JPS6327678A - Construction of iron plate silo - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention "Industrial Application Field" This invention is applicable to 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. Concerning construction methods.

``Conventional technology'' Traditionally, silos for storing grains, mineral resources, etc. and livestock feed for long periods of time have been divided into reinforced concrete silos, iron plate silos, etc., depending on the type of materials that make up the outer shell. It is broadly classified. 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. 8 is a diagram showing an example of a conventional iron plate silo or an iron plate silo that is an inner wall of an iron plate concrete silo.

In Figure 8, the symbol! is 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 l is formed into a cylindrical shape with an inner diameter that is substantially the same throughout, and a hopper 3 is attached to the lower end thereof.

To construct the iron plate silo 1 as described above, a cylindrical body is created by dividing the iron plate silo 1 into circular slices at a factory.
These cylindrical bodies are carried to the vicinity of the support structure 2, and they are stacked one by one by welding from the bottom upwards one by one. After the entire body is assembled, an airtightness test is conducted to search for defective points. However, if there is a defect, the general method is to repair it and complete the iron plate size (71).

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 cylinders, it is difficult to save transportation space by stacking the cylinders, etc. The disadvantage was that it was difficult. In particular, since the cost of transportation is determined by the capacity of the transported object rather than its weight, the M4
The construction method inevitably resulted in increased transportation costs. 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 is used to store agricultural products such as grains, salt, sugar, fertilizer, cement, mineral resources, chips, lime, coal, and even livestock. The silo is designed to store 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 is designed with durability. In addition to maintaining weather resistance, buckling strength, and earthquake and fire resistance, there are strict requirements for properties such as moisture resistance to prevent condensation, airtightness to provide epidemic protection, and heat insulation to prevent the progression of rot. In particular, imported grains, etc. undergo prescribed inspections under the Plant Protection Act, and disinfection measures are taken if there is a problem with epidemic prevention, but normally, chemicals such as methyl bromide are gasified and sealed in Silo 1. 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 by welding them one by one on site, welding is an on-site work. In addition, it is affected by environmental factors such as weather and equipment, and the workability is not good.
There are problems in that it is not possible to ensure welding precision, which is largely responsible for guaranteeing the airtightness of the silo L, or that securing it requires construction time, equipment, etc., resulting in extremely high costs. For this reason, even at the expense of rising transportation costs, it is necessary to transport the iron plate silo l in a relatively large unit like the cylindrical body and ensure airtightness after assembly. There were times when I didn't get it.

This invention can reliably ensure welding accuracy, which is an important factor in achieving high airtightness, which is an important function for silos, and has excellent workability, shortens the construction process, and reduces transportation costs. The problem is how to construct an inexpensive steel plate silo.

"Means for Solving the Problems" This invention provides a method for constructing a steel plate silo by dividing a cylindrical steel silo with a changed inner diameter into a plurality of cylindrical units.
a step of transporting the plurality of units with the remaining units stored in the unit having the largest inner diameter; and a step of installing the silo by assembling the plurality of transported units. The above problem is solved by configuring the following.

"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 manufactured, and the remaining units are stored in the unit with the largest inner diameter and transported, so the transport space occupied by each unit is large. 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 previously installed on a quay or the like, similar to the conventional iron plate silo. The inner diameter of this iron plate silo l is changed in three stages, and the inner diameter becomes narrower as it goes upward. It is formed like this. That is, in the illustrated example, D + > D * >
Ds.

Furthermore, beams 5.5, . There is.

This iron plate silo l, like the conventional iron plate silo,
Once assembled at the factory, the silo is divided into three sections at the step where the inner diameter changes (points a and b in Figure 1).
The silo units are respectively cylindrical silo units 4a, 4b, and 4c. Alternatively, it is of course possible to directly manufacture the silo units 4a, . . . without assembling them and transport them.

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 maximum inner diameter is The remaining silo units 4b and 4c are stored upside down in the silo unit 4a, and a buffer I/18.8 made of styrene or the like is placed in the gap between them.
,... is filled. Then, these integrated silo units 4a, 4b, and 4c are loaded onto the transport ship 11 using the lifting device 9 and the lifting machine IO, and the base 6.6 of the silo unit 4a is fixed on the transport ship 11. It is fixed to the frame 12. Here, the means of transportation of the silo units 4a, . . . is not limited to the transport ship ll, but the silo units 4a, . Considering that many of the large steel mills that produce steel are also located along the coast or along canals, it can be said that transportation by sea means such as the transport ship 11 is optimal.

After the transport ship 11 transports the silo units 4a, . . . to the quay 13 near the silo l construction site, the silo units 4a, .
and a lifting machine 10, the integrated silo unit 4
a, 4b, and 4c are lowered from the transport ship 11 to the quay 13. Here, the silo unit 4 on the quay 13
The frames for a, . . . may be prepared in advance, or the fixed frames 12 used during transportation by the transport ship 11 may be reused.

Then, the silo unit 4a... after unloading,
The silo units 4a,... are assembled on the support structure 2 installed in advance at the silo l construction site, and the silo l is constructed.
However, due to the state during transportation, silo units 4b and 4c are upside down and stored inside silo unit 4a, so they cannot be assembled into the specified shape in their current 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. To do this, first attach the tip of the hanging fixture 14 to the top slab pouring beam 5.5 or the temporary beam 7.7.
Then, with the shape retaining jig 15 inserted into the upper end opening of the silo units 4b and 4c, these silo units 4"bs 4c are lifted up into the silo unit 4a by the lifting tool 14 and the lifting force l110. 1. The shape holding jig 15 is the silo unit 4b, 4c.
In order to prevent the upper end opening from deforming, spokes 15c are inserted into the upper end opening, and as shown in FIG. 6, spokes 15c,
15c1... are stretched, and turnbuckles 15d, 15d,... for roundness adjustment are interposed between these spokes 15c, 15c,.... Further, the reversing machine 16 is configured to include the silo unit 'b.
s 4c, and as shown in Fig. 4, it includes a support ring 16a into which these silo units 4b and 4c are loosely inserted, and a base 16b which rotatably supports this support ring 16a. It consists of

Then, by this reversing machine 16, the silo unit 4b14
At the same time as turning the top and bottom of c, the remaining silo unit 4a
is transported onto the support structure 2 installed at the predetermined position by the lifting device 14 and the lifting machine 10 with the shape retaining jig 15 inserted into the upper end opening of the unit, and then the unit is The silo unit 4a is installed on the support structure 2 by fixing the base 6.6 and the support structure 2 with anchor bolts or the like. Then, the silo units 4b and 4c are sequentially placed on the silo unit 4a.
The entire silo 1 is assembled by placing the silo on the supporting structure 2 and welding the outer peripheral surface on-site, thereby constructing a steel 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 poured around the iron plate silo l, thereby forming a steel plate concrete silo.

The iron plate silo l is constructed by the method described above.

Here, since most of the welding work when manufacturing and assembling the iron plate silo l is performed in a well-equipped factory,
In addition to being extremely easy to work with, there is no need to worry about controlling the weather, especially the environmental temperature and humidity, which greatly affect welding accuracy, and therefore affect airtightness, which is an important function of a silo. It becomes possible to ensure welding accuracy.

Further, the iron plate silo I is divided into three silo units 4a14b and 4c when transported by a transport ship 11, etc., and the remaining silo units 4b and 4c are stored in the silo unit 4a having the largest inner diameter for transport. Therefore, compared to the conventional case of transporting cylindrical bodies of the same diameter, the transport space occupied by the unit can be reduced, thereby contributing to a reduction in transport costs. And since it becomes possible to transport large units,
Coupled with the improvement in workability, on-site assembly man-hours 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 an important function for silos, and also to ensure excellent workability and to improve construction process. This makes it possible to realize a method of constructing iron plate silos that is short in length and has low transportation costs.

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 I is not limited to a cylindrical shape, but may be a rectangular tube shape. Further, the method of transporting and hoisting the silo units 4a, . . . is not limited to the method of the embodiment described above, and may be appropriately selected from among the methods. Also,
The cutting points of iron plate silo l are also a and b in Fig. 1.
It is not limited to the location, but it may be manufactured by cutting and dividing into a size suitable for transportation in conjunction with the number of locations where the inner diameter changes in the iron plate silo l.

Furthermore, according to the method of constructing an iron plate silo according to the present invention, as shown in FIG. In order to insert the iron plate silo la with a small inner diameter into the entire large iron plate silo l, in the illustrated example, D4<D,),
This saves transportation space and allows iron plate silos 1a and 1
A method of transporting b can also be considered. - "Effects of the Invention" As explained in detail above, according to the present invention, the process of dividing and manufacturing a cylindrical steel silo with a changed inner diameter into a plurality of cylindrical units, and A 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 having a silo, 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 silo can be done in a well-equipped factory, which is extremely easy to work with, and weather conditions, especially those that greatly affect welding accuracy, can be done in a well-equipped factory. There is no need to worry about controlling environmental 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 into multiple units during transportation, and the remaining units are stored in the unit with the largest inner diameter for transportation.
Compared to the conventional case of transporting cylinders of the same diameter, the transport space occupied by the unit can be reduced,
Therefore, it is possible to contribute to reducing transportation costs.

Furthermore, since it becomes possible to transport large units, it is possible to reduce the number of assembly steps at the site, coupled with the improvement in workability. Therefore, according to the method of constructing a steel plate silo of this invention, it is possible to ensure welding accuracy, which is an important factor in obtaining high airtightness, which is one of the important functions of a silo, and to improve workability. It becomes possible to realize a method of constructing iron plate silos that is excellent, has a short construction process, and has low transportation costs.

[Brief explanation of the drawing]

1 to 6 are diagrams explaining a method of constructing an iron plate silo, which is an embodiment of the present invention, in which FIG. 1 is a front view showing the assembled iron plate silo, and FIG. A front view showing the state of silo transport and loading/unloading, Figure 3 is a front view showing the state of unloading the iron plate silo, Figure 4 is a front view showing the iron plate silo unit upside down work, and Figure 5 is a front view showing the iron plate silo construction. FIG. 6 is a plan view showing the shape retaining jig, and FIG. 7 is a diagram showing a method of constructing an iron plate silo according to a modified embodiment of the present invention, showing the installed state. A front view showing the iron plate silo and the state of the iron plate silo during transportation, and FIG. 8 is a front view showing a conventional iron plate silo. I... Iron plate silo, 2... Support structure, 4a14b14c... Silo unit (unit), 10... Lifting machine, 1!・・・・・・
transport ship.

Claims (1)

[Claims] The process of dividing and manufacturing a cylindrical steel silo with a different inner diameter into multiple cylindrical units, and transporting these multiple units with the remaining units stored in the unit with the largest inner diameter. A method for constructing an iron plate silo, comprising a step of assembling a plurality of transported units to install the silo.