JP6112443B2 - Protection structure for flat bottom cylindrical tank - Google Patents

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. It relates to a protective measure structure .

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. Et al is deeply flooded deep, if the reservoir flying height is increased, may deviate from the slip device is also considered not sufficient to prevent being lifted Ya flowed tsunami and floods.

  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. , is to provide earthquake by swinging and rocking, sliding and buckling, or fall, the protection structure of the flat-bottomed cylindrical tank to prevent the lifting and flowed by the tsunami and floods.

The flat bottom cylindrical tank protection structure according to the invention of claim 1 is such that a small-sized flat bottom cylindrical tank standing on the ground is lifted or washed away by side plate or bottom plate damage caused by rocking or locking during an earthquake, tsunami or flood. In order to prevent this, the protection of a flat bottom cylindrical tank formed by fixing a protective measure member consisting of a band plate-shaped anchor strap extending from the outer peripheral surface of the lower side plate of the tank to the base plate, a mounting portion and a base fixing portion In the countermeasure structure, there is a structure of the contact plate welded to the outer peripheral surface of the side plate and the mounting portion provided on the surface thereof, and the mounting portion is perpendicular to the surface of the contact plate and is erected in parallel with each other 2 and sheets of the mounting plate, the mounting plates of the fitted in the lower position, and a fixed member which is inclined at a predetermined distance from said backing plate secured to the mounting plates, the anchor Stora of the wear plate surface The upper end of the anchor strap is inserted into the gap between the abutting plate and the fixing member without being fixed to the mounting portion. And a structure in which the lower end edge of the locking member fixed to the outside of the upper end portion of the anchor strap is hooked and locked, and a resilient member is fixed to the lower end edge of the locking material , and the anchor strap Is characterized in that it is a metal member having a lower yield strength and a larger elongation deformation performance than the side plate .

The flat bottom cylindrical tank protection structure according to the invention of claim 1 is such that a small-sized flat bottom cylindrical tank standing on the ground is lifted or washed away by side plate or bottom plate damage caused by rocking or locking during an earthquake, tsunami or flood. In order to prevent this, the protection of a flat bottom cylindrical tank formed by fixing a protective measure member consisting of a band plate-shaped anchor strap extending from the outer peripheral surface of the lower side plate of the tank to the base plate, a mounting portion and a base fixing portion In the countermeasure structure, there is a structure of the contact plate welded to the outer peripheral surface of the side plate and the mounting portion provided on the surface thereof, and the mounting portion is perpendicular to the surface of the contact plate and is erected in parallel with each other 2 and sheets of the mounting plate, the mounting plates of the fitted in the lower position, and a fixed member which is inclined at a predetermined distance from said backing plate secured to the mounting plates, the anchor Stora of the wear plate surface The upper end of the anchor strap is inserted into the gap between the abutting plate and the fixing member without being fixed to the mounting portion. And a structure in which the lower end edge of the locking member fixed to the outside of the upper end portion of the anchor strap is hooked and locked, and a resilient member is fixed to the lower end edge of the locking material , and the anchor strap Since this is a metal member having a lower yield strength and greater elongation deformation performance than the side plate, the outer peripheral surface of the lower side plate is reinforced and protected and fixed in a connected state to the base plate. There is no buckling or damage of the surrounding parts, 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. When an uplift force is applied to the tank side plate and a tensile force is applied to the anchor strap for sliding, it is possible to prevent an excessive load from being applied to the contact portion of the upper end of the anchor strap. In addition, when an elastic member is interposed between the locking material and the fixing material to create a flexible structure, an uplift force is applied to the tank side plate during normal operation of the tank, and a tensile force is applied to the anchor strap. The fluctuations and impacts caused by the uplift force and the tensile force can be absorbed by the elastic contraction of the elastic member. In this way, by forming the anchor strap with a metal member that has a lower yield point than the material of the side plate and has a large elongation and deformation performance, loads exceeding a predetermined level due to earthquakes, tsunamis, floods, etc. are earlier than buckling of the side plate. Absorption can be mitigated by the yielding of the anchor strap. That is, since the anchor strap has low stress and large strain, the anchor strap absorbs energy and obtains a seismic isolation effect within a period when the load is applied. In addition, when an excessive load is applied to the anchor strap, the tank strap will be damaged because the large load will not be transmitted to the tank side plate by breaking beyond the yield point of the anchor strap member. It will not lead to a major disaster.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an overall side view illustrating a first embodiment of a protective countermeasure structure for a flat bottom cylindrical tank according to the present invention. It is a whole side surface explanatory view showing the example of a 2nd embodiment of protection measure structure of a flat bottom cylindrical tank. It is a perspective explanatory view which shows the installation condition of the protection countermeasure structure 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.

An embodiment of a protective structure for a 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 a protective measure structure 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. In this structure, a protective measure member 6 including a mounting portion 8 installed in a base plate 5, 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 the protective measure structure 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. Structure .

  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. The anchor strap 7 is separated from the outer peripheral surface of the side plate 2 of the tank 1 by a plurality of distances. Install.

The attachment portion 8 that locks the upper end portion of the anchor strap 7 protects the lower portion of the side plate 2 in a wide range with the contact plate 8A, and prevents local force from being applied to the side plate 2 to prevent cracking and buckling. .
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 to be inclined so as to pass through the anchor box 7A from the attachment portion 8 provided on the surface of the contact plate 8A welded to the outer peripheral surface of the side plate 2 and to reach the base fixing portion 9 of the base plate 5. Structure .

5 (A) and 5 (B) are explanatory views seen from the side and front, in which the vicinity of the attachment portion 8 is enlarged and shown in the upper part of the anchor strap 7 of FIG.
Welded caul plate 8A to the outer peripheral surface of the side plate 2, a structure in which the mounting portion 8 on the front surface of the backing plate 8A. The mounting portion 8 has a structure in which two mounting plates 8a and 8a are provided vertically and parallel to the surface of the abutting plate 8A, and are fitted at a lower position between the mounting plates 8a and 8a . and a is inclined at a predetermined distance from the wear plate 8A to fix the fixing member 8b between the mounting plate 8a, 8a structure.
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 mounting portion 8 , and is fixed to the outer side of the upper end portion 7a. A structure in which the lower end edge of the material 7b is hooked and locked is adopted.

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 protection structure is not only used for flat-bottomed cylindrical tanks that are stationary on the ground, but also for storage and small scales where it is desired to improve the seismic performance of the tank in the event of an earthquake, especially to protect against external tsunamis and flood disasters. It can also be applied to other constructions.

1 tank 2 side plate 3 bottom plate 3A bottom plate outer periphery 4 roof 5 base plate 6 protection measures member 7 anchor strap 7A anchor box 7a upper end portion 7b locking material 7c elastic member 8 mounting portion 8A contact plate 8a mounting plate 8b fixing material 8c smooth surface Member 9 Base fixed part F1 Uplift force F2 Tensile force 10 Tsunami and flood 11 Ground 12 Anchor 13 Block material 14 Mooring material

Claims (1)

In order to prevent small flat-bottomed cylindrical tanks that are stationary on the ground from being swung or rocked during earthquakes, damage to side plates and bottom plates, and tsunamis and floods from floating and being washed away, the bottom side plates of tanks are used as the base plate. In the protection structure of a flat bottom cylindrical tank formed so as to be fixed by providing a protective measure member consisting of a strip-shaped anchor strap, a mounting portion and a base fixing portion, and a contact plate welded to the outer peripheral surface of the side plate and its surface The mounting portion is provided on the mounting plate, and the mounting portion is fitted to two mounting plates that are perpendicular to the surface of the abutting plate and parallel to each other, and a lower position between the mounting plates. is allowed, and from the backing plate and is inclined at a predetermined distance fixing member which is fixed to the mounting plates, the upper end of the anchor straps of the wear plate surface with a smooth member in a range in contact with the structure The upper end portion of the anchor strap is slidably inserted into the gap between the backing plate and the fixing material without being fixed to the mounting portion, and the lower end edge of the locking material fixed to the outside of the upper end portion of the anchor strap The anchor strap is a metal member having a lower yield strength and a higher elongation deformation performance than the side plate, and is a structure in which a resilient member is fixed to the lower end edge of the locking member. protection structure of a flat-bottomed cylindrical tank, characterized in that.

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