JPH0227121B2 - - Google Patents

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention manufactures a bottomed cylindrical body using a vibratory pressure forming machine that compacts extremely hard concrete material with a small water/cement ratio by applying vibrations. It's about how to do it.

(Prior art) At present, a tapered medium mold with a slightly small diameter at the upper end is established on a base plate, and a tapered outer mold with a slightly small diameter at the top end, similar to the medium mold, is placed on the outside of this medium mold. Either the outer mold is fitted in a removable manner, or the outer mold is fixed to a frame, and the middle mold is fitted into the outer mold in a removable manner. A vibratory pressure forming machine is used to knead the hardened concrete material placed between the outside mold and pressurize the top surface of the vibrating concrete material using a pressure plate.

(Problems to be Solved by the Invention) However, it has been impossible to mold a bottomed cylindrical body using the vibratory pressure molding machine described above. That is, even if it is attempted to form the bottom plate part together with the cylindrical part by filling the upper surface of the medium size of this vibratory pressure molding machine with concrete material,
This is because the top surface of the medium mold and the bottom plate are in close contact with each other and do not allow air to enter between them, so that when the medium mold is demolded, the bottom plate may be deformed, cracking, or collapsing.

The present invention aims to provide a manufacturing method capable of producing a bottomed cylindrical body using such a conventional vibratory pressure molding machine.

(Means for Solving the Problems) In order to solve the above problems, the present invention has a cylindrical molding space formed between the middle mold and the outer mold, and a support plate stacked on the middle mold and the outer mold. The concrete material is put into the bottom plate forming space formed by the upper part and subjected to vibration compaction, and after the vibrating concrete material is pressurized from above, the supporting plate is inserted into the bottom plate forming space. The objective is to easily produce a concrete cylinder with a bottom by demolding the middle mold and the outer mold while keeping them in close contact with each other, removing the support plate, and curing the concrete cylinder.

(Function) In other words, the method for producing a concrete cylinder with a bottom according to the present invention is such that the support plate stacked on the middle mold in a vibratory pressure forming machine is brought into close contact with the lower surface of the concrete material in the bottom plate forming space. When removing the mold, if the diameter of the concrete cylinder with a bottom to be molded is small, a supporting plate stacked on top of the medium mold will be tightly adhered by the adhesive force of the cement paste.On the other hand, if the diameter of the cylinder is large, The support plate is also heavy, so by connecting it to the support frame on the concrete material, it will be tightly attached to the bottom surface of the concrete material, and when removing the tapered medium mold with a slightly smaller diameter at the upper end in this state, it will be necessary to remove it. When the mold is started, there is a reduced pressure between the top surface of the middle mold and the support plate, but since air instantly flows into this space, the concrete material is supported by the support plate and removed from the mold without being damaged.

(Example) Next, an example of the present invention will be described based on the drawings. Reference numeral 1 is a medium-sized device whose lower end is fixed on a base plate 2, and a vibrator 3 is provided inside. 4 is medium size 1
It is an outer mold inserted from above to the outside of the outer mold 4.
A ring-shaped pallet 5 is detachably attached to the lower end of the pallet. The inner periphery of this pallet 5 is slidably fitted to the medium-sized outer wall. 6 is medium size 1
It is a support plate stacked on the upper end of the support plate, and a spiral cylinder 7 is provided protruding from the center of the support plate. 8 is a concrete feeder 9 that is fed into a cylindrical molding space a formed between the middle mold 1 and the outer mold 4, and a bottom plate molding space b formed by the support plate 6 and the upper part of the outer mold 4. It is a mixed concrete material. 10 is a pressurizing device arranged movably on the bottom plate forming space b;
a and a pressure plate 10b. Further, 11 is a concrete molded body, and a cylindrical part 11a
and a bottom plate portion 11b. Reference numeral 12 designates a support frame stacked on the concrete molded body 11, through which a threaded rod 13 passes through the center thereof and rotatably supports the support frame; a handle 14 is provided at the upper end of the threaded rod 13; It is screwed into a screw tube 7 on the plate 6. 15 is a support frame for raising and lowering the outer mold 4, and 16 is a vibration transmission frame provided around the outer periphery of the middle mold 1.

Next, the operation of the above embodiment will be explained based on drawings A to F. As shown in drawing A, the support plate 6 is set on the middle mold 1 of the vibratory pressure molding machine, and the vibrator 3 is driven. After vibrating the outer mold 4 and feeding the hardened concrete material 8 from the concrete feeder 9 into the molding spaces a and b as shown in drawing B, a pressurizing device 10 is placed on the concrete material 8 as shown in drawing c. The pressure plates 10b are piled up and pressed by the pressure machine 10a to form the pressure plate, the vibrator 3 is stopped and the pressure device 10 is evacuated, and a support frame is placed on the concrete molded body 11 as shown in drawing D. 12 is mounted, and the lower end of the threaded rod 13 is screwed into the screw tube 7 to connect the support plate 6 and the support frame 12.
As shown in the drawing E, a lifting support frame 15 is connected to the upper end of the outer mold 4, and the lifting support frame 15 is lifted together with the molded body 11 by a crane or the like, and the middle mold 1 is demolded, and this is placed in a curing place. Then, the pallet 5 and the outer mold 4 are disconnected, and the outer mold 4 is removed and cured as shown in the drawing. When the concrete has hardened to some extent, the threaded rod 13 is loosened, the support frame 12 and the support plate 6 are removed from the molded body 11, and the through hole formed in the bottom plate portion 11b of the molded body 11 by the screw tube 7 is filled with concrete material. After that, continue curing,
It is made into a product.

In the above embodiment, a molding machine was used in which the middle mold 1 was fixed on the bed plate 2 and the outer mold 4 was moved up and down. It goes without saying that a molding machine that moves up and down can be used.

(Effects of the Invention) The method for manufacturing a concrete cylinder with a bottom according to the present invention includes stacking a support plate on the middle mold in a vibratory pressure molding machine, and removing the mold while keeping this support plate in close contact with the molded product during demolding. This method prevents the molded body from collapsing during demolding, and has the effect of easily producing a strong concrete cylinder with a bottom.

[Brief explanation of drawings]

Drawings A, B, C, D, H, and F are explanatory diagrams showing the process order of the manufacturing method according to the present invention. 1; Medium size, 2; Base plate, 3; Vibrator, 4; Outer type,
5; Pallet, 6; Support plate, 7; Spiral, 8; Concrete material, 9; Concrete feeder, 1
0; Pressure device, 10a; Pressure machine, 10b; Pressure plate, 11; Concrete molded body, 11a; Cylindrical part, 11b; Bottom plate part, 12; Support frame, 13; Threaded rod, 14; Handle, 15; Lifting Support frame for 1
6; Vibration conduction frame.

Claims (1)

[Claims] 1 Vibration compaction is performed while concrete is being poured into the cylindrical molding space formed between the middle mold and the outer mold, and the bottom plate molding space formed by the support plate stacked on the middle mold and the upper part of the outer mold. After pressing the vibrating concrete material from above and forming it under pressure,
A method for producing a bottomed concrete cylinder, characterized by removing the middle mold and outer mold while keeping the support plate in close contact with the concrete material in the bottom plate forming space, and curing after removing the support plate.