JPH0319805A - Precast concrete formed body and manufacture thereof - Google Patents

Abstract

PURPOSE:To manufacture high quality precast concrete formed bodies having specified dimensions and shape by a method wherein annular forming space is produced by partitions between a tubular outer form having a polygonal cross-section and inner forms, which are provided in the interior of the outer form, and divided by partitions so as to feed concrete in the outer form in order to centrifugally form it by rotating the form. CONSTITUTION:A centrifugal form consists of an tubular outer form 1 having a rectangular cross-section, four triangular prismatic inner forms 2, which stand adjacent to four corner parts 1a in the outer form, and plate-like separating members 4, which are arranged in the longitudinal direction of the outer form 1 at the respective corner parts 3a of an annular forming space 3 produced by partitioning by the outer form 1 and the inner forms 2. Each inner form 2 is arranged so as to face its corner part 2a to each corner part 3a. Both ends of the outer form 1 and of the respective inner forms 2 are joined each other with end plates 5. Further, the hollow internal space of the outer form 1 is clogged with the end plates 5. Two circular plates 6 for rotationally driving are installed on the outer periphery sides of the outer form 1 so as to be seated on both the driving side drum 8 and the driven side drum 9 of a rotationally driving device 7 for the rotation of the form.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a flat plate-shaped precast concrete form body (hereinafter referred to as a PC form body) and a method for manufacturing this PC form body by centrifugal drilling. The present invention relates to a manufacturing device for a PC mold body.

(Conventional technology) When constructing buildings, the use of PC formwork for beam members and column members reduces the assembly and dismantling work of formwork at the construction site, thereby shortening the construction period. A construction method that aims to achieve this is known. In other words, this construction method uses Yanagawa's PC formwork, such as a U-shaped cross section, and PC formwork for columns, such as a cylindrical rectangular cross section, with dimensions that match beam members and column members that are designed with different dimensions for each site. Formwork bodies are manufactured in advance at a factory or the like, and after these PC formwork bodies are installed at predetermined positions at the construction site, concrete is poured inside the PC formwork bodies for construction.

The PC formwork used in this construction method, for example for beams, consists of two large and small outer formworks with U-shaped cross sections and an inner formwork stacked one on top of the other with a predetermined space between them. Then, concrete was poured between them.

By the way, as mentioned above, manufacturing a PC formwork body by simply pouring concrete between the outer formwork and the inner formwork increases the cost and also makes it impossible to fill the concrete with a high degree of filling. Therefore, there was a problem that the quality was not very good.

Here, a device for manufacturing precast concrete products by centrifugal drilling has been proposed (Japanese Patent Publication No. 56-50846), and by using this device, it is possible to produce high-quality PC formwork bodies of specific dimensions and shapes. It is thought that it can be manufactured.

<<Problems to be Solved by the Invention>> By the way, forming a PC frame body by the centrifugal molding method is superior in that it is possible to form a frame body with higher strength and thinner. The PC formwork produced by the centrifugal molding method is limited in its cross-sectional shape and external dimensions due to the shape and dimensions of the hollow formwork attached to the centrifugal molding machine used, such as the U-shaped cross section or the rectangular cylindrical shape. Because only specific products can be manufactured, molds of various sizes and shapes must be prepared for each site, and the shapes that can be manufactured using these molds are limited, such as a U-shaped cross section or a cylindrical shape with a rectangular cross section. shape. We were only able to supply PC formwork bodies with the following dimensions.

For this problem, if we consider flat PC formwork elements as PC formwork bodies, if we adopt such flat PC formwork elements, we can solve the problem by connecting them. It can be adapted to floors and walls of various shapes, and can be used as PC formwork for floors and walls, and by combining these, it can be used for pillars of various sizes and shapes, and Yanagawa's PC formwork. Since it can also be used as a device, the above-mentioned size and shape limitations can be solved.

However, it has not been possible to directly manufacture such a flat PC frame body by a similar centrifugal molding method.

The present invention was made in view of the above-mentioned circumstances, and its purpose is to be able to accommodate various sizes and shapes, and to be able to be used for walls and floor slabs, as well as for Yanagawa and company use. Another object of the present invention is to provide a flat PC frame body that can be manufactured with high quality using a centrifugal molding method, and an apparatus for manufacturing the same.

(Means for Solving the Problems) The present invention provides a precast concrete formwork manufactured in the form of a flat plate, which includes a cylindrical outer formwork with a polygonal cross section and an inner formwork installed inside the outer formwork. An annular oval space is defined along the circumferential direction between the two, and edge cutting materials are installed between the corners of the inner form and the outer form to divide the annular molding space into sections in the circumferential direction, The concrete is characterized by being shaped by centrifugal force by rotating the outer form while supplying concrete into the outer form.

Further, the present invention provides an outer mold that is formed into a cylindrical shape with a polygonal cross section and is driven to rotate around its axis, and an annular molding that is provided in the outer mold and is formed between the outer mold and the outer mold along the circumferential direction. The method includes an inner formwork that defines a space, and edge cutting materials that are provided between corners of the inner formwork and the outer formwork and divide the annular molding space into sections in the circumferential direction to form flat molding spaces. It is characterized by

(Function) Since the PC frame body of the present invention is manufactured in a flat plate shape by the centrifugal molding method as described above, it is possible to ensure high strength, thinness, and high quality in terms of centrifugal molding.
Because it is a flat plate, it can be made into a variety of sizes and shapes, and can be used for walls and floor slabs, as well as for beams and corporate use.

Further, according to the apparatus according to the present invention having the above-mentioned configuration, the annular molding space having a polygonal cross section defined by the outer mold frame and the inner mold frame is defined into a flat molding space by the edge cutting material. By filling the space with concrete using the method, a flat PC formwork can be obtained. In addition, as for the outer formwork and the inner formwork, it is sufficient to prepare a formwork for forming a cylindrical formwork body with a polygonal cross section and attach the edge trimming material directly to this formwork, and the flat PC A formwork body can be manufactured easily and inexpensively.

(Embodiments) Below, preferred embodiments of the present invention will be described in detail based on the accompanying drawings.

FIG. 1 is a front sectional view showing a centrifugal molding frame of a PC mold body manufacturing apparatus according to the present invention, FIG. 2 is a perspective view thereof, and FIG. 3 is a device for rotationally driving the centrifugal molding frame. FIG. 4 is a front cross-sectional view of a PC frame body of the present invention centrifugally molded using a centrifugal molding frame, and FIG. 5 is a perspective view of the manufactured PC frame body of the present invention.

The PC formwork of the present invention is basically a precast concrete formwork manufactured in the form of a flat plate, and includes a cylindrical outer formwork 1 with a polygonal cross section and an inner mold installed inside the outer formwork 1. An annular molding space 3 is defined along the circumferential direction between the inner form 2 and the outer form 1, and edge cutting materials 4 are installed between the corners 1a of the inner form 2 and the outer form 1 to form an annular oval space. 3 is divided into sections in the circumferential direction, and by rotating the outer form 1 while supplying concrete into the outer form 1, it is shaped by centrifugal force.

The PC formwork manufacturing apparatus of the present invention basically includes an outer formwork 1 formed into a cylindrical shape with a polygonal cross section and driven to rotate around its axis, and an outer formwork provided within the outer formwork 1. an inner formwork 2 defining an annular molding space 3 along the circumferential direction between it and the outer formwork 1;
It is constituted by an edge cutting material 4 provided between the inner formwork 2 and the corner portion 1a of the outer formwork 1 and dividing the annular oval space 3 into sections in the circumferential direction to form a flat molding space 3b.

As shown in FIGS. 1 to 3, the centrifugal molding frame includes a cylindrical outer formwork 1 having a rectangular cross section and a considerable length, and four parts inside this outer formwork 1. An outer mold is placed at each corner 3a of an annular molding space 3 defined by four triangular prism-shaped inner molds 2 arranged close to each corner 1a, and the outer mold 1 and the inner mold 2. It mainly consists of a plate-shaped edge cutting material 4 arranged along the longitudinal direction of the frame 1.

In the inner formwork 2, the corner portions 2a formed at right angles are connected to each corner portion 3.
It is placed facing A. The outer formwork 1 and each inner formwork 2 are connected to each other by end plates 5 at both ends in the longitudinal direction, and the hollow internal space of the outer formwork 1 is closed by the end plates 5 (Fig. 2). reference).

Further, two rotary drive discs 6 are attached to the outer circumferential side of both ends of the outer formwork 1, and these rotary drive discs 6,
It is placed on the drive side drum 8 and driven side drum 9 of the rotary drive device 7 shown in FIG. 3, and is rotated about the axis of the outer form 1. Although not shown, a concrete supply pipe is rotatably attached to one end plate 5 in alignment with the axial center position of the outer formwork 1, and this supply pipe is passed through the concrete supply pipe. Concrete is supplied into the outer formwork 1 from a concrete pump.

Further, the edge cutting material 4 is shaped like a plate and is provided so as to connect the opposing corners 1a and 2a of the outer formwork 1 and the inner formwork 2,
The annular molding space 3 is partitioned into four flat molding spaces 3b. In addition, as shown in FIG. 1, a corner material 10 is arranged in the annular molding space 3 along the axial direction at the corner portion 1a of the outer formwork 1, corresponding to the mounting position of the edge cutting material 4. These corner materials 10 are flat plate-shaped P as shown in FIG.
For example, a mating surface 11a is formed when the C-shaped frame body 11 is used as a wall material.

Further, for the edge cutting material 4, for example, foamed polystyrene or the like is used.

Therefore, when the centrifugal forming form made in this manner is placed on the rotary drive device 7 and concrete is poured into the centrifugal forming form while rotating, the concrete is moved between the inner form 2 and the outer form by centrifugal force. Annular molding space 3 between frame 1
The material is filled into the inner wall of the outer formwork 1, and is layered with an almost uniform thickness while being pressed against the inner peripheral wall surface of the outer formwork 1, and is gradually compacted while excess water contained inside is discharged by centrifugal force. go.

At this time, the annular molding space 3 defined by the outer formwork 1 and the inner formwork 2 is divided into four parts along the axial direction by the edge cutting material 4, so as a result, a flat PC formwork is formed. Four bodies 11 are manufactured at the same time with high quality (see FIGS. 4 and 5).

In addition, in FIG. 4, the reference numeral 13 indicates the slit after the edge cutting material 4 is removed.

According to the above-described apparatus, the annular molding space 3 having a polygonal cross section defined by the outer formwork 1 and the inner formwork 2 is defined into a flat plate molding space 3b by the edge cutting material 4. A flat PC frame body 11 can be obtained by filling the space 3b with concrete using a molding method. Also,
As for the outer formwork l and the inner formwork 2, it is sufficient to prepare a formwork for forming a cylindrical formwork body with a polygonal cross section and attach the edge cutting material 4 directly to this. The PC frame body 11 can be manufactured easily and at low cost.

The flat PC formwork body 11 produced in this manner can be used particularly as a slab omniform or wall formwork, and can also be used not only as a formwork for these but also for beams and columns. That is, as shown in FIG. 6, adjacent PC mold bodies 11 are connected by aligning their mating surfaces 11a, and then a pair of opposing PC mold bodies 11 are connected.
It can be used by filling the space with concrete 14.

In addition, when the flat PC formwork body 11 is used for the outer wall,
You can also lay tiles. Furthermore, if the width of each PC frame body 11 is approximately 60 cm, there is an advantage that a variety of shapes can be accommodated by combining a plurality of PC frame bodies 11. Furthermore, when the PC frame body 11 is used for a wall, shrinkage joints can be easily removed at the mating surfaces 11a, and a crack-free finish can be ensured.

Further, pretension/prestress may be introduced into the PC frame body 11. When the PC formwork body 11 manufactured by introducing pretension and prestress in this way is used as a formwork for a floor slab or a beam, it becomes possible to make the structure unsupported.

In order to reinforce the PC frame body 11, a structure may be adopted in which a sleeve reinforcing member 15 such as a wire mesh is embedded in the PC frame body 11 as shown in FIGS. 4 and 5.

In addition, in the above-mentioned embodiment, the edge cutting material 4 is attached to each corner 3 of the annular molding space 3 defined by the outer formwork 1 and the inner formwork 2.
Although the configuration is such that the configuration is arranged at point a, the configuration is not limited to this. For example, the edge cutting material 4 is
If the configuration is such that only one PC frame body 11 is arranged in these places, one PC frame body 11 having a flat plate shape and one PC frame body 11 having a concave cross section can be manufactured at the same time. In this case, the flat PC formwork 11 can be used as a wall formwork or the like, and the remaining PC formwork 11 having a concave cross section can be used as a beam formwork or the like. Further, in this case, the lower left and right corner members 10 in FIG. 1 become unnecessary.

The PC frame body 11 described above is manufactured into a flat plate shape by the centrifugal molding method as described above, so it is possible to ensure high strength, thinness, and high quality from the viewpoint of centrifugal molding, and it is also flat plate shaped. Because of this, it can be used in a variety of sizes and shapes, and can be used for walls and floor slabs, as well as for beams and housing.

That is, it is a high-quality flat PC formwork 11 that can be used as a slab omniform or wall formwork, and can also be used not only as a formwork for these but also for beams and columns. Furthermore, by combining a plurality of sheets, it is possible to deal with various spans, and even if the sizes and shapes differ from site to site, it can be easily handled.

Furthermore, this device "injects concrete into this centrifugal hollow form and performs centrifugal forming, and in addition to the flat PC form body 11, other predetermined shaped PC form bodies are simultaneously manufactured. can improve manufacturing efficiency and produce high-quality P.
It also has the effect of being able to manufacture a C-shaped frame body.

In addition, although the cross section of the outer frame 1 is rectangular in the above-mentioned embodiment, it is not limited to this, and may be a polygonal shape other than a rectangular shape.

(Effects of the Invention) In summary, according to the present invention, the following excellent effects are achieved.

(1) Since the PC frame body is manufactured in a flat plate shape by the centrifugal molding method as described above, it is possible to ensure high strength, thinness, and high quality in terms of centrifugal molding, and it is flat plate-shaped. From this point of view, it exhibits the characteristic that it can be used in various sizes and shapes, and can be used for walls and floor slabs, as well as for beams and columns. In addition, by combining multiple sheets, it is possible to accommodate various shapes, and even if the sizes and shapes differ from site to site, it can be easily handled.

(2) The annular molding space with a polygonal cross section defined by the outer formwork and the inner formwork is defined as a flat plate molding space by edge cutting materials, and the space is filled with ready-mixed concrete using the centrifugal molding method. By doing so, a flat PC frame body can be obtained. In addition, for the outer formwork and the inner formwork, it is sufficient to prepare a formwork for shaping the cylindrical formwork body with a polygonal cross section and attach the edge trimming material directly to this formwork. P
A C-shaped frame body can be manufactured easily and inexpensively.

[Brief explanation of the drawing]

FIG. 1 is a front sectional view showing a centrifugal molding frame of a PC mold body manufacturing apparatus according to the present invention, FIG. 2 is a perspective view thereof, and FIG. 3 is a device for rotationally driving the centrifugal molding frame. FIG. 4 is a front sectional view of the PC mold body of the present invention centrifugally molded by a centrifugal molding frame, FIG. 5 is a perspective view of the manufactured PC mold frame body of the present invention, and FIG. 6 FIG. 2 is a sectional view showing an example of use of the PC frame body of the present invention. 1... Outer formwork 2... Inner formwork 3... Annular molding space 4... Border cutting material a... Corner a of outer formwork... Corner b of inner formwork...・Flat molding space 1...Flat PC mold frame body

Claims (2)

[Claims] (1) In a precast concrete formwork manufactured in the form of a flat plate, an annular shape is formed along the circumferential direction between a cylindrical outer formwork with a polygonal cross section and an inner formwork installed inside the outer formwork. Defining a molding space and dividing the annular molding space into sections in the circumferential direction by installing cutting materials between the corners of the inner formwork and the outer formwork, and supplying concrete into the outer formwork. 1. A precast concrete formwork body, characterized in that the outer formwork is rotated while the outer formwork is rotated so that the formwork is formed by centrifugal force. (2) Annular forming along the circumferential direction between an outer mold formed into a cylindrical shape with a polygonal cross section and driven to rotate around its axis, and the outer mold provided within the outer mold. an inner formwork that defines a space; and a edging material that is provided between the inner formwork and a corner of the outer formwork and divides the annular molding space into sections in the circumferential direction to form a flat plate molding space. A manufacturing device for a precast concrete form body, characterized by the following: