JPS61188103A - Method of molding glass fiber reinforced concrete product - Google Patents

Abstract

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

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method for molding glass fiber reinforced concrete (GFRC) products, and particularly to a molding method suitable for use in factory production of panel-shaped GFRC products.

Conventional GFRC involves incorporating glass fibers into mortar or concrete to increase tensile strength and cracking resistance.

GFRC molding methods can be broadly classified into spraying methods and premix methods. The spraying method involves simultaneously spraying cement paste or mortar and cut glass fibers onto the formwork surface, and while it is simple and can be applied to formworks with complex shapes at any desired thickness, it requires skilled work. There are disadvantages such as: 1) it requires a lot of labor; 1) there is a large variation in quality; 1) the surface is not smooth and it is easy for repellent particles to adhere to it; and a lot of dust is generated during construction.

The premix method involves mixing the materials in advance with a mixer and casting them in the same way as for ordinary Cosicrete.While it is possible to obtain GFRC products with stable quality with little variation, GFRC has low fluidity and is difficult to cast. There is a problem that it takes time and productivity is poor.

Problems to be Solved by the Invention Although the spraying method and the premix method each have the above-mentioned advantages and disadvantages, one problem common to both methods is the difficulty of surface treatment.

In other words, GFRC is difficult to smooth with a trowel because of the glass fibers mixed therein, and as a result, the surface finish has to be poor. Also.

For products that require a smooth finished surface, this rough surface is polished.

The air bubbles surrounding the glass fibers create numerous small holes on the polished surface, which must be repaired.

Means for Solving the Problems The present invention involves fixing a formwork filled with mixed glass fiber reinforced concrete on a shaking table to apply vibrations, and at the same time forming a grid of thin plates vertically and horizontally to form a large number of rectangular openings. This is a method for forming a glass fiber reinforced concrete product, which is characterized in that two sets of lattice plates having substantially the same planar shape as the upper opening surface of the formwork are pressed against the concrete from above while vibrating.

The lattice plate pushes the glass fibers downward, and from this point of view, it is most effective to set the lattice spacing, that is, the spacing between the thin plates that form it, to a value slightly smaller than 1/2 of the length of the glass fiber (strand). It is true. In addition, the aperture ratio of the lattice board is as large as possible, that is, the thickness of the thin board is determined for strength (:
Good results can be obtained by making it as thin as possible within the allowable range.

Effect The fluidity of GFRC is improved by fixing the mold into which GFRCw is placed on a vibration table and applying vibration. Furthermore, the fluidity of the GFRC is further improved by pressing the lattice assembly plate from above while vibrating it, and with the added pressure of the lattice assembly plate, the GFRC is quickly cast to every corner of the formwork. In addition, the lattice board pushes the glass fibers near the surface downward, and the mortar that does not contain glass fibers enters the openings of the lattice board, as shown in Figure 5. A layer m is formed and the surface treatment is easily carried out.

Embodiment Figures 1 and 2 are cross-sectional views illustrating an example of the process of forming a floor panel according to the method of the present invention, Figure 3 is a plan view of the upper vibration device, and Figure 4 is an enlarged view of a portion of the lattice assembly board. A plan view, FIG. 5 is an enlarged view of the main part in FIG. 2, and FIG. 6 is a perspective view of the completed floor panel.

Floor panel 1 is used for a double floor in a computer room, etc., and its size is 50c & × 50CI! Ik, thickness is 2 ports in the center. The molding equipment includes a formwork 2, a vibration table 3, and a lattice assembly plate 5. It consists of a base plate 6, a guide rod 7°, a vibrator 8, etc. The vibrating table 3 is placed on the formwork 2 and fixed with a clamp 4, vibrates by a vibrator (not shown), and transmits the vibration to the formwork. Lattice board 5. Substrate 6. The guide frame 7 and the vibrator 8 are integrated as an upper vibration device, and the wire 12
It is suspended by. The lattice board 5 has a thickness of 1.61
A 1m long flat par is polished into a comb shape (formed vertical thin plate 5
A and horizontal thin plates 5b are assembled in a lattice shape as shown in the fourth factor. The spacing between each thin plate is approximately: I 1.2 rtat, which is slightly smaller than 1/2 of the length of the glass fiber, 25H. The planar shape and dimensions of the lattice board 5 are made to be similar to the upper opening surface of the formwork 2 and slightly smaller. The lower surface of the board 6 has a lattice assembly board 5.

The upper surface is connected to a vibrator 8 via a reinforcing member 3, and the vibrations of the vibrator 8 are transmitted to the lattice assembly plate 5. The guide frame 7 has the same inner dimensions as the upper opening of the formwork, and the lattice assembly plate 5 and the base plate 6 can move up and down relatively along the inner surface of the guide frame 7. The lattice assembly plate 5 and the base plate 6 do not come off the guide frame 7 due to the action of the stoppers 10.11. A guide rod 9 is fixed to the outer surface of the guide frame 7 to ensure easy and reliable placement on the formwork 2.

A formwork 2t into which a certain amount of GFRC has been introduced by a concrete injection machine is fixed on a shaking table 3 with clamps 4, as shown in FIG.

It may be performed at another location and moved onto the shaking table using a conveyor or by hand. Furthermore, the method of fixing the formwork is not limited to the method of clamping, but may be carried out by various known methods. GFRC generally has poor fluidity.1 For example, GFRC containing 2.5% glass fiber by volume has a slump value of 0, and the GFRC that is introduced has a heaped shape as shown by a in Figure 1! I am doing it.

Next, the upper vibrating device bi is gradually lowered, and the guide frame 7 is placed at an accurate position on the mold crusher 2 using the guide rod 9. When the vibration table 3 and the lattice assembly plate 5 are further loosened by the wire 121 while vibrating, the lattice assembly plate 5 gradually descends along the inner surface of the guide frame 7, pressing the GFRC and releasing the G.
Vibrations are applied to the FRC from above and below, increasing fluidity and increasing the GFR.
C spreads to every corner of the formwork in a short period of time, resulting in the state shown in Figure 2. In addition.

The lattice assembly plate 5 stops descending at a predetermined position by the action of a stopper l, but this position is at the GF as shown in FIG.
It is set so that it is recessed about 4 depths below the surface of RCa. The lower end of the lattice board 5 pushes the glass fibers near the surface of the GFRCa downward, while the mortar that does not contain glass fibers enters the openings of the lattice board 5. As a result, the GFRC forms a mortar layer m that does not contain glass fibers near the surface. It is divided into a layer f containing glass fibers below it.

If the wire 12a' is wound up after the state shown in FIG.
The lattice assembly plate 5 and the board 6 rise along the inner surface of the guide frame 7, and when they eventually come into contact with the stopper 10, they rise together with the guide frame 7.

After surface treatment such as smoothing with a trowel, the formwork 21□ is demolded and the surface is polished to complete the floor panel shown in FIG.

In the case of the conventional method of forming by vibrating only the formwork, the vibration time is 1 to 3 minutes (in the case of this example, forming can be completed with about 10 seconds of vibration). In addition, because of the mortar layer formed on the surface, troweling was extremely easy, and even after polishing after demolding the form, no air bubbles appeared at all, and there was no need for repair.

Effects of the Invention According to the method of the present invention, GFRC in the premix method
By significantly shortening the time required to apply the necessary vibrations, it is possible to improve the productivity of stable GFRC products of 1 quality, and because the mortar layer is formed near the surface, surface treatment is extremely easy. At the same time, since the glass fibers are concentrated below the surface of the product, the glass fibers can be saved if they are set on the lower tensile stress side of the product.

Furthermore, unlike simple booth molding, the method of the present invention
Since the fluidity is increased by applying vibration from above, the weight of the equipment such as the lattice assembly plate and vibrator is sufficient to apply pressure from above, and there is no need for press equipment, making it extremely cheap and simple. This method can be carried out using suitable equipment, and can also be easily applied to the molding of large products such as curtains and falls. .

[Brief explanation of the drawing]

Figures 1 and 2 are cross-sectional views illustrating the process of forming a floor panel by the method of the present invention, Figure 3 is a plan view of the upper vibration device, Figure 4 is a partially enlarged plan view of the lattice assembly board, FIG. 5 is an enlarged view of the main part in FIG. 2, and FIG. 6 is a perspective view of the completed floor panel. l...floor panel, 2...formwork, 3...vibration table, 4
... Clamp, 5... Grid assembly board, 6... Board, 7
...Guide frame, 8...Vibrator-19...Guide rod, 10...Stopper, 11...Stopper, 1
2...Wire, 13...Reinforcement material, a...GFR
C, b... Upper vibration device patent applicant Yutaka 1) Back side Goto Concrete Sales Co., Ltd. agent Patent attorney Moka Kobe
Kiyoshi Kobe Figure 2 Figure 4

Claims (1)

[Claims] The formwork filled with mixed glass fiber reinforced concrete was fixed on a vibration table and vibrated, and the thin plates were assembled in a lattice pattern vertically and horizontally to form a large number of rectangular openings. A method for forming a glass fiber-reinforced concrete product, which comprises pressing a lattice assembly plate having the same planar shape against the concrete from above while vibrating it.