JPH01182471A - Hopper for silo - Google Patents

Abstract

PURPOSE:To promote the saving or the like of the cost of construction eliminating the necessity for a general step or the like by providing two or more half PC prints to be arranged through a joint on a bottom surface of a hopper forming a tilt surface while introducing prestress to the half PC print. CONSTITUTION:A support, receiving upper and bottom end parts of a half PC print 2, is constructed in a bottom surface side of a hopper 1, thereafter the print 2 is arranged being separated so as to enable a joint to be formed between the two or more prints 2. While on an upper part of the print 2, ribs 4, 4... are arranged along a tilt surface. The hopper 1 constructs its structure by driving concrete C to be deposited in a mold frame with the print 2 serving as the bottom side mold frame and with a stainless steel plate 5 in an upper surface serving as the upper part mold frame, and the concrete is absorbed in its contraction by the joint. Accordingly, preventing the generation of a crack and eliminating the necessity for the bottom part frame, the cost of construction can be reduced.

Description

Detailed Description of the Invention "Field of Industrial Application" The present invention relates to a structure of a part of a hopper of a large silo such as a coal silo, and relates to a hopper of a silo in which a half PC plate is provided on the bottom side of the hopper. It is.

``Prior art'' Conventionally, for the hopper of this type of silo, after constructing a complete scaffold in accordance with the slope to be constructed, a formwork is placed along the slope of the hopper, and then a formwork is placed inside the hopper. It is known that the structure is constructed by arranging reinforcing bars and pouring concrete inside the building on site.

``Problem to be Solved by the Invention'' However, since the hopper of the conventional silo is constructed of cast-in-place reinforced concrete, it is prone to cracking, and if cracks occur, the stored contents may leak out from there. Repair work is required due to leakage or conversely rainwater entering the interior, and since the hopper is located at a high location, full scaffolding is required during construction, and the hopper is located at a high location. The formwork had to be constructed to fit the slope of the building, which caused problems such as delaying the construction period and increasing construction costs.

The present invention has been made in view of the above-mentioned problems, and can prevent cracks from occurring in the hopper, can generate cracks at preset positions, and can further improve overall scaffolding and lower The object of the present invention is to provide a silo hopper that does not require formwork, improves workability and safety, and reduces construction costs.

"Means for Solving the Problems" The present invention provides a plurality of half PC plates that are arranged on the lower side of a hopper provided at the bottom of a silo and formed with an inclined surface so that joints are formed between them. The above problem is solved by introducing prestress into these half PCs.

``Function'' In the present invention, since the half-PC plate is provided on the bottom side of the hopper, it can be used as a formwork when pouring concrete, eliminating the need for formwork, and also It can be used as In addition, since joints are provided between the half PC plates, when the concrete that has been placed shrinks, it can absorb the deformation and prevent cracks from forming in a part of the hopper. It is possible to generate cracks in a planned area.

"Example" Hereinafter, the present invention will be explained with reference to the drawings.

1 to 3 show one embodiment of the present invention, FIG. 1 shows a side cross section of a part of the hopper of a silo, and FIG. 2 shows an upward view of the hopper in FIG. 1 from the bottom side. FIG. 3 is a perspective view of a cross section of the hopper.

Reference numeral l in the figure is a hopper of a silo for storing coal and the like. The hopper 1 is formed with inclined surfaces 1a and 1b, and the inclined surface 1a on the bottom side has a half plate of a predetermined shape divided into a plurality of sheets in the horizontal direction so as to cover the entire slope.
C version 2.2. ... is arranged, each half PC version 2.2
．． Joints 3°3, . . . are formed at the joints. Each of the above-mentioned half PC plates is designed to also serve as the lower formwork of the hopper L, and reinforcing bars to serve as the lower end reinforcements are arranged in advance inside the plate, and prestress is introduced using 20W4 bars. ing. On the upper surface of the half PC plate, ribs 4, 4. ... are arranged at regular intervals along the slope. And half PC
At the top of the plate is concrete C, which will become the frame of hopper L.
has been poured, and the slope 1 on the top side of concrete C
b is covered with a stainless steel plate 5 which also serves as an upper formwork.

Next, the function of the silo hopper configured as described above will be explained together with its construction method.

In order to construct the hopper 1 of the silo, first, as shown in Fig. 1, a support (not shown) is placed on the bottom side of the hopper 1 to receive the upper end near the 0 point and the lower end near the 0 point of the half PC plate. After building each half PC version 2.2. ... forms a predetermined inclined surface 1a,
The upper and lower ends are supported and spaced apart by a predetermined distance in the horizontal direction so that a joint of 3.3° is formed between them. Each half PC version 2.2.・
... has lower end reinforcement placed inside in advance, and
Prestress is introduced using the PC steel rod. And each joint 3.3. ... is after pouring concrete C as the frame of hopper L.
They are strategically provided in advance in locations where cracks are likely to occur when the joints harden and contract, and each joint 3 formed is caulked 3 degrees.

Further, on the upper part of the half PC plate 2 arranged above, ribs 4.4. By arranging..., the strength of the hopper 1 is increased and it is used as a staircase during construction.

Next, the half PC version 2.2 arranged as described above.
... is used as the lower formwork, and the upper stainless steel plate 5
After arranging the hopper 1 to serve as the upper formwork, concrete C is placed inside the formwork to construct the frame of the hopper 1. In this way, construction of one part of the hopper is completed.

In this way, in the silo hopper of this example,
PC version 2.2.
... is provided, so it can be used as a formwork when pouring concrete C, eliminating the need for a formwork, and can also be used as a work floor during construction. In addition, since joints 3 are provided between each half and the PC plate 2, it is possible to absorb the shrinkage when the concrete C hardens, and prevent cracks from occurring in the hopper 1 part. Since cracks can be generated in preset portions, damage caused by cracks can be minimized.

The hopper of the silo shown in the above embodiment is not particularly limited to the cross-sectional shape described above, but any cross-sectional shape of the hopper may be used as long as it forms an inclined surface. It can also be applied to

"Effects of the Invention" As explained in detail above, in the silo hopper of the present invention, a plurality of half PC plates are arranged with joints provided on the bottom side of the hopper, so that shrinkage of concrete can be prevented. It is possible to prevent cracks from occurring in a portion of the hopper, and also to cause cracks to occur in a predetermined portion. In addition, the half PC plate can be used as a formwork when pouring concrete, eliminating the need for a lower formwork, and can also be used as a work floor, reducing construction costs. It is possible to improve workability. In addition, since the half PC plate has high plate rigidity, it is possible to omit the intermediate support when using it as a formwork.
Very economical. Furthermore, since prestress is introduced into the half PC plate, it is possible to prevent cracks, and even if cracks occur, it is possible to prevent the cracks from growing and creating gaps.

[Brief explanation of the drawing]

Figures 1 to 3 show one embodiment of the present invention. Figure 1 is a side sectional view of a silo hopper, and Figure 2 is a bottom side of the hopper (the side where the PC plate is installed). ), and FIG. 3 is a cross-sectional perspective view of the hopper. ! ... Hopper, 2 ... Half PC version, 3 ... Joint, 4 ... Rib, C ...
···concrete.

Claims (1)

[Claims] A plurality of half-PC plates are arranged on the bottom side of the hopper, which is provided at the bottom of the silo and has an inclined surface, so that joints are formed between them, and prestress is introduced into these half-PC plates. A silo hopper that features: