JP2005280837A - Structure of vertically steel cylindrical liquid storage tank - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To take a measure to prevent large scale sloshing phenomenon which occurs in a large liquid storage tank and becomes a factor of disaster when huge earthquake occurs. <P>SOLUTION: An arbitrary number of partition walls of arbitrary shape having flow holes through which liquid freely moves are installed in the large liquid storage tank and a tank body is vertically divided and multi-layered, so that a floating roof or a floating lid instead of the floating roof is miniaturized and the weight is reduced by prevention of the large scale sloshing phenomenon to become the factor of the disaster and the multi-layered tank body. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

Technology field

  The present invention has been devised for the purpose of preventing the occurrence of large-scale liquid sloshing (sloshing) caused by resonance with long-period ground motion when a large earthquake occurs, and preventing leakage and fire of the stored liquid. The present invention relates to a vertical steel cylindrical liquid storage tank.

A conventional vertical steel cylindrical liquid storage tank is a single tank type that is not divided by a partition wall regardless of the type of storage liquid and the size of the tank. For this reason, when a large earthquake occurred, the liquid in the tank became larger in inner diameter and an unusually large sloshing often occurred due to resonance with long-period ground motion. In particular, the floating roof provided on the liquid level as a countermeasure against disasters and evaporation of the liquid adheres to the liquid level and follows, so as the slanting of the liquid level increases due to sloshing, the gap with the tank side wall increases. In some cases, liquid overflowed on the floating roof, or one end of the inclined floating roof crossed the upper end of the tank side wall, and liquid overflowed to the outside from this gap. As the contact area with the air increases, in the case of highly flammable liquids, it may be caused by sparks due to contact between the tank side wall and the floating roof, static electricity generated due to the outflow of liquid, or high temperature around the tank. There was a case that caused a catastrophe that caused a fire to become impossible to extinguish.
This not only wasted valuable resources, but also caused serious harm to environmental problems.

In conventional single tank tanks, as the tank becomes larger and the inner diameter increases, the integrated floating roof body also becomes larger and receives huge external force due to large-scale sloshing. It was. In addition, it was necessary to take measures to treat rainwater collected on the floating roof.
JP 08-119383 A JP 2000-128281 A JP 2001-048286 A

The problem to be solved is that it was not possible to take measures to prevent the occurrence of a large-scale sloshing phenomenon that occurred in the storage tank and caused a disaster when a huge earthquake occurred.
[Means for solving the problems]

  The main feature of the present invention is that a partition wall having a flow hole in which liquid can freely move is installed in the storage tank, and the tank body is divided into multiple tanks in the vertical direction to prevent the occurrence of an abnormally large sloshing phenomenon. And

  The partition wall with flow holes according to the present invention makes the liquid in the tank multi-tank and divides and reduces its surface area, and prevents the occurrence of large-scale sloshing phenomenon by preventing resonance action with long-period ground motion when a huge earthquake occurs In addition, the partition wall around the flow hole attracts the time lag of the liquid flow between the storage tanks, eliminating the large-scale sloshing seen in the single tank type tank and preventing the occurrence of disasters in advance. . This can contribute to the preservation of valuable liquid resources, disaster prevention and environmental protection.

  Since an intermediate support column for supporting the reinforcing girder of the fixed roof can be installed using the partition wall, the fixed roof can be reduced in weight and made into an inexpensive structure.

  When a fixed roof is provided, the floating lid provided exclusively for preventing liquid evaporation instead of the floating roof is reduced in size by the partition wall and released from sloshing, so that no rainwater prevention measures are required. Simple and inexpensive structure.

  The purpose of preventing the occurrence of abnormally large sloshing phenomenon and preventing disasters in the event of a huge earthquake was realized by installing a partition wall with flow holes in the tank.

  Since an intermediate support column that supports the reinforcement girder of the fixed roof for rainwater and snow cover protection can be installed, the weight of the entire roof can be reduced.

  The floating lid provided for the purpose of preventing the evaporation of the liquid is reduced in size by the partition wall, and the influence of sloshing is almost eliminated, so that the weight is reduced and the cost is reduced.

  FIG. 1 is a perspective view showing a structure related to a partition wall in which a part of an outer wall of a tank according to one embodiment of the present invention is deleted, as viewed from the AA direction in FIG.

  FIG. 4 shows one embodiment of the floating lid of the present invention. Since this floating lid is prevented from entering rainwater and snow by a fixed roof and is released from sloshing by a partition wall, it can be made a simple structure as seen in the figure.

  As shown in FIGS. 1 to 3, the partition wall can be easily added to the existing single tank type tank. In addition, the above-mentioned fixed roof and floating lid can be provided at a lower cost and at a lower cost than those of conventional single tank tanks, and can contribute to the conservation of valuable resources, the prevention of disasters, and the protection of the environment.

  It is the perspective view which showed the structure relevant to the partition wall which deleted a part of tank outer wall seen from the AA direction of FIG. (Example 1)   Plan view   AA sectional elevation view of FIG.   End cross-sectional diagram of floating lid (Example 2)

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Tank side wall 2 Storage tank 3 Partition wall 4 Flow hole 5 Floating lid 5a Flexible sheet support floating body 5b Magnet sheet 5c Evaporation prevention flexible sheet 6 Fixed roof 7 Fixed roof reinforcement 8 Support pillar

Claims (1)

  In the liquid storage tank, the single tank type tank body is divided into multiple tanks by dividing it vertically with an arbitrary number / arbitrary shaped partition wall with flow holes of arbitrary number / arbitrary shape that allows the stored liquid to freely flow. Structure of a vertical steel cylindrical liquid storage tank with a built-in storage tank.

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