JPH0154163B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method for forming glass fiber reinforced concrete (GFRC) products, particularly in the form of panels.
This invention relates to a molding method suitable for use in factory production of GFRC products.

Conventional technology and problems GFRC involves mixing mortar or concrete with glass fibers to increase tensile strength and cracking resistance.

GFRC molding methods can be broadly divided into spraying methods and premix methods. The spraying method involves spraying cement paste or mortar and cut glass fiber onto the formwork surface at the same time, and while it is simple and allows spraying to any desired thickness even on complex-shaped formworks,
It requires skilled workers, there is wide variation in quality, the surface is not smooth and splashes easily stick to it,
There are disadvantages such as a large amount of dust generated during construction. The premix method is similar to ordinary concrete, in which the materials are mixed in advance using a mixer and poured into concrete, resulting in stable quality with little variation.
Although GFRC products can be obtained, GFRC has a problem of low fluidity, requiring time for casting, and poor productivity.

OBJECTS OF THE INVENTION The present invention was made in order to improve the drawbacks of the premix method as described above, shorten the time required for casting, and improve the productivity of GFRC products of stable quality.

Structure of the Invention The present invention fixes a formwork containing mixed GFRC on a vibration table and applies vibration, and also places a guide frame having the same internal dimensions as the upper opening of the formwork on the formwork. A vibrating plate having almost the same shape as the upper opening surface of the formwork is vibrated from above along the inner surface of the guide frame and pressed against the GFRC inside the formwork, thereby promoting the flow of GFRC, and quickly touching every corner of the formwork. This is a molding method for GFRC products that allows GFRC to be spread throughout the entire range.

Embodiment FIGS. 1 and 2 are cross-sectional views illustrating the process of forming a floor panel according to the method of the present invention, FIG. 3 is a plan view of the upper vibration device, and FIG. 4 is a perspective view of the completed floor panel. The floor panel 1 is used for a double floor in a computer room, etc., and has a size of 50 cm x 50 cm and a thickness of 2 cm. The molding equipment includes formwork 2, vibration table 3,
It consists of a diaphragm 5, a guide frame 6, a vibrator 7, etc. The formwork 2 is placed on the vibration table 3, which is fixed with a clamp 4, and is vibrated by a vibrator (not shown).
The vibrations are transmitted to the formwork. diaphragm 5, guide frame 6,
The vibrator 7 is integrated as an upper vibrating device b and is suspended by a wire 11. The diaphragm 5 is an iron plate having substantially the same shape and dimensions as the upper opening surface of the formwork, and is coupled to a vibrator 7 via a reinforcing member 12, and is vibrated by operating the vibrator 7. The guide frame 6 has the same inner dimension as the upper opening of the form, and the diaphragm 5 can move up and down relatively along the inner surface of the guide frame 6. The diaphragm 5 does not come off the guide frame 6 due to the action of the stoppers 9 and 10. A guide rod 8 is fixed to the outer surface of the guide frame 6 to ensure easy and reliable placement on the formwork 2. The formwork 2 into which a certain amount of GFRC has been introduced by a concrete injection machine is fixed on a vibrating table 3 with clamps 4, as shown in FIG. The GFRC may be introduced on the shaking table, or may be placed at another location and moved onto the shaking table using a conveyor or by hand. GFRC generally has poor fluidity; for example, the slump value of GFRC containing 2.5% glass fiber by volume is 0, and the GFRC input is shown in Figure 1.
As shown in the figure, they form a heaped shape.

Next, the upper vibrating device b is gradually lowered, and the guide frame 6 is placed at an accurate position on the formwork 2 using the guide rod 8. When the wire 11 is further loosened while vibrating the vibration table 3 and the vibration plate 5, the vibration plate 5 gradually descends along the inner surface of the guide frame 6.
As the GFRC is pressed, vibrations are applied to the GFRC from above and below, increasing its fluidity, and the GFRC quickly spreads to every corner of the formwork, resulting in the state shown in Figure 2. At this time, excess mortar components and moisture are discharged to the outside from between the formwork and the guide frame. Note that the diaphragm 5 stops lowering at a predetermined position by the action of the stopper 10. Thereafter, when the wire 11 is wound up, the diaphragm 5 rises along the inner surface of the guide frame 6, and eventually rises together with the guide frame 6 when it comes into contact with the stopper 9. After surface treatment such as smoothing with a trowel, the clamp 4 of the formwork 2 is removed and the formwork 2 is transported from the vibrating table 3 to a curing space. After curing is completed, the formwork is removed to complete the floor panel shown in Figure 4.

In the case of the conventional method of forming by vibrating only the formwork, the vibration time required 1 to 3 minutes, but in the case of this embodiment, forming can be completed in about 10 seconds of vibration.

Effects of the invention According to the method of the present invention, in the premix method,
By significantly shortening the time required to apply vibration, which is essential for GFRC molding, it is possible to improve the productivity of GFRC products with stable quality. Furthermore, unlike simple press forming, the method of the present invention increases fluidity by applying vibration from above the GFRC, so the pressure applied from above is sufficient from the weight of the equipment such as the diaphragm or vibrator, and the press equipment is It can be carried out using extremely inexpensive and simple equipment without the need for molding, and can be easily applied to molding large products such as curtain walls.

In addition, the vibration plate that is pressed from above has almost the same shape as the opening surface of the formwork, and by using a guide frame, it is possible to press it down easily and accurately from directly above the opening of the formwork, so vibration molding is performed. At this stage, the surface of the concrete product becomes smooth, making it easier to trowel later, and has the excellent effect that excess mortar components, moisture, etc. are discharged to the outside from between the formwork and the guide frame.

[Brief explanation of drawings]

1 and 2 are cross-sectional views illustrating the process of forming a floor panel according to the method of the present invention, FIG. 3 is a plan view of the upper vibration device, and FIG. 4 is a perspective view of the floor panel. 1...floor panel, 2...formwork, 3...vibration table,
4... Clamp, 5... Vibration plate, 6... Guide frame,
7... Vibrator, 8... Guide rod, 9... Stopper, 10... Stopper, 11... Wire, 12... Reinforcement material, a... GFRC, b... Upper vibration device.

Claims (1)

[Claims] 1. In a method for forming a glass fiber reinforced concrete product in which a formwork filled with mixed glass fiber reinforced concrete is fixed on a vibrating table and vibrated, and a vibration plate is vibrated from above and pressed against the concrete, the upper part of the formwork is A guide frame having the same inner dimensions as the opening is placed on the form, and a diaphragm having a shape substantially the same as the upper opening of the form is pressed against the concrete from above along the inner side of the guide frame. A method for forming glass fiber reinforced concrete products.