JPS6126225Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a cylindrical structure such as a silo.

For example, silos can be broadly classified into steel silos and concrete silos. Among these, steel silos are lightweight, and most of the manufacturing can be done in the workshop, so they can be manufactured in a short period of time, with high precision, even complex structures, and have excellent airtightness.
However, the temperature from the sun directly reaches the inside of the silo, leading to deterioration of the contents, buckling of the outer shell due to unexpected loads, and poor corrosion resistance.

On the other hand, concrete silos are heavy and most of the manufacturing is done on-site.
Construction takes a long time, and complex shapes are difficult.
It also lacks airtightness. However, concrete itself is an insulator and does not allow temperature changes to occur inside. It also has excellent corrosion resistance and safety.

Therefore, it has been found that for the outer shell structure of the silo, a steel shell with excellent airtightness and high precision workmanship should be used for the inner surface, and concrete, which has excellent corrosion resistance, heat insulation, and safety, should be used for the outer surface. Silos of this kind of thinking have been devised elsewhere. However, apart from the steel frame, the concrete must be cast on site, which requires considerable expense for scaffolding and formwork. Therefore, it would be possible to make a small part of the concrete shell into a brake cast shell, but since the silo is sufficiently large, there would be problems with joining it to the steel shell, and it would be difficult to transport the brake cast shell. Become. Another option is to spray concrete onto a steel shell, but this would require work at a very high place and the curing conditions for the concrete would be very poor.

The present invention proposes a cylindrical structure such as a silo that can solve the above-mentioned problems, and one embodiment thereof will be described below with reference to FIGS. 1 to 3.

FIG. 1 shows an external view of the silo 1, and FIG. 2 shows its longitudinal sectional view. The silo 1 has a truncated cone with a wide bottom at the top and a funnel shape with a discharge port 2 at the bottom. The inner cylinder shell 3 is made of steel, and the outermost shell 4 is made of thin glass fiber reinforced concrete. Filler concrete 5 is placed between the inner cylindrical shell 3 and the outermost shell 4, and the filling is done on site.
In addition, the outer surface of the inner cylinder shell 3 is filled with concrete 5.
A dowel 6 is welded to prevent slippage.
FIG. 3 shows a more detailed sectional view. i.e. 7
An H-shaped spacer connects the inner cylindrical shell 3 and the outermost shell 4, and is bonded to the inner cylindrical shell 3 by welding 8 and to the outermost shell 4 by adhesive 9. 10 is a reinforcing steel, and the filling concrete 5 is reinforced concrete. By making the outermost shell 4 made of glass fiber reinforced concrete, it can serve as a surface coating and a burial formwork.
It is possible to manufacture thick and thin shells. In FIG. 1, 11 indicates a leg body.

Next, a method of constructing the silo 1 will be explained based on FIG. 4. The inner cylinder shell 3 is manufactured at a factory and transported to the site. A dowel 6 is welded to the outer surface of the inner cylindrical shell 3. The outermost shell 4 is manufactured in a factory. Since each of the outermost shells 4 is a truncated cone, for example, the cart 12
They can be stacked and transported to avoid bulk. The weight of the outermost shell 4 is one with a diameter of 6 m and a thickness of 6 mm.
If the width is 1m and the unit weight is 2t/ ^m3 , one piece is approximately
It is 230Kg. The outermost shell is so light that even if the height of silo 1 is 20 m, the total transportation weight is only 5 tons. The outermost shells 4 that have arrived at the site are lifted one by one by a crane 13 and fitted into the inner cylindrical shell 3 from above. After fitting, the spacer 7 is attached, and the outermost shell 4 is integrated with the inner cylindrical shell 3. A reinforcing bar 10 is then installed between both 3 and 4. After making the lower joint line of the set outermost shell 4 sufficiently watertight with adhesive, for example, the concrete made from the ready-mixed concrete is transported by the concrete pump 14 and concrete pipe 15, and the inner and outermost shells 3 and the outermost shell 4 are connected to each other. It is filled between the outer shell 4 and the outer shell 4. This gap is approximately
Think 20cm to 5cm. Thereafter, the formwork valve platers attached to various locations on the inner surface of the inner cylindrical shell 3 are operated to compact it. Furthermore, if the filling concrete is made of steel fiber reinforced concrete, the number of reinforcing bars can be reduced and concrete pouring becomes easier.

Figure 5 shows another method of constructing silo 1. In this case, the inner cylindrical shell 3 is also divided into a plurality of parts, and the corresponding divided bodies are integrated with each other via a spacer 7. This integrated block is delivered to the site,
The blocks are piled up on site, the divided inner cylinder shell 3 is welded (backside welding), and concrete is poured. 16 shows a seal at the time of pouring.

As described above, according to the cylindrical structure such as a silo of the present invention, the inner cylindrical shell made of steel, the outermost shell made of glass fiber reinforced concrete, and the space between the inner cylindrical shell and the outermost shell. The following effects can be expected because the concrete is made of concrete.

Γ Airtightness, heat insulation, moisture resistance, weather resistance, buckling resistance,
Excellent earthquake resistance.

Γ The outermost shell made of glass fiber-reinforced concrete can be buried and used as a mold-killing formwork, and special formwork or strong scaffolding is not required.

Γ The outermost shell made of glass fiber reinforced concrete is extremely lightweight, making site construction easier.

Γ Due to the presence of the outermost shell, it is possible to suppress and control the occurrence of cracks on the surface of the filled concrete.

Γ Since the outermost shell is shaped like a truncated cone and the thickness of the filled concrete at the top is small, the cylindrical structure can be made lighter or taller.

Γ Because the outermost shell can be made with a beautiful surface,
A beautiful appearance can be achieved without special surface treatment or makeup. In particular, the commercial value will increase if colored cement is used for the outermost shell or relief is applied to the surface.

Γ Since the outermost shell has no joints in the circumferential direction, it can sufficiently absorb the lateral pressure of concrete during pouring.

Γ Curing conditions are better than shotcrete.

Γ Since the outermost shell is divided in the direction of the cylinder axis,
Concrete pouring can be carried out by setting this outermost shell on site, and the spacer allows the filling concrete to be placed while maintaining the appropriate distance between the inner cylinder shell and the outermost shell, and the dowel allows the filling concrete to be placed. It can prevent misalignment and separation.

[Brief explanation of the drawing]

Figures 1 to 3 show an embodiment of the present invention, with Figure 1 being an external view, Figure 2 being a vertical front view, Figure 3 being a perspective view of the main parts, and Figures 4 and 5 being It is an explanatory view showing a construction state, respectively. 1... Silo, 3... Inner cylinder shell, 4... Outermost shell,
5... Filled concrete, 6... Jibel, 7...
...Spacer, 10...Reinforcing bar.

Claims (1)

[Scope of utility model registration request] An inner cylindrical shell made of steel with a dowel for preventing concrete slipping protruding from the outer peripheral surface, a truncated conical outermost shell made of glass fiber-reinforced concrete surrounding the inner cylindrical shell, and the inner cylindrical shell. A cylindrical structure, such as a silo, characterized by comprising a spacer connecting the inner cylindrical shell and the outermost shell, and filled concrete placed between the inner cylindrical shell and the outermost shell.