JP2019001469A - Outdoor tank sideslip prevention measure and structure thereof - Google Patents

Abstract

To provide an outdoor tank sideslip prevention measure and structure thereof with increased sideslip resistance of an outdoor tank when a flood or the like occurs due to tsunami and high tide water.SOLUTION: The outdoor tank sideslip prevention measure is to prevent an outdoor tank 10 from being slid by the wave power when a flood occurs. A wall 15 is built to surround the outdoor tank, and a base plate 11 of the outdoor tank and the wall are connected to form interspace 20 between the side plate of the outdoor tank and the wall. Multiple water inlets 17 are arranged in the wall. When a flood occurs, water flows in the interspace through the water inlets and/or over the wall, and the apparent weight of the tank increases due to the water in the interspace, which increases sideslip resistance of the outdoor tank against the wave power.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an outdoor tank sliding prevention method and structure for preventing sliding of an outdoor tank during flooding.

  As shown in Fig. 9, the basic structure of the outdoor tank that stores liquids of dangerous materials that may ignite etc. is classified into three categories: (a) RC ring foundation, (b) pile foundation, and (c) slab foundation. Is done. The RC ring foundation shown in FIG. 9 (a) is a foundation type composed of an RC ring arranged on the outer side of the tank and a bank reinforced by a crushed stone ring directly under the tank side plate. The pile foundation in FIG. 9 (b) is a foundation type that transmits tank load to the ground via RC slabs and piles. The slab foundation in FIG. 9C is a foundation structure in which the pile is removed from the pile foundation.

  The outdoor tank is made of a thin steel plate and is a very flexible structure. When the content liquid acts on the tank bottom plate, the base is desired to have a structure adapted to some degree of deformation in order to allow the bottom plate and the top surface of the base to be in close contact with each other. Therefore, the portion where the tank and the foundation are in contact with each other is not a very rigid concrete slab, but is provided with a compacted crushed stone layer or sand layer that serves as a buffer layer that can follow the deformation of the tank bottom plate. In any of the basic types, asphalt protection measures for the tank bottom plate, asphalt sand with a thickness of about 5 to 10 cm (asphalt mixed mainly with sand and stone powder) is laid on the upper surface of the foundation.

  According to a report from the Fire and Disaster Management Agency (Non-patent Document 1) issued in 2009, the side tank seats caused by floating, sliding, falling, and internal / external water pressure differences in outdoor tanks caused by flooding caused by storm surges and tsunami caused by earthquakes The bottom plate slips out due to bending and tilting, and side plate buckling due to tilting is mentioned, but among these, sliding is most likely to occur, and if the amount of sliding is large, the connection part of the tank and piping etc. is cut and liquid of dangerous materials May be leaked. The reasons for this are (1) that sliding may occur with the smallest wave force, and (2) that once sliding occurs, it is unlikely that it will tip over or cause side plate buckling due to internal and external water pressure differences. ing. In other words, if it is possible to suppress the sliding of the outdoor tank against wave forces caused by storm surges, tsunamis, etc., it is considered that the risk of dangerous substance outflow can be reduced.

  As a measure for preventing the tank from sliding, there is a tank body anchored to the foundation in order to increase the sliding resistance of the tank. Patent Document 1 discloses a protective structure that is installed around an outdoor tank and relieves the impact force of waves when the water level rises, and an outdoor that is installed on the protective structure toward the outdoor tank and floats when the water level rises. Disclosed is a protective equipment for an outdoor facility having a stopper body that abuts against a tank and prevents the lifting.

  An outdoor storage tank has been constructed in Kesennuma City with tsunami countermeasures (Non-Patent Document 2). A schematic diagram thereof is shown in FIG. This foundation is not a general tank foundation form but a special form. The foundation structure is a structure that protects the tank from tsunami wave forces by installing a PC concrete wall integrated with the foundation. The foundation is made of RC concrete, and protrusions are provided at the ends to prevent sliding and falling. In other words, the tank body has a structure that does not receive tsunami wave force directly and does not collapse.

JP 2012-229585

Ministry of Internal Affairs and Communications, Fire and Disaster Management Agency, “Survey Report on Tsunami and Inundation Countermeasures for Dangerous Goods Facilities” March 2009 (http://www.fdma.go.jp/neuter/topics/houdou/h21/2105/210526-1houdou /02_stunami_houkokusyo.pdf) Kesennuma City Industry Department Industrial Revitalization Strategies Section: About the basic plan for the Asahicho fishery fuel facility, the Great East Japan Earthquake Research Special Committee Material (2), June 12, 2015 http: //www.kesennuma.miyagi. jp / sec / s019 / 010/010/020/027/270612 / 2350270612iinkai_02.pdf Tanaka et al. “Damage Outline and Countermeasures for Facilities Related to Outdoor Tank Storage” Monthly Foundation, December 2012

  According to the damage summary of tanks damaged by the 2011 off the Pacific coast of Tohoku Earthquake (Non-Patent Document 3, etc.), 3 of the 4 tanks of the same size were damaged by tsunami forces. Under the influence, it slid about 17-18m horizontally. Since all the tanks that were slid were being inspected or stopped, they were in an air-liquid state on that day. On the other hand, the tank that did not slide was in operation, and about 60% of the liquid content was stored.

Force acting on the tank when the wave power is applied, the result (see Non-Patent Document 1) as in Figure 11, the larger the weight W _L of the tank body weight W _T and the content liquid, sliding resistance (mu ( W _T + W _L −F _Z )) also increases. Since the tank body weight W _T is essentially unchanged, in order to prevent sliding of the tank by increasing the sliding resistance would may be increased weight W _L of the content liquid. However, since the storage state of the content liquid changes every day depending on the owner's tank operation, it is difficult to say that storing a constant amount of the content liquid is a realistic measure.

  As described above, a tank made of a thin steel plate is a flexible structure. According to the structure of FIG. 10, when a tank bottom plate is directly placed on a very rigid concrete slab foundation, Since the foundation cannot follow the deformation of the bottom plate, wrinkles are locally generated in the steel plate, which may cause stress concentration. As a result, in the worst case, there is a concern that leakage of the content liquid may occur due to cracks or breakage of the tank bottom plate.

  In addition, the conventional anchoring structure based on the tank body is not installed for the purpose of preventing sliding against wind loads, and is not designed to prevent sliding against waves that are much larger than wind loads. It is not enough as a countermeasure against sliding against wave power. Moreover, the protective equipment of patent document 1 aims at the reduction of the horizontal wave force with respect to an outdoor tank at the time of flooding, and prevention of a lift, and does not prevent tank sliding by adjusting tank weight and increasing sliding resistance.

  In view of the problems of the prior art as described above, the present invention provides an outdoor tank sliding prevention method that prevents the outdoor tank from sliding by increasing the sliding resistance of the outdoor tank during flooding such as a tsunami, storm surge, or flood. The purpose is to provide a structure.

  An outdoor tank sliding prevention method for achieving the above object is a method for preventing sliding due to wave force when the outdoor tank is submerged, wherein a wall portion is installed so as to surround the outdoor tank, and the wall portion and A space is formed between the wall portion and a side plate of the outdoor tank by joining the bottom plate of the outdoor tank, a plurality of water permeable portions are provided in the wall portion, and when the water is immersed, the space portion passes through the water permeable portion. In other words, the water that flows over the upper end of the wall portion accumulates in the space to increase the apparent tank weight, thereby increasing the sliding resistance against the wave force acting on the outdoor tank.

  According to this outdoor tank sliding prevention method, the wall portion surrounding the outdoor tank and the bottom plate of the outdoor tank are combined to integrate the outdoor tank and the wall portion, and the space between the wall portion and the side plate of the outdoor tank. The apparent tank weight is increased by accumulating water that has flowed through the permeable part of the wall part and / or beyond the upper end of the wall part during inundation such as a tsunami, storm surge or flood. As a result, the sliding resistance against the wave force acting on the outdoor tank at the time of inundation such as tsunami, storm surge and flooding can be increased, so that the outdoor tank can be prevented from sliding.

  In addition, since the wall portion absorbs the submerged wave force acting on the outdoor tank at the time of flooding, the outdoor tank can be prevented from being damaged by the wave force. Moreover, since the collision of the drifting object can be avoided, it is possible to prevent the outdoor tank from being damaged by the drifting object.

  In the outdoor tank sliding prevention method, the water level accumulated in the space can be maintained by providing a backflow prevention mechanism in the water permeable portion in order to prevent leakage of the water accumulated in the space. For example, in the case of inundation due to a tsunami, the water level outside the wall may drop due to a pulling wave, but by keeping the water level in the space in preparation for subsequent waves after the second wave, the sliding resistance of the tank can be reduced. Can be maintained.

  Moreover, it is preferable to install the reinforcement part for reinforcing the said wall part. Further, the wall portion may be inclined to the outside of the outdoor tank in order to increase the volume of the space. Moreover, it is preferable to construct | assemble a foundation structure according to the position of the said wall part.

  An outdoor tank anti-skid structure for achieving the above object is a structure that prevents the outdoor tank from sliding due to wave force when the outdoor tank is submerged, and includes a wall portion installed so as to surround the outdoor tank, and the wall portion And a bottom plate of the outdoor tank, and a space formed between the wall portion and the side plate of the outdoor tank, and a plurality of water permeable portions provided on the wall portion, and the wall when immersed Sliding resistance to wave forces acting on the outdoor tank by increasing the apparent tank weight by water flowing through the water permeable part of the part and / or exceeding the upper end of the wall part in the space. Is to increase.

  According to this outdoor tank sliding prevention structure, the wall portion surrounding the outdoor tank and the bottom plate of the outdoor tank are joined together to integrate the outdoor tank and the wall portion, and the space between the wall portion and the side plate of the outdoor tank. The apparent tank weight is increased by accumulating water that has flowed through the permeable part of the wall part and / or beyond the upper end of the wall part during inundation such as a tsunami, storm surge or flood. As a result, the sliding resistance against the wave force acting on the outdoor tank at the time of inundation such as tsunami, storm surge and flooding can be increased, so that the outdoor tank can be prevented from sliding.

  In addition, since the wall portion absorbs the submerged wave force acting on the outdoor tank at the time of flooding, the outdoor tank can be prevented from being damaged by the wave force. Moreover, since the collision of the drifting object can be avoided, it is possible to prevent the outdoor tank from being damaged by the drifting object.

  In order to prevent leakage of water accumulated in the space in the outdoor tank sliding prevention structure, the water level accumulated in the space can be maintained by providing a backflow prevention mechanism provided in the water permeable portion. For example, in the case of inundation due to a tsunami, the water level outside the wall may drop due to a pulling wave, but by keeping the water level in the space in preparation for subsequent waves after the second wave, the sliding resistance of the tank can be reduced. Can be maintained.

  Moreover, it is preferable to provide the reinforcement structure for reinforcing the said wall part. Moreover, in order to increase the volume of the space, an inclined structure in which the wall portion is inclined to the outside of the outdoor tank may be provided. It is preferable to provide the foundation structure constructed | assembled according to the position of the said wall part.

  ADVANTAGE OF THE INVENTION According to this invention, the outdoor tank sliding prevention method and structure which prevented the sliding of an outdoor tank by increasing the sliding resistance of an outdoor tank at the time of inundation, such as a tsunami, a storm surge, and flood, can be provided.

It is a longitudinal cross-sectional view which shows schematically the outdoor tank sliding prevention structure by this embodiment. It is a partial front view (a) (b) which shows the example of the water permeable part provided in the wall part of FIG. It is a fragmentary perspective view which shows the example of the reinforcement structure of the wall part of FIG. It is a longitudinal cross-sectional view similar to FIG. 1 which shows the state at the time of the water immersion of the outdoor tank of FIG. FIG. 5 is a longitudinal sectional view similar to FIG. 1 schematically showing a state when the water level outside the wall portion is lowered from the state of FIG. 4 in the configuration example in which the water flow portion of FIG. 1 is provided with a backflow prevention mechanism. It is a partial longitudinal cross-sectional view (a) (b) which shows the backflow prevention mechanism provided in the water permeable part of FIG. It is the longitudinal cross-sectional view similar to FIG. 1 which used the wall part as the inclination structure. It is the same longitudinal cross-sectional view as FIG. 1 which shows the specific example of the outdoor tank sliding prevention structure provided in the outdoor tank of a capacity | capacitance of 1000 kiloliters. It is the schematic which shows (a) RC ring foundation which is a foundation structure of an outdoor tank, (b) pile foundation, and (c) slab foundation. It is the schematic which shows the construction example (nonpatent literature 2) of the outdoor storage tank which gave the tsunami countermeasure. It is a figure (nonpatent literature 1) showing roughly the force which acts on a tank when wave power acts.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. FIG. 1 is a longitudinal sectional view schematically showing an outdoor tank sliding prevention structure according to the present embodiment. 2 is a partial front view (a) and (b) showing an example of a water permeable portion provided on the wall portion of FIG. FIG. 3 is a partial perspective view showing an example of a wall reinforcing structure in FIG.

  As shown in FIG. 1, the outdoor tank 10 in the present embodiment includes a circular bottom plate 11, a cylindrical side plate 12 extending vertically from the bottom plate 11, and a top plate 13 provided at the upper end of the side plate 12. The tank main body 10a is provided. The outdoor tank is configured to store a predetermined content liquid L in the tank body 10a.

  The outdoor tank 10 has the outdoor tank sliding prevention structure according to the present embodiment. This outdoor tank anti-sliding structure includes a wall 15 installed so as to surround the outdoor tank 10, a space 20 formed between the wall 15 and the side plate 12 of the outdoor tank 10, and a large number of walls 15. A water permeable portion 17 provided.

  The wall portion 15 is generally formed of a steel plate in a cylindrical shape, is planarly concentric with the tank body 10a, and has a plate-like bottom portion 16 protruding radially inward at the lower end side, thereby having a longitudinal section. The shape is L-shaped. The bottom portion 16 of the wall portion 15 is coupled to the bottom plate 11 of the outdoor tank 10 by welding or the like at the coupling portion 16a, so that the bottom plate 11 and the wall portion 15 are integrated.

  A large number of water permeable portions 17 provided on the peripheral surface of the wall portion 15 are, for example, a large number of circular openings 17a as shown in FIG. 2A and a large number of horizontally extending portions as shown in FIG. It may be a slit-shaped opening 17b. For this reason, for example, a perforated steel plate such as a punching metal in which many circular holes and slits are formed can be used.

  Water enters the space 20 between the wall portion 15 and the side plate 12 of the outdoor tank 10 through the water permeable portion 17 of the wall portion 15 during flooding. In addition, although the height of the wall part 15 may be about the flooding height assumed by the said outdoor tank, it is not limited to this, You may set to another height.

  As shown in FIG. 3, the wall portion 15 has a plurality of retaining walls (buttresses) 18 at regular intervals as a reinforcing structure for reinforcing and holding the structure. The retaining wall 18 is formed of a right-angled triangular steel plate, is located in the space 20 of FIG. 1, and is attached to the wall portion 15 and the bottom portion 16 by welding or the like so as to be substantially orthogonal to the wall portion 15.

  With reference to FIG. 4, the effect of the outdoor tank sliding prevention structure by this embodiment is demonstrated. FIG. 4 is a longitudinal sectional view similar to FIG. 1 schematically showing the state of the outdoor tank of FIG. 1 during flooding. As shown in FIG. 4, when the water level rises outside the wall portion 15 during inundation such as a tsunami, storm surge, or flood, the water 21 flows in the direction a through the water permeable portion 17 and / or the upper end 15 a of the wall portion 15. And flows in the direction b, flows into the space 20 between the wall 15 and the side plate 12, and accumulates in the space 20.

Since the tank main body 10a and the wall 15 are integrated, the apparent weight of the tank main body 10a can be increased by the water 22 accumulated in the space 20. Thereby, the sliding resistance with respect to the wave force which acts on the tank main body 10a of the outdoor tank 10 at the time of inundation, such as a tsunami, storm surge, and flood, can be increased. In other words, as a result of the weight W _T of the tank body shown in FIG. 11 is increased, sliding resistance _{(μ (W T + W L} -F Z)) also becomes large, it is possible to prevent the sliding of the tank body 10a.

  As described above, according to the outdoor tank sliding prevention structure according to the present embodiment, the wall portion 15 provided on the outer periphery of the tank does not prevent the water itself from entering the periphery of the tank, but the space between the tank and the wall portion. By allowing water to enter 20, the weight of the water that has entered can be added to the sliding resistance, thereby increasing the tank sliding resistance.

  Moreover, since the water which flowed in the installation place of the outdoor tank 10 at the time of flooding first contacts the wall part 15, the tank main body 10a does not receive a wave force correctly. Thus, since the wall part 15 buffers the submerged wave force acting on the tank, the tank main body 10a can be prevented from being damaged by the wave force. Further, since the collision of the drifting object can be avoided as a secondary matter, damage to the tank body 10a due to the drifting object can be prevented.

According to the non-patent document 1 by the Fire and Disaster Management Agency, the following three ways of thinking are shown.
(1) Reduce wave force acting on the tank
(2) Increase the weight of the tank body (including the liquid content)
(3) Increasing the sliding resistance of the tank Of these (2), no practical measures are shown because no realistic measures can be found. In contrast, according to the present embodiment, a solution based on (2) can be newly proposed. That is, by installing the wall portion 15 on the outer periphery of the tank body 10a so as to surround the tank body 10a, and connecting the bottom portion 16 of the wall portion 15 and the bottom plate 11 of the tank body 10a, the wall portion 15 and the bottom plate 11 are integrated. The apparent weight of the tank body 10a can be increased by storing the water 22 in the space 20 between the wall portion 15 and the side plate 12 at the time of inundation such as tsunami, storm surge or flood.

  Next, a configuration example in which a backflow prevention mechanism is provided in the water permeable portion 17 of the wall portion 15 in FIG. 1 will be described with reference to FIGS. 5 and 6. FIG. 5 is a longitudinal sectional view similar to FIG. 1 schematically showing a state when the water level outside the wall portion is lowered from the state of FIG. 4 in this configuration example. 6 is a partial vertical cross-sectional view (a) and (b) showing a backflow prevention mechanism provided in the water-permeable portion of FIG.

  As shown in FIGS. 6A and 6B, the backflow prevention mechanism 25 has a closing plate 25 a that is large enough to cover the water permeable portion 17, and a rotation that rotatably supports the blocking plate 25 a at the upper portion of the water permeable portion 17. It has a moving support portion 25b and a sealing portion 25c made of an elastic member such as rubber provided around the closing plate 25a, and is provided in each water permeable portion 17 of the wall portion 15 on the space 20 side.

  As shown in FIG. 6A, according to the backflow prevention mechanism 25, the closing plate 25 a is rotated in the clockwise direction r around the rotation support portion 25 b by its own weight and around the water permeable portion 17. The water permeable part 17 is closed by hitting through the sealing part 25c. In this state, when the water level rises outside the wall portion 15 during inundation such as a tsunami, storm surge or flood as shown in FIG. 4, and the water pressure is applied to the closing plate 25a, the closing plate as shown in FIG. 6B. 25a counteracts its own weight and rotates in the counterclockwise direction r ′ in the figure around the rotation support portion 25b, away from the periphery of the water permeable portion 17, opens the water permeable portion 17, and the outside of the wall portion 15 The water 21 (FIG. 4) flows in the direction a through the water permeable portion 17, and the water 22 accumulates in the space 20 as shown in FIG.

  Next, when the water level outside the wall portion 15 decreases as shown in FIG. 5, due to the water pressure of the water 22 accumulated in the space 20, the closing plate 25a is rotated in the clockwise direction r as shown in FIG. The water-permeable portion 17 is sealed and closed with a sealing portion 25c that is elastically deformed. In this way, the backflow prevention mechanism 25 prevents the water 22 accumulated in the space 20 from backflowing and preventing the water 22 from leaking out, so that the water level outside the wall portion 15 decreases as shown in FIG. However, the water level in the space 20 can be kept high.

  In the case of inundation due to a tsunami or the like, the water level outside the wall portion 15 may drop due to a pulling wave, but it is necessary to prepare for subsequent waves after the second wave. In such a case, as shown in FIG. 5 and FIG. 6, by providing the backflow prevention mechanism 25 in the water permeable portion 17 of the wall portion 15, the water level in the space 20 is raised even when the water level outside the wall portion 15 falls. Since it can be maintained, the sliding resistance of the tank can be maintained.

  Further, when the backflow prevention mechanism 25 is provided on the wall 15 as shown in FIGS. 5 and 6, the state of FIG. 6A of the backflow prevention mechanism 25 is assumed to be normal, but the present invention is not limited to this, and FIG. ) May be configured to be normal. That is, the urging member such as a spring provided on the rotation support portion 25b urges the closing plate 25a in the counterclockwise direction r ′ against its own weight as shown in FIG. When the water level outside the wall portion 15 rises and water flows in the direction a and the water level inside the space 20 becomes high when the water level is submerged, the water level outside the wall portion 15 decreases as shown in FIG. Due to the water pressure of the accumulated water 22, the closing plate 25 a rotates in the clockwise direction r as shown in FIG. 6A against the urging force of the urging member so as to seal and close the water permeable portion 17. Alternatively, the backflow prevention mechanism 25 may be configured.

  A drain valve (not shown) for discharging water from the space 20 is preferably provided on the wall 15. When the inundation due to the tsunami, storm surge, flood, etc. has stopped, there is no risk of tank sliding, and it is no longer necessary to store water in the space 20 as shown in FIG. Further, rainwater staying in the space 20 when not flooded is also drained from the drain valve.

  Moreover, although the wall part 15 of FIG. 1 is an upright structure, it is good also as the wall part 26 which has an inclination structure like FIG. That is, the wall portion 26 in FIG. 7 is inclined so as to open outward in the radial direction with respect to the bottom portion 16, so that a large volume of the space 20 can be secured. For this reason, for example, the wall part 26 can be previously inclined to the tank outer side with respect to the bottom part 16. In this case, the reinforcing structure of FIG. 3 is a retaining wall 18a having a shape matched to the inclination of the wall portion 26 as shown in FIG. 7, and / or the wire 19 indicated by a broken line is used, so that the inclined shape of the wall portion 26 is obtained. Can keep.

  Next, a specific example of the outdoor tank sliding prevention structure of FIG. 1 will be described with reference to FIG. FIG. 8 is a longitudinal sectional view similar to FIG. 1 showing a specific example of an outdoor tank sliding prevention structure provided in an outdoor tank having a capacity of 1000 kiloliters.

  As shown in FIG. 8, when an outdoor tank with a capacity of 1000 kiloliters is in an air-liquid state (there is no content liquid L in FIG. 1), there is a flood of 4.4 m in height in the vicinity (Non-Patent Document 1). The maximum inundation depth in the model tsunami at the time of the study of (1), and how much water would accumulate in the space between the side plate and the wall of the tank body was estimated. Non-Patent Document 1 examines the fire department, and in a 1000 kiloliter tank, if the storage rate is about 64% or more, no sliding occurs.

  As a result of the trial calculation, the wall height is 4.4 m, the separation distance between the side plate of the tank body and the wall is about 3.5 m or more, and if water is accumulated in the space, the amount of water in the space will be It is 640 kiloliters, has a storage rate of 64%, and even if the tank is empty, the tank will not slide. Regarding the foundation structure, as shown in FIG. 8, the existing tank can be dealt with by widening the foundation, and if it is a new tank, it can be dealt with by the foundation design with the wall in mind from the beginning of the design.

  As described above, the modes for carrying out the present invention have been described. However, the present invention is not limited to these, and various modifications can be made within the scope of the technical idea of the present invention. For example, the outdoor tank sliding prevention structure according to the present embodiment can be provided in both an existing outdoor tank and a new outdoor tank.

  Moreover, in FIG. 1, although the wall part 15 was comprised from the L shape with the bottom part 16, this invention is not limited to this, For example, the steel plate which comprises the bottom part 16, and the bottom plate 11 of the outdoor tank 10 are welded etc. And the steel plate constituting the bottom portion 16 and the wall portion 15 may be joined by welding or the like. Moreover, the outer diameter of the bottom plate 11 of the outdoor tank 10 may be configured to be large in advance, and the wall portion 15 may be coupled to the bottom plate 11 by welding or the like.

  Further, the backflow prevention mechanism 25 in FIGS. 6A and 6B is an example, and it is needless to say that other configurations may be used.

  Moreover, the shape of the opening which comprises the water permeable part 17 is not limited to circular shape and slit shape like Fig.2 (a) (b), Another shape may be sufficient.

  In FIG. 3, the retaining wall 18 is provided as a reinforcing structure of the wall portion 15. However, instead of the retaining wall 18 or in addition to the retaining wall 18, a wire 19 indicated by a broken line in FIG. .

  Moreover, the foundation structure of the outdoor tank in this embodiment may be the RC ring foundation, pile foundation, or slab foundation of FIGS.

  According to the outdoor tank sliding prevention method and the outdoor tank sliding prevention structure of the present invention, the outdoor tank can be prevented from sliding by increasing the sliding resistance of the outdoor tank at the time of flooding such as tsunami, storm surge or flood. It is possible to prevent the liquid of dangerous materials from flowing out by cutting the connection between the outdoor tank and the piping due to the sliding.

DESCRIPTION OF SYMBOLS 10 Outdoor tank 10a Tank main body 11 Bottom plate 12 Side plate 13 Top plate 15, 26 Wall portion 15a Upper end 16 of wall portion 15 Bottom portion 16a Joint portion 17 Water permeable portions 17a, 17b Openings 18, 18a Retaining wall 20 Space 25 Backflow prevention mechanism

Claims (4)

A method for preventing sliding due to wave force when the outdoor tank is flooded,
A wall portion is installed so as to surround the outdoor tank, and a space is formed between the wall portion and a side plate of the outdoor tank by combining the wall portion and a bottom plate of the outdoor tank,
A plurality of water permeable portions are provided in the wall portion,
Wave force acting on the outdoor tank by increasing the apparent tank weight when water flowing through the water permeable portion of the wall portion and / or exceeding the upper end of the wall portion is accumulated in the space when immersed. Outdoor tank sliding prevention method to increase the sliding resistance against.   The outdoor tank sliding prevention method according to claim 1, wherein a backflow prevention mechanism is provided in the water permeable portion in order to prevent leakage of water accumulated in the space.   The outdoor tank sliding prevention method according to claim 1 or 2, wherein a reinforcing portion for reinforcing the wall portion is installed. It is a structure that prevents sliding due to wave force when the outdoor tank is flooded,
A wall formed so as to surround the outdoor tank, and a space formed between the wall and a side plate of the outdoor tank by combining the wall and a bottom plate of the outdoor tank; A plurality of water permeable portions provided on the wall,
Wave force acting on the outdoor tank by increasing the apparent tank weight when water flowing through the water permeable portion of the wall portion and / or exceeding the upper end of the wall portion is accumulated in the space when immersed. Outdoor tank anti-skid structure to increase the sliding resistance against.

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