JPS602970B2 - Manufacturing method of ferrocement products - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a method for manufacturing ferrocement products.

Conventionally, when manufacturing ferrocement products such as ships, floating piers, and tanks using formwork, mortar cement was poured after the reinforcing material was assembled in advance from reinforcing bars and wire mesh and set in the formwork. There are two methods used: to fix the wire mesh and reinforcing bars directly to the required wooden formwork using binding needles and then pour cement mortar. In the first method, there is a problem with the accuracy of the reinforcing material assembled with the formwork, and there are disadvantages such as the inability to produce the material unless the shape is simple.In addition, in the latter method, the wire mesh and reinforcing bars are fixed to the formwork with binding needles. Therefore, it is difficult to remove the frame, and since the tip of the needle protrudes from the surface of the product, it is necessary to remove it, and there is a risk that the needle will rust.

Therefore, an object of the present invention is to form a hard resin layer on the surface of the formwork and to remove the drawbacks when using conventional binding needles. A layer is provided to capture the tip of the mold, and a wire mesh and reinforcing bars are placed on top of this layer, fixed with staples, and cement mortar is placed. Therefore, demolding is easy, and the surface is covered with a hard resin layer. A method for producing a good ferrocement product that is smooth, clean, and hard to scratch because it is coated, and the staple tip is buried in the trapping layer without protruding or being exposed, so there is no need to worry about tip removal or rust. It is about providing.

The above and other objects, advantages and features of the present invention will become apparent from the following detailed description of several embodiments of the method of manufacture of the present invention, which are illustrated in the accompanying drawings.

The method for producing a ferrocement product according to the present invention will be explained in detail below with reference to some embodiments shown in the accompanying drawings.

FIG. 1 is a partial cross-sectional view showing a part of a ferrocement product being manufactured by the method of manufacturing a ferrocement product of the present invention. A mold 1 having a shape of
An epoxy resin or a mixture of polyester resin and glass cloth with a gradient of A required wire mesh 5 with an appropriate mesh is placed on the upper surface in one or two layers as required, and reinforcing bars 6 of an appropriate thickness are placed on top of this as reinforcing bars at required intervals. 6 is further covered with one or two layers of wire mesh 7, and then binding needles or staples 8 of an appropriate size are placed on top of the second layer of wire mesh 7 at the required intervals so as to press down the reinforcing bars 6. If the staples 8 are placed and driven with an air gun, for example, the tips of the staples 8 will bend outward within the 4 layers of soft resin without penetrating the 3 layers of hard resin on the surface of the formwork 1. , 7 layers can be suitably fixed to the hard and soft resins 3 and 4, and the required reinforced wire mesh structure can be obtained. Next, a hard resin is sprayed onto this reinforcing wire mesh structure through a second wire mesh layer and nucleated onto the soft resin layer, and while the resin is still uncured, cement mortar 9 is sprayed onto the resin to form reinforcing bars. Drive to the required thickness to bury the wire mesh structure.

After the cement mortar 9 has hardened, it can be easily removed from the formwork 1, and the surface of the ferrocement product formed into the desired shape after being removed from the formwork, that is, the surface on the formwork side, is covered with a hard resin 3. As a result, the fired surface is smooth and clean, and is not easily damaged, and the tip of the staple 8 is not exposed or protruded in any way, so there is no need to worry about removing the protruding tip of the staple or rusting. , a good ferrocement product can be obtained. Example 1 FIG. 2 is a partial sectional view showing an example of manufacturing a small boat using the manufacturing method of the present invention.

This example is an example of making the hull of a yacht with a captain size of 7. First, the inner surface of the wooden form 11 is made to match the shape of the hull of the yacht. Apply a thin layer of scale-forming agent such as alcohol, and apply hard epoxy resin 13 as a hard resin on top of it to a thickness of, for example, 1 to 1.
．． After curing, polyurethane-based soft resin 14 is spray-painted to a thickness of about 1.2 to 2 ribs on top of the 13 layers of hard resin, and after curing. On the upper surface of the 14 layers of soft resin, two layers of wire mesh 15 with a wire thickness of 22 wires and a mesh of 10×1 broadside angle are provided, and on top of this, a mild steel rod 1 with a diameter of 5 skins is placed as a reinforcing bar.
6 are arranged at intervals of about 5 cm in the direction of the ship's length, and then covered with two layers of the same wire mesh 17 as before. Staples 18 of the 3rd grade are driven into the soft resin layer 14 with an appropriate gun at intervals of about 2 ratios, and the wire meshes 15 and 17 and the European steel camellia 18 are fixed to the soft resin layer 14 to form a reinforced wire mesh structure. did. Then,
Epoxy resin is sprayed onto this reinforced wire mesh structure and adhered to a thickness of about 0.1 inch on top of the European resin layer 14, and before the resin hardens, cement mortar 19 is sprayed on top of it. Cement mortar was applied to a thickness of approximately 15 mm to bury the reinforcing wire mesh structure.

After the cement mortar has hardened, the formed hull can be easily removed from the formwork 11, and the outer surface of the hull is coated with hard resin 13 so that it is smooth, clean, and scratch-resistant, and staples 18 can be removed. The tip of the hull was not protruded or polished at all, and an excellent fluorocement shot hull was obtained.
Example 2 Figures 3 and 4 show that the width and height are 66, respectively, due to the manufacturing method of this invention.
FIG. 7 is a partial cross-sectional view showing another example of a U-shaped groove material having a length of 0 and 2 rudders.

In this example, a molding agent of polyvinyl alcohol is first applied thinly to the inner surface of the iron plate formwork 21 whose inner surface is made to match the outer shape of the U-shaped groove material, and then a hard epoxy resin 23 is applied on top of it. Spray coating to a thickness of 1 to 1.5 mm, and reduce the wire diameter to 0.5 mm before the hard epoxy resin 23 hardens.
On the side, a crimp wire mesh 24 with a 5×5 elevation mesh is placed on this hard epoxy resin layer 23, and then this wire mesh 2
4 was pressed with a round twill A having a diameter of about 1 inch at intervals of about 10 arcs as shown in FIG. . By fixing the wire mesh 24 to the hard resin layer 23 in this manner, it was used as a staple trapping layer in place of the soft resin layer in Example 1 above. After this, this crimp wire mesh 2
A wire mesh 25 of 22 electric wires having a mesh of 10×1 anti-elevation angle is placed on top of 4 in two layers, and a soft iron bar 2 with a diameter of 5 is placed on top of that.
6 are placed as reinforcing bars with a spacing of about 1 ratio, and on top of that, two layers of wire mesh 27, which is the same as the wire mesh 25, are placed, and then the soft iron bars 26 are held down with a cross section of 0.7 x 1. Outboard, needle length 2
Crimp the staples 28 on the 5th side at approximately 20° intervals with the wire mesh 2.
4 and the hard resin layer 23, the staple 28 does not penetrate the hard resin layer 23, but expands with its tip bent into the layer of the crimp wire mesh 24, as shown in FIG. The soft iron bar 26 could be fixed to the crimp wire mesh 24.

Next, cement mortar 29 is sprayed onto this to a thickness of approximately 15 mm so that the wire meshes 25, 27 and soft iron rods 26 are buried, and after the cement mortar 29 has hardened, it is formed from the formwork 21. The U-shaped groove material could be easily removed, and a smooth and clean U-shaped groove material was obtained in which the tip of the staple did not protrude or be exposed and the outer surface was coated with a hard resin layer. Also, in this example, the soft resin layer was not provided on the hard resin layer, but if necessary, the soft resin layer may be applied on the hard resin layer and the crimped wire mesh may be crimped before it hardens. Of course, you can do it as you see fit.

Example 3 Figures 5 and 6 are partial cross-sectional views showing an example of manufacturing a U-shaped groove material similar to Example 3 using the manufacturing method of the present invention. Apply a vinyl alcohol mold release agent and apply 1 layer of hard epoxy resin 23 on top.
The spray coating is applied to a thickness of ~1.5 mm, and before it hardens, a 1.5 mm thick polyurethane sheet 34 is placed on top of this hard resin layer 33 and cured, and then this polyurethane sheet 34 is The upper surface is covered with two layers of wire mesh 35 with a mesh size of 10×1 broadside angle, and on top of that, European iron rods 36 with a diameter of 5 mm are placed at intervals of about 10 mm, and on top of that, the same wire mesh 37 as before is covered with two layers. After that, the cross section 0.7 is
×1. If you drive in a staple 38 with a needle length of 25 and skin on the stern,
The tips of the staples 38 were bent and expanded into the polyurethane sheet 34 without penetrating the hard resin layer 33, and were able to fix the soft iron rod 36 and the wire meshes 35, 37.

Next, cement mortar 39 was spray-painted on top of this to a thickness of approximately 15 mm so that the soft iron rods 36 and wire meshes 35 and 37 were buried therein, and after the cement mortar 39 had hardened, it was poured out of the formwork 31. When the U-shaped groove material was removed, a U-shaped groove material with a smooth hard resin layer surface without protruding staple tips was obtained. Moreover, glass fiber or synthetic resin fiber can also be used instead of the polyurethane sheet in this example. Example 4 Figures 7 to 9 show another example of the manufacturing method of the present invention, the only difference being that a barbed wire is used in place of the staple in the above example. ing.

First, a mold release agent is applied to the inner surface of the required formwork 41 in the same manner as used in the previous example, and a hard epoxy resin 43 is applied on top of this.
is spray coated to a thickness of about 1 to 1.5 ribs, and before the hard epoxy resin 43 has hardened, two barbed wires 48 as shown in FIG. ′ is partially embedded. This barbed wire 48 is made of wire with a diameter of 1 mm for both the barbs and the wire body, and the length of the barb 48' in the diametrical direction is about 30 mm, and the spacing between the barbs is 1 ratio. Hard epoxy resin 43
After hardening and fixing the barbed wire 48, 10×IQ
Two layers of wire mesh 45 at the gunwale are placed on top of each other, soft iron rods 46 with a diameter of 5 willow are placed at intervals of about 10 rods, and two layers of wire mesh 47, which is the same as the wire mesh 45, are placed on top of this. After that, attach the remaining protruding barbs 48' of the barbed wire 48 to the wire mesh 4.
The soft iron rod 46 and the wire mesh 45, 47 are fixed by bending them at the upper surface of 7, and a second layer of hard resin is made by spraying hard epoxy resin again. The soft reinforcing bars 46 and wire meshes 45 and 47 were buried using kite spray painting, and after the cement mortar 49 had hardened, the molded U-shaped groove material was removed from the formwork 41 to create a U-shaped groove whose surface was coated with a hard resin with a smooth surface. The wood was tied up. In addition, as a modification of this example, a hard resin layer and a primary layer of barbed wire are made on a flat board, then this is removed from the board, fitted to the required formwork, wire mesh and reinforcing bars are placed, and cement mortar is placed. Ferrocement products can also be made by spray painting. As described above, according to the manufacturing method of the present invention, the surface is covered with a hard resin, and the tips of the staples do not protrude or expose.Therefore, there is no need to cut off the tips of the staples, or there is no need to worry about rust, and there is no need to worry about rust. ferrocement products are obtained. BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a partial cross-sectional view of the production of ferrocement products according to the manufacturing method of the present invention,
The figure is a similar partial sectional view when manufacturing a yacht hull by the manufacturing method of this invention, Figures 3 and 4 are similar partial sectional views in another example of the manufacturing method of this invention, and Figures 5 and 6 are other examples. 7 and 8 are similar partial sectional views of still another example, and FIG. 9 is a perspective view of the barbed wire used in the example of FIGS. 7 and 8. It is.

In the figure, 1, 11, 21, 31, 41: formwork, 3, 13,
23, 33, 44: Hard resin, 4, 14, 34: Soft resin, 5, 7, 15, 17, 25, 27, 35, 37, 4
5, 47: Wire mesh, 6, 16, 26, 36, 46: Soft iron bar, 8, 18, 28, 38: Staple, 9, 19, 29
, 39, 49: cement mortar, 24: crimp wire mesh, 34: polyurethane sheet, 48: barbed wire. 1st
Figure 2 Figure 9 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8

Claims (1)

[Scope of Claims] 1. A layer of hard resin is formed on the surface of the mold coated with a mold release agent, and a binding needle trapping layer made of a material softer than the hard resin is provided on top of the hard resin layer. A wire mesh is placed on top, reinforcing reinforcing bars are placed at the required intervals, another wire mesh is placed on top of that, these wire mesh reinforcing structures are then fixed with binding needles, and mortar cement is applied to this. A method of manufacturing ferrocement products by coating. 2. The method for producing a ferrocement product according to claim 1, wherein the binding needle trapping layer is made of a soft resin layer. 3. The method for producing a ferrocement product according to claim 1, wherein the binding needle trapping layer is made of a crimp wire mesh. 4. The method for producing a ferrocement product according to claim 1, wherein the binding needle trapping layer is made of a polyurethane sheet. 5. The method for producing a ferrocement product according to any one of claims 1 to 4, wherein the binding needle is a staple. 6. The method for producing a ferrocement product according to claim 1, wherein the binding needle is a barbed wire.