JP2015117060A - Storage container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a storage container with a floating closing body having a vibration control mechanism capable of effectively absorbing vibration energy against large earthquake vibration.SOLUTION: A gas holder 1 is provided with a cylindrical container 2 where a storage region is varied by a piston 3 being movable vertically. The piston 3 is equipped with a wheel 25 running while pressing the internal surface 7a of the cylindrical container 2 outward, a vibration control mechanism 40 being aligned in parallel with a viscoelastic body 41 and an elastic body 42 and acting to the internal surface 7a and a plurality of guide rollers 20 equipped in the respective items and disposed in the circumferential direction of the cylindrical container 2 with an interval.

Description

  The present invention relates to a container for storing a fluid, which includes a floating closure body such as a floating roof or a floating lid.

In cylindrical storage containers such as liquid storage tanks and gas storage tanks, and polygonal storage containers, the height of floating roofs and floating lids (hereinafter collectively referred to as floating closures) can be increased by increasing or decreasing the volume of stored items. Elevator is equipped so that the storage area can be adjusted and adjusted.
In the event of an earthquake, the floating closure will vibrate in the horizontal direction, and if it becomes unable to maintain the airtightness of the liquid or gas to be stored, or if the outer shell of the container or the floating closure is damaged, it will resume use. Large-scale construction is necessary to do.

  Conventionally, as disclosed in Patent Document 1 against earthquake motion, a method of absorbing vibration energy by installing, for example, rubber as a viscoelastic body around the entire circumference of a floating closure body, or disclosed in Patent Document 2 As described above, there is known a method of absorbing vibration energy without hindering up and down by a roller in which a viscoelastic body and a spring are connected in series so as to follow the deformation of the rail.

JP 2006-69627 A Japanese Unexamined Patent Publication No. 7-228447

  Although the conventional techniques disclosed in Patent Documents 1 and 2 can absorb vibration energy against earthquake motion, the present invention is a vibration damping that can effectively absorb vibration energy against large earthquake motion. It aims at providing the storage container provided with the floating type obstruction body provided with a mechanism.

For this purpose, the storage container according to the present invention, in which the storage area is fluctuated by a closing body that can be moved up and down, includes a first wheel in which the closing body travels while pressing the wall surface of the container, a viscoelastic body, and an elastic body. Are arranged in parallel, and a plurality of guide rollers each including a vibration damping mechanism acting on the wall surface are provided at intervals in the circumferential direction of the container.
According to the present invention, even if the closing body is greatly displaced in the horizontal direction at the time of an earthquake and a gap is generated between the guide roller and the container, by providing the elastic body in parallel with the viscoelastic body, the vibration damping mechanism can be It is easy to ensure contact with the head, and attenuation can be effectively obtained when swinging back.

  In the storage container of the present invention, when the guide rollers each include a pair of first wheels that are spaced apart from each other, the vibration control mechanism may be disposed between the pair of first wheels. preferable. Since the vibration damping mechanism is sandwiched between the pair of first wheels, even if expansion and contraction occurs in the vibration suppression mechanism, fluctuations in load accompanying expansion and contraction can be evenly distributed to the pair of first wheels, so that only one wheel is excessive. Can be avoided.

  Moreover, the storage container of this invention WHEREIN: It is preferable that a damping mechanism is equipped with the 2nd wheel which is supported by a viscoelastic body and an elastic body, and acts on a wall surface. Since the second wheel travels on the wall surface, smooth travel of the guide roller can be ensured.

  According to the present invention, even if the closing body is greatly displaced in the horizontal direction during an earthquake and a gap is generated between the container and the container, the elastic body is provided in parallel with the viscoelastic body, thereby The contact can be ensured and the damping can be effectively applied during the swing back.

It is a front view which shows the gas holder in this Embodiment. It is a figure which shows the schematic structure of the longitudinal cross-section of the gas holder of FIG. It is a figure which shows the schematic structure of the cross section of the gas holder of FIG. FIG. 2 shows a guide roller used in the gas holder of FIG. 1, where (a) is a guide roller applied to a region A facing north, and (b) is a guide roller applied to a region B facing south. It is a figure which shows a behavior when earthquake motion arises in the gas holder of FIG. It is a graph which shows the effect of the gas holder in this Embodiment. It is a figure which shows the example of arrangement | positioning of a guide roller provided with the damping device of this embodiment.

Hereinafter, the present invention will be described in detail based on embodiments shown in the accompanying drawings.
As shown in FIGS. 1 to 3, the gas holder 1 according to the present embodiment includes a cylindrical container 2 having a cylindrical outer shell structure, and a piston 3 that partitions the interior of the cylindrical container 2 up and down. The gas supplied from the gas inlet / outlet pipe 5 is stored in the storage space 4 formed below the piston 3, and the stored gas can be discharged through the gas inlet / outlet pipe 5.
The cylindrical container 2 is erected between base pillars 8 erected at predetermined intervals so that the side wall 7 surrounds the installation target position of the gas holder 1, and the base pillars 8. It is formed by the side plate 9 arranged toward the inside of the cylindrical container 2.

  The piston 3 is formed in a disc shape when seen in a plan view, and can be moved up and down along the inner wall surface 7a of the side wall portion 7. The lift position (vertical position) is a gas to the storage space 4. It changes according to the inflow and outflow. Further, around the piston 3, the space between the piston 3 and the inner wall surface 7a of the side wall portion 7 is sealed to prevent gas leakage from the storage space 4, and the piston 3 can slide smoothly up and down. A seal portion 10 for guiding the piston 3 is provided.

  As shown in FIG. 3, the seal portion 10 includes a guide roller 20, which abuts against the inner wall surface 7 a of the side wall portion 7 and travels along the inner wall surface 7 a of the side wall portion 7. This serves to guide the piston 3 up and down. As shown in FIG. 3, the gas holder 1 includes a plurality (24 in this embodiment) of guide rollers 20 with an equal interval in the circumferential direction of the piston 3. In addition, the gas holder 1 uses guide rollers 20 whose orientations are different on the south side and the north side. Specifically, in FIG. 3, a guide roller 20 called a fixed type is used in a region A facing the north side, and a guide roller 20 called a spring type is used in a region B facing the south side. Hereinafter, the guide roller 20A is used in the region A, and the guide roller 20B is used in the region B.

  The reason why this embodiment uses different guide rollers 20A and 20B depending on the direction in which it is facing is that the direction facing the south side receives more solar radiation than the direction facing the north side. That is, deformation due to thermal expansion of the cylindrical container 2 is large on the south side that receives strong solar radiation. Therefore, in the region B facing the south side, a guide roller 20B that supports the roller with a spring that is an elastic body is used so that the expansion and contraction of the cylindrical container 2 can be followed. On the other hand, in the region A facing the north side, deformation due to thermal expansion is at a level that does not hinder the travel of the guide roller 20A. 20A is used. Hereinafter, the structure will be described in the order of the fixed guide roller 20A and the spring type guide roller 20B.

As shown in FIG. 4A, the fixed guide roller 20A includes a pair of an upper roller 21A disposed on the upper side and a lower roller 22A disposed on the lower side. Since the upper roller 21A and the lower roller 22A have the same configuration except for the disposition, only the upper roller 21A will be described. The lower roller 22A is assigned the same reference numeral as the upper roller 21A in FIG. Description is omitted.
The upper roller 21 </ b> A includes a box-shaped bracket 23 that is fixed to the truss structure support 11 that is an element of the seal portion 10 via the shim 12, an axle 24 that is supported by the bracket 23, and an axle within the bracket 23. And a wheel (first wheel) 25 that is rotatably supported by 24. The wheel 25 abuts against the inner wall surface 7 a of the side wall portion 7 and rotates along the inner wall surface 7 a of the side wall portion 7.

The guide roller 20A includes a vibration damping mechanism 40 between the upper roller 21A and the lower roller 22A. The vibration damping mechanism 40 includes a viscoelastic body 41 and a roller 43 supported by the elastic body 42 in addition to the viscoelastic body 41 and the elastic body 42 as vibration damping elements.
The viscoelastic body 41 and the elastic body 42 are arranged in parallel, each having one end fixed to the support 11 and the other end fixed to the bracket 44 of the roller 43.
The roller 43 is a box-shaped bracket 44 to which the other ends of the viscoelastic body 41 and the elastic body 42 are fixed, an axle 45 supported by the bracket 44, and rotatably supported by the axle 45 inside the bracket 23. Wheels (second wheels) 46. The wheel 46 abuts against the inner wall surface 7a of the side wall portion 7 and rotates along the inner wall surface 7a of the side wall portion 7. The vibration damping mechanism 40 follows up and down of the upper roller 21A and the lower roller 22A. Guarantee to go up and down

Next, as shown in FIG. 4B, the spring-type guide roller 20B includes a pair of an upper roller 21B disposed on the upper side and a lower roller 22B disposed on the lower side. The configuration of the upper roller 21B and the lower roller 22B is the same as the guide roller 20A except that the arrangement is different.
The upper roller 21 </ b> B includes a support block 31 fixed to the support 11, a swing shaft 32 supported by the support block 31, a bracket 33 whose one end is rotatably supported by the swing shaft 32, and a bracket 33. An axle 34 to be supported, a wheel (first wheel) 35 rotatably supported on the axle 34 inside the bracket 33, a base end side of the bracket 33 is supported on the other end side, and a tip end of the support body 11. And a spring 36 to be pressed.

  The upper roller 21 </ b> B is configured such that the bracket 33 is supported on one end side by the swing shaft 32, and the other end side is capable of swinging movement toward or away from the support 11 by the spring 36. Therefore, when the spring-type guide roller 20B including the upper roller 21B and the lower roller 22B is provided in the region B facing the south side, even if the cylindrical container 2 expands and contracts due to strong solar radiation, the upper roller 21B and the lower roller 22B Following the expansion and contraction, the other end provided with the spring 36 is displaced, so that the smooth running of the guide roller 20B can be ensured.

  The guide roller 20B also includes the same vibration damping mechanism 40 as described above between the upper roller 21B and the lower roller 22B.

The vibration control mechanism 40 in this embodiment will be described in detail.
In the vibration damping mechanism 40, when the viscoelastic body 41 is subjected to vibration caused by an earthquake and the cylindrical container 2 is deformed, the guide roller 20 is caused to follow the deformation, so that vibration energy is not hindered without hindering the lifting and lowering of the piston 3. It is provided for the purpose of absorption.

  However, even if the viscoelastic body 41 is provided, the damping effect is not exhibited unless the viscoelastic body 41 physically contacts the inner wall surface 7a of the cylindrical container 2 directly or indirectly. Therefore, by providing the elastic body 42, the contact of the viscoelastic body 41 with the inner wall surface 7 a is ensured. In the present embodiment, the elastic body 42 is arranged in parallel with the viscoelastic body 41, so that the viscoelastic body 41 is arranged. The followability to the deformation of the cylindrical container 2 is made sensitive. This will be described with reference to FIG.

Now, as shown in FIG. 5, it is assumed that horizontal vibration is generated in the gas holder 1.
As shown by the arrow in FIG. 5 (a), when the guide roller 20R on the right side is moved to the left as shown by the arrow, the right guide roller 20R moves away from the inner wall surface 7a following the displacement of the piston 3 to the left side. Accordingly, the vibration damping mechanism 40 extends with both the viscoelastic body 41 and the elastic body 42.
After the maximum displacement of the piston 3 on the left side, there is a swing back toward the right side, and when the piston 3 returns to the neutral position shown in FIG. 5B, both the guide roller 20R and the guide roller 20L are controlled. The vibration mechanism 40 (viscoelastic body 41) is contracted to eliminate the above-described elongation.
Since the piston 3 passes through the neutral position and is now displaced to the right side, the guide roller 20L is separated from the inner wall surface 7a as shown in FIG. And the elastic body 42 extends.
While the ground motion is occurring, the above leftward and rightward shaking continues.

In the course of the vibration described above, the viscoelastic body 41 of the vibration damping mechanism 40 can absorb the energy due to the earthquake motion when contracting, and can reduce the response displacement of the piston 3. Accordingly, it is possible to effectively follow the contraction of the deformed viscoelastic body 41 with respect to the deformation of the cylindrical container 2, in other words, the displacement of the piston 3. Preferred above. For example, when the vibration damping mechanism 40 of the left guide roller 20L sufficiently extends following the displacement toward the right side of the piston 3 when swinging back from FIG. The efficiency of energy absorption is good when swinging back toward the left side.
At this time, if the elastic body 42 of the present embodiment has a force (stretching force) in a direction to stretch the viscoelastic body 41, it can assist the viscoelastic body 41 to stretch, Energy absorption can be performed effectively.

On the other hand, if the viscoelastic body 41 and the elastic body 42 are connected in series, the stretching force of the elastic body 42 does not assist the viscoelastic body 41 to stretch, but vice versa. It will work in the direction to shrink the elastic body 41.
Response when using the vibration damping mechanism 40 of the present embodiment in which the viscoelastic body 41 and the elastic body 42 are arranged in parallel, and when using the conventional vibration damping mechanism in which the viscoelastic body and the elastic body are arranged in series FIG. 6 shows the acceleration in comparison.

  In order for the vibration damping mechanism 40 to exhibit the above actions and effects, the elastic body 42 needs to have an elastic force (spring force) exceeding the resistance force of the viscoelastic body 41 in order to follow the response speed of the piston. It is. On the premise of this, as the viscoelastic body 41, a passive damper represented by an oil damper can be used. This includes damping dampers that have a low yield point steel material that is lower in strength and extremely ductile than mild steel, or a damper that has hard rubber sandwiched between a pair of steel plates. . As the elastic body 42, a coil spring is typically used. However, the present invention is not limited to this, and other springs such as a leaf spring can be used, and rubber can be used for the elastic body 42.

As described above, according to the gas holder 1 of the present embodiment, even if the piston 3 is greatly displaced in the horizontal direction at the time of an earthquake and a gap is formed between the cylindrical container 2, it is elastic in parallel with the viscoelastic body 41. By providing the body 42, the vibration damping mechanism 40 can be kept in contact with the cylindrical container 2 and can be effectively damped during the swing back.
Further, since the vibration damping mechanism 40 includes the roller 43, it does not prevent the piston 3 from moving up and down.
Further, since the vibration damping mechanism 40 is provided between a pair of upper and lower rollers (the roller 21A and the lower roller 22A, and the upper roller 21B and the lower roller 22B), even if the vibration damping mechanism 40 expands and contracts, Since the load fluctuation accompanying expansion and contraction can be evenly distributed to the pair of rollers, only one of the rollers can be prevented from receiving an excessive load.

  The preferred embodiments of the present invention have been described above. However, the configurations described in the above embodiments can be selected or changed to other configurations as appropriate without departing from the gist of the present invention. is there.

First, although the vibration control mechanism 40 is disposed, since it is necessary to exert an effect in the event of a ground earthquake, the vibration control mechanism 40 absorbs energy regardless of the direction in which the earthquake motion occurs. As shown to (a), it can arrange | position to all the guide rollers 20 arrange | positioned around the piston 3. FIG. In FIG. 7, the guide roller 20 including the vibration control mechanism 40 is painted black.
In addition to the above, the present invention may be, for example, every other location (FIG. 7 (b)) or half a circle (FIG. 7 (c)) if the required amount of vibration damping effect can be exhibited. Further, when the prevailing direction of the earthquake motion can be assumed in advance, a quarter of the prevailing direction indicated by the quantity arrow may be arranged in pairs (FIG. 7D).

  Moreover, although the piston 3 of the gas holder 1 was demonstrated above, the object of this invention is not restricted to this. For example, it can be applied to floating roofs of floating roof tanks used as crude oil storage tanks, partitioning the storage area of gas, liquid etc. stored in containers, and the amount of storage Accordingly, it can be widely applied to a closed body as a member that moves up and down accordingly. Moreover, although the planar shape showed the example of a cylindrical shape as a storage container, this invention is also applicable to the container which has a polygonal planar shape.

  Further, the gas holder 1 described above uses different guide rollers 20A and 20B depending on the facing direction, and the guide rollers 20A and 20B further include the upper roller 21A, the lower roller 22A, the upper roller 21B, and the lower roller 22B, respectively. However, the present invention is not limited to this. All the guide rollers arranged in the circumferential direction may be the same, or only one of the upper and lower guide rollers 20 may be provided.

DESCRIPTION OF SYMBOLS 1 Gas holder 2 Cylindrical container 3 Piston 4 Storage space 5 Gas inlet / outlet pipe 7 Side wall part 7a Inner wall surface 8 Base pillar 9 Side plate 10 Seal part 11 Support body 12 Shim 20, 20A, 20B, 20L, 20R Guide roller 21A, 22A Upper roller 21B, 22B Lower roller 23, 33 Bracket 24, 34 Axle 25, 35 Wheel 31 Support block 32 Oscillating shaft 36 Spring 40 Damping device 41 Viscoelastic body 42 Elastic body 43 Roller 44 Bracket 45 Axle 46 Wheel

Claims (3)

A storage container that fluctuates the storage area by a closing body that can be moved up and down,
The occlusion body is
A first wheel that travels while pressing the wall surface of the container;
A fluid characterized in that a plurality of guide rollers each having a viscoelastic body and an elastic body arranged in parallel and each having a vibration control mechanism acting on the wall surface are provided at intervals in the circumferential direction of the container. Storage container. The guide rollers are respectively
A pair of the first wheels arranged vertically spaced apart,
The vibration damping mechanism is disposed between the pair of first wheels.
The storage container according to claim 1. The vibration damping mechanism is
A second wheel supported by the viscoelastic body and the elastic body and acting on the wall surface;
The storage container according to claim 1 or 2.

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