JP2014069844A - Protective measure of flat-bottomed cylindrical tank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide protective measures of a flat-bottomed cylindrical tank that prevent a flat-bottomed cylindrical tank of a small scale installed on the ground from vibrating, rocking, sliding, buckling and overturning due to an earthquake and from floating off and flowing away with a tsunami or floodwater at the time of a disaster such as an earthquake, a tsunami, strong wind or flooding.SOLUTION: In order to prevent a flat-bottomed cylindrical tank of a small scale installed on the ground from damage to side plates or a bottom plate due to vibration and rocking at the time of an earthquake and from floating off and flowing away with a tsunami or floodwater, the flat-bottomed cylindrical tank is formed and fixed by providing protective measure members consisting of a band-plate like anchor strap from a lower part outer peripheral surface of the side plates of the tank to a base slab, and a base fixation part, or by providing protective measure members consisting of a block material fastened to the lower part outer peripheral surface of the side plates of the tank, and a mooring material reaching an anchor set up on the ground.

Description

  The present invention provides a flat-bottomed cylindrical tank that prevents a small-sized flat-bottomed cylindrical tank from slipping or rocking or overturning due to an oscillation caused by an earthquake, and that is stably fixed so as not to be lifted or washed away by a tsunami. Concerning protection measures.

As shown in FIG. 6, a conventional small-sized flat bottom cylindrical tank 1 having a capacity of about 1,000 kl or less includes a side plate 2, a bottom plate 3, and a roof 4, and is placed on a base plate on the ground 11. .
The tank 1 may float up from the base plate of the ground 11 due to a tsunami or flood 10, or the upper part of the Talay around the bottom plate 3 may buckle due to an earthquake.

  The invention of Japanese Patent Laid-Open No. 63-147498, “Slip-stopping device for flat bottom cylindrical storage tank”, describes the lower edge of the side plate of the storage tank so as not to restrain the movement in the vertical direction parallel to the axis of the storage tank in the event of an earthquake. The structure of the anti-slip device engaged between a bracket fixed in the vicinity and an anchor provided on the foundation is disclosed.

  The invention of Japanese Patent Application Laid-Open No. 11-49283 of “Patent Document 2” discloses a storage tank that restrains horizontal movement without restraining vertical movement of the storage tank during an earthquake or strong wind. The structure of the anti-skid apparatus which directly or indirectly connected the bottom plate of this to the buried anchor of the storage tank foundation is disclosed.

In the invention of Japanese Patent Application Laid-Open No. 2007-270864 of “Patent Document 3”, “Cryogenic Liquefied Gas Storage Facility and Anchor Strap Installation Method”, a metal inner tank 11 is installed inside the metal outer tank 7, and the inner tank 11 Is a low-temperature liquefied gas storage facility in which the metal anchor strap 18 that prevents the movement of the metal strap is fixed to the base, and the anchor strap 18 is a metal material having a larger linear expansion coefficient than the metal material forming the inner tank 11. The structure formed by is disclosed.

Japanese Utility Model Publication No. 63-147498 Japanese Patent Laid-Open No. 11-49283 JP 2007-270864 A

As shown in FIG. 6, a conventional small flat-bottomed cylindrical tank 1 that is stationary on the ground is such that the tank 1 is lifted or washed away from the base plate of the ground 11 due to a disaster such as a tsunami or flood 10. I was worried about being damaged. In particular, when the amount of stored liquid is as small as 20% or less, it has been reported that even a relatively shallow flood or tsunami with an inundation depth of about 3 m is susceptible to damage such as floating and running.
Further, damage cases such as sliding of the tank 1 due to an earthquake and falling due to rocking, or buckling of the upper part of the talai from the lower part of the side plate 2 to the periphery of the bottom plate 3 have been reported.

  The invention of the “slide prevention device for a flat bottom cylindrical storage tank” of Patent Document 1 is an apparatus that prevents lateral slippage of the storage tank due to an earthquake or strong wind. However, excessive stress is applied to the side plate of the portion that attaches and fixes the slip prevention apparatus to the storage tank. It may occur and damage the tank body instead. In addition, if the depth of water immersion is deep and the floating amount of the storage tank becomes large, it may be detached from the anti-slip device, which is not sufficient to prevent the tsunami or flood from being lifted or washed away.

  The anti-sliding device disclosed in the invention of the “storage tank anti-skid device” of Patent Document 2 and directly or indirectly connecting the bottom plate of the storage tank to the embedded anchor of the storage tank foundation has a certain effect in preventing sliding in a strong wind. However, it is not sufficient as a measure to prevent the rocking and rocking of the tank due to a large earthquake and to prevent the tank from being lifted and washed away by the tsunami.

  The anchor strap shown in Patent Document 3 “Cryogenic Liquefied Gas Storage Facility and Anchor Strap Installation Method” is intended to prevent sliding and locking of the tank in the cryogenic tank, and is used to constantly apply tensile stress to the anchor strap. It is related to the yield strength and installation method of the anchor strap, and is not intended to prevent the tank from being lifted or washed away by the tsunami.

The present invention has been made in view of the above-described problems of the prior art. The purpose of the present invention is to provide a small flat-bottom cylindrical tank that is stationary on the ground in the event of a disaster such as an earthquake, tsunami, strong wind, or flood. It is intended to provide protection measures for flat bottom cylindrical tanks that prevent rocking and rocking due to earthquakes, sliding and buckling, falling down, and floating and drifting due to tsunami and flooding.

  The protection measures for the flat bottom cylindrical tank according to the invention of claim 1 are to prevent a small flat bottom cylindrical tank standing on the ground from being lifted or washed away by side plates or bottom plates due to rocking or rocking during an earthquake, tsunami or flood. In order to prevent this, a protective measure member consisting of an anchor strap in the form of a strip plate extending from the outer peripheral surface of the lower side plate of the tank to the base plate and a base fixing part is provided or fixed, or a block fixed to the outer peripheral surface of the lower side plate of the tank It is characterized in that a protective measure member comprising a material and a mooring material reaching an anchor installed on the ground is provided and fixed.

  According to a second aspect of the present invention, there is provided a protection member according to the first aspect of the invention, wherein the band-like anchor strap according to the first aspect has a structure in which the corner edge of the upper end portion of the anchor strap is rounded. A smooth surface member is constructed in a range where the upper end of the anchor strap on the surface of the backing plate abuts, and elastically applied to the lower end edge of the locking member fixed to the outer side of the upper end of the anchor strap. It is characterized in that the member is fixedly formed.

According to a third aspect of the present invention, there is provided a protective measure member, wherein the band-plate-shaped anchor strap according to the first or second aspect is formed of a metal member having a yield point lower than that of the tank side plate and having a large elongation deformation performance. To do.

  The protection measures for the flat bottom cylindrical tank according to the invention of claim 1 are to prevent a small flat bottom cylindrical tank standing on the ground from being lifted or washed away by side plates or bottom plates due to rocking or rocking during an earthquake, tsunami or flood. In order to prevent this, a protective measure member consisting of an anchor strap in the form of a strip plate extending from the outer peripheral surface of the lower side plate of the tank to the base plate and a base fixing part is provided or fixed, or a block fixed to the outer peripheral surface of the lower side plate of the tank Since the protective measures member consisting of the material and the anchoring material leading to the anchor installed on the ground is provided and fixed, the outer peripheral surface of the lower side plate is protected by reinforcement and fixed to the base plate in a connected state. There is no buckling or damage to the Tarai area from the lower part to the periphery of the bottom plate, and the tank is not lifted or washed away. Further, the tank side plate is fixed to the base plate in a connected state with the tensile force of the band-like anchor strap, and the side plate outer peripheral surface and the periphery are protected. Further, the outer peripheral surface of the side plate and the vicinity of the outer peripheral edge of the bottom plate are reinforced and protected by the block material, and the tank side plate can be securely fixed to the anchor by the anchoring material.

According to a second aspect of the present invention, there is provided a protection member according to the first aspect of the invention, wherein the band-like anchor strap according to the first aspect has a structure in which the corner edge of the upper end portion of the anchor strap is rounded. A smooth surface member is constructed in a range where the upper end of the anchor strap on the surface of the backing plate abuts, and elastically applied to the lower end edge of the locking member fixed to the outer side of the upper end of the anchor strap. Since the member is fixed, when the uplift force is applied to the tank side plate and the tensile force is applied to the anchor strap, the anchor strap upper end is prevented from receiving an excessive load. it can.
In addition, an elastic member is interposed between the locking member and the fixing member to provide a flexible structure, so that an uplift force acts on the tank side plate and a tensile force acts on the anchor strap. Variation and impact can be absorbed by the contraction.

Since the protection measure member of claim 3 is formed of a metal plate having a lower yield point and a larger elongation deformation performance than the material of the tank side plate, the band plate-like anchor strap of claim 1 or 2 is formed.
The anchor strap stretches and absorbs energy against the tensile load, and when a load exceeding a predetermined level is applied, the anchor strap breaks before the side plate, resulting in a seismic isolation effect and damage to the side plate during an earthquake. Protected without doing.

It is a whole side explanatory view showing the 1st example of an embodiment of protection measures of a flat bottom cylindrical tank concerning the present invention. It is whole side explanatory drawing which shows the 2nd Example of a protective measure of a flat bottom cylindrical tank. It is a perspective explanatory view which shows the installation condition of the protection countermeasure member of FIG. It is side surface explanatory drawing which shows the whole anchor strap. (A) which shows the upper part vicinity of an anchor strap is side explanatory drawing, (B) is front explanatory drawing. It is whole side explanatory drawing which shows the damage condition by the tsunami of the flat bottom cylindrical tank of the ground installation of a prior art example.

  Embodiment examples of the protective measures for the flat bottom cylindrical tank according to the present invention will be described with reference to FIGS. The present invention is not limited only to the following embodiments. It goes without saying that changes (for example, omission or addition of components, changes in the shape of components, etc.) can be added to the following embodiments without departing from the gist of the present invention. In addition, the figure shows the outline and the detailed structure and description are partially omitted.

FIG. 1 is an overall side view illustrating a first embodiment of protective measures for a flat bottom cylindrical tank.
The tank 1 is a small flat-bottom cylindrical structure having a capacity of about 1,000 kl or less, which includes a side plate 2, a bottom plate 3, and a roof 4, and is installed on a base plate 5 formed higher than the ground 11.
The tank 1 is separated from the side plate 2 at a predetermined height in the circumferential direction so that the tank 1 will not skid due to an uplift force caused by rocking or rocking during an earthquake, or may be lifted and washed away by a tsunami or flood. A protective measure member 6 comprising a side plate attaching portion 8 installed in a base plate, a base fixing portion 9 installed in the base plate 5, and an anchor strap 7 connecting both of them is provided.

FIG. 2 is an overall side view illustrating a second embodiment of a protective measure for a flat bottom cylindrical tank.
The tank 1 is a small flat-bottom cylindrical structure having a capacity of about 1,000 kl or less, which includes a side plate 2, a bottom plate 3, and a roof 4, and is installed on a base plate 5 higher than the ground 11.
Anchors 12 installed around the base plate 5 are separated so that the tank 1 does not skid by an uplift force caused by rocking or rocking during an earthquake, or lifted or washed away by a tsunami or flood. And a protection member 6 comprising a block member 13 fixed to cover a predetermined height position of the outer peripheral surface of the side plate 2 of the tank 1 and a mooring member 14 for connecting the anchor 12 and the block member 13 to each other. .

  The block member 13 is formed of a member having a large specific gravity combining a steel plate, concrete, synthetic resin material, etc., and covers a predetermined height position of the outer peripheral surface of the side plate 2 to prevent an impact caused by a tsunami wave force or an outflow. As described above, a plurality or a ring is continuously arranged at a predetermined interval at a position from the lower predetermined range of the side plate 2 to the vicinity of the outer periphery of the bottom plate 3 around the talai.

  The side plate 2 of the tank 1 is covered at a predetermined height by the protection member 6 shown in FIGS. 1 and 2 and is connected to the base plate 5 so that the tank 1 is swung or locked by an earthquake. Even if it is not slid or overturned, the upper part of the talai from the lower part of the side plate 2 to the periphery of the bottom plate 3 is not damaged or buckled by the earthquake. In addition, when the liquid storage amount is as small as about 20% to 30% or less, even if it receives a tsunami or is immersed in water of about 1 m to 3 m or less, it will not float or be washed away.

FIG. 3 is a perspective explanatory view showing an installation state of the protection member 6 of FIG.
The anchor strap 7 serving as the protective measure member 6 is formed of a strip having a large cross-sectional area (good cross-sectional performance) and a large thickness and a wide width. Install.

The side plate attaching portion 8 that locks the upper end portion of the anchor strap 7 protects the lower portion of the wide side plate 2 with the backing plate 8A, and prevents local force from being applied to the side plate 2 to prevent cracking and buckling. Plan.
The pad plate 8A and the strip-shaped anchor strap 7 cover a wide range from the periphery of the bottom plate outer peripheral edge 3A obliquely above to the upper part of the side plate 2 lower part of the talai. The lower part of the side plate 2 is protected from the impact caused by

FIG. 4 is an explanatory side view showing the entire anchor strap 7. The tank 1 is composed of a side plate 2 and a bottom plate 3 and is installed on a base plate 5.
The anchor strap 7 is installed so as to be inclined so as to pass through the anchor box 7A from the side plate attaching portion 8 locked to the contact plate 8A on the outer peripheral surface of the side plate 2 and reach the base fixing portion 9 of the base plate 5.

FIGS. 5A and 5B are explanatory views viewed from the side and the front, showing the vicinity of the side plate attaching portion 8 in the upper part of the anchor strap 7 of FIG.
A contact plate 8A is welded to the upper outer peripheral surface of the side plate 2, and the side plate attachment portion 8 is provided on the upper surface of the contact plate 8A. Mounting plates 8a and 8a are provided on both side surfaces of the side plate mounting portion 8 so as to stand in parallel. The mounting plates 8a and 8a are inclined at a predetermined distance from the abutting plate 8A. The fixing material 8b to be passed is fixed.
The upper end portion 7a of the anchor strap 7 installed in an inclined manner is slidably inserted into the gap between the abutting plate 8A and the fixing member 8b without being fixed to the side plate attaching portion 8, and fixed to the outside of the upper end portion 7a. The lower end edge of the stopper 7b is hooked and locked.

The corner edge of the upper end portion 7a of the anchor strap 7 is formed so as to be in smooth contact with the surface of the contact plate 8A of the side plate 2 as a rounded structure.
Further, the smooth member 8c is applied in a range where the upper end portion 7a of the anchor strap 7 contacts the surface of the contact plate 8A of the side plate 2.
In this way, the corner edge of the upper end portion 7a of the anchor strap 7 is rounded, and the smooth surface member 8c is provided at the contact portion in a range where the upper end portion 7a of the anchor strap 7 contacts, so that the tank 1 can be used normally. When the upper lift 7a of the anchor strap 7 slides due to the uplift force F1 acting on the tank side plate 2 or the tensile force F2 acting on the anchor strap 7, Can do.

Furthermore, the elastic member 7 c is fixed to the lower end edge of the locking member 7 b fixed to the outer side of the upper end of the anchor strap 7. As the elastic member 7c, a member having elasticity and durability such as a synthetic rubber material such as nitrile rubber or silicone rubber is used.
As described above, the elastic member 7c is interposed between the locking member 7b and the fixing member 8b so as to have a flexible structure, so that the uplift force F1 acts on the tank side plate 2 during normal use of the tank 1, When a tensile force F2 is applied to the anchor strap 7, fluctuations and impacts due to F1 and F2 can be absorbed by the contraction with elasticity of the elastic member 7c.

The anchor strap 7 is formed of a member having a low yield strength, that is, a member having a yield point smaller than that of the side plate 2 and a member having a low yield ratio.
For example, when the side plate 2 uses a high-tensile steel material of 50 kg class, a metal member having a low yield point and high elongation deformation performance such as mild steel and low yield point steel is used.
Thus, by forming the anchor strap 7 with a metal member having a yield point lower than that of the side plate 2 and having a large elongation deformation performance, a load exceeding a predetermined level caused by an earthquake, tsunami, flood, etc. Absorption can be mitigated by the yielding of the anchor strap 7 at an earlier stage. That is, since the anchor strap 7 has a low stress and a large strain, the anchor strap 7 absorbs energy and obtains a seismic isolation effect within a period when the load is applied.
Further, when an excessive load more than a predetermined value is applied to the anchor strap 7, a large load is not transmitted to the tank side plate 2 by breaking beyond the yield point of the anchor strap 7 member. Will no longer be damaged and lead to catastrophes.

The above-mentioned protective measures are not only applied to flat-bottomed cylindrical tanks that are stationary on the ground, but also to improve the seismic performance of tanks in the event of an earthquake, especially for storage facilities and small scales where protection measures against external tsunamis and flood disasters are desired. It can also be applied to structures.

1 tank
2 side plate
3 bottom plate
3A bottom plate outer periphery
4 roofs
5 editions
6 Protection measures
7 anchor strap
7A anchor box
7a upper end
7b locking material
7c elastic member
8 side plate mounting part
8A batting plate
8a mounting plate
8b fixing material
8c smooth surface member
9 base fixing part
F1 uplift force
F2 tensile force
10 Tsunami and flood
11 ground
12 anchors
13 blocks
14 Mooring material

Claims (3)

  In order to prevent small flat-bottomed cylindrical tanks that are stationary on the ground from being damaged by sideways and bottom plates due to rocking and rocking during earthquakes, and from being lifted and washed away by tsunamis and floods, they are transferred from the outer periphery of the bottom side plate of the tank to the base plate. A protective measure member consisting of a strip-shaped anchor strap and a base fixing portion is provided and fixed, or a protection consisting of a block material fixed to the outer peripheral surface of the lower side plate of the tank and a mooring material reaching the anchor installed on the ground Protective measures for flat bottom cylindrical tanks, characterized by providing countermeasure members and fixing them.   The band-like anchor strap of the protective measure member is formed so that the upper end corner edge of the anchor strap is rounded so as to smoothly contact the surface of the backing plate fixed to the side plate. A smooth surface member is constructed in a range where the upper end portion of the anchor strap contacts the surface of the anchor strap, and an elastic member is fixed to the lower end edge of the locking member fixed to the outer side of the upper end of the anchor strap. Protection measures for flat bottom cylindrical tank. 3. The flat bottom cylinder according to claim 1, wherein the protective measure member is formed of a metal plate having a lower yield point and a larger elongation deformation performance than the material of the tank side plate. Tank protection measures.

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