JPS6013809B2 - Concrete pipe manufacturing method - Google Patents

Description

[Detailed Description of the Invention] The present invention is characterized in that a straight cylindrical outer frame provided with a branch mouth formwork on the side is supported on a machine frame, and an annular bottom frame and an annular lid frame are arranged in the upper and lower openings of the outer frame. Then, the chevron-shaped upper end of the straight cylindrical core is inserted into the entrance part of the annular bottom frame, and in this state, fresh concrete is poured into the outer frame from the opening of the annular lid frame, and while the concrete is vibrated, the straight cylindrical core is The side surface of the shaped core is brought into contact with the inner surface of the branch mouth formwork, and the core is slid upward, and the chevron-shaped upper end is raised to the outside of the closing part of the lid frame, and after the concrete has semi-hardened, the core is slid. This invention relates to a concrete pipe manufacturing method characterized by demolding.

To explain the embodiment of the present invention shown in the drawings, the machine frame 1
The lower end flange portion of a straight cylindrical outer frame 2 which can be divided into two with upper and lower ends open is fixed with bolts 3, and the upper end entrance portion is supported upward.
A formwork 11 for a branch port 13 is provided on the side surface of this outer frame 2, an annular bottom frame 5 is fixed to the lower end entrance part with the bolts 3, and an annular lid frame 6 is fixed to the upper end entrance flange with bolts 7. Fix it. And the chevron-shaped upper end portion 10 of the straight cylindrical core 8
is inserted into the closing part of the bottom frame 5 to close the closing part (the first
(see figure). A wire lobe 12 is connected to the chevron-shaped upper end 10, and the core 8 is pulled upward by the rope 12, but a hydraulic cylinder or a jack may be connected to the lower end of the core 8 instead of the rope 12. (not shown).
Note that 14 in the figure is a vibrator installed in the machine frame 1, and 15 is a reinforcing bar. In the present invention, as described above, in the state shown by the solid line in FIG. 1, a predetermined amount of fresh concrete 16 is poured into the outer frame 2 from the opening of the lid frame 6 at the upper end.

In this way, the concrete 16 is held at the lower part of the outer frame 2, the annular bottom frame 5, and the upper end of the chevron. In this state, when the outer frame 2, core 8, and branch mouth form 11 are vibrated by the vibrator 14, the concrete 16 is also vibrated and is sufficiently filled. Then, while moving the core 8 upward from the solid line position in Figure 1 to the position shown by the Gobo Sunsen with its side surface facing the inner surface of the crack skin opening formwork 11, pouring the ready-mixed concrete 16 into it. The concrete 16 is brought to the outside of the core 8 by the vibration and the action of the chevron-shaped upper end 10, and the cylindrical gap between the outer frame 2 and the core 8 is expanded from the bottom frame 5 to the lid frame 6 and the branch mouth form 11. Fill the inside thoroughly and gradually harden over time. After semi-hardening, the core 8 is slid downward from the imaginary line position in FIG. . The concrete pipe 17 thus obtained is shown in FIG. In the figure, 18 is a receiving □, and 19 is a receptacle. Conventionally, branch pipes with branch ports protruding from the main pipe were manufactured by spinning and molding by the action of centrifugal force without using a core like Hume pipes, which resulted in high equipment costs and difficulty in manufacturing easily, resulting in unbalanced centrifugal force. Not only was there great danger during the work, but the work was also complicated and economically disadvantageous.

There is also a method in which the inner wall of the concrete is compacted by making it hollow using a compression tube, and then pressurizing the inner wall of the concrete by pressure exchange. Because interviews were difficult, it was difficult to form concrete pipes with branch ports in one shot. The present invention has been made in view of the above-mentioned defects, and the present invention is based on the above-mentioned method.
This not only simplifies the production equipment for the protruding branch pipes, but also allows the concrete pipe 17 with the branch pipes (branch port 13) to be formed safely and easily.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the concrete pipe manufacturing method of the present invention, and FIG. 2 is a perspective view of the concrete pipe manufactured by the same method. 1... Machine frame, 2... Upper and lower engine mouth straight cylindrical outer frame, 5... Annular bottom frame, 6... Annular lid frame, 8... ... Straight cylindrical core, 10... Yamagata rising part,
11... Branch mouth formwork, 12... Wire rope,
16... Fresh concrete. Next figure

Claims (1)

[Scope of Claims] 1. A straight cylindrical outer frame 2 having a branch mouth formwork 11 on the side surface is supported on the machine frame 1, and an annular bottom frame 5 and an annular lid frame 6 are attached to the upper and lower openings of the outer frame 2. The chevron-shaped upper end 10 of the straight cylindrical core 8 is inserted into the opening of the annular bottom frame 5, and in this state, the ready-mixed concrete 16 is poured into the outer frame 2 from the opening of the annular lid frame 6.
is introduced, and while vibrating the concrete 16, the side surface of the straight cylindrical core 8 is brought into contact with the inner surface of the branch mouth form 11 and slid upward, and the chevron-shaped upper end 10 is placed in the opening of the lid frame 6. A concrete pipe manufacturing method characterized in that the concrete 16 is raised to the outside and after the concrete 16 is semi-hardened, the concrete core 8 is removed from the mold by sliding. 2. The concrete pipe manufacturing method according to claim 1, wherein the angular upper end 10 of the core 8 is pulled by a wire rope 12 and slid upward.