JPS598529B2 - Vibration molding method for GRC molded bodies - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vibration molding method for a GRC molded body subjected to compression compaction.

With the development of glass fibers with excellent alkali resistance, GRC (Glass Fiber Reinforced Cement) has begun to be applied to various applications at ℃ by taking advantage of its lightweight and high strength characteristics.

For example, a flat plate. Tubular bodies and hollow panels can be produced with relatively high productivity using papermaking methods, spray suction methods, etc., and centrifugal molding methods, filament winding methods, extrusion molding methods, etc.
Manufactured.

However, only low-productivity molding methods such as press molding using premix GRC or direct spray molding followed by breaking-in operation with a trowel have been developed for molded bodies of irregular shapes, resulting in larger equipment and lower productivity. In particular, press molding has been able to achieve excellent dimensional accuracy and strength, but it requires expensive molds that can withstand strong pressure. It was something that existed.

The present invention prevents such drawbacks and provides G with high dimensional accuracy.
This was discovered as a result of various research into ways to obtain RC molded bodies without using large press molding equipment.
A GRC is supplied onto a formwork having a desired shape, and a perforated formwork having a shape that partially pairs with the formwork is pressed onto the GRC, and vibration is applied to compact the GRC and remove the perforated formwork. This is a vibration molding method for a GRC molded body, the gist of which is to dehydrate excess water in the GRC through the pores of the pores.

The features of the present invention are that good compaction and dewatering can be performed with low pressing pressure, and that a high-strength GRC molded body can be obtained without requiring expensive large-scale presses and molds. It is.

In other words, in order to press-form a GRC molded body having an area of about 90 crfL x 180 cm at a rate of about 30 Ky/cni, a press of about 500 tons is required, and the form itself is usually made of solid steel. It also has the drawback of being easily scratched when used for purposes other than mass production of the same product.

On the other hand, according to the method of the present invention, sufficient compaction can be achieved using the perforated mold's own weight and/or the pressure applied by a human being, and because of the low pressure, the strength of the formwork is not required. Also, it is difficult to cause scratches on the surface of the formwork.

Another feature of the present invention is that there is little to no need for post-operations such as troweling or rolling, especially when considering the difficulty of such operations on irregularly shaped bodies. , productivity can be significantly improved, and reduction in partial strength or deterioration in dimensional accuracy due to the production of abnormally thin or thick portions can be significantly prevented.

Furthermore, by applying vibration, GRC penetrates into every corner such as the corners and rising parts, and it is possible to obtain a GRC molded body that has a clean surface with no voids and no cracks. It also has the ability to do so.

Furthermore, by compacting in this way, excess water oozes out from the GRC itself and is discharged from the pores of the perforated mold/frame, resulting in the GR(,' molded body becoming dense and the strength of the GRC molded body being increased. It is possible to obtain strength comparable to that of flat GRC formed by the spray suction method.

Furthermore, another feature is that by making the surface of the Q-roll mold frame smooth or with a desired uneven pattern, it is possible to make the surface of the GR (J) shape a light-selective surface or an uneven patterned surface, and the surface decoration after molding can be improved. It may be possible to make it unnecessary as appropriate.

Next, the present invention will be explained in more detail.

The formwork used in the present invention may be made of various materials such as metal, wood, FRP, etc., as long as it does not deform or break during pressurized vibration in the perforated formwork.

Further, the perforated formwork of the present invention may be made of almost the same material as the formwork, and its surface is formed into a shape that allows the GRC molded body to have just the right dimensions when combined with the formwork. The one that is paired with the frame and has pores for dehydration on its surface is used.

A vibration device is attached to the perforated mold to vibrate the perforated form during compression molding to compact the GRC.

When the perforated formwork is in a continuous form such as folded waves or waves, the entire form can be molded with one pair of perforated formworks.

Particularly in this case, it is preferable to use a perforated form having a width equal to or more than one repetition period from the viewpoint of uniform compaction.

Furthermore, if the formwork is not of a repeating continuous form, Qζ pairs of perforated formwork may be used.

Specifically, the required number of perforated formworks are created to pair with the formwork, or, for example, in the case of a formwork that has multiple convex parts with the same shape as the flat part, a flat perforated formwork is created. What is necessary is to create one perforated formwork each in the shape of a frame and a convex portion.

The holes on the surface of the perforated form can be used as long as they have a diameter that allows water to seep out, but the GRC forms a protrusion at most.

Moreover, this perforated formwork can be made into a box shape and a suction dewatering means can be connected thereto.

The GRC of the present invention refers to a cementitious material mixed with glass fibers, which is kneaded with a desired amount of water and supplied to a mold by various manufacturing methods such as a premix method and a spray method.

To be more specific about the GRC formulation, 1 to 1 glass fiber
If the cementitious material is highly alkaline, use alkali-resistant glass fibers or glass fibers coated with alkali-resistant coatings.
It is used in the form of aggregates, textiles, etc.

Cementitious materials include boltland cement, alumina cement, magnesia cement, gypsum, etc. Additives such as sand, gravel, lightweight aggregates, pulp, aggregates such as asbestos fibers other than glass fibers, dispersants, setting time regulators, resins, etc. are added to calcium silicate etc. or mixtures thereof as necessary. A mixture is used.

The amount of water mixed during kneading may be adjusted so that the supplied GRC has a viscosity that does not flow under its own weight.

First, a formwork having a desired shape is prepared, and GRC is supplied onto the formwork to approximately the desired thickness.

This supply can be done by applying pre-mixed GRC to the formwork as described above, by spraying cement mortar and glass roving respectively, or by pre-forming raw GR into a plate shape.
This is done by placing the C plate on the formwork and pressing it.5
Good.

Furthermore, the thickness of the GRC can be set as desired, such as making it uniform or making it thicker only in specific parts, and it is also possible to partially embed wire mesh, glass cloth, reinforcing bars, mounting metal fittings, etc.

Next, a perforated formwork partially paired with the formwork is placed on the GRC, and suppressed molding is performed by applying vibrations.

The term "partially paired" here means that the space formed by the part of the formwork and its paired perforated mold is made to have the desired GRC shape.

For example, FIG. 1 is a cross-sectional explanatory diagram of this process, in which GRC 2 is spray-molded to a substantially uniform thickness on a corrugated formwork 1, and then a perforated mold to be paired with the formwork 1 is placed on this GRC. Place frame 3 and compact by pressing and vibrating.

In the case of a repeated continuous form such as folded waves or waves, it is preferable that the width of the perforated formwork is wider than one period L of the formwork.

Of course, if L is short, multiple periods can be formed into one perforated formwork.

Further, the depth direction in this figure can also be set to an appropriate length.

In addition, the contact surface area of this perforated formwork with GRC (10
Approximately 0 to 5000crA is preferable, and 100c4
If it is less than this, the suppressing pressure tends to be strong and the GRC tends to be extruded to the surrounding area, and the precise shape is particularly easy to bend, which further reduces productivity, which is not preferable.

On the other hand, if it exceeds 5000c4, the suppression pressure tends to decrease,
Further, it tends to be difficult to apply uniform pressure, and furthermore, it tends to be difficult to handle.

The suppression pressure of the perforated mold may be appropriately selected depending on the fluidity of the GRC and the shape of the mold.

Among these, it is preferably about 0.01 to 1% without vibration, and if it is less than 0.01%, the compaction of GRC and the inflow of GRC into corners and voids tend to be insufficient.

If it exceeds 1 degree, the GRC tends to protrude around the perforated formwork, which is not preferable.

This phenomenon is not a problem in the case of press molding, in which the entire body is molded with one mold, because the protruding parts can be easily removed, but in the case of partial manufacturing as in the present invention, it is not a problem. This is not preferable because it tends to cause problems such as having to delete it each time and making that part too thin.

An example of this is shown in FIG.

FIG. 2 is a cross-sectional explanatory diagram illustrating an example in which the suppression pressure in FIG. 1 is made too strong. is formed.

If such a protruding part occurs, it will be impossible to properly compact the perforated formwork without placing the perforated formwork on the GRC unless these parts are removed five times.

For this reason, it is preferable to press with a pressure of 0.01 to 1 in. When pressing with a pressure outside this range, care must be taken to prevent the GRC from protruding or not flowing into the corners.

In particular, if the pressing force when there is no vibration exceeds 5 shocks, this control becomes almost impossible, resulting in an adverse effect, which is undesirable.

For this purpose, it is usually sufficient to apply a pressing force equal to the weight of the perforated formwork and the vibrating device and/or the human load, and an external pressurizing device is usually not required.

In addition, although the explanation above has focused on the case of continuous repeating form, it can also be used in other cases, and it can be used to change the perforated formwork to each form so that it becomes a pair with the part of the formwork. You should do it.

Furthermore, as an application of this, plastic film is placed on the formwork,
Place cloth etc. and integrate it with GRC, or use colored sand, etc.
It is also possible to decorate the surface at the same time by disposing paint or the like and integrating it with the GRC, or by applying a desired uneven pattern to the surface of the formwork and then applying the uneven pattern to the surface of the GRC at the same time.

The vibrating device for vibrating the perforated formwork includes various known vibrating devices,
That is, a general bar type concrete vibrator, concrete formwork vibrator, etc. are used.

The GRC molded body formed in this manner is cured under various curing conditions, and is subjected to surface decoration, perforation, lamination with other members, etc. as necessary.

Curing may be done together with the formwork, but after the GRC has hardened to the extent that it will not deform, it may be removed from the formwork and cured.

Unlike FRP, GRC cannot be immediately demolded except by using a special cement, so it is preferable in terms of productivity that a mold weaker than the mold used for press molding can be used as in the present invention.

Further, the present invention can be carried out continuously or intermittently,
For example, when forming as shown in Figure 1, it is possible to move the perforated formwork little by little towards the back of the figure, that is, towards the back of the figure, or, of course, to form by fixing it at a specific location. Then, it may be moved a certain distance and molded at that location.

Next, an example will be described.

On a folded formwork with a width of 900 U and a length of 1800 Vta and a smooth surface and a height of 70 mm with a period of 1501 u1,
Cement mortar (using early strength boltland cement C/
(S=1, W/C=0.3), alkali-resistant glass fiber (trade name "Alfiber") was tapered to a length of 37u and then sprayed and mixed to give a thickness of 51uIl.

Next, a corrugated perforated formwork made of punched metal with a width of 340mm and a length of 400u with 2φ holes and a porosity of 35% was placed.
While pressing at 0.05%, vibration molding was carried out, and the material was sequentially moved 3 times in the width direction and 5 times in the length direction.

Next, the perforated formwork was removed, and after curing for 28 days in humid air at room temperature, the mold was demolded.

The surface of the GRC corrugated plate GL manufactured in this manner was smooth, well compacted, had no missing parts at any corner, and had a substantially uniform thickness.

As described above, the present invention can efficiently mold irregularly shaped GRC molded bodies, can mold high-strength, defect-free GRC molded bodies without requiring large-scale press equipment, and improves productivity. In the future, it will be possible to apply it to GRC molded bodies of various shapes, and it will also be possible to combine it with other means such as suction dehydration, patterning, processing, etc. Also, in the case of repeated continuous forms, automatic continuous molding will be possible. It is also possible to apply it to etc.

[Brief explanation of drawings]

FIG. 1 is a sectional view illustrating the molding process of the method of the present invention, and FIG. 2 is a sectional view showing the adverse effects. 1: Formwork, 2: GRC, 3: Perforated formwork.

Claims (1)

[Scope of Claims] 1. GRC is supplied onto a mold having a desired shape, and has a shape that partially pairs with the mold and a contact surface area of 100 to 5000 cd.
0.01~I Kr/
A vibration molding method for a GRC molded body, in which the GRC is compacted by pressing with the pressure of CRT and vibrated, and excess water in the GRC is dehydrated through the pores of the perforated formwork. 2. The GR according to claim 1, in which the GRC is supplied onto a repeating continuous form, and a perforated form having a width of at least one cycle of the repeating continuous form is used to pair with the formwork.
Vibration molding method for C molded bodies.