JPH0374745B2 - - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" This invention is directed to the construction of iron plate silos installed to store agricultural products such as grains, or raw materials such as mine resources and livestock feed for a long period of time. Regarding the method.

"Conventional technology" Traditionally, silos used to store grain, granular materials such as mine resources, and livestock feed for long periods of time have been constructed into reinforced concrete silos, iron plate silos, etc., depending on the type of materials that make up the outer shell. Separated. In recent years, steel plate concrete silos have been developed in which a steel plate silo is constructed for the purpose of high airtightness, high heat insulation, etc., and then concrete is poured to surround the peripheral wall of the steel plate silo, and this concrete becomes the outer wall of the silo body. Silos, called silos, began to be actively constructed.

FIG. 7 is a diagram showing an example of a conventional iron plate silo or an iron plate silo that is the inner wall of an iron plate concrete silo. In FIG. 7, reference numeral 1 denotes an iron plate silo installed on a support structure 2 that has been constructed in advance on a quay or the like. This iron plate silo 1 is
The hopper 3 is formed into a cylindrical shape whose inner diameter is substantially the same throughout, and a hopper 3 is attached to the lower end of the cylindrical shape.

In order to construct the iron plate silo 1 as described above, a cylinder body is created by dividing the iron plate silo 1 into circular slices at a factory, and these cylinder bodies are carried to the vicinity of the support structure 2, and these cylinders are cut downward. Weld them one by one and stack them upwards, and after the whole is assembled, we conduct an airtightness test to find any defects, and if any defects are found, we repair them and complete the steel plate silo 1. The common method is to complete the process.

However, as mentioned above, the inner diameter of the iron plate silo 1 is approximately the same throughout the silo 1, so
When transporting the cylindrical bodies, there is a drawback that it is difficult to save transport space by stacking the cylindrical bodies. In particular, since the cost of transportation depends more on the capacity of the transported object than on its weight, the method of constructing iron plate silos inevitably results in increased costs during transportation. Therefore, a method of constructing an iron plate silo has been used in which the cylindrical body is further divided into smaller parts to reduce the space during transportation and reduce the transportation cost.

"Problems to be Solved by the Invention" By the way, as is well known, the silo 1 can store agricultural products such as grains, salt, sugar, fertilizer, cement, mineral resources, chips, lime, coal, and even livestock. Silo 1 is designed to store raw materials for a long period of time, so in order to store these raw materials for a long period of time safely and with minimal deterioration of the raw materials, this silo 1 is equipped with durable materials. In addition to weather resistance, buckling strength, and earthquake and fire resistance to maintain the property's properties, there are strict requirements for performance such as moisture resistance to prevent condensation, airtightness to provide epidemic prevention, and insulation to prevent the progression of rot. . In particular, imported grains, etc. are subject to the prescribed inspections under the Plant Protection Law, and if there is a problem with epidemic prevention, disinfection measures are taken, but normally, agents such as methyl bromide are gasified and stored in Silo 1. A method of fumigating the grain by enclosing it is used, and in these cases, particularly high airtightness is required.

However, in the conventional method of further dividing the steel cylindrical body and transporting it to the site and assembling the silo body 1 by welding them one by one on site, welding is an on-site work. To,
In addition to being affected by environmental factors such as weather and equipment, the workability is also poor, making it impossible to ensure welding accuracy, which is a major factor in ensuring the airtightness of silo 1, or to ensure it. It requires construction period, equipment, etc., and is extremely costly.
I had a problem like this. For this reason, it is necessary to transport the iron plate silo 1 in a relatively large unit like the cylindrical body and ensure airtightness after assembly, even at the cost of rising transportation costs. There were cases where it was not possible.

This invention can reliably ensure welding accuracy, which is an important factor in achieving high airtightness, which is one of the important functions of a silo, and has excellent workability.
The problem is how to construct a steel plate silo that requires a short construction process and low transportation costs.

``Means for Solving the Problems'' This invention provides a method for constructing a steel plate silo, including the process of dividing and manufacturing a cylindrical steel silo with a changed inner diameter into a plurality of cylindrical units, and a step of transporting the plurality of units with the remaining units housed in the unit having a
a step of installing the silo by assembling a plurality of transported units; and a step of assembling the plurality of units into a largest unit having the largest inner diameter, and at least one or more sets assembled on the largest unit. and an upper unit, and a hakama is provided at the lower end of the assembly unit, the diameter of which gradually increases as it goes downwards, and the diameter of the peripheral edge is approximately the same as the diameter of the unit located directly below when the unit is assembled. The above problem is solved by forming a section.

"Function" According to the present invention, since the iron plate silo can be manufactured in a factory as a relatively large unit, on-site welding of the body welding part, which greatly affects the airtight performance of the silo body, can be extremely reduced. In addition, when transporting this iron plate silo, it is divided into multiple units, and the remaining units are stored in the unit with the largest inner diameter for transport, so each unit requires a large amount of transport space. do not.

"Embodiments" Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIGS. 1 to 7 are diagrams for explaining a method of constructing an iron plate silo, which is an embodiment of the present invention. First, in FIG. 1, reference numeral 1 denotes an iron plate silo installed on a concrete support structure 2 installed in advance on a quay or the like, similar to the conventional iron plate silo. This iron plate silo 1 is formed so that its inner diameter can be changed in three stages, and the inner diameter becomes narrower as it goes upward.
That is, in the illustrated example, D ₁ >D ₂ >D ₃ .
Furthermore, beams 5, 5, . . . for pouring top slabs are provided at the upper end of the iron plate silo 1, and bases 6, 6 for mounting the support structure 2 are provided at the lower end.

Similar to the conventional iron plate silo, this iron plate silo 1 is once assembled at a factory, and then divided into three parts at the stepped portion (points a and b in Figure 1) where the silo inner diameter changes, and each is divided into three cylindrical silos. The units are 4a, 4b, and 4c. Alternatively, these silo units 4 can be assembled without being assembled once.
Of course, it is also possible to directly manufacture a, . . . and transport them. Here, the silo unit 4a is the largest unit 4a, and the silo units 4b and 4c are assembled units 4b and 4 that are assembled on the largest unit 4a.
It is c. Further, at the lower ends of the assembly units 4b and 4c, there is a hakama part 4d which gradually increases in diameter as it goes downward and has a circumferential edge approximately the same diameter as the diameter of the unit located directly below when the units are assembled. is formed.

Next, after constructing these silo units 4a,...
Temporary beams 7, 7, ... for loading and unloading are attached to the lower end of the silo unit 4a and the upper end of the silo unit 4b, and the remaining silo units 4b, 4c are placed vertically and vertically inside the silo unit 4a having the largest inner diameter. They are stored in an inverted state, and cushioning materials 8, 8, etc., such as styrene, are filled between them. These integrated silo units 4a, 4
b, 4c are loaded onto a transport ship 11 using a lifting device 9 and a lifting machine 10, and the bases 6, 6 of the silo unit 4a are fixed to a fixed frame 12 on the transport ship 11. Here, the means of transporting the silo units 4a,... is not limited to the transport ship 11, but it is important to note that the silos 1 are often built along the coast where shipping is convenient, and the silo units 4a,... are manufactured. Considering that many large steel mills are also located along the coast or canals, transport ships 11
It can be said that transportation by sea means such as

After transporting the silo units 4a,... to the quay 13 near the silo 1 construction site by the transport ship 11, the silo units 4a,... are integrated by the lifting equipment 9 and the lifting machine 10, as in the case of loading the silo units 4a,... Transport ship 1 transports silo units 4a, 4b, 4c
1 to the quay 13. Here, quay 13
The silo unit 4a, ... mounting frame in
Although it may be prepared in advance, the fixed mount 12 used during transportation by the transport ship 11 may be reused.

After unloading the silo units 4a, . . ., the silo units 4a, . Since the silo units 4b and 4c are housed in the silo unit 4a upside down, they cannot be assembled into a predetermined shape in this state. Therefore, it is necessary to turn the silo units 4b and 4c upside down again to change their orientation to the state assembled at the factory. For this, first, hanger 1
4 is engaged with the top slab pouring beams 5, 5 or temporary beams 7, 7, and then the silo unit 4 is
With the shape retaining jig 15 inserted into the upper end opening of silo units 4b and 4c,
are sequentially lifted up and extracted from the silo unit 4a using the lifting tool 14 and the lifting machine 10, and transported to the inversion machine 16 for upside-down reversal to perform the inversion work.

The shape retaining jig 15 is attached to the silo unit 4.
In order to prevent deformation of the upper end openings of b and 4c,
As shown in FIG. 6, spokes 15c, 15c, . 15
d, 15d, ... are these spokes 15c, 15
c, . . . Also,
The reversing machine 16 is connected to the silo units 4b, 4.
As shown in FIG.
and a base 16b that rotatably supports the.

Then, the silo units 4b, 4c are turned upside down by the reversing machine 16, and the remaining silo unit 4a is moved to the lifting tool 1 with the shape retaining jig 15 inserted into the opening at the upper end of the unit.
4 and the lifting machine 10 onto the support structure 2 installed at the predetermined position, and further fix the unit bases 6, 6 and the support structure 2 with anchor bolts or the like. The silo unit 4a is installed on the support structure 2. Then, the silo units 4b and 4c are sequentially placed on the silo unit 4a, and the outer circumferential surfaces are welded on site to assemble the entire silo 1, thereby constructing an iron plate silo on the support structure 2.

From this point on, the work of attaching the auxiliary equipment constituting the iron plate silo 1 may be done by conventional means. Further, if necessary, concrete may be placed around the iron plate silo 1 to form a steel plate concrete silo.

The iron plate silo 1 is constructed by the method described above. Here, most of the welding work when manufacturing and assembling the steel plate silo 1 is performed in a well-equipped factory, so work efficiency is extremely good, and the weather, especially the environment, has a large effect on welding accuracy. There is no need to worry about controlling temperature, humidity, etc., and it is therefore possible to ensure welding accuracy, which affects airtightness, which is one of the important functions of a silo.

Further, the iron plate silo 1 is divided into three silo units 4a, 4b, 4 when transported by a transport ship 11 or the like.
The remaining silo units 4b and 4c are divided into silo units 4b and 4c within the silo unit 4a which has the largest inner diameter.
Since the unit is stored and transported, the transportation space occupied by the unit can be reduced compared to the conventional case of transporting cylindrical bodies of the same diameter, and this can contribute to a reduction in transportation costs. It becomes possible. Furthermore, since transportation in large units is possible, the workability is improved and the number of assembly steps at the site can be reduced.

Therefore, according to the embodiments described above, it is possible to reliably ensure welding accuracy, which is an important factor in obtaining high airtightness, which is one of the important functions of a silo, and also to have excellent workability. , it becomes possible to realize a method for constructing iron plate silos that requires a short construction process and low transportation costs.

Further, at the lower ends of the assembly units 4b and 4c, there is provided a hakama part 4d which gradually increases in diameter as it goes downward and has a circumferential edge approximately the same diameter as the diameter of the unit located directly below when the units are assembled. Since the assembled unit 4 has a smaller diameter than the largest unit 4a,
b and 4c can be easily assembled in one place in almost no time and without any steps, and since there is no time, the units can be welded together easily and safely.

In addition, since the above-mentioned hakama parts 4d are formed at the lower ends of the cylindrical assembly units 4b and 4c, the height and area of the installation location are as shown below as a silo that requires a certain storage capacity. Can be made smaller. That is, for example, a silo semi-finished product formed into a conical cylindrical shape, and a plurality of semi-finished products each having a conical cylindrical shape concentrically stacked inside the silo semi-finished product, the lower end of which is the upper end of the outer semi-finished product. If a conical cylindrical silo is constructed by repeatedly pulling it up and fixing it until it reaches , the diameter of the silo will gradually decrease as it goes upwards, and a step will occur due to the thickness of the iron plate. In order to make this silo have the same storage capacity as the embodiment of the present invention, it is necessary to make the height of the silo higher than that of the embodiment, or to increase the bottom area, that is, to increase the area of the installation location. In order to increase the height of the silo, a large number of semi-finished products must be used, which not only takes time and effort, but also makes positioning difficult and requires a large number of welding points, resulting in a large amount of construction work. However, in the embodiment described above, this drawback can be overcome.

Note that the method of constructing an iron plate silo according to the present invention is not limited to the above embodiment. For example, the shape of the iron plate silo 1 is not limited to a cylindrical shape, but may be a rectangular tube shape. Furthermore, the method of transporting and hoisting the silo units 4a, . . . is not limited to the method of the embodiment described above, but may be appropriately selected from known means. In addition, the cut points of the iron plate silo 1 are not limited to points a and b in Fig. 1, but together with the number of inner diameter changing parts in the iron plate silo 1, the iron plate silo 1 can be cut and divided into sizes suitable for transportation. It would be good if it were done.

"Effects of the Invention" As explained in detail above, according to the present invention, there is a process of dividing and manufacturing a cylindrical steel silo with a changed inner diameter into a plurality of cylindrical units, and The method for constructing an iron plate silo is comprised of a step of transporting a plurality of units with the remaining units stored in the unit, and a step of assembling the transported plurality of units to install the silo. Therefore, most of the welding work when manufacturing and assembling the steel plate silos can be done in a well-equipped factory, which makes the work extremely easy and free from weather conditions, especially environments that have a large effect on welding accuracy. There is no need to worry about controlling temperature, humidity, etc., and it is therefore possible to ensure welding accuracy, which affects airtightness, which is one of the important functions of a silo. In addition, the iron plate silo is divided and manufactured into multiple units during transportation, and the remaining units are stored in the unit with the largest inner diameter for transportation. Compared to the case where the unit is transported, the transport space occupied by the unit can be reduced, thereby contributing to a reduction in transport costs. Furthermore, since transportation in large units is possible, the workability is improved and the number of assembly steps at the site can be reduced. Therefore, according to the method of constructing a steel plate silo according to the present invention, it is possible to reliably ensure welding accuracy, which is an important factor in obtaining high airtightness, which is one of the important functions of a silo, and It becomes possible to realize a method for constructing iron plate silos that has excellent workability, a short construction process, and low transportation costs.

In addition, at the lower end of the unit to be assembled, a hakama part is formed which gradually increases in diameter as it goes downward and has a circumferential diameter that is approximately the same as the diameter of the unit located directly below when the unit is assembled. A unit with a smaller diameter can be easily positioned and assembled on the largest unit in almost no time and without any steps, and since there are no gaps or steps, welding between units is easy and safe. be able to.

In addition, since the above-mentioned silo is formed at the bottom end of the cylindrical assembly unit, the height and installation area of the silo, which requires a certain storage capacity, can be reduced, making construction work easier. The time required for this can be minimized.

[Brief explanation of drawings]

Figures 1 to 6 are diagrams for explaining a method of constructing an iron plate silo which is an embodiment of the present invention.
Figure 1 is a front view showing the assembled iron plate silo, Figure 2 is a front view showing the iron plate silo during transportation and loading/unloading, Figure 3 is a front view showing the iron plate silo being unloaded, and Figure 4 is a front view showing the iron plate silo being unloaded. Figure 5 is a front view showing the iron plate silo unit being turned upside down, Figure 5 is a front view showing the iron plate silo being constructed, Figure 6 is a plan view showing the shape retaining jig, and Figure 7 is a conventional iron plate silo. It is a front view. 1... Steel plate silo, 2... Support structure, 4a,
4b, 4c...Silo unit (unit), 1
0...lifting machine, 11...transport ship.

Claims (1)

[Claims] 1. A process of dividing and manufacturing a cylindrical steel silo with a changed inner diameter into a plurality of cylindrical units, and a process of manufacturing these plurality of units with the remaining units housed in the unit with the largest inner diameter. and a step of assembling the transported plurality of units to install the silo, and the plurality of units are assembled on the largest unit having the largest inner diameter. At the lower end of the assembling unit, the diameter of the periphery gradually increases as it goes downward, and when the unit is assembled, the diameter of the unit located directly below is the diameter of the unit. A method for constructing an iron plate silo, characterized in that a hakama portion is formed with approximately the same diameter as the iron plate silo.