JPS6328605A - Manufacture of pc board - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a method for manufacturing a PC (precast concrete) slope.

``Conventional technologyj Generally, in construction work that uses a large amount of PC boards, the necessary PC
By manufacturing the boards at the construction site, it is possible to reduce the cost required for transporting the PC boards.

FIGS. 6 and 7 show a conventional example of a PC temporary manufacturing method at a construction site.

That is, this manufacturing method consists of the following steps.

SI: Install side formwork 2 on the soil of concrete head l provided in GL.

S2: Necessary reinforcing bars (path shown) are placed inside the side formwork 2.

S3. Concrete 3 is poured into the side formwork 2.

S40 Next, a recess (as shown in the figure) for joining called a cotter is formed on the surface of the concrete 3.

Note that the formation of this cotter is similar to the cotter, for example.
A method such as rolling a roller with corresponding protrusions on the concrete surface is used, but the details are omitted.

S5: Curing until the concrete 3 hardens to the extent that it can maintain the shape of the concrete.

After the step S5, the formed PC board 3
A laying frame 4 made of, for example, plywood is placed on top of the board, and the steps from S2 onwards are repeated to produce a large number of PC boards 3.

"Problems to be Solved by the Invention" The method for manufacturing PC boards described above has the advantage that the space required for the work is small because the PC boards 3 are manufactured one after another while stacking them. After forming the PC board 3, manufacturing of the upper PC board 3 cannot be started unless a curing period (for example, 1 day) has passed until it reaches a predetermined hardening state. There is a problem in that it takes a long time to obtain a PC board.

The present invention was proposed in view of the above-mentioned circumstances, and an object of the present invention is to provide a manufacturing method that can produce a required number of PC boards in a short period of time.

"Means for Solving the Problems" In order to achieve the above object, the present invention includes a step of pouring concrete to form the n-th PC board, and a step of pouring concrete to form the A PC board is manufactured from the steps of placing a paving frame with the same planar shape on top of the concrete, and pouring concrete on top of the paving frame to form the n+1th PC board. At the same time, a large number of protrusions are formed on the lower surface of the paving frame placed on the n-th concrete.

"Operation" The protrusions on the lower surface of the paving frame are pressed against the uncured concrete of the n-th stage, and can form a large number of recesses serving as bumpers on the surface thereof. Furthermore, even when concrete is placed in the n+1 stage, it is possible to wait for the concrete to harden while maintaining the shape of the concrete with the protrusions present.

"Embodiment" Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the figure, parts common to the conventional example are given the same reference numerals to simplify the explanation.

First, to explain the paving form 5 applied to this conventional example, this paving form 5 has a lower concrete layer 3 on the lower surface of a plate-shaped main body 6 made of plywood or the like similar to the conventional formwork.
It has a structure in which a large number of protrusions 7 are provided on the upper surface of the n to form a bumper.

Next, a method for temporarily manufacturing a PC using this laying frame 5 will be explained in terms of steps.

A side formwork 2 is provided on the concrete bed 1 provided in SIO:GL.

SLl: Necessary reinforcing bars (not shown) are arranged inside the side formwork 2.

S12 Concrete 3a is poured into the side formwork 2.

S13. When the paving frame 5 is placed on the concrete 3a, a potter is formed on the upper surface of the concrete 3a.

Then, after installing the paving form 5, the above-mentioned SIO to S13 are repeated to form the second, third, etc. concrete 3.
Form b, 3C, and 3d in sequence.

In addition, in the above manufacturing method, even if the concrete is in an unhardened state, the shape of the pot can be maintained by the paving frame 5, and therefore the concrete 3 in an unhardened state can be
P while laminating multiple layers of a and 3b...
A C plate can be manufactured.

It should be noted that the shape of the paving frame is not limited to the above-mentioned embodiment, and may of course be changed as appropriate depending on the shape of the PC board to be manufactured and the shape of the board to be formed thereon.

In addition, the number of tiers of PC board that can be formed at the time of - differs depending on its shape, properties of concrete, etc., but in general, PC board
When forming plates in multiple stages, each time concrete is poured in multiple stages (nth S13 and n+1
It is desirable to have a curing period (between the second SIO).

Furthermore, it is desirable that a treatment be applied to facilitate separation between the concrete at the bottom and the concrete bed, such as by providing a paving frame.

"Effects of the Invention" As is clear from the above explanation, the present invention
a step of pouring concrete to form a board; a step of placing a paving frame with the same planar shape on top of the poured concrete before it hardens; Pour concrete on top and install PC on the n+1st stage
In addition to manufacturing the PC board from the process of forming the board, a large number of protrusions are formed on the bottom surface of the paving frame placed on the n-th concrete, so the PC board is stacked. Therefore, a large number of PC boards can be manufactured in a short period of time and with a good space factor.

[Brief explanation of the drawing]

1 to 5 show an embodiment of the present invention,
Fig. 1 is a side sectional view of a PC board being manufactured, Fig. 2 is a plan view of a laying frame used in one embodiment, Fig. 3 is a side view, and Fig. 4 is a bottom view. Figure 5 is a flowchart showing the manufacturing process, Figures 6 and 7 show a conventional example of a PC board manufacturing method, Figure 6 is a side sectional view of the PC board being manufactured, and Figure 7 is the manufacturing process. FIG. 3a to 3n...Concrete, 5...Paving frame, 6...Main body, 7...Protrusion. Figure 1 Figure 8 Figure 4 Figure 5 Figure 6

Claims (1)

[Claims] A PC that manufactures a plurality of PC boards by repeating the operation of forming the n+1st stage PC board by placing a laying frame on top of the nth stage PC board and pouring concrete on top of it. In the board manufacturing method, there is a step of pouring concrete to form the n-th PC board, and before the poured concrete hardens, a molding frame with the same planar shape as the concrete is placed on the top of the concrete. It consists of a step of placing concrete on the paving form, and a step of forming the n+1-th PC board by pouring concrete on the paving form. A method for manufacturing a PC board, characterized in that a protrusion is formed to form a PC board.