JPH038403Y2 - - Google Patents

Description

[Detailed description of the invention] <<Field of industrial application>> The present invention is a formwork for a centrifugal concrete forming machine to obtain a column having a hollow cross-sectional shape and into which main reinforcing bars can be installed later. Regarding equipment.

<<Prior Art>> In recent years, precast concrete has been used in high-rise buildings because of its high construction efficiency for reinforced concrete structures and its ability to produce high-quality concrete products.

Increasingly, hollow columns made of precast concrete are used to connect columns and beams of precast concrete columns and to connect columns together in the axial direction.

Such hollow columns are generally made using a centrifugal concrete forming machine, and when concrete is poured into the formwork while rotating, the concrete adheres tightly to the inner wall of the formwork due to centrifugal force. While continuing to cure, a hollow column is obtained.

The above-mentioned molds were generally cylindrical because they were rotated, but there were also rectangular molds.

《Problem that the invention aims to solve》 However, building columns are usually formed with a rectangular cross section, and there are not many cases in which a cubic column form is rotated by a centrifugal forming machine. This was due to the fact that it was strong enough to withstand centrifugal force and that demolding was difficult.

The present invention was developed in view of the circumstances described above, and its purpose is to create a pre-cast hollow column with a pre-cast PC that facilitates connection with other members and allows for the installation of main reinforcing bars later. The present invention provides a formwork device for a centrifugal concrete forming machine for obtaining columns.

<Means for Solving the Problems> In order to achieve the above object, the formwork device for the centrifugal concrete forming machine according to the present invention consists of three-dimensionally assembling reinforcing bars for plates, and applying mortar to fill the lower half of the formwork device. Alternatively, the exposed reinforcing surface side of the PC plate obtained by pouring concrete, etc. is used as a weir plate with the concrete pouring side facing.

《Operation》 Post-cast concrete adheres to the reinforcing bars exposed on the concrete pouring surface, so the weir plate and post-cast concrete are strongly integrated, and since the weir plate is reinforced concrete, it is strong enough to withstand the centrifugal force of the centrifugal forming machine. withstand

<<Example>> Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

Figure 1 shows PC version 1 used for formwork weir board.
This PC version 1 is made by bending thin steel wire vertically into an equilateral triangle shape, developing a three-dimensional wire mesh 2 in which the triangles are continuous vertically and horizontally on the same plane, and placing mortar 3 in the lower half of the wire mesh 2.

The exposed tops of the three-dimensional wire mesh 2 are at the apex angles of the above-mentioned equilateral triangle, and the steel wires 4 are laid lengthwise and laterally between the exposed tops. The lower half of the three-dimensional wire mesh 2 serves as reinforcing bars for the mortar 3.

FIG. 2 shows an outline of the formwork device 5. This formwork device 5 is generally firmly assembled into a square cube shape with the exposed surface of the three-dimensional wire mesh 2 of the PC plate 1 facing inside, and is configured to have a rectangular cross section. Then, square members 6 having a right triangular cross section are passed through the four corners to temporarily fix them.

As a means of temporary fixing, it may be lightly fastened to the steel wire 4 with a wire. Further, the means for assembling the PC version 1 into a square shape may be to wrap a band around its outer periphery and tie it tightly.

However, when the formwork device 5 is used, its side openings are closed, leaving an opening for pouring concrete. Further, disks 7 are fitted on both sides of the formwork device 5, and placed on a centrifugal concrete molding machine 8 as shown in FIG. 3, and by rotating the disks 7, the formwork device 5 is rotated.

The centrifugal concrete molding machine 8 has rotating wheels 9 - 9 a spaced apart from each other on the left and right, one of the rotating wheels 9 being a driving wheel 11 attached to the output shaft of a motor 10 .
and rotate it through the belt 12.

A concrete pressure feed hose is rotatably connected to the center of the iron plate that closes the side opening of the formwork device 5, the formwork device 5 is rotated, and concrete is poured in while further increasing the rotational speed.

Centrifugal force causes the concrete to coagulate, and excess water flows out from the edges of the formwork. It is desirable to drain as much excess water as possible during rotation to obtain high quality concrete.

When the concrete is almost solidified, the centrifugal concrete forming machine 8 is stopped, and the iron plate and square timber 6 closing the side end surfaces of the formwork device 5 are removed. When removed, a product as shown in Figure 4 is obtained. This is a square column 13 with a rectangular space formed inside by centrifugal force and the square members 6.

The PC plate 1 and post-cast concrete 14 are firmly attached and integrated at the part of the three-dimensional wire mesh 2 protruding from the surface of the PC plate 1.

That is, the formwork device 5 serves as an outer formwork for the prism 13, and serves as a constituent material of the prism 13 as it is, and there is no need to remove it from the mold. Then, concrete is cast on-site into the internal space of the square column 13 through the column main reinforcement.

Furthermore, it reduces the work process on site and
In order to increase the strength of the resulting prism 13, the formwork device 5 may be configured as shown in FIG.

In this case, hoop lines 16 into which doughnut-shaped spacers 15 are fitted are arranged intermittently in the axial direction inside the formwork device 5 of the previous embodiment. In this case, the square members 6 are placed at the corner positions of the hoop stripes 16.

A prism 13 provided with hoop lines 16 in advance is obtained.

It is preferable to arrange a core (not shown) in the hoop reinforcement 16 for restraining the main reinforcement arranged in the intermediate part to improve the adhesion integrity between the cast-in-place concrete and the square column 13.

[Effects] As explained in detail above, the present invention can sufficiently withstand the centrifugal force of a centrifugal concrete forming machine.
By using a PC plate, it is possible to form a hollow column with a rectangular cross section that is dense and has excellent strength.

Furthermore, since the PC plate also serves as a formwork dam and does not involve demolding work, it has the effect of greatly improving work efficiency.

[Brief explanation of the drawing]

All figures relate to embodiments of the present invention, and Figure 1 is
A perspective view showing the PC plate, Fig. 2 is a plan view showing a formwork device for a centrifugal concrete forming machine constructed by assembling the PC plate shown in Fig. 1 into a rectangular shape, and Fig. 3 is a plan view showing the formwork device shown in Fig. 2. A side view showing the state of the arranged centrifugal concrete molding machine, FIG. 4 is a plan view illustrating a hollow column obtained by the formwork device of the present invention, and FIG. 5 is a formwork according to another embodiment. FIG. 3 is a cross-sectional view showing the device. 1... PC version, 2... Three-dimensional wire mesh, 3... Mortar, 4... Steel wire, 5... Formwork device, 6... Square timber,
7...Disc, 8...Centrifugal concrete forming machine, 9
... Rotating wheel, 10 ... Motor, 11 ... Drive wheel,
12...belt, 13...prismatic column, 14...concrete, 15...spacer.

Claims (1)

[Scope of utility model registration request] For use with a centrifugal concrete forming machine that creates a weir plate with the exposed side of the reinforcing bars on the PC plate obtained by assembling reinforcing bars three-dimensionally for the board and pouring mortar or concrete to fill the lower half of the board. formwork equipment.