JPH0440076Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to the fixing structure of the inner tank material of a low-temperature storage tank in which the outer tank is made of concrete and the inner tank is installed inside it. This is suitable when the inner tank material is composed of a plurality of plate materials, with wide intervals between the expansion joints that are joined to be expandable and contractible.

[Conventional technology]

Liquefied petroleum gas (LPG) and liquefied natural gas (LNG)
For storage of low-temperature liquids, such as above-ground or underground concrete-concrete low-temperature storage tanks, which have an outer tank made of concrete and an inner tank that serves as a pressure vessel installed inside the outer tank, are often used. .

When such an external concrete cryogenic storage tank is made into an above-ground tank, for example, as shown in Fig. 4, a hole of a predetermined size is formed in the ground, and then a foundation 1 made of insulating concrete is laid at the bottom of the hole. At the same time, a temporary formwork for integrally constructing the outer tank 2 is installed on the foundation 1, and concrete is poured into this temporary formwork to construct the concrete wall 3 of the outer tank 2. After removing the formwork, an inner tank 5 is constructed with a heat insulating cold insulating material 4 interposed therebetween.

This inner tank 5 uses, for example, a corrugated connecting material called corrugation as an expansion joint so as to absorb heat shrinkage when a low-temperature liquid is stored inside. They are arranged at regular intervals and constructed by welding and joining the periphery of each inner tank material 6.

[Problem that the invention attempts to solve]

When storing liquefied natural gas (LNG) in an inner tank in which expansion joints are placed at regular intervals left and right, top and bottom, and the inner tank material is welded, the temperature should be around -162°C. Because the temperature is extremely low, the pitch between the left and right sides and top and bottom of the expansion joint must be relatively small, about 2000 mm, but when storing liquefied petroleum gas (LPG), such as propane,
Its temperature is around -45°C, which is closer to room temperature than LNG, making it possible to expand the horizontal and vertical pitch of the expansion joint to around 10 meters.

However, the low-temperature steel materials used for the inner tank material, such as SUS, are available in long lengths, but none with a width of around 10 m, and the inner tank material must be constructed by joining multiple plates. .

In this case, when the inner tank materials are each about 10 m long, the weight increases and how to fix them to the outer tank becomes a new problem.

This idea was made in view of these problems.The inner tank is made up of multiple plates, and each plate can be easily and firmly attached even when the pitch of the expansion joint is large.The outer tank is a concrete low temperature storage tank. The purpose is to provide a fixing structure for the inner tank material.

[Means for solving the problem] This invention is equipped with an inner tank constructed by joining a plurality of inner tank materials together via expansion joints on the four sides around the inner tank material inside the concrete outer tank. In the low-temperature storage tank, the single inner tank material to which the expansion joints are joined on the four peripheral sides is composed of a plurality of strip-shaped plates divided in the vertical direction, and the fixed anchor having a flange surface at the tip is provided as the inner tank material. They are attached to the concrete outer tank at regular intervals in the left and right direction with vertical intervals narrower than the vertical width of the plates, and either the lower edge or the upper edge of the plates are fixed by welding to the flange surfaces of these fixed anchors. , the inner tank material is constructed by overlapping and welding the other end edge to the adjacent plate material.

[Effect]

When the pitch of the expansion joint is large and the inner tank consists of multiple plates, a fixed anchor with a flange surface at the tip is attached to the concrete outer tank, and the lower edge of each plate is attached to this flange surface. The plates are fixed by welding the upper edge of the plate, and the plates are welded one on top of the other, making it possible to attach the plates easily and firmly.

〔Example〕

Hereinafter, one embodiment of this invention will be described in detail based on the drawings.

The inner tank material 6 (see FIG. 4) that constitutes the inner tank 5 of the outer tank concrete low-temperature storage tank is, as shown in FIG. It is sized to fit a pitcher.

The expansion joint 7 to which the peripheral edge of the inner tank material 6 is joined has a corrugated cross-sectional shape consisting of a convex portion having a substantially U-shape and flat plate portions at both ends thereof. This is usually called corrugation.

On the other hand, the fixed anchor 8 used for fixing each of the six plate materials 6a constituting the inner tank material 6 is
As shown in FIG. 3 and FIG. 3, an annular flange portion 8b is integrated with the tip of the bottomed cylindrical portion 8a by welding or the like, and the bolt diameter is larger for inserting the anchor bolt 8c into the bottom portion. A hole 8d is drilled.

As the anchor bolt 8c, a type that can be fixed by driving into a hole formed in the concrete wall 3, or a type that can be buried in advance before pouring concrete is used.

Next, construction of the inner tank 5, which is carried out while fixing each plate member 6a of the inner tank member 6 using such a fixed anchor 8, will be explained.

First, a concrete wall 3 that will become the side wall of the outer tank 2 is constructed together with a foundation 1 laid in a hole formed in the ground (see Fig. 4).

After this, a heat insulating and cold insulating material 4 such as polyurethane foam (PUF) is pasted on the inner peripheral surface of the concrete wall 3, and horizontally In the direction, anchor bolts 8c are inserted at regular intervals (three in Fig. 1).
Drive it through the hole 8d of the bottomed cylindrical part 8a and tighten it with the nut 8e. By this tightening, the heat insulating cold insulating material 4 is fixed in a pressed state by the fixing anchor 8.

After filling the bottomed cylindrical part 8a of the fixed anchor 8 with the heat insulating cold insulating material 4, the plate materials 6a are placed on the surface of the flange part 8b in order from above, and the lower edge A
The contact portion between the annular flange portion 8b and the annular flange portion 8b is fixed by fillet welding (see Fig. 2).

The plate material 6a fixed to the fixed anchor 8 in this way
The upper end of the lower adjacent plate 6a is slightly overlapped with the upper edge B of the upper plate 6a.
A is fillet welded to form a seal, and this process is repeated to join a predetermined number (six in FIG. 1) of plate materials 6a to form an inner tank material 6 of, for example, about 10 m square.

After arranging a predetermined number of inner tank materials 6 on the outer periphery of the concrete wall 3 of the outer tank 2 with the heat insulating and cold insulating material 4 in between in this way, expansion joints 7 are installed between the periphery of each inner tank material 6.
is applied and welded, and the inner tank 5 is completed.

Thereafter, necessary members such as the roof of the outer tank 2 are attached to complete the low temperature storage tank.

When the inner tank material 6 is fixed via such a fixed anchor 8, heat shrinkage occurs when a low-temperature liquid is stored in the inner tank 5, but the anchor bolt 8c of the fixed anchor 8 is inserted into the large diameter hole 8d. By filling the periphery of the bottomed cylindrical portion 8a with a cushion material such as glass wool, the inner tank material 6 is allowed to move slightly even when the anchor bolt 8c is fixed, thereby reducing stress. Concentration is prevented.

In addition, instead of the large-diameter hole 8d, there is a
A gap may be formed and a cushioning material such as glass wool filled therein so that the fixed anchor 8 can be moved by this gap, and the anchor bolt 8c may be deformed to absorb heat shrinkage. Furthermore, the upper edge of the plate may be fixed to the flange portion, and the overlapped lower edge may be welded to the plate.

Further, the shape of the fixed anchor, particularly the flange portion, is not limited to that of the above embodiments, but can be made into various shapes.

[Effect of the invention]

As specifically explained above in conjunction with the embodiments, according to this invention, the lower end of the plate of the inner tank consisting of a plurality of plates is attached to the concrete outer tank via a fixed anchor having a flange surface at its tip. Since the edges are welded, it is easy to fix the plate material and it is strong.

Therefore, it is effective when the pitch of the expansion joint is large and cannot be handled with a single inner tank material, and the low temperature storage tank is equipped with a pitch expansion joint that matches the amount of shrinkage depending on the temperature of the stored low temperature liquid. can be easily constructed.

Furthermore, the heat insulating and cold insulating material interposed between the concrete wall and the inner tank material can also be fixed using the fixed anchor.

[Brief explanation of the drawing]

Figures 1 to 3 show one embodiment of the fixing structure for the inner tank material of the outer concrete cryogenic storage tank of this invention, with Figure 1 being a front view of the fixed state, and Figures 2 and 3 showing fixed anchors. Perspective and cross-sectional views of 4th
The figure is a sectional view of an example of an object to which this invention is applied. 1...Foundation, 2...Outer tank, 3...Concrete wall, 4...Insulating cold insulation material, 5...Inner tank, 6...Inner tank material, 6a...Plate material, 7...Expansion joint, 8... ...Fixed anchor, 8a...Cylindrical part with bottom, 8b...Flange part, 8c...Anchor bolt, 8d...Large diameter hole, 8e...Nut, A...Lower edge, B...Top edge .

Claims (1)

[Scope of utility model registration request] In a low-temperature storage tank that includes an inner tank constructed by joining a plurality of inner tank materials to each other via expansion joints on the four peripheral sides of the inner tank material in a concrete outer tank, the expansion joints are joined to the four peripheral sides. The single inner tank material is composed of a plurality of strip-shaped plates divided in the vertical direction, and fixed anchors with flange surfaces at the tips are attached to the concrete outer tank at vertical intervals narrower than the vertical width of the plate materials. Installed at regular intervals in the left and right direction,
Either the lower end edge or the upper end edge of the plate material is welded and fixed to the flange surface of these fixed anchors, and the other end edge is overlapped and welded to the adjacent plate material to form the inner tank material. A fixing structure for inner tank material of an outer tank concrete low-temperature storage tank characterized by comprising: