JPH06122108A - Method and apparatus for producing fiber reinforced cement molded product - Google Patents

Abstract

PURPOSE:To produce a fiber reinforced cement molded product reduced in wt. and having a high strength. CONSTITUTION:A core material 3 having specific gravity lower than that of a fiber reinforced cement fluid 1 is arranged in a form 2 and a plurality of pins 4 for preventing the flotation of the core material 3 accompanied by the pouring of the fiber reinforced cement fluid 1 into the form 2 are preliminarily attached to the form 2 at specified positions before the fiber reinforced cement fluid 1 is poured into the form 2 so that the tips thereof are brought into contact with the core material. The fiber reinforced cement fluid 1 is poured into the form 2 while vibration is applied to the form 2 and, after the pouring of the fiber reinforced cement fluid is completed, vibration is stopped to pull out the pins 4 and the fiber reinforced cement fluid 1 is cured to be demolded from the form 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a manufacturing method and an apparatus for forming a fiber-reinforced cement molded product having a light weight by casting a fiber-reinforced cement fluid into a mold to mold it.

[0002]

2. Description of the Related Art Conventionally, in order to reduce the weight of a fiber-reinforced cement molded product, the molded product is formed with a space to reduce the overall weight. As a method for producing a cement molded product, a plurality of divided pieces forming the molded product are respectively formed, and the respective divided pieces are adhered to each other, whereby the fiber-reinforced cement molded product in a state in which the space is included. Was being manufactured.

[0003]

According to the above-described conventional method for producing a fiber-reinforced cement molded product, the joint between the divided pieces appears on the outer peripheral surface of the finished fiber-reinforced cement molded product, which is aesthetically preferable. At the same time, there is a problem that it takes time and effort to form the divided pieces separately and bond them.
Furthermore, because the divided pieces are spliced together,
There is also a risk that the overall strength will decrease.

As a method for producing a fiber-reinforced cement molded product which solves the above-mentioned problems, there is provided a centrifugal molding method capable of integrally forming a molded product having a seamless outer peripheral surface and having the space therein. You can

However, in order to perform centrifugal molding, a certain degree of fluidity is required for the fiber-reinforced cement fluid because the fiber-reinforced cement fluid is poured into the rotating mold so that it follows the inner peripheral surface of the mold. Becomes However, since the fiber-reinforced cement fluid is intended to strengthen by mixing cut fiber pieces into the cement fluid, the longer the fiber pieces to a certain extent, the higher the strength of the molded product. Since it has a good property but a low strength, in order to carry out centrifugal molding, a short fiber piece is inevitably used, and there is a problem that a molded product cannot be expected to have high strength.

Accordingly, an object of the present invention is to solve the above-mentioned problems and to provide a method and apparatus for producing a fiber-reinforced cement molded product, which can be integrally molded in a lightweight state and can be expected to have high strength. It is in.

[0007]

To achieve this object, the characteristic means of the method for producing a fiber-reinforced cement molded article according to the present invention is to provide the fiber-reinforced cement in a mold for casting by molding a fiber-reinforced cement fluid. A core material having a specific gravity smaller than that of a fluid is arranged, and a pin for preventing the core material from being lifted up when the fiber-reinforced cement fluid is poured into the mold is poured into the mold. Previously, the tip is brought into contact with the core material at a predetermined position in advance in the mold and attached to the molds, and the fiber-reinforced cement fluid is applied to the mold while vibrating the mold. After pouring into the frame and completing the pouring of the fiber-reinforced cement fluid, the vibration is stopped and the pins are extracted, and the mold is demolded after the fiber-reinforced cement fluid is hardened. There is the time.

Further, the characteristic structure of the apparatus for producing a fiber-reinforced cement molded product according to the present invention used in the method for producing the fiber-reinforced cement molded product encloses substantially the entire circumference of the filling space for forming the fiber-reinforced cement molded product. A mold is provided, and an injection port that allows the fiber-reinforced cement fluid to flow into the filling space is provided in the mold, and a core material having a specific gravity smaller than that of the fiber-reinforced cement fluid is formed freely in the filling space. , A plurality of pins for fixing the core material arranged in the filling space are detachably provided on the mold, and vibration is generated to apply vibration to the fiber-reinforced cement fluid poured into the filling space. This is where the equipment is provided.

[0009]

According to the characteristic means of the method for producing a fiber-reinforced cement molded product according to the present invention, since the core material having a smaller specific gravity than the fiber-reinforced cement fluid is incorporated in the molded product, the weight of the molded product as a whole can be reduced. Moreover, since the core material is fixed inside the mold by a plurality of pins, the core material is displaced due to the pouring of the fiber-reinforced cement fluid into the mold or floats up due to buoyancy. It becomes possible to form the molded product in a state in which the core material is stably arranged at a predetermined portion inside the molded product while preventing the occurrence of damage.

Further, since a spraying method in which a fiber-reinforced cement fluid is sprayed and poured into the filling section is possible, it is possible to use a fiber-reinforced cement fluid mixed with fiber fragments of a certain length and to form the mold. Since the integrally formed molded product is manufactured in a state in which the fluid is poured while vibrating to eliminate the bubbles present therein, it is possible to form a molded product having high strength.

Furthermore, since the pin is pulled out after the vibration is stopped, no pin mark is left on the molded product, and it is difficult to impair the appearance.

On the other hand, according to the characteristic construction of the apparatus for producing a fiber-reinforced cement molded product according to the present invention, it becomes possible to more efficiently carry out the above-mentioned method for producing a fiber-reinforced cement molded product.

[0013]

Therefore, according to the method and apparatus for producing a fiber-reinforced cement molded product of the present invention, it is possible to manufacture a lightweight and high-strength integrally molded fiber-reinforced cement molded product without much effort. As a result, it has become possible to reduce manufacturing costs and improve aesthetics.

[0014]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a method of manufacturing a GRC-made round column P (an example of a fiber reinforced cement molded product) formed by a GRC (glass fiber reinforced cement) fluid 1 which is an example of a fiber reinforced cement fluid.

Explaining the manufacturing method of the round pillar P, as shown in FIG. 1 (a), the GRC fluid 1 is directly sprayed into the receiving mold 2a constituting the lower half cross section of the horizontal mold 2. Form 2 in a state of being sprayed and molded by
A styrene foam core material 3, which is an example of a core material having a specific gravity smaller than that of the GRC fluid 1, is arranged at a substantially central portion therein.

Next, as shown in FIG. 1B, a lid mold 2b constituting the upper half section of the mold 2 is mounted on the receiving mold 2a, and the GRC fluid 1 into the mold 2 is attached. A plurality of pins 4 for preventing the core material 3 from rising due to pouring,
The screw member N embedded in the round pillar P for attaching the round pillar P to another object while attaching the base end side to the lid mold 2b in a state where the tip thereof contacts the core material 3 in the mold 2 is also included.
It is attached to the lid mold 2b.

After that, as shown in FIG.
The GRC fluid 1 is poured into the mold 2 by the direct spray method while applying vibration to the GR by using the vibration generator 5.
After the pouring of the C fluid 1 is completed, the vibration is stopped and the pin 4
Is removed, and the mold 2 is demolded after the GRC fluid 1 is cured.

Explaining the manufacturing apparatus of the GRC round pillar P, as shown in FIG. 2, a mold 2 surrounding substantially the entire circumference of the filling space D for forming the GRC round pillar P is provided, and the GRC fluid 1 is supplied. A filling port 6 which can be poured into the filling space D is provided in the mold 2, and a styrofoam core material 3 having a specific gravity smaller than that of the GRC fluid 1 is freely formed in the filling space D. A plurality of pins 4 for fixing the core material 3 arranged therein are detachably provided in the mold 2 and the GR is poured into the filling space D.
A vibration generator 5 for applying vibration to the C fluid 1 is provided and configured.

The GRC fluid 1 is generally composed of a glass fiber having a fiber piece length of about 25 to 50 mm and a cement paste, and is sprayed by a direct spray method in which they are simultaneously sprayed. The orientation is improved and a high-strength molded product can be obtained.

As described above, the mold 2 is composed of two upper and lower parts, a receiving mold 2a for covering the lower half section and a lid mold 2b for covering the upper half section in a state of being installed horizontally. Has been formed. The two molds 2a and 2b are formed so that they can be flange-joined to each other.

Further, the lid mold 2b is provided with a charging port 6 for pouring the GRC fluid 1 into the filling space D in the mold 2.
It is provided along the longitudinal direction and is sprayed on both side edges of the charging port 6 by the direct spray method.
A pair of guide plates 7 that receive the RC fluid 1 and can be poured into the filling space D are provided over substantially the entire length. Further, a plurality of support members 8 for supporting the screw members N are provided between the free ends of the guide plates 7 at intervals in the longitudinal direction of the mold 2. Further, the lid mold 2b is provided with mounting portions 9 at which the pins 4 can be detachably attached to the lid mold 2b from the outside at a plurality of positions at intervals in the longitudinal direction of the mold 2.

The core material 3 has its outer dimensions set so as to ensure a predetermined GRC cover thickness in a state of being embedded in the round pillar P, and is made of expanded polystyrene as described above. Further, a thin plate 10 made of stainless steel is attached to an outer peripheral portion of the core material 3 with which the pin 4 and the screw member N are brought into contact, and the pin 4 is cored by the buoyancy force of the GRC fluid 1 to the core material 3. It is configured so that it can be prevented from penetrating into the material 3 and shifting the position of the core material. Further, the thin plate 10 is provided with a hole 10a into which the small diameter tip of the screw member N can be inserted, and the small diameter tip of the screw member N can be pierced into the core material through the hole 10a. is there.

According to the manufacturing method and the apparatus of the round pillar P of this embodiment, the round pillar P as shown in FIG. 3 can be manufactured without much labor.

[Other Embodiment] Another embodiment will be described below.

<1> The fiber-reinforced cement fluid 1 is
The present invention is not limited to the glass fiber reinforced cement described in the above example, and includes, for example, carbon fiber / aramid fiber /
It may be a mixture of vinylon fiber, steel fiber, etc., and they are collectively referred to as fiber-reinforced cement fluid 1.
Alternatively, the fluid 1 may be put into the mold 2 by a premix method.

<2> The fiber-reinforced cement molded product P
Is not limited to the round pillar described in the previous embodiment, and for example, a square pillar, a wall body, a monument, etc. can be integrally manufactured with light weight and strength.

It should be noted that reference numerals are added to the claims for convenience of comparison with the drawings, but the present invention is not limited to the configurations of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a manufacturing method of a round pillar.

FIG. 2 is a cross-sectional view of the formwork.

FIG. 3 is a perspective view showing a round pillar.

[Explanation of symbols]

 1 Fiber reinforced cement fluid 2 Formwork 3 Core material 4 Pins 5 Vibration generator 6 Input port D Filling space P Fiber reinforced cement molded product

Claims (2)

[Claims] 1. A method for producing a fiber-reinforced cement molded product, comprising molding a fiber-reinforced cement fluid (1) by pouring the fiber-reinforced cement fluid (1) into the mold (2), the fiber-reinforced cement fluid (1) being contained in the mold (2). ), The core material (3) having a smaller specific gravity is placed, and the mold (2)
A pin (4) for preventing the core material (3) from being lifted up when the fiber-reinforced cement fluid (1) is poured into the mold (2). Before pouring, a plurality of the core members (3) are attached to the mold frame (2) by abutting the tips of the core members (3) at predetermined positions in the mold frame (2) in advance. The fiber-reinforced cement fluid (1) is poured into the mold (2) while applying vibration to the mold, and after the fiber-reinforced cement fluid (1) has been poured, the vibration is stopped and the pin (4) is pulled out. A method for producing a fiber-reinforced cement molded product, wherein the mold (2) is demolded after the fiber-reinforced cement fluid (1) is cured. 2. A fiber reinforced cement molded product manufacturing apparatus used in the method for manufacturing a fiber reinforced cement molded product according to claim 1, wherein a filling space (D) for forming the fiber reinforced cement molded product (P) is used. ) Is provided around almost the entire circumference, and the fiber reinforced cement fluid (1) is poured into the filling space (D), and a charging port (6) is provided in the form (2). A core material (3) having a smaller specific gravity than the fiber reinforced cement fluid (1) is formed in the filling space (D) so as to be freely arranged,
A plurality of pins (4) for fixing the core material (3) arranged in the filling space (D) are detachably provided in the mold (2) and poured into the filling space (D). An apparatus for producing a fiber-reinforced cement molded product, comprising a vibration generator (5) for applying vibration to the fiber-reinforced cement fluid (1).