JPH07125794A - Square silo for granulated solid - Google Patents

Abstract

PURPOSE:To improve storing efficiency and heat insulating function by forming the storing space of granulated solid into a square shape by the steel partition walls having a double shell structure. CONSTITUTION:A rectangular frame having horizontal sides X1 and vertical side Y1 is formed by the walls 12 having a double shell structure and the interior of the rectangular frame is divided into a plurality of rectangular spaces 14 by the partition walls 13 having a double shell structure. The corners 15 are formed consisting of an outer arcuate part 16 and an inner arcuate part 17. Two inner arcuate parts 17 are made up at a T-shaped part 19 lying in a plane 18 and formed by connecting the partition wall 13 perpendicularly to the wall 12 having the double shell structure. Four inner arcuate parts 17 are likewise made up at a crossed part 20 formed by intersecting the partition walls 13 at right angles. Since in this way the corner parts are connected in an arcuate form, the concentration of an excessive stress is prevented to permit the strength required of the corner part to be reduced. In each of the aforesaid spaces, an inner shell steel plate resists the inner pressure as a film and the entire partition walls resist the inner pressure as flexural rigidity.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rectangular solid silo of granular solids for storing coal and various ore raw materials.

[0002]

2. Description of the Related Art Conventionally, a cylindrical silo 1 as shown in FIG. 8 has been used as a silo of solid particles. When using coal as a granular solid, for example, as a fuel for a thermal power plant, it is necessary to store it in plural types classified according to the place of production. That is, when storing six types of coal, including the reserve, 12
A group of base cylindrical silos 1 is required.

A cylindrical silo 1 has a cylindrical steel partition wall 2. The steel partition wall 2 is made by bending a thick steel plate at the factory.
It is assembled as a cylindrical steel partition wall 2 having a radius R. It is necessary to provide a space represented by D between the cylindrical silos 1 to secure a space for assembly. As a whole, FIG.
It is necessary to provide an inter-silo space 3 shown by hatching.

In the prior art disclosed in Japanese Unexamined Patent Publication No. 62-287879, an object is to combine a square silo and a cylindrical silo so as not to generate the inter-silo space 3 that occurs when only the cylindrical silo is used. There is. In order to achieve this purpose, the partition of the rectangular silo is reinforced by a cylindrical silo.

[0005]

As shown in FIG. 8, the area of the inter-silo space 3 becomes large when the required number of cylindrical silos 1 are constructed on the site. This inter-silo space 3 cannot be used for storage, and it is difficult to use it effectively. For this reason, there is a drawback that the storage efficiency per unit site area becomes low for the entire X × Y rectangular site. Further, since the steel plate forming the steel partition wall 2 has a low heat insulating property, the temperature of the coal stored may increase due to direct sunlight or the like, and spontaneous combustion may occur.

In order to improve the storage efficiency of the space, it is effective to use the prismatic group silo instead of the cylindrical group silo. However, in the case of the rectangular shape, the bending moment applied to the partition wall becomes large, and in order to secure the required strength, it is necessary to make the thickness of the partition wall considerably thick if the single shell structure is kept. Therefore, the construction cost including the material cost, the transportation cost, and the construction cost becomes enormous.

When concrete is used as the partition wall, the heat insulating property is increased, and spontaneous combustion is unlikely to occur even when coal or the like is stored. However, almost all the construction work must be done on the premises, which requires a huge construction period. In the prior art of Japanese Patent Laid-Open No. 62-287879 mentioned above,
Although there is no direct description of the material forming the partition walls, it is easily presumed that it is made of concrete.

An object of the present invention is to provide a rectangular solid silo of granular solids using a steel partition wall having high storage efficiency and good heat insulation.

[0009]

DISCLOSURE OF THE INVENTION The present invention is a prismatic solid silo of granular solids, characterized in that the storage space of the granular solids is formed into a square shape by a steel partition of double shell structure.

Further, the steel partition wall of the double shell structure of the present invention includes an inner shell steel plate which receives internal pressure, an outer shell steel plate which surrounds the inner shell steel plate with a space therebetween, an inner shell steel plate and an outer shell steel plate. To connect
It is characterized by including a diaphragm that divides a space formed between the inner shell steel plate and the outer shell steel plate into a plurality of sections.

The storage space of the present invention is characterized in that it is divided into a plurality of rectangular spaces by a steel partition having a double shell structure.

The corners of the rectangular space according to the present invention are characterized by being formed in a smooth arc shape.

[0013]

According to the present invention, the storage space for the granular solids is formed in a square shape by the steel partition having the double shell structure. Since it has a double-shell structure, it has high strength and good heat insulation.

Further, according to the present invention, the inner shell steel plate and the outer shell steel plate forming the partition wall of the double shell structure are connected by a diaphragm. The diaphragm partitions the space formed between the inner shell steel plate and the outer shell steel plate into a plurality of sections. In each of the partitioned sections, when the internal pressure acts, the inner shell steel plate behaves as a membrane supported around the periphery by the diaphragm. This internal pressure is transmitted to the outer shell steel plate via the diaphragm, and the entire double shell structure formed by the inner shell steel plate and the outer shell steel plate resists the internal pressure due to bending deformation. Since the diaphragm is provided between the inner shell steel plate and the outer shell steel plate, the bending rigidity is large, and even if the thickness of the inner shell steel plate, the outer shell steel plate, the diaphragm, etc. is small, it can withstand a large bending load. can do.

Further, according to the present invention, the storage space is divided into a plurality of rectangular spaces by the steel partition having a double shell structure. Since no dead space is generated between the divided rectangular spaces, the storage efficiency per unit site area can be increased.

According to the invention, the corners of the rectangular storage space are formed in a smooth arc shape. Although the corner portion maximizes the bending moment generated by the internal pressure, excessive stress concentration can be avoided by forming the corner portion in a smooth arc shape. Since the corners are arcuate, it is possible to reduce the decrease in storage efficiency per unit area due to the partition wall arcuate.

[0017]

1 is a plan view of a steel square silo 11 according to an embodiment of the present invention. The steel square silo 11 is configured by the double-shell structure partition wall 12 into a rectangle of horizontal X1 and vertical Y1. The inside of this rectangle is divided into a plurality of rectangular spaces 14 by a partition wall 13 having a double shell structure similar to the double shell structure partition wall 12. In the case of the present embodiment, twelve rectangular spaces 14, including spares, are provided to mix six types of coal. The size of the rectangular space 14 is horizontal X2 and vertical Y2.

The steel square silo 11 is basically composed of a planar double-walled partition wall 12 and a partition wall 13. However, the corners such as the outer corner 15 are formed in an arc shape by the outer arc 16 and the inner arc 17. In addition, the partition wall 13 having the double shell structure partition 12 in the shape of a plane 18 is
In the T-shaped portion 19 in which is connected vertically, the two inner circular arcs 17
Is formed. In the cross portion 20 where the partition walls 13 cross each other in a cross shape, four inner arcs 17 are similarly formed.
Since the corner portions are connected in an arc shape in this manner, excessive stress concentration can be prevented and the strength required at the corner portions can be reduced.

For example, in a 420,000 ton silo having a storage height of 40 m, the lateral length X1 of the steel square silo 11 is 21.
The vertical length Y1 is 113 m. The rectangular space 14 has a horizontal length X2 of 50 m and a vertical length Y2 of 34 m. The equivalent cylindrical silo is shown in FIG.
Then, X = 215 m, Y = 160 m, and R = 25 m.
Comparing site areas, square: cylindrical = 23100: 3
It becomes 4400.

FIG. 2 is a sectional view taken along the section line II-II in FIG. The steel square silo 11 is covered with a double-shell ceiling 21. The double shell structure ceiling 21 has the same structure as the double shell structure partition wall 12 and the partition partition wall 13. The double shell structure ceiling 21 is supported by the double shell structure partition 12 and the partition partition 13. The double shell structure partition 12 and the partition partition 13 are formed on a concrete foundation 22. A hopper 23 made of concrete is further formed on the foundation 22. A belt conveyor 24 is arranged at the bottom of the hopper 23, and the stored items can be conveyed in a direction perpendicular to the paper surface of FIG. Above the double shell structure ceiling 21, a belt conveyor 25 for supplying coal to each rectangular space 14 is provided. The coal conveyed on the belt conveyor 25 is supplied to the rectangular space 14 through a supply port formed in the double shell structure ceiling 21. Double shell structure ceiling 2
The ridge portion 26, which is the connection portion between the 1 and the double shell structure partition wall 12,
It is formed in an arc shape to avoid stress concentration.

FIG. 3 shows the basic structure of the double shell structure partition wall 12. The double-shell structure partition 12 is basically composed of an inner shell steel plate 31, an outer shell steel plate 32 and a diaphragm 33. The diaphragm 33 is a steel plate, and the inner shell steel plate 31
The outer shell steel plate 32 is a structural member that maintains the shape by connecting the outer shell steel plate 32 with a gap. A space between the inner shell steel plate 31 and the outer shell steel plate 32 is partitioned by a diaphragm 33 into a plurality of sections. In this section, the inner shell steel plate 31 and the outer shell steel plate 32 are reinforced by the vertical reinforcing rigid member 34 and the lateral reinforcing rigid member 35.

In a section where both the inner shell steel plate 31 and the outer shell steel plate 32 are flat plates, the interval L1 at which the diaphragm 33 is provided is, for example, 3 m. The distance L2 between the diaphragms 33 of the portion connected to the outer corner portion 15 is, for example, 3 m. Distance L3 of diaphragm 33 in T-shaped portion 19
Is, for example, 4 m. Inner shell steel plate 31 and outer shell steel plate 32
The distance L4 between and is, for example, 2 m. The diaphragm 33 is not limited to the vertical direction as shown in FIG.
It is also installed horizontally.

FIG. 4 shows the structure of the cross portion 20 of FIG.
The cross portion 20 is formed such that the division intervals 13 intersect the cross shape. Each partition space 13 has inner shell steel plates 31 on both sides, and the spaces are connected by a diaphragm 33. The partition walls 13 are connected to each other by an inner circular arc 17.

5, 6 and 7 show details of the double shell structure. 5 shows the ridge portion 26 of FIG. 2, FIG. 6 shows a state seen from the section line VI-VI of FIG. 3, and FIG. 7 shows a state seen from the section line VII-VII of FIG. Ridge 26
Then, the inner shell steel plate 31 and the outer shell steel plate 32 are reinforced by the T-shaped reinforcing ribs 36 and the lateral reinforcing rigid members 35. FIG. 6 and FIG. 7 show the double-shell structure partition wall 12 in a state where the flat surface 18 is formed. The lateral reinforcing rigid member 35 also has a T-shape, and the width W of the tip portion is, for example, 0.2 m. Diaphragm 3
Vent holes 37 are formed in the nozzle 3. If it is breathable, it becomes possible for an operator to perform welding work inside when assembling the double-shell structure partition wall 12 and the partition wall 13.

When coal is stored in the rectangular space 14, the inner pressure due to the weight of the coal is applied to the inner shell steel plate 31. The inner shell steel plate 31 in the portion to which the internal pressure is applied is partitioned by the diaphragm 33, and thus resists the internal pressure as a film in each partition.
This resistance force is transmitted through the diaphragm 33 to the outer shell steel plate 32 of the double shell structure partition wall 12 and the inner shell steel plate 3 of the partition wall 13.
1 is transmitted. Double shell structure partition 12 and partition partition 13
Resists internal pressure due to bending stiffness as a double shell structure. Therefore, even if the bending moment becomes large near the corner of the rectangular space 14, the inner shell steel plate 31 and the outer shell steel plate 32 having a small thickness can easily resist. Square space 14
Since the corners are connected by the outer circular arc 16 and the inner circular arc 17, excessive stress concentration can be avoided and the wall thickness required for the inner shell steel plate 31 and the outer shell steel plate 32 can be reduced. Although the storage efficiency per unit area is slightly reduced by making the arc shape, it has a small effect on the overall storage efficiency because it is a limited part of the corner.

Further, the steel square silo 11 of this embodiment is
Since it is surrounded by the double shell structure partition wall 12 and the double shell structure ceiling 21, an air layer is interposed between the inner shell steel plate 31 and the outer shell steel plate 32, and the heat insulating property is improved. As a result, it is possible to prevent a rise in the temperature of the coal and a spontaneous combustion associated with the rise in the temperature of the coal even when exposed to direct sunlight. In addition, since it is light in weight as a whole, it is easy to transport, can be manufactured in advance as a large part in a factory, and can shorten the construction period and realize a low construction cost.

[0027]

As described above, according to the present invention, by using the steel partition wall having a double-shell structure, a granular solid silo having a good storage efficiency per unit area and a good heat insulating property is realized. be able to.

Further, according to the present invention, the steel partition wall having a double shell structure includes an inner shell steel plate, an outer shell steel plate and a diaphragm. The diaphragm partitions the space formed between the inner shell steel plate and the outer shell steel plate into a plurality of sections. In each of the partitioned sections, the inner shell steel plate behaves as a film and resists the internal pressure. The double-shell steel partition wall as a whole resists internal pressure with bending rigidity. Therefore, the required strength can be secured even when the thickness of the inner shell steel plate, the outer shell steel plate, the diaphragm, etc. is small, and the material used for the steel partition wall can be reduced. Further, since the weight of the steel partition wall is reduced, the work such as transportation and assembly is facilitated, and the work period required for the work is shortened. In addition, most of the factories can carry out the work of manufacturing the double-shell structure bulkhead,
Quality control becomes easy. Due to the high rigidity of the factory-assembled steel bulkhead components as a double shell structure, their transportation is much easier than that of curved silo bulkhead components.

Further, according to the present invention, since the storage space is partitioned into a plurality of rectangular spaces by the steel partition having the double shell structure, no extra dead space is generated between the partitioned rectangular spaces. This increases the space utilization efficiency of the entire silo group, especially when it is necessary to store multiple types of granular solids.

Further, according to the present invention, the corners of the rectangular storage space are formed in a smooth arc shape. As a result, excessive stress concentration can be avoided and the material used can be saved.

[Brief description of drawings]

FIG. 1 is a bottom view of an embodiment of the present invention.

FIG. 2 is a sectional view taken along the section line II-II in FIG.

FIG. 3 is an enlarged view of a main part of the double-shell structure partition wall 12 of FIG.

FIG. 4 is an enlarged view of a cross portion 20 of FIG.

5 is an enlarged view of a ridge portion 26 of FIG.

6 is a cross-sectional view taken along the section line VI-VI in FIG.

FIG. 7 is a sectional view taken along section line VII-VII in FIG.

FIG. 8 is a simplified plan view of a conventional cylindrical silo group.

[Explanation of symbols]

 11 Steel Square Silo 12 Double Shell Structure Partition 13 Partition Partition 14 Square Space 15 Outer Corner 16 Outer Arc 17 Inner Arc 21 Double Shell Structure Ceiling 31 Inner Shell Steel Plate 32 Outer Shell Steel Plate 33 Diaphragm 34 Vertical Reinforcing Rigid Material 35 Horizontal Reinforcing rigid material 36 Reinforcing rib

Claims (4)

[Claims] 1. A prismatic silo of granular solids, wherein the granular solids storage space is formed into a square shape by a steel partition having a double shell structure. 2. The steel partition wall having a double shell structure includes: an inner shell steel plate that receives an internal pressure; an outer shell steel plate that surrounds the inner shell steel plate with a space between the inner shell steel plate; The rectangular silo of granular solid according to claim 1, further comprising a diaphragm that divides a space formed between the inner shell steel plate and the outer shell steel plate into a plurality of compartments. 3. The prismatic silo of granular solid according to claim 1, wherein the storage space is divided into a plurality of prismatic spaces by a steel partition having a double shell structure. 4. The rectangular silo of granular solid according to claim 1, wherein a corner of the rectangular space is formed in a smooth arc shape.