JPS6020166B2 - Molding method of concrete products - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION When centrifugally forming concrete secondary products such as piles, poles, and fume pipes using flexible endless support members, the present invention provides a method for centrifugally forming concrete secondary products, such as piles, poles, and fume pipes, into a forming machine of a formwork whose inside is filled with concrete. It is possible to transfer molds into a mold with an even wall thickness in a tapered outer mold, to discharge water, sludge, etc. inside the mold after centrifugal force forming, and to transfer the mold to the outside of the molding machine. The present invention relates to a method using a tension mechanism that changes the tension of an endless support member.

The conventional method of forming concrete products such as piles, balls, and humid pipes using centrifugal force uses a formwork 2 with a number of casters 1 attached at appropriate intervals around its outer periphery, as shown in Figure 1. A molding machine 4 was used, in which both sides of the lower part of the casting 1 of the frame 2 were supported by metal ramp foils 3, and the mold 2 was rotated by frictional conduction between the casting 1 and the runner foil 3.

The steps in the conventional molding method are shown in FIGS. 2 to 6.

First, as shown in FIG.
Then, as shown in FIG. 2 is received by a receiving cylinder, this cylinder 7 is contracted, and the mold 2 is set in the molding machine 4.

Thereafter, the runner wheel 3 of the molding machine 4 is driven to give rotation to the formwork 2 as shown in FIG. 4, and the concrete that has been placed in the formwork 2 in advance is centrifugally formed.

When the molding is completed, the mold transfer cylinder 8 is raised and laid down as shown in FIG. One end side of the formwork 2 is raised with a tilting cylinder 10, the formwork 2 is tilted, water and sludge inside are discharged, and then the formwork 2 is transported to a curing tank using a crane or the like. be.

By the way, in the conventional molding method, when the mold is transferred into the molding machine, it must be received by the receiving cylinder 7, this cylinder must be contracted, and then set on the molding machine 4. When forming the frame, the formwork does not have any degree of freedom, so the concrete is formed with unevenness, making it impossible to obtain a product with a more uniform thickness of the same degree. When discharging the water and sludge inside the frame, it is necessary to operate a separate pocket sill 10 to raise one side of the formwork and discharge the water and sludge inside, which makes the operation and manufacturing process difficult. There were problems such as the process becoming chaotic.

This invention was made in order to solve the above-mentioned problems with the secondary molding, and it is possible not only to obtain molding with a large centrifugal force due to the high speed rotation of the mold, but also to reduce the The purpose of this is to extremely efficiently transfer and discharge water and discharge water and sludge from the mold frame after molding a uniform-thickness product in molding with a tapered outer shape, and after molding.

Embodiments of the present invention will be described below with reference to FIGS. 7 to 14 of the accompanying drawings.
This will be explained based on the diagram.

As a first example of the present invention, a molding machine 11 has two grooved pulleys 12 and 13 and an anchor pulley 14 arranged side by side as shown in FIG. Elastic endless belt 1
5 was used.

This endless belt 15 is suspended from an outer pulley 12 to a tension pulley 14, and an intermediate pulley 13 supports an intermediate portion of the upper running portion of the belt 15.

The outer pulley 12 moves with the motor 16 to make the endless belt 15 run, and the tension pulley 14 can freely move forward and backward relative to the intermediate pulley 13, and is given forward and backward movement by interlocking with the cylinder 17, so that the endless belt 15 The intensity can be freely changed.

The molding machine 11 has a pulley 12 of an endless belt 15.
The formwork 21 is supported by the hanging part running between and 13,
As the belt 15 runs, rotation is applied to the formwork 21 by friction transmission.

The endless belt 15 in this molding machine 11 is made of rubber or a similarly effective elastic material, and has a large friction coefficient, so it can transmit rotation to the formwork 21 without slipping, and can also control the position of the tension pulley 14. By adjusting, the contact surface distance A and B between the formwork 21 and the endless belt 15 can be changed, and the rotational transmission force can be arbitrarily set. In the illustrated embodiment, an elastic endless belt is used as the support member, but a chain, wire, or string-like body may also be used in addition to the belt.

FIG. 8 shows a preferred example of a formwork used for this development, and is applied to a formwork for pile forming.

This formwork 21 has semicircular upper and lower frames 22 and 23 joined together with bolts at the insertion parts 24 on both sides, and has reinforcing ribs 25 and reinforcing bands 26 on the outer circumferential surface, and a friction transmission road surface at appropriate intervals in the opposite direction. 27. FIG. 9 shows a different example of the tension mechanism for the endless belt 15, in which the end of the endless belt 15 is supported by a fixed pulley 31, and a swing arm 32 is placed close to the fixed pulley 31'. A presser pulley 33 that contacts the endless belt 15 is pivotally installed at the tip of the swinging arm 32, and a cylinder 34 is connected to the rear end of the swinging arm 32.
4, the belt 15 is pressed by the presser pulley 33.

Next, steps in the molding method of the present invention will be explained based on FIGS. 10 to 14.

As shown in FIG. 10, the molding machine 11 moves the tension pulley 14 outward to keep the endless belt 15 under tension, and moves the formwork 21, which has been carried on a trolley 35, through the bridge 36. Transfer and discharge onto the molding machine 11.

When the molding machine 11 receives the mold 21, it moves the tension pulley 14 inward as shown in FIG.
1, and in this state, start the motor 16 to rotate the belt 1.
5 is run, the formwork 21 is rotated as shown in FIG. 12, and the concrete inside is formed by centrifugal force.

During molding, the formwork 21 is suspended by the endless belt 15, so there is a degree of freedom between the formwork 21 and the concrete inside, and there is a weight imbalance due to the concrete not being perfectly circular yet. However, the center of rotation, that is, the position where the moment of inertia is the smallest, is automatically determined, and therefore a product with high cylindricity and precision can be molded.

When the molding is completed, the tension pulley 14 in each molding machine 11 is moved to change the tension of the endless belt 15, and as shown in FIG. Drain internal water and sludge.

After that, the tension pulleys 14 of each molding machine 11 are moved outward to tension the endless belt 15, and the formwork 21 is
When it is raised to the upper part between the pulleys 12 and 13, the cylinder 37 for transfer is moved upward to push the formwork 21, and the formwork 21 is transferred onto the standby table 38, as shown in FIG. .

In addition, when manufacturing concrete poles, since the external shape is tapered, there is a problem in the conventional forming method that the thickness of the concrete becomes thicker as it becomes the base, but according to the method of the present invention, as shown in Figure 13. Each molding machine like 1
By changing the tension of the belt 15 of 1 and tilting the formwork 21, it is possible to move the concrete inside in all directions along the axis of the formwork 21, so it is possible to manufacture a pole with a uniform wall thickness over the entire length. can.

As described above, the present invention has the above-described configuration, and since a tension mechanism is used in the endless support section, the tension of the endless support member can be freely changed.
Since the lower half of the formwork is supported by the slack part between the pulleys 12 and 13 arranged in parallel, the formwork can be easily supported and rotated, and power costs can be reduced and high-speed rotation is possible.

In addition, by changing the tension, the molding machine itself can be used as a receiving device, a discharging device, and a mirroring device, which is extremely convenient and has the effect of making it possible to automate the production of concrete products.

[BRIEF DESCRIPTION OF THE DRAWINGS] Fig. 1 is a longitudinal sectional front view showing a conventional molding method, Figs. 8 is a plan view of the mold used in the above, FIG. 9 is a front view of a molding method showing another example of the tension device, and each of FIGS. 10 to 14 is,
It is a process diagram of this invention. 11... Molding machine, 12, 13... Pulley, 14
, 32... tension mechanism, 15...
Endless support member. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Figure 10 Figure 11 Figure 12 Figure 13 Figure 14

Claims (1)

[Claims] 1 Rotate the formwork filled with concrete,
In a method of centrifugally forming concrete in a formwork, an endless belt with a tension adjustment device is hung around pulleys arranged horizontally at appropriate intervals, and the belt between the pulleys arranged in parallel forms the formwork. A method for forming a concrete product characterized by supporting.