JP2013032179A - Prefabricated concrete dike of steel tank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a prefabricated concrete dike of a steel tank in which a tank side plate does not deform and buckle due to earthquakes, tsunamis, floods or others and damages in which the tank floats or is flown is not generated by the tsunamis or the floods.SOLUTION: A concrete sidewall 6 which can be also as the dike of a continuous cylindrical or polygonal prefabricated concrete structure is stood and formed near the side plate 2 such that the steel tank 1 does not receive a damage such as a buckling deformation or flowing out due to the earthquakes, the tsunamis, or floods.

Description

  The present invention relates to a prefabricated concrete breakwater for a steel tank for storing a liquid of dangerous materials such as petroleum.

As shown in FIG. 9 of the conventional example, the general various steel tanks 1 are composed of a steel bottom plate 2, a steel side plate 3, and a steel roof plate 4, and the periphery of the tank yard 5 is Surrounded by a rectangular breakwater 6.
The width of the tank yard 5 and the height of the liquid breakwater 6 are designed so that the entire amount of the stored liquid in the tank 1 can be accommodated in case the stored liquid leaks due to a disaster such as an earthquake or an accident. .

There is a conventional patent application related to a breakwater installed around a steel tank via a leaked liquid storage area.
For example, Patent Document 1 (Japanese Patent Application Laid-Open No. 58-11691) “Tank High Breakwater Structure” includes a “high breakwater structure around a tank that is planted around a leaked liquid pool area. A configuration is disclosed in which the liquid bank and the side surface of the tank are connected by a connecting material, and thus a large number of the connecting materials are provided in the circumferential direction in the leakage liquid pool region at a predetermined interval.

  A conventional patent application related to a prefabricated concrete storage tank includes, for example, Patent Document 2 (Japanese Patent Laid-Open No. 4-113099) “Prefabricated Concrete Storage Tank”. In this application, “a prefabricated unit constituting a side wall of a concrete storage tank, a footing part in which the lower part of the side wall and the outer peripheral part of the bottom plate are rigidly integrated, a body part constituting a straight body part in the middle of the side wall, A configuration is disclosed in which the entire prefabricated unit is assembled and connected by a tension material at the upper part of the body constituting the ring beam portion.

  Patent Document 3 (Japanese Patent Laid-Open No. 7-62926) “Cylinder-shaped prestressed concrete tank and method for forming the tank” describes that four precast materials are stacked in the circumferential direction to form a lower cylinder C and an upper cylinder D. Is formed, and a PC steel rod is inserted in the longitudinal direction and a strand is inserted through the circumferential PC steel to introduce prestress in the longitudinal direction and the circumferential direction.

  Patent Document 4 (Japanese Patent Laid-Open No. 2004-44712) “Ground Tank Reinforcement Structure” relates to ground tanks and elevated floor type ground tanks that are supported by piles and reinforced bottom plates on the outer peripheral surface of the side wall of the ground tank body. The structure which arrange | positions the made PC liquid barrier is disclosed.

  In Patent Document 5 (Japanese Patent Laid-Open No. 2007-302281) “Tsunami Countermeasure Work for Ground Structure”, a self-supporting tsunami protection fence 2 is provided on the outside of the structure 1 installed on the ground, with heights H1 and H2. It is disclosed that it is set and installed.

Further, the application of Patent Document 6 (Japanese Patent Application No. 2011-122389) “Reinforcement structure and construction method for tank side plate lower part” by the present applicant is a place where deformation buckling is likely to occur due to an earthquake at the lower part of the outer side plate of a flat bottom cylindrical storage tank. A support frame body 6 that is spaced apart and placed at a predetermined width position, and a tension PC steel wire 8 that is stretched inside the support frame body 6 and / or on the outer peripheral surface of the support frame body 6. In addition, the reinforcing frame 6 is reinforced with the concrete 7 that is continuously placed inside the support frame 6.

Japanese Patent Laid-Open No. 58-11691 Japanese Patent Laid-Open No. 4-113099 JP-A-7-62926 JP 2004-44712 A JP 2007-302281 A Japanese Patent Application No. 2011-122389

The rectangular breakwater 6 surrounding the tank yard 5 of the conventional general steel tank 1 shown in FIG. 9 is assumed to accommodate the leaked storage liquid, and the breakwater 6 according to the size of the tank yard 5. The height is set. There is not enough consideration for natural disasters inside and outside the breakwater, such as tsunamis and storms caused by earthquakes. For this reason, there were concerns about damage to the breakwater due to a tsunami or a major flood, deformation or buckling of the tank side plate, or damage to the tank floating or flushing.
The conventional seismic design standards for various flat-bottom cylindrical steel tanks have been strengthened based on the experience of many earthquakes. For this reason, existing tanks prior to the revision of design standards include tanks that require reinforcement work to improve seismic performance.
In these tanks, there was a risk that the storage liquid leaked due to damage such as buckling and deformation of the side plate due to the earthquake.
In addition, if a part of the side plate of the tank is damaged due to buckling or the like due to an earthquake, the tank in service should not be emptied of the stored liquid without using a fire such as welding. Therefore, it was also desired to perform repair work in a short time.

  Patent Document 1 (Japanese Patent Application Laid-Open No. 58-11691) “Tank High Breakwater Structure” is a high breakwater structure with improved durability against the liquid pressure leaked around the tank. It does not correspond to disasters that occur from the earthquake, tsunami, or flood to the tank itself. In addition, the tank side plate and the breakwater are connected by a large number of connecting materials, but there is a concern that the tank side plate may be damaged by connecting those having different natural periods against shaking due to an earthquake.

  Patent Document 2 (Japanese Patent Laid-Open No. 4-113099) “Prefabricated Concrete Storage Tank” is a prefabricated unit that forms a side wall of a storage tank body divided into a footing part, a body part, and an upper part of the body, and after assembly, the whole is tensioned It is connected with materials and is not installed around the tank as a breakwater for countermeasures against earthquakes, tsunamis, floods, etc.

  Patent Document 3 (Japanese Patent Laid-Open No. 7-62926) “Cylinder-shaped prestressed concrete tank and method for forming the tank” describes that a precast material is stacked in a circumferential direction and a longitudinal direction to form a PC steel rod and a PC steel strand. However, it is not intended to be installed as a breakwater around the steel tank for measures such as earthquakes, tsunamis, and floods.

  Patent Document 4 (Japanese Patent Application Laid-Open No. 2004-44712) “Ground Tank Reinforcement Structure” relates to a ground tank and an elevated floor tank, and is supported by piles and a reinforced bottom plate on the outer peripheral surface of the side wall of the ground tank body. Further, a configuration in which a PC liquid breakwater is disposed is disclosed, but relates to a structure for preventing leakage of cryogenic liquid in a double-shell cryogenic tank for storing cryogenic liquid.

  Moreover, in patent document 5 (Unexamined-Japanese-Patent No. 2007-302281) "Tsunami countermeasure work of a ground structure", it is set and set to height H1 and H2 outside the structure 1 installed on the ground. Although the self-supporting tsunami protection fence 2 and the ground anchor, the girder, the reinforcing rib, etc. are disclosed, it is not a concrete wall structure covering the tank.

  Further, the application of Patent Document 6 (Japanese Patent Application No. 2011-122389) “Reinforcement structure and construction method of tank side plate lower portion” by the present applicant is for a predetermined height that tends to cause deformation buckling due to an earthquake for a tank having insufficient earthquake resistance. The part is reinforced with concrete and tension PC steel wire, but it is not installed as a liquid barrier with a prefabricated concrete structure for countermeasures such as earthquakes, tsunamis and floods.

  In this way, all of the conventional technologies have a structure of a tank breakwater that mainly responds to the leakage of the stored liquid and receives the stored liquid, and includes earthquakes, tsunamis, floods, etc. The tank is not protected by prefabricated concrete considering disasters from outside the tank breakwater.

The present invention has been made in view of the above-described problems of the prior art, and the object of the present invention is to prevent the tank side plate from being deformed or buckled by an earthquake, tsunami, flood, etc. The object is to provide a steel tank prefabricated concrete breakwater that does not cause damage such as the tank floating or being washed away by flooding.

  The steel tank prefabricated concrete breakwater according to the invention of claim 1 has a cylindrical or polygonal prefabricated concrete structure in the vicinity of the side plate so as not to be damaged by buckling deformation or runoff due to an earthquake, tsunami, flood or the like. It is characterized in that a continuous concrete side wall also serving as a breakwater is standingly formed.

  A prefabricated concrete breakwater for a steel tank according to a second aspect of the invention is a prefabricated concrete structure in which the concrete side wall of the first aspect comprises a pile, a bottom footing unit, a side wall lower unit, and a side wall upper unit. Then, it is formed in contact with the outer peripheral surface of the existing side plate.

A prefabricated concrete breakwater for a steel tank according to a third aspect of the present invention is a prefabricated concrete structure in which the concrete side wall of the first aspect comprises a pile, a bottom footing unit, a side wall lower unit, and a side wall upper unit. And standing up from the outer peripheral surface of the existing side plate at a distance to ensure the maintenance space, and provided with a damping material and a rainwater intrusion prevention cover between the concrete side wall and the tank side plate. To do.

  The steel tank prefabricated concrete breakwater according to the invention of claim 1 has a cylindrical or polygonal prefabricated concrete structure in the vicinity of the side plate so as not to be damaged by buckling deformation or runoff due to an earthquake, tsunami, flood or the like. Since the side walls of the concrete wall are used as a continuous breakwater, the side plates will not be deformed or buckled by earthquakes, tsunamis, floods, etc. There is no worry about it occurring. In addition, concrete walls can be constructed efficiently in a short period of time by combining factory production and local construction.

  A prefabricated concrete breakwater for a steel tank according to a second aspect of the invention is a prefabricated concrete structure in which the concrete side wall of the first aspect comprises a pile, a bottom footing unit, a side wall lower unit, and a side wall upper unit. In order to prevent deformation of the side plate due to deterioration over time and prevention of lifting of the bottom plate, the prefabricated concrete is made to contact the outer surface of the steel side plate with good workability. By improving the seismic strength of existing small and medium-sized tanks with insufficient seismic strength, it can be used for a long time.

A prefabricated concrete breakwater for a steel tank according to a third aspect of the present invention is a prefabricated concrete structure in which the concrete side wall of the first aspect comprises a pile, a bottom footing unit, a side wall lower unit, and a side wall upper unit. In this case, the steel plate is installed with a damping material and a rainwater intrusion prevention cover between the concrete side wall and the tank side plate. The tank can be prevented from shaking and buckling can be prevented. Further, in a tank that stores dangerous substances such as oil, the side plate can be inspected using the maintenance space. Further, rainwater does not enter and stay in the maintenance space even in heavy rain, and the tank can be prevented from rising.

It is a whole side explanatory view showing the 1st example of an embodiment of the prefabricated concrete liquid breakwater of the steel tank concerning the present invention. It is a whole side explanatory view showing the 2nd example of an embodiment of the prefabricated concrete breakwater of the steel tank concerning the present invention. It is a partial explanatory view of the concrete side wall of FIG.1 and FIG.2. It is explanatory drawing which shows the condition which made it contact | abut to the top angle of the upper end of a side plate, and provided the concrete side wall. It is explanatory drawing which shows the condition which provided the side wall with the elastic material interposed between the side plates in the example of a change of FIG. It is explanatory drawing which shows the condition which fixed the damping material to the top angle of the side plate upper end, and provided the concrete side wall apart from the side plate. It is explanatory drawing which shows the condition which fixed the damping material to the side-plate upper part position, separated from the side plate, and provided the concrete side wall. It is explanatory drawing which shows the condition which contacted the window girder provided in the side plate, and provided the concrete side wall apart from the side plate. It is explanatory drawing which shows the steel tank of a prior art example.

Embodiments of a prefabricated concrete breakwater for a steel 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 of the continuous side wall of a cylindrical or polygonal prefabricated concrete structure that also serves as a breakwater, and only a part is drawn and the detailed structure is omitted. Moreover, although this structure shows the case where it forms in the existing steel tank, you may employ | adopt for a new steel tank.

FIG. 1 is an overall side explanatory view showing a first embodiment of a prefabricated concrete breakwater of a steel tank 1 according to the present invention, wherein 2 is a side plate, 3 is a foundation, 4 is a bottom plate, and 5 is a roof.
The concrete reinforcement range of the steel tank according to the present invention is reinforced by standing the concrete side wall 6 also serving as a breakwater against the outer surface of the tank side plate 2 so as not to be damaged by an earthquake, tsunami, flood, or the like. Form.
A concrete wall 6 erected in contact with the outer peripheral surface of the side plate 2 includes a pile 7 driven into the outer peripheral edge of the foundation 3, and a bottom footing unit 6 a extending from the top of the pile 7 to the outer peripheral edge of the bottom plate 4. The upper side wall unit 6b and the upper side wall units 6c and 6d are formed into a prefabricated concrete structure.
In this way, when the concrete side wall 6 is provided in contact with the outer peripheral surface of the side plate 2, it is applied to a tank that does not require a maintenance space on the outer periphery of the side plate 2.
Further, even in a storage tank such as a water tank or a silo that does not require a liquid breakwater, it is possible to reinforce by providing a concrete side wall 6 in contact with the side plate 2 of the steel tank 1 without providing a space for maintenance. It is valid.

In this way, since it is reinforced with the concrete wall 6 also serving as a breakwater in contact with the side plate 2 of the flat bottom cylindrical steel tank, the seismic strength of the existing small-scale tank 1 with insufficient seismic strength is improved. Can do.
In addition, the side plate 2 can be prevented from being deformed and the bottom plate 4 can be prevented from rising due to disasters such as earthquakes and tsunamis and aging, and the tank equipment can be used for a long time by this seismic reinforcement.

FIG. 2 shows a case where a concrete side wall 6 also serving as a liquid barrier is installed upright to be separated from the side plate 2 so as to secure a space for maintenance in the second embodiment.
The concrete wall 6 is formed by driving a pile 7 on the outer peripheral portion of the foundation 3, standing a bottom footing unit 6a on the pile 7, and stacking a side wall lower unit 6b and side wall upper units 6c, 6d thereon. To do.
When the steel tank 1 that stores dangerous materials such as an oil tank and the maintenance space 9 is required around the side plate 2, the damping material 8 is fixed to the side plate 2 and separated from the side plate 2. The concrete side wall 6 is erected in contact with the outer periphery.
The damping material 8 that abuts against the concrete side wall 6 also has a role of suppressing horizontal shaking of the tank body and preventing rocking of the tank by suppressing the swinging of the tank.

  In this way, when the concrete side wall 6 that is also used as a breakwater is separated from the side plate 2, the pile 7 can be driven firmly into the outer peripheral portion of the foundation 3, so that the bottom footing unit 6 a is widely confirmed. The side wall lower unit 6b and the side wall upper unit 6c can be stacked thereon to form a liquid barrier structure that is strong against horizontal loads.

  By installing a concrete side wall 6 that is also used as a breakwater separately from the side plate 2, impact pressure due to tsunami and flood from the outside is covered by the concrete side wall 6. There is no risk of damage such as bending, and there is no risk of damage such as the tank 1 being floated or washed away by a tsunami or flood.

FIG. 3 is a partial explanatory view of the concrete side wall 6 shown in FIGS. 1 and 2.
For the concrete prefabricated member, the bottom footing unit 6a, the side wall lower unit 6b, and the side wall upper unit 6c, the steel bar 11a is inserted in the vertical direction, and the connecting material 11b is connected to the prefabricated fixing column 11 in the horizontal circumferential direction. Install and assemble to form a prefabricated concrete structure.
The prefabricated member made of concrete may be formed into a prefabricated concrete structure by using a PC steel rod in the vertical direction and a PC steel wire in the circumferential direction, and connecting and assembling by applying post tension.

As shown in FIG. 4, the concrete side wall 6 is provided in contact with the top angle 2 a at the upper end of the side plate 2. A sealing material 2b for preventing rainwater intrusion is provided on the top angle 2a and the upper edge of the concrete side wall 6.
The steel side plate 2 and the concrete side wall 6 are integrated to form an earthquake resistant structure with high rigidity.

FIG. 5 shows an example in which the side wall 2 of FIG. 4 is provided with a concrete side wall 6 in contact with a cushioning material 2c having elasticity.
The horizontal swing of the side plate 2 is absorbed by the buffer material 2 c and supported by the concrete side wall 6.

FIG. 6 shows an example in which the damping material 8 a is fixed to the top angle 2 a at the upper end of the side plate 2 and the concrete side wall 6 is provided at a distance from the side plate 2 for maintenance.
Reference numeral 9 denotes a maintenance space, and a covering material 10 is provided on the upper portion so that rainwater does not enter the space 9.
The damping material 8a is attached radially to the position of the top angle 2a of the side plate 2 at intervals in the circumferential direction, and a cushioning material 12a is interposed between the concrete side walls 6 on the outer periphery. The concrete side wall 6 suppresses the shaking of the steel tank at the time of an earthquake and also suppresses the locking of the tank.

FIG. 7 shows an example in which a damping material 8b is fixed to the outer peripheral surface of the upper part of the side plate 2 and a concrete side wall 6 is provided with a space 9 separated from the side plate 2.
The damping material 8b is attached radially at intervals in the circumferential direction of the side plate 2, and a cushioning material 12b is interposed between the concrete wall 6 on the outer peripheral edge thereof.
A covering material 10 is provided between the top angle 2 a and the concrete side wall 6 so that rainwater does not enter the space 9.
A low yield point steel is used for the damping material 8b. The vibration damping material 8b using the low yield point steel has the vibration damping material 8b itself damaged and deformed without damaging the side plate 2 and the vicinity of the fixed portion when the steel tank is swung due to an earthquake or the like. Form to absorb.

FIG. 8 shows an example in which a concrete side wall 6 is provided at a distance from the side plate 2 around the wind girder 13 attached to the side plate 2 by being supported by a support 13a.
In the tank in which the wind girder 13 is provided, the concrete side wall 6 is erected around the wind girder 13.
A buffer material 12c is interposed between the concrete wall 6 on the outer peripheral edge of the wind girder 13.
A drainage hole 14 is provided from the outer peripheral side surface of the wind girder 13 through the concrete side wall 6 so that rainwater is discharged to the outside of the concrete side wall 6. Rainwater does not enter the space 9 below the wind girder 13.

  Prefabricated concrete breakwaters are prefabricated units without using fires such as welding in the field, even in existing tanks and in-use tank facilities. By assembling the members and simplifying the construction by reducing the concrete placed on site, it can be reinforced with good workability in a short time.

In addition, when using precast concrete members, PC steel, and PC steel wires, the compressive force of the prestressed concrete can be replenished, and by bearing the hoop load with the tension of the PC steel and PC steel wires, It is possible to increase the durability against the load of the storage liquid and improve the earthquake resistance.

The above-mentioned prefabricated concrete breakwater can be applied not only to existing tanks, but also to new tanks that require improved seismic performance, tsunami countermeasures, strong winds and flood countermeasures, or structures such as water tanks, silos, and monuments. can do.

1 tank
2 side plate
2a top angle
3 basics
4 bottom plate
5 roofs
6 concrete side walls
7 piles
8 damping material
9 spaces
10 wrapping materials
11 Prefabricated anchor pillar
11a steel bar
11b connecting material
12 cushioning material
13 wind girder
14 drainage holes

Claims (3)

  In order to prevent steel tanks from being damaged by buckling deformation and runoff due to earthquakes, tsunamis, floods, etc., a continuous concrete side wall with a cylindrical or polygonal prefabricated concrete structure is also installed near the side plate. Prefabricated concrete breakwater with steel tank, characterized by forming.   The said concrete side wall is a prefabricated concrete structure which consists of a pile, a bottom part footing unit, a side wall lower unit, and a side wall upper unit, and is made to contact | abut to the existing side-plate outer peripheral surface, It forms. Steel tank prefabricated concrete breakwater. The concrete side wall is a prefabricated concrete structure composed of a pile, a bottom footing unit, a side wall lower unit, and a side wall upper unit, and is erected at a distance to secure maintenance space from the outer peripheral surface of the existing side plate. 2. The prefabricated concrete revetment for steel tanks according to claim 1, wherein a damping material and a rainwater intrusion prevention cover are provided between the concrete side wall and the tank side plate.

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