JPH04231517A - Placing of base concrete for silo - Google Patents

Abstract

PURPOSE:To prevent the cracking of concrete by a method in which a base plate is fixed to anchor bolts set in a base concrete, a cushion part is set inside the case concrete, and the base concrete is placed. CONSTITUTION:A base concrete 1 is placed, and anchor bolts 2 are set in the concrete 1 in a ringed form. A ringed base plate 3 for silo is fixed horizontally on a given level to the bolts 2 by an adjuster nut 4 and a lock nut 5. A cushion part 11 is set on the inner surface of the plate 3 and base concrete 6 is placed on the base concrete 1 to place it on the same level as the base concrete 3.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for pouring concrete into a silo base.

0002

BACKGROUND OF THE INVENTION To construct a silo, a foundation concrete 1 is usually placed at the construction site as shown in FIG.
The ring-shaped base plate 3 of the silo is fixed horizontally at a certain height with adjuster nuts 4 and lock nuts 5, and then base concrete 6 is poured on the foundation concrete 1 so that it is at the same height as the base plate 3. The base plate 3 is supported on this base concrete 6, and then the silo outer plate 7 is placed on the base plate 3.
Assemble it to a point slightly above the position where hopper 8 is installed,
Next, the hopper 8, which has been assembled and manufactured in advance on the ground or in a factory, is lifted up by a crane (not shown) and lowered to a predetermined height within the silo outer panel 7, and its outer periphery is attached to the silo outer panel 7.
Next, the silo outer plate 7 was assembled to a predetermined height position, and the top end 9 was attached to the upper end of the silo outer plate 7.

By the way, in such a silo construction method, when the silo outer plate 7 is welded and assembled onto the base plate 3, the ring-shaped base plate 3 shrinks inward due to the welding heat, so the base concrete 6 As shown in FIG. 6, cracks 10 were generated on the entire surface layer of the sample, resulting in destruction.

For this reason, it is an exceptional practice to construct a silo on the base plate 3 before pouring the base concrete 6, but a silo weighing several tens of tons is placed on the base plate 3 attached to the anchor bolt 2. There is a risk of deformation or buckling of the anchor bolt 2, and if an earthquake or strong wind were to occur during construction, it would be extremely dangerous. In addition, pouring base concrete 6 inside the silo after constructing the silo is extremely inefficient, especially in the case of group tank silos, it is necessary to pour base concrete 6 into each silo.
Furthermore, it is difficult to make the base concrete 6 of each silo at a uniform level, especially if the anchor bolts 2 are deformed and the base plate 3 is distorted before the base concrete 6 is poured. base concrete 6 cannot be placed.

Therefore, normally the silo is not constructed before the base concrete 6 is poured, but the silo is constructed after the base concrete 6 is poured. It was unavoidable that cracks would occur in the surface layer of the base concrete 6 due to inward shrinkage of the base plate 3 during welding and assembly.

[0006]

[Problems to be Solved by the Invention] Therefore, the present invention seeks to provide a method for pouring silo base concrete that prevents cracks from forming in the surface layer of the base concrete when the silo outer plate is welded and assembled on the base plate. It is something.

[0007]

[Means for Solving the Problems] A method for placing base concrete for a silo according to the present invention to solve the above problems involves attaching a ring-shaped base plate to an anchor bolt implanted in the foundation concrete of a silo, and In pouring the base concrete on the foundation concrete at the same height, a cushioning material is provided on the inner peripheral side of the ring-shaped base plate, and then the base concrete is poured.

[0008]

[Operation] As described above, the base concrete is placed after placing the cushioning material on the inner circumferential side of the ring-shaped base plate, so the inner circumferential surface of the base plate does not come into contact with the surface layer of the base concrete, and the base plate Even if the base plate shrinks inward due to welding heat when the silo outer plate is welded and assembled on top, the cushioning material absorbs the shrinkage, preventing cracks from forming on the surface layer of the base concrete and completely preventing destruction. can do. Furthermore, even after the silo is constructed, the difference in expansion and contraction between the base plate and base concrete during winter and summer can be absorbed, so cracks do not occur in the surface layer of the base plate, and destruction can be prevented semi-permanently.

[0009]

[Example] To explain one embodiment of the method of pouring base concrete for a silo according to the present invention, as shown in FIG. A ring-shaped base plate 3 of the silo is horizontally fixed to the bolt 2 at a predetermined height position using an adjuster nut 4 and a lock nut 5. Then, as shown in FIG. 2, cushioning material 11 is arranged on the inner circumferential side of this ring-shaped base plate 3 with a uniform width all around, and then base concrete 6 is placed on the foundation concrete 1 so that it is at the same height as the base plate 3. The base plate 3 is supported on this base concrete 6 by pouring.

Since the base concrete 6 is cast after the cushioning material 11 is disposed on the inner circumferential side of the ring-shaped base plate 3 in this way, the inner circumferential surface of the base plate 3 and the surface layer of the base concrete 6 are not in contact with each other. do not. Therefore, in order to construct a silo on the base plate 3, first the silo outer plate 7 is erected on the base plate 3 as shown in FIG. Base ribs 12 are welded to the silo outer panel 7 and the base plate 3 as reinforcing agents on both sides of each anchor bolt 2, and base ribs 13 are attached as reinforcing agents on the outside of the silo outer panel 7 facing the anchor bolts 2. When welding to the silo outer plate 7 and the base plate 3, even if the base plate 3 shrinks inward due to those welds, the shrinkage will be absorbed by the cushioning material 11, and cracks will occur in the surface layer of the base concrete 6. Destruction can be completely prevented.

After the silo is constructed, the difference in expansion and contraction between the base plate 3 and the base concrete 6 during winter and summer can be absorbed by the cushioning material 11, so that the base concrete 6
No cracks occur in the surface layer, and destruction can be prevented semi-permanently.

In the above embodiment, the base concrete 6 is not placed on the outer circumference of the ring-shaped base plate 3. However, when concrete is poured, the draining bonding steel plate 14 is removed and the base concrete 6 is placed on the outer circumference of the base plate 3. As shown in FIG. 4, the base concrete 6 is placed on top of the cushion material 15
It is good to install.

[0013]

Effects of the Invention As described above, the method for placing base concrete for a silo of the present invention is to place cushioning material on the inner circumferential side of a ring-shaped base plate attached to an anchor bolt, and then place the cushion material on the foundation concrete at the same height as the base plate. Since the base concrete is cast in the base plate, even if the base plate shrinks inward due to welding heat when the silo outer plate is welded and assembled on the base plate, the cushioning material can absorb the shrinkage. It is also possible to absorb the difference in expansion and contraction between the base plate and base concrete during winter and summer after silo construction. Therefore, no cracks occur in the surface layer of the base concrete, and destruction can be completely prevented.

[0014] The above effects are not only applicable when placing base concrete for single tank silos, but also when placing base concrete for group tank silos.Especially in the case of group tank silos, stable and uniform level is achieved. It is effective in constructing base concrete.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a mounting structure of a ring-shaped base plate of a silo.

FIG. 2 is a diagram showing a state in which a cushioning material is arranged on the inner peripheral side of a ring-shaped base plate of a silo, and base concrete is poured.

FIG. 3 is a diagram illustrating another dog in which a silo outer plate is welded and assembled on a ring-shaped base plate in FIG. 2;

FIG. 4 is a diagram showing a state in which cushioning material is arranged on the inner and outer circumferential sides of a ring-shaped base plate of a silo, and base concrete is poured.

FIG. 5 is an explanatory diagram of a silo construction method.

FIG. 6 is a diagram showing a state in which cracks have occurred in the surface layer of the base concrete inside the ring-shaped base plate of the silo.

[Explanation of symbols]

1 Foundation concrete 2 Anchor bolt 3 Ring-shaped base plate 6 Base concrete 11 Cushion material

Claims (1)

[Claims] Claim 1: When attaching a ring-shaped base plate to an anchor bolt planted in the foundation concrete of a silo and pouring the base concrete on the foundation concrete at the same height as this base plate, After placing the cushioning material on the inner circumference,
A silo base concrete pouring method characterized by pouring base concrete.