liner plate, so that it is excellent in handling at the time of construction. The thickness is as thin as about 8 mm, and the outer peripheral angle member 11 and the reinforcing angle member 12 are also several tens of millimeters in height and fit in the reinforcing bar covering of the breakwater, so that the thickness of the breakwater 3 can be increased. There is no effect. Therefore, construction becomes easy, work efficiency improves, and a work period can be shortened.

  In addition, in the construction method of the tank 1 having the above-described configuration, the outer tub liner plate 10 is assembled by bolting using a bolt / nut 14 with a packing material 13 interposed between the outer peripheral angle members 11. Since it is performed, welding work like the conventional outer tank construction becomes unnecessary, and work efficiency can be improved.

  As described above, in the tank construction method and the outer tank liner plate according to the present embodiment, the construction is easy and the construction period can be greatly shortened without increasing the thickness of the breakwater.

As mentioned above, although the construction method of the tank by this invention and embodiment of the outer tank liner plate were demonstrated, this invention is not limited to said embodiment, It can change suitably in the range which does not deviate from the meaning. It is.
For example, in the present embodiment, the example of the tank is an LNG tank, but another tank such as a crude oil tank may be used.
In the present embodiment, the outer peripheral angle member 11 is employed as the outer peripheral support member. However, the present invention is not limited to this, and other steel members such as channel steel can be used as the outer peripheral support member.

  In addition, it is possible to appropriately replace the components in the above-described embodiments with known components without departing from the spirit of the present invention.

1 tank 2 basic version 2A anchor 3 breakwater 3A first breakwater lot 3B second breakwater lot 3C third breakwater lot 3D fourth breakwater lot 3E fifth breakwater lot 10 outer tank liner Plate 11 Angle of outer circumference (outer circumference support)
12 Reinforcing Angle Material 13 Packing Material 14 Bolt / Nut 20 Outer Form 30 30 Channel Steel 30A Circumferential PC Sheath 31A, 31B Vertical Reinforcement 32 Circumferential Reinforcement 40 Concrete F Scaffolding M Crane

Claims (5)

A construction method of a tank constructed by constructing a breakwater on a basic version and providing an outer tank inside the constructed breakwater,
The liquid bank is assembled with an outer tank liner plate that forms the outer tank on the foundation plate as an inner mold frame, and an outer mold frame is assembled with a predetermined interval outside the outer tank liner plate. Build concrete between the assembled outer tank liner plate and the outer formwork ,
The outer tub liner plate is made of a steel plate having a rectangular shape, and an outer peripheral support member is provided on the outer peripheral portion of the steel plate so as to protrude toward the outer side at a predetermined interval, and the outer peripheral support member is a rebar of the concrete. A tank construction method characterized by being housed in a cover. 2. The tank construction method according to claim 1, wherein the outer peripheral support member is assembled in contact with an outer peripheral support member of an adjacent outer tank liner plate.   3. The tank construction method according to claim 2, wherein the outer tank liner plate is assembled by bolting with a packing material interposed between the outer peripheral support members. While constructing a breakwater on the basic version, it is used in the construction method of the tank that is configured by providing an outer tank inside the constructed breakwater,
While being assembled as an inner mold frame, concrete is placed between the outer mold frame and the outer mold frame assembled on the outside to construct the liquid barrier, and the outer tub is formed on the foundation plate An outer tank liner plate for
It consists of a rectangular steel plate, and the outer periphery of the steel plate is provided with an outer peripheral support member at a predetermined interval, and the outer peripheral support member is assembled in contact with an adjacent outer peripheral support member,
The outer periphery support member is provided to protrude toward the outside, and the outer tank liner plate and the inner mold frame are assembled in the state where the outer tank liner plate is assembled as the inner mold frame with a space from the outer mold frame. outer tank liner plate characterized that you have housed in the fog rebar of the concrete which is Da設between.   The outer tub liner plate according to claim 4, wherein a packing material is interposed between the outer peripheral support members and assembled by bolting.

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