JP2013203426A - Support structure for tank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a support structure for a tank, which is capable of easily improving the seismic performance of an existing ground tank fixedly planted by support members including tilting materials, and in which regarding a new ground tank fixedly planted by support members including tilting materials, a reduction in diameter of a support can be achieved, and also, a reduction in the number of supports can be achieved, and thereby, a construction cost can be improved and a construction period can be shortened.SOLUTION: A support structure for a tank includes: a plurality of bases 5 provided in a ground around a spherical tank 1, and each including an anchor part; a plurality of supports 2 each suspended from each base 5; and a plurality of tilting materials 3, each of which obliquely connects the supports 2 and 2 adjacent to each other by one tilting material and has earthquake energy absorbing function capable of exhibiting the earthquake energy absorbing function by the drawing resistance or less of the anchor part just under the support 2 to which the lower end thereof is fixedly connected.

Description

  The present invention relates to a tank support structure that improves the earthquake resistance of a ground tank used for storing compressed gas such as city gas and hydrogen gas, and liquefied gas such as LPG.

  Conventionally, in order to stably supply primary energy resources such as oil and gas to consumers, a storage tank has been provided in a part of the supply system for stockpiling. The storage tank includes an above-ground tank, an underground tank, and the like, and the above-described tank includes a spherical tank (spherical tank) and a cylindrical tank.

  These tanks are used to store compressed gas such as city gas and hydrogen gas, and liquefied gas such as LPG, and many of the spherical tanks are erected on the ground at the lower part thereof. It is installed by supporting it with a support part (leg part) composed of braces that connect a large number of struts and adjacent struts (see FIG. 9).

  Many cylindrical tanks are installed by supporting the periphery of the tank with a support portion composed of upper and lower braces that connect a large number of struts standing on the ground and adjacent struts (see FIG. 10). ).

  As mentioned above, most of the above-ground tanks are supported by braces that connect the struts to the adjacent struts. Therefore, when a large earthquake occurs, the braces buckle, deform, or break due to the shaking of the earthquake. May cause damage.

  In fact, in the Great East Japan Earthquake, a gas tank explosion disaster has been triggered by the breakage of the struts that support the gas tank. Conventionally, a device for improving the earthquake resistance of the spherical tank legs has been devised, but due to the above-mentioned disaster, there is a movement to check the earthquake resistance of the tank bracing and review the earthquake resistance standard.

  As a conventional seismic technology, for example, Patent Document 1 discloses that the existing leg supporting part and the outer circumference of the connecting part from the foundation supporting the spherical shell of the spherical tank to the spherical shell are divided in half or entirely. A spherical shape in which a new cylindrical support member using a cylindrical tube is coated and a new cylindrical brace using a split cylindrical tube is coated on the whole or part of the outer periphery of an existing brace provided between the support portions of the support portion. The tank seismic reinforcement structure is described.

  Further, in Patent Document 2, a plurality of elongated support poles supporting the periphery of a spherical tank whose upper end is fixed around the spherical tank and whose lower end is supported by a tank leg foundation, and the upper end of the support pole It consists of an upper brace connected to the upper part, a lower brace connected to the lower part of another supporting pole whose lower end is adjacent to it, and an energy absorbing damper in the middle, and the upper part of the supporting pole is inclined to the lower part of another adjacent supporting pole. The seismic structure of a spherical tank with an energy absorbing brace connected to is described.

  On the other hand, as a member that improves the earthquake resistance of structures using braces such as bridges, it is incorporated between the layers of the main frame of the structure, and when a large interlayer deformation occurs, the steel material that becomes the core material is plastically deformed Various buckling-restrained braces that absorb seismic energy and attenuate vibration are known.

  For example, in Patent Document 3, in a buckling restrained brace made of a core material made of a steel plate and a steel buckling restraint material provided around the cross section of the core material, it protrudes from an end of the buckling restraint material. A buckling restrained brace is described in which flange steel plates that are substantially orthogonal to the width direction of the core material are provided at both ends of the core material in the width direction.

  Further, Patent Document 4 discloses an RC frame frame composed of two or more RC member columns standing upright on a foundation and RC member beams spanned on top of the columns, A vibration control pier structure including a brace frame having a vibration control function such as a buckling-restrained brace arranged in a surface of an RC frame frame, wherein a plastic hinge is formed by an earthquake motion more than expected. Braces that connect a pair of left and right columns are also arranged at the upper and lower ends of the columns of the RC frame frame, and one ends of the braces at the upper and lower ends of the columns are respectively joined to hunches formed on the upper and lower ends of the columns, Alternatively, a seismic control pier structure characterized by being joined to the lower surface of the beam and the upper surface of the foundation is described.

JP 2011-184056 A JP 2002-080090 A JP 2001-214541 A JP 2008-214973 A

  As described above, various ground tanks have been devised to enhance the earthquake resistance of the support portions (leg portions).

  However, as mentioned above, the Great East Japan Earthquake ignited the leaked LPG due to the damage of the leg of the spherical tank (the brace) and caused an explosion disaster. The existing seismic performance has proved insufficient for the high level of ground motion that is generated, and therefore there is a need to review and develop new technologies for the seismic performance of the support structure of the ground tank.

  If the struts and braces are made thicker as in Patent Document 1, the earthquake resistance is improved, but the material cost and the construction cost are increased, which is not economical, and is not necessarily effective for high-level earthquake motion.

  In addition, if an energy absorbing brace using an oil damper is used as in Patent Document 2, it will be easy to cope with various vibrations, so it can be expected to be effective against high-level seismic motions, but it can also operate against small vibrations. Therefore, the tank cannot be supported stably, and it is necessary to cope with the deterioration of the oil, and long-term maintenance is difficult. An upper brace and a lower brace connected to the end of the oil damper are also required.

  On the other hand, elastoplastic braces (buckling-restrained braces) and friction dampers as shown in Patent Document 3 have been conventionally used, and as shown in Patent Document 4, they are often used for bridges. There is no example applied to.

  The present invention is intended to solve the above-described problems, and can easily improve the seismic performance of an existing ground tank that is erected and fixed by a support member including an inclined member. The purpose of the new ground tank standing and fixed by members is to provide a support structure for the tank that can reduce the diameter of the columns and reduce the number of columns, improve the construction cost, and shorten the construction period. And

  The invention according to claim 1 of the present application is a tank support structure that is erected and fixed by a support member, and the support member includes a plurality of foundations that are provided on the ground around the tank and have anchor portions, A plurality of supporting columns suspended from the foundation and a plurality of inclined members having a seismic energy absorbing function that connect the supporting columns obliquely with one, and the inclined member has a lower end of the inclined member connected and fixed. The tank support structure is characterized in that the seismic energy absorption function is exhibited below the pulling-out strength of the anchor portion directly below the supporting column.

  The tank targeted by the present invention is a spherical or cylindrical ground tank (gas tank, heavy oil tank, etc.) standing and fixed by a support member disposed around the tank, and the support member is a foundation having an anchor portion. , Struts, slanted material (bars). The tank may be an existing one or a new one. If it is an existing tank, it will be seismically reinforced. If it is a new tank, it will be a tank with stronger earthquake resistance than before.

  The tank support structure according to the present invention includes a plurality of foundations provided on the ground around the tank and having anchor portions, a plurality of pillars suspended from the foundations, and an earthquake in which the pillars are obliquely connected to each other. The support member includes a plurality of inclined members having an energy absorbing function, and these support members are connected to and disposed around the tank to fix the tank upright.

  The struts that are obliquely connected with one slant are either the struts adjacent to each other or the struts that are the one struts ahead of the struts adjacent to one strut.

  The inclined member has a seismic energy absorbing function such as an elastoplastic brace (buckling restrained brace), a friction damper, etc., and both ends have other inclined members (for example, an upper brace and a lower portion described in Patent Document 1). It functions as an inclined member without being connected to a brace.

  In the tank support structure of the present invention, as described above, in a plurality of support columns suspended from the periphery of the tank, the support columns are obliquely connected to each other by the one inclined material. In the case of an existing tank, a part or all of the existing inclined members (struts) installed are removed, and the inclined members are attached to form the above structure. In the case of a new tank, the above structure is made from the inclined material from the beginning.

  Other support members such as the foundation and the support column can be used as they are if the existing tank is seismically reinforced. If a new tank is installed, it is possible to use struts with a smaller diameter than before and reduce the number of struts, leading to a reduction in foundation construction costs.

  The inclined member used in the tank support structure of the present invention exhibits a seismic energy absorbing function below the pulling-out strength of the anchor portion in the foundation located immediately below the column to which the lower end of the inclined member is connected and fixed. This is very important. This is because when the inertia force of the tank generated by an earthquake is transmitted to the anchor part, if the generated force exceeds the pulling-out strength of the anchor part, the anchor part will be destroyed and the support function of the tank will be lost, resulting in a major accident. This is because there is a possibility of connection.

  For example, if such an inclined material is an elastoplastic brace (buckling restraint brace), the yield load Py shown in FIG. 3 is set to be equal to or less than the pulling strength of the anchor portion, and if it is a friction damper, it is shown in FIG. It can be obtained by setting the sliding load Ps to be equal to or less than the pulling-out strength of the anchor portion.

  By adopting such a support structure using an inclined member, if the inclined member is an elasto-plastic brace (buckling restrained brace) before the anchor portion is pulled out, plastic deformation will occur, and a friction damper may be used. Since slip deformation occurs, damage to the column anchor can be avoided, and a highly earthquake-resistant support structure is obtained.

  The invention according to claim 2 of the present application is characterized in that the inclined material is an elastoplastic brace, and the elastoplastic brace has a yield load equal to or less than the pulling strength. This is a tank support structure.

  Elasto-plastic brace was developed as a sacrificial member of a structure. When large-scale earthquake motion acts on the structure, the area where the brace core material is deformed is plastically deformed to absorb seismic energy and control the structure. A brace that can be controlled and is also called a buckling-restrained brace, and is described in, for example, Japanese Patent Application Laid-Open Nos. 2012-13157, 2003-193699, 2001-214541, and 2000-27293. Things.

  When a large-scale earthquake occurs by using this as an inclined material, it is preferable because an effect of concentrating member damage on the inclined material and absorbing earthquake energy can be obtained.

  However, the elastoplastic brace used here is designed so that its yield load is equal to or less than the pulling strength of the anchor portion in the foundation directly below the column to which the lower end of the elastoplastic brace is connected and fixed. The reason for this limitation is that if the anchor part breaks before the brace core material installed in the support structure is plasticized, the installation effect (the effect of absorbing seismic energy due to plastic deformation) will not be exhibited effectively. It is.

  Such an elasto-plastic brace can be obtained by setting the yield load Py of the cross section of the member to be plastically deformed to be equal to or less than the pulling strength of the anchor portion as described above.

  The invention according to claim 3 of the present application is the tank according to claim 1, wherein the inclined material is a friction damper, and the friction damper has a friction load equal to or less than the pulling strength. Support structure.

  The friction damper is a vibration damper that utilizes the frictional resistance of an object, and includes, for example, a damper that includes a friction joint using a high-strength bolt. By using this as an inclined material, when a large-scale earthquake occurs, it is preferable because an effect of concentrating member damage on the inclined material and absorbing earthquake energy can be obtained.

  However, the friction damper used here has a friction load (sliding load) that is equal to or less than the pulling-out strength of the anchor portion in the foundation directly below the column to which the lower end of the friction damper is connected and fixed.

  The reason for this limitation is that if the anchor part of the support structure breaks before the friction damper installed on the support structure reaches the sliding load, the installation effect (the effect of absorbing seismic energy due to slip deformation) is effective. It is because it is not demonstrated.

  Such a friction damper is set so that, for example, the axial force to be introduced into the friction joint is set after grasping the friction coefficient (slip coefficient) of the friction surface, and the slip load Ps is equal to or less than the pulling strength of the anchor portion. And can be obtained by making.

  The invention according to claim 4 of the present application is the tank support structure according to any one of claims 1 to 3, wherein the inclined member is connected to the support column by pin coupling.

  The pin connection is a connection method in which a bending moment is not transmitted to the connection part.

  Conventionally, in a support structure for a ground tank, inclined members such as braces are often connected to a support member by a welding method. In addition, conventional buckling-restrained braces and friction dampers are often joined by a friction joining method using high-strength bolts in structures such as bridges.

  If these connection methods are simply applied to the tank support structure of the present invention, excessive bending stress is locally generated in the support member at the joint portion with the support member, resulting in damage to the region. This is not preferable because there is a possibility of causing a problem such as. By using a pin connection to connect the inclined member to the support column, it is preferable because only the axial force is transmitted to the inclined member and the bending stress is not transmitted.

  The invention according to claim 5 of the present application is characterized in that the inclined material is provided in a W shape by alternately changing the inclined direction of the adjacent inclined material. It is the support structure of the tank as described in above.

  The tank support structure according to the present invention has a structure in which only one inclined member is provided in either the right oblique direction or the left oblique direction between the support columns on which the inclined members are installed. In this case, it is preferable that the inclined material that is provided next to each other is disposed in a W shape in which the inclination direction is alternately changed between a plurality of support columns that are provided around the tank.

  By adopting such a structure, high earthquake resistance can be achieved with a small number of inclined members, so that the cost can be reduced. In addition, when an existing tank is retrofitted with earthquake resistance, repair work can be performed easily and at low cost.

  According to the tank support structure of the present invention, it is possible to improve the seismic performance of an existing ground tank that is erected and fixed by a support member including an inclined member, simply and at low cost.

  In addition, in a new ground tank that is erected and fixed by a support member including an inclined member, it is possible to reduce the diameter of the columns and the number of columns to improve the construction cost and shorten the construction period. A highly earthquake-resistant tank is obtained.

It is a front view which shows an example of the support structure of the tank of this invention constructed | assembled by earthquake-proofing the support part (leg part) of the existing spherical type ground tank (spherical tank). It is a front view which shows an example of the support structure of the tank of this invention constructed | assembled by earthquake-proofing the support part of the existing cylindrical ground tank (cylindrical tank). It is a figure which shows the example of the load-displacement log | history characteristic of an elastic-plastic brace. It is a figure which shows the example of the load-displacement log | history characteristic of a friction damper. It is sectional drawing which shows the structural example of the foundation in the support structure of the tank of this invention. It is a figure which shows the example of attachment structure to the support | pillar of the inclined material in a support | pillar lower end. It is a front view which shows an example of the support part (leg part) of the spherical tank newly installed using the support structure of the tank of this invention. It is a front view which shows the other example of the support part (leg part) of the spherical tank newly installed using the support structure of the tank of this invention. It is a front view which shows the existing spherical type ground tank (spherical tank). It is a front view which shows the existing cylindrical ground tank (cylindrical tank). It is a front view which is an example of the attachment to the lower end of the support | pillar of the inclined material using the attachment member which has a junction part separately, and shows the example which shifted | deviated the position of the bolt removal from the pin junction part. It is a front view which is an example of attachment to the support | pillar lower end of the inclined material using an attachment member, and shows the example which shared the position of bolt removal with the pin junction part. It is a front view which shows the other example of the support structure of the tank of this invention constructed | assembled by earthquake-proofing the support part (leg part) of the existing spherical type ground tank (spherical tank).

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail based on the drawings. Note that the present invention is not limited to the embodiments described below.

  FIG. 1 is a front view showing an example of a support structure for a tank according to the present invention, which is constructed by seismic reinforcement of a support part (leg part) of an existing spherical tank (spherical tank).

  As shown in the figure, the spherical tank 1 is erected and fixed on the ground by a support portion 4. The support portion 4 is constructed by the tank support structure of the present invention, and generally includes a base 5 having an anchor portion (not shown), a support column 2 and an inclined member 3.

  And the support | pillar 2 is hung above the foundation 5, and the one inclination material 3 is provided between the adjacent support | pillars 2 and 2, respectively, and the support | pillars 2 and 2 are connected diagonally. . The inclined member 3 is provided in a W shape by alternately changing the inclination direction between adjacent columns.

  An end plate wider than the width of the column member is attached to the lower end of the column 2, which is used as a base plate 6, and is fixed to the base 5 by anchor bolts 7, and the upper end is directly fixed to the spherical tank and the tank by welding. .

  The inclined member 3 has a seismic energy absorbing function and is not limited as long as the inclined member is formed as a single piece as shown in the figure. Among them, the elastoplastic brace and the friction damper are compared with the hydraulic damper, This is preferable because it does not require maintenance and management and is inexpensive. There are many types of elastoplastic braces, which are also called buckling-restrained braces, but are not particularly limited.

  FIG. 1 shows the existing spherical tank support part (leg part) shown in FIG. FIG. 9 shows an existing tank before the modification shown in FIG. A brace 10 is provided between adjacent struts 2 and 2. The remodeling is performed only for the brace 10, and the support column 3 and the foundation 5 remain the same as before.

  That is, the seismic reinforcement is simple, such as simply removing the conventional brace 10 and replacing it with the inclined member 3. The newly installed inclined member 3 is attached to the existing support column 3 by pin connection.

  FIG. 2 is a front view showing an example of a tank support structure according to the present invention constructed by seismically reinforcing a support portion of an existing cylindrical ground tank (cylindrical tank).

  A support portion 4 is provided around the cylindrical tank 9, and the support portion 4 includes a base 5 having an anchor portion (not shown) and a support column 2 provided on the base 5. One inclined member 3 is provided in the lower part between 2 and 2 to connect the support pillars 2 and 2 diagonally, and the existing brace 10 remains in the upper part without being removed.

  Here again, the inclined member 3 is provided in a W shape by alternately changing the inclination direction between adjacent columns. Thus, in the tank support structure of the present invention formed by seismic reinforcement of an existing tank, part of the existing braces and braces may be left, and such a case is also included in the scope of the present invention. It is.

  The inclined member 3 is the same as in the case of the spherical tank 1, and the support column 3 and the foundation 5 are the same as in the case of the spherical tank 1.

  FIG. 10 shows an existing cylindrical tank before the modification of the tank shown in FIG. As shown in the figure, a support portion 4 is provided around the cylindrical tank 9, and a brace 10 is provided between the adjacent support columns 2, 2 at the upper portion and the lower portion, respectively.

  Remodeling is performed only for the lower brace 10, and the upper brace 10, support column 3 and foundation 5 remain the same as before. That is, the seismic reinforcement is simple such that the conventional brace 10 at the lower portion is simply removed and replaced with the inclined member 3. The newly installed inclined member 3 is attached to the existing support column 3 by pin connection.

  As described above, if the existing ground tank that is erected and fixed by the support member including the inclined member (the brace) is supported by the tank support structure of the present invention, only the existing inclined member (the brace) is used in the present invention. Since it is only necessary to replace the specified inclined material, the earthquake resistance can be improved easily and at low cost.

  In the tank support structure of the present invention, the inclined member 3 exhibits a seismic energy absorbing function below the pulling-out strength of the anchor portion directly below the column 2 to which the lower end of the inclined member 3 is connected and fixed. Therefore, when the inclined member 3 is an elastoplastic brace, it is preferable that the elastoplastic brace has a yield load equal to or less than the pulling strength.

  FIG. 3 is a diagram showing an example of load-displacement history characteristics of an elastoplastic brace. Py represents the yield load, K1 represents the rigidity when the brace core is within the elastic range, and K2 represents the rigidity when the brace core is plasticized.

  As can be seen from this figure, if the yield load Py is set below the pulling strength of the anchor part, the elastic-plastic brace will first plastically deform and absorb the earthquake energy while the anchor part is within a healthy range. This is preferable.

  An elastoplastic brace whose yield load is less than the pullout strength of the anchor part is designed and manufactured so that the value obtained by multiplying the yield strength of the core material by the cross-sectional area of the core material cross section is less than the pullout strength of the anchor part. Can be obtained.

  When the inclined member 3 is a friction damper, it is preferable that the friction damper has a friction load (sliding load) that is equal to or less than the pulling strength.

  FIG. 4 is a diagram illustrating an example of load-displacement history characteristics of the friction damper. Ps indicates a sliding load (friction load), and K1 indicates the rigidity until the damper axial force reaches the sliding load.

  As can be seen from this figure, when the sliding load Ps is set to be equal to or less than the pulling strength of the anchor portion, the friction damper first slips and absorbs the seismic energy while the anchor portion is within a healthy range. Therefore, it is preferable.

  For example, when a high-strength bolt friction joint is built in, the friction damper whose sliding load (friction load) is less than the pullout strength of the anchor part is a value obtained by multiplying the friction coefficient of the friction joint surface by the axial force introduced into the bolt. Can be obtained by designing and manufacturing so that it becomes less than the pulling strength of the anchor portion.

  FIG. 5 is a cross-sectional view showing an example of the basic structure of the tank support structure of the present invention. As shown in FIGS. 1 and 2, a plurality of foundations 5 are provided on the ground around each tank.

  The foundation 5 is made of concrete and is buried in the middle of the ground, and has an anchor portion (an anchor bolt 7 in this case) for fixing the base plate 6 to which the support column 2 is suspended and fixed to the foundation 5. The column 2 is fixed to the base plate 6 by welding, and the base plate 6 is attached to the foundation 5 with bolt nuts at the heads of the anchor bolts 7.

  When the existing tank support member is seismically reinforced to provide the tank support structure of the present invention, the existing foundation 5 can be used as it is.

  The pulling-out strength of the anchor portion referred to in the present invention is a tensile force when the anchor bolt 7 comes off from the foundation 5, and the example of FIG. 5 corresponds to the example of FIG. Since it is composed of four bolts, it is a value obtained by quadrupling the pulling strength per anchor bolt.

  FIG. 6 is a diagram illustrating an example of a structure for attaching the inclined member to the support at the lower end of the support. Two adjacent slant members 3 are attached by pin connection via one attachment member 8 attached to the lower end of the column 2 suspended above the foundation 5 as shown in FIG.

  The attachment member 8 is obtained by welding a rib or the like necessary for pin joining to a steel pipe member that has been divided in advance, and is attached to the support column 2 by the joining member 12. The inclined member 3 is attached to the attachment member 8 by pin joining using the pins 11.

  As described above, it is preferable that the inclined member 3 is attached by pin coupling. This is because only an axial force is transmitted to the inclined member without transmitting an excessive bending moment to the attaching portion of the column 2.

  FIG. 11 and FIG. 12 are examples of attaching the inclined member 3 to the support column 2 by pin connection. Both are examples in which the joint portion (joining member 12) is bolted so that the mounting member 8 can be easily attached to and detached from the column 2, and FIG. 11 is an example in which the position of the bolt removal is shifted 90 degrees from the pin joint portion. The example shown in FIG. 12 is an example in which the position of the joint is also used as the pin joint.

  Here, as in FIG. 6, an example of a structure for attaching the inclined material to the support at the lower end of the support is shown, but the inclined material is preferably attached to the support with the same structure also at the upper end of the support.

  In FIG. 11, a halved mounting member 8 having a pin hole is fastened and fixed to the column 2 by a joining member 12. The joining member 12 is designed so as to have a joint strength greater than the axial force generated at the pin joint.

  A pin hole is also provided at the end of the inclined member 3 and is connected to the mounting member 8 by a pin 11. The pin 11 has a structure having a shear strength greater than the axial force generated at the pin joint.

  In FIG. 12, the position of the bolt removing is also used for the pin joint, but it is basically the same as FIG.

  FIG. 7 is a front view showing an example of a support portion (leg portion) of a spherical tank newly provided using the tank support structure of the present invention.

  Conventionally, the support portion 4 of the spherical tank has a support structure as shown in FIG. 9, and the column 2 is generally a steel pipe column having an outer diameter of about 80 cm. However, as shown in FIG. 7, when a spherical tank is newly installed using the tank support structure of the present invention, the outer diameter can be reduced to about 60 cm when the column 2 is constructed of the same material.

  The tank support structure according to the present invention is economical because the seismic performance can be improved even if the diameter of the support column 2 is reduced.

  The spherical tank support 4 may be constructed by a method similar to the conventional method, but the inclined member 3 is preferably attached to the support column 2 by pin connection as shown in FIG.

  FIG. 8 is a front view showing another example of a support part (leg part) of a spherical tank newly installed using the tank support structure of the present invention.

  When a spherical tank is newly installed using the tank support structure of the present invention, as shown in FIG. 7, the diameter can be reduced if the number of support columns 2 is the same as that of the conventional spherical tank shown in FIG. However, as shown in FIG. 8, the diameter of the support columns 2 can be the same and the number of the support columns 2 can be reduced.

  For example, the conventional number of 16 can be reduced to 12. In this case, since the length of the inclined member 3 becomes longer, it is preferable to use a thicker and more rigid inclined member 3 than in the case shown in FIG.

  The tank support structure of the present invention is economical because the seismic performance can be improved even if the number of the support columns 2 is reduced in this way. The method for constructing the support portion 4 of the spherical tank may be performed by a method similar to the conventional method, but in this case as well, it is preferable to attach the inclined member 3 to the support column 2 by pin connection as shown in FIG.

  FIG. 13 is a front view showing another example of the support structure of the tank according to the present invention which is constructed by seismic reinforcement of the support part (leg part) of an existing spherical ground tank (spherical tank).

  Here, as shown in the figure, the inclined member 3 is connected between the columns 2 and 2 of the column 2 adjacent to the column 2 by skipping the column 2 adjacent to the column 2. Thus, the support structure of the tank of the present invention is not only the support structure in which the adjacent struts 2 and 2 are connected by the slanting member 3 but also the other struts 2 and 2 are connected by the slanting member 3. In some cases, the support structure is also included.

  As can be seen by comparing FIG. 1 and FIG. 13, the example of FIG. 13 has more columns than the example of FIG. 1, and the space between adjacent columns is narrower. Thus, when there are many support | pillars, the support structure shown in FIG. 13 can also be applied in consideration of a reinforcement effect and construction efficiency. Which structure is selected is determined after ascertaining the installation effect due to the difference in the number of installations and installation angles.

  As described above, the example of the spherical tank is shown in the new installation, but the same applies to the cylindrical tank. As described above, in the new ground tank using the tank support structure of the present invention that is erected and fixed by the support member including the inclined member, it is possible to reduce the diameter of the columns and the number of columns, thereby improving the construction cost. Because the construction period can be shortened, a low cost and high earthquake resistance tank can be obtained.

  DESCRIPTION OF SYMBOLS 1 ... Spherical tank, 2 ... Support | pillar, 3 ... Inclined material, 4 ... Support part (leg part), 5 ... Base, 6 ... Base plate, 7 ... Anchor bolt (anchor part) 8 ... Mounting member, 9 ... Cylindrical tank, 10 ... Bracing (existing inclined material), 11 ... Pin, 12 ... Joining member

Claims (5)

  A support structure for a tank that is erected and fixed by a support member, wherein the support member includes a plurality of foundations that are provided on the ground around the tank and have anchor portions, and a plurality of columns that are suspended from the foundations. A plurality of slant members having a seismic energy absorption function that obliquely connect the struts with one piece, and the slant member is formed of the anchor portion directly below the strut to which the lower end of the slant member is coupled and fixed. A tank support structure characterized in that the seismic energy absorbing function is exhibited below the pulling-out strength.   2. The tank support structure according to claim 1, wherein the inclined member is an elastoplastic brace, and the yield load of the elastoplastic brace is equal to or less than the pulling strength.   The tank support structure according to claim 1, wherein the inclined material is a friction damper, and the friction damper has a friction load equal to or less than the pulling strength.   The tank support structure according to any one of claims 1 to 3, wherein the inclined member is connected to the support column by pin coupling.   The tank support structure according to any one of claims 1 to 4, wherein the inclined member is provided in a W shape by alternately changing the inclined direction.

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