JPH04127354U - concrete formwork panel - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a panel for concrete formwork that makes it difficult for the reinforcing fibers to be anchored to the poured concrete layer even if the panel contains reinforcing fibers such as single glass fibers in the synthetic resin layer. . [Structure] A net 2 is laminated and integrated on a mold surface 11 of a panel body 1 made of synthetic resin containing reinforcing fibers. The reinforcing fibers of the panel body 1 are held down by the net 2, making it difficult to protrude from the mold surface 11, and making it difficult to be anchored to the poured concrete layer.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention is a concrete material that is needed when pouring concrete at construction sites, etc. It relates to panels used as formwork.

0002

[Conventional technology]

Conventionally, plywood panels were commonly used as panels for concrete formwork, but Recently, as seen in Utility Model Application Publication No. 58-156839, synthetic resin parts have been developed. Attempts have been made to use flannel as concrete formwork. And synthetic resin When using panels for concrete formwork, surface abrasion due to repeated use In order to suppress damage, prevent damage during handling, and prevent warping during use, Rust fibers may be included in the synthetic resin layer of the panel to strengthen it.

0003 However, panels reinforced by incorporating glass fiber into the synthetic resin layer are not made of glass. The fibers are exposed on the panel surface and may come into contact with your skin when carrying the panel. This includes the problem that it becomes difficult to use.

0004 In addition, the above panel is the same as the panel used as formwork after concrete pouring. A situation occurs where it is difficult to peel off when removing it, which reduces work efficiency. There is. This makes it difficult for the panel to peel off from the concrete layer. Because the glass fibers exposed on the surface of the concrete layer are anchored to the concrete layer. It is thought that it is.

[0005] In addition, if the above panels are used repeatedly as concrete formwork, the surface of the panel As the number of times it is used increases, the surface gradually becomes rougher. This concrete panel When peeled from the layer, the glass fibers anchored to the concrete layer are removed from the concrete layer. This is thought to be because it remains on the REET layer side and is peeled off from the panel. and If the mold surface of the panel becomes rough, this will worsen the peelability from the concrete layer. It leads to things.

[0006]

[Problem that the idea aims to solve]

This invention was devised in view of the above problems, and the synthetic resin layer is made of glass fiber, etc. Even for panels that contain reinforcing fibers, the reinforcing fibers are anchored to the poured concrete layer. The purpose is to provide panels for concrete formwork that are less susceptible to corrosion. .

[0007]

[Means to solve the problem]

The concrete formwork panels of this invention are made of synthetic materials containing reinforcing fibers such as glass fibers. A surface covering material made of net etc. is laminated on the mold surface of the resin panel body. It is.

[0008]

[Effect]

According to the present invention, reinforcing fibers such as glass fibers contained in the synthetic resin layer of the panel body The fibers are held down by the surface covering material laminated on the mold surface of the panel body, and the cast concrete It becomes difficult to be anchored to the REIT layer. Also, even if the concrete layer is reinforced Even if the fibers are anchored, when peeling the panel from the concrete layer The reinforcing fibers that were anchored to the concrete layer are also peeled off from the concrete layer.

[0009]

【Example】

The concrete formwork panel P according to the embodiment of FIG. 1 is made of synthetic wood containing glass fiber. A surface covering material 2 made of net is laminated and integrated on the mold surface 11 of the panel body 1 made of fat. There is.

0010 The panel body 1 is made of fiber reinforced plastic proposed in Japanese Patent Application Laid-open No. 60-158227. It has a composition similar to a plastic structure. Also contains glass fiber The manufacturing method of the panel body 1 is based on the manufacturing method disclosed in the same publication. i.e. panel book The synthetic resin layer of the body 1 contains glass single fibers throughout, and the granular heat A foamed product with dispersed microbubbles made by mixing plastic resin, single glass fibers, foaming agent, and water. A dispersion is prepared, and the foamed dispersion is passed through a mesh, etc. in the same way as papermaking, which is done in the paper manufacturing field. After drying, the resulting sheet is dehydrated and heated on a porous support. This solidifies to obtain a non-breathable sheet body, and this non-breathable sheet body is reheated to produce e.g. As shown in Japanese Patent Application Laid-open No. 179233/1983, a mold consisting of a lower mold and an upper mold Stamping is performed by laminating the required number of sheets inside and pressing them. manufactured by Then, the stamping molding is performed using a needle used as the surface covering material 2. This is done after placing the cut on one or both sides of the mold. In this way, At the same time as the panel body 1 is formed, the warp and weft threads of the net are embedded in the mold surface of the panel body 1. Laminated and integrated into one piece.

[0011] Figure 2 shows the laminated state of the panel body 1 and the net used for the surface covering material 2. There are various embodiments as illustrated in , FIGS. 3 and 4. Figure 2 shows the warp or weft of the net. Approximately half the diameter of the thread (hereinafter referred to as thread 21) is the surface of the panel body 1 on the mold surface 11 side. The state in which the yarn 21 is embedded in the layer part, FIG. 3 shows that almost the entire thread 21 is embedded in the surface layer part. In the state shown in FIG. 4, less than half the diameter of the thread 21 is embedded in the surface layer. The status is shown respectively. Among these embodiments, the embodiment in Fig. 3 is stamping. It is formed when the mold clamping pressure during molding is increased, and the embodiment shown in Figure 4 increases the mold clamping pressure. The pattern shown in Figure 2 is formed when the mold clamping pressure is set to a medium level. It will be done. The bonding force between the panel body 1 and the net is weaker in the order of Fig. 3, Fig. 2, and Fig. 4. Therefore, the smoothness of the mold surface 11 of the panel body 1 decreases in the order of FIGS. 3, 2, and 4. death Therefore, when actually used as concrete formwork, the requirements for poured concrete are Either one can be used depending on the smoothness of the skin surface. However, the situation in Figure 4 The width of the threads 21 protruding from the mold surface 11 of the panel body 1 is large, and the width of the threads 21 is large. Since the bonding force between the flannel body 1 and the net is not so large, the thread 21 is Is the concrete layer anchored to the concrete layer in which the panel P is placed? There is a possibility that the thread 21 remains on the concrete layer when it is peeled off. . Therefore, the embodiments shown in FIGS. 2 and 3 are desirable.

0012 During the above stamping process, tighten the upper and lower molds to apply the surface covering material 2 to the panel. If the upper mold and lower mold are separated by a certain length after being laminated and integrated with the main body 1, the internal gas will be removed. The panel body 1 expands due to the restoring force of the lath fibers GF, and the surface is exposed on the porous panel body 1. The surface covering material 2 is laminated.

[0013] In this way, the surface covering material 2 made of net is laminated and integrated on the mold surface 11 of the panel body 1. As shown in FIG. 2, the synthetic resin layer of the panel body 1 contains The glass single fibers GF are held down by the net threads 21 and protrude from the mold surface 11, causing fuzz. The situation of standing up is suppressed. Therefore, when used as concrete formwork, There is a situation where glass fiber GF is anchored to the poured concrete layer. suppressed.

[0014] Synthetic resins for forming the panel body 1 include polypropylene (PP) and polypropylene. Ethylene (PE), polyethylene terephthalate (PET), polybutylene terephthalate Thermoplastics such as phthalate (PBT), polycarbonate (PC), and nylon Fat can be used. Among these, PP and PE have extremely low viscosity when melted. Because they have excellent lubricity, they can be used to prevent them from entering the gaps and meshes of the surface coating material 2. It is easy to penetrate and increases the bonding strength between the panel body 1 and the surface covering material 2. The smoothness of the surface of the mold P is improved. The synthetic resin layer of the panel body 1 is made of single glass fibers. In addition, various reinforcing fibers such as carbon fiber, stainless steel fiber, and copper fiber are preferably used. can be done. When using glass single fibers, the thickness is 5 to 20 μm and the length is 7 to 5 μm. It is preferable to use 20 to 60% by weight of 0 mm single fibers, and the remainder to be thermoplastic resin. Ga When glass single fibers are used as reinforcing fibers, glass single fiber panels can be formed by stamping molding. It wraps around the entire body 1 uniformly, and the reinforcing effect and abrasion resistance effect of the glass single fibers are perfect. It has the advantage that it is uniformly distributed throughout the flannel body 1.

[0015] When using the above manufacturing method, if the content of single glass fibers is too low, the panel quality This can easily lead to a lack of strength in the body 1. On the other hand, if the content of single glass fibers is too high, the panel The amount of single glass fibers on the surface layer of the main body 1 becomes excessive, and the net prevents fuzzing. The action reaches its limit and more single glass fibers are exposed on the mold surface of the panel body 1. This causes roughness on the mold surface, making it difficult to obtain a smooth mold surface. Furthermore, the flow of synthetic resin The bond strength between the panel body 1 and the surface covering material 2 also becomes weak. glass monofilament If the length is shorter than 7mm, the reinforcing effect will be weakened, and if it is longer than 50mm, the mixing will not be uniform. It becomes difficult to In addition, sheet bodies that can be suitably used for stamping molding For example, there is KA sheet (product name) manufactured by Capera Sheet Co., Ltd. This is a 2 mm thick sheet containing 60% by weight of PP and 40% by weight of single glass fibers. be.

[0016] In addition, continuous mat is made by spirally winding long glass fibers and laminating them. You can use either.

[0017] The net used for surface covering material 2 can be made of natural fibers such as cotton or pulp, or PE fibers. , the thread 21 is made of chemical fibers such as PP fibers, nylon fibers, and PET fibers. The most desirable material for the thread 21 is the material used for the panel body 1. This is the same type of synthetic resin as the one used in this product. This is made with synthetic resin by stamping molding. When the net is laminated and integrated by heat pressing, a part of the net and the surface layer of the synthetic resin This is because it can be expected that the two will be thermally fused and firmly bonded.

[0018] In addition, when using a net as the surface covering material 2, the mesh of the net may be too large. If the reinforcing fiber length is too short, glass fiber GF etc. can be passed through the mesh of the net. This tends to cause the reinforcing fibers to protrude from the mold surface 11 and become fluffy. Also, If the mesh of the net is too small, the net may be pressed against the mold surface of panel body 1 during stamping molding. When laminating and integrating the net, the synthetic resin layer becomes difficult to penetrate into the mesh of the net. , the nets are likely to be integrated in the manner described in FIG. From this point on the net The size of the mesh and the length of the reinforcing fibers need to be determined in relation to each other. reinforcing fiber When glass single fiber GF is used as fiber, the mesh size of the net is One side of the mesh (if the mesh is square) or the diameter (if the mesh is circular) is a single glass fiber. If the length of the fiber GF is 1/10 to 1/2, the glass fiber G can be passed through the mesh of the net. A situation in which reinforcing fibers such as F protrude from the mold surface 11 and become fluffy is unlikely to occur.

[0019] To confirm this, we used polypropylene resin powder with a diameter of 13 μm and a length of approximately 13 μm. PE net using a sheet mixed with glass fibers of mm and having the mesh shown in Table 1. are laminated and integrated.

[0020]

[Table 1]

[0021] As you can see from this result, the mesh size of the net is 6.4mm, 3.2mm, and 1.6mm. It can be seen that a good surface condition can be maintained if the thickness is mm. This mesh is glass fiber GF They are 1/2, 1/4, and 1/10 of the length of. Therefore, the mesh size is The length of the fiber GF is maintained at 1/10 to 1/2, and the molten resin is contained. It is desirable to set the settings to a level that allows for As the surface covering material 2, net or more is used. Using an external material, such as a synthetic resin film or cloth with many small through holes, It is also possible to

[0022] The panel P shown in Fig. 5 is made by laminating the surface covering material 2 on both the front and back surfaces. be. If the panel P is like this, the glass fiber GF will be exposed from the panel P. Since there are no scratches, it won't itch even if you touch it on the table, making it easier to carry. .

[0023] The panel P explained above can be put to actual use as concrete formwork as it is. However, when combined with the metal reinforcing grid described below, reliability in terms of strength can be improved. will improve.

[0024] As shown in Fig. 6, the reinforcing grid 3 is made of steel such as L-shaped steel and has the same size as the panel P described above. A rectangular outer frame 31 is formed, and the outer frame 31 is made of steel such as L-shaped steel or strip steel. The horizontal bars 32 and vertical bars 33 are framed and fixed in a grid pattern. And figure 7, for example, a through hole 34 is formed in the flange portion 31a of the outer frame 31. , the reinforcing grid 3 is superimposed on the back surface of the panel P, and the reinforcing grid 3 is superimposed on the back surface of the panel P. The boss 13, which has been integrally formed in advance to match the through hole 34, is inserted into the through hole 34. , the boss 13 is heated and crushed into a flat shape to be integrated with the panel P. When L-shaped steel is used for the horizontal bar 32 and the vertical bar 33, these parts are also integrated by the boss 13. You may also perform In addition, in FIG. 7, 35 is a bolt insertion hole.

[0025] By attaching the reinforcing grid 3 to the panel P in this way, bolts, nuts, etc. Now you can use parts that have traditionally been used for connecting concrete formwork as is. This is convenient, and this is a huge advantage in practical use.

[0026] The structure for attaching the reinforcing grid 3 to the panel P is as explained in Fig. 7. but not limited to. For example, as shown in Figure 8, the outer frame 31 of the reinforcing lattice 3 is 33 by an amount corresponding to the thickness of the panel P, and the engaging portion 3 is attached to the protruding portion. 7 is formed into a bulging shape, and an engagement recess 15 is formed on the end surface of the panel P. It is recommended to fit the flannel P into the outer frame 31 and engage the engaging portion 37 with the engaging recess 15. It is also possible to adopt a similar structure.

[0027] FIG. 9 shows the state in which the panel P with the reinforcing grid 3 attached is in use. The same figure 4 is a bolt and 5 is a nut. The bolts 4 are reinforcement bars that are butted against each other. The nut 5 is inserted into the bolt insertion hole 35 formed in the outer frames 31, 31 of the child 3. is screwed into the bolt 4 and tightened. C is the poured concrete layer It is.

[0028]

[Effect of the idea]

According to the present invention, only the peelability of the panel from the concrete layer is improved. First, it has the effect of suppressing roughening of the mold surface of the panel due to repeated use. Ma In addition, when net is used as a surface covering material, the warp and weft of the net can be During molding, it can be laminated and integrated into the synthetic resin layer, making it easy to coat the surface. There is an advantage that the process of laminating and integrating the material and the panel body is simplified.

[Brief explanation of drawings]

FIG. 1 is a schematic perspective view of a concrete formwork panel according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a laminated state of a panel body and a net used as a surface covering material.

FIG. 3 is an explanatory diagram showing another aspect of the laminated state of the panel body and the net used as the surface covering material.

FIG. 4 is an explanatory diagram showing still another aspect of the laminated state of the panel body and the net used as the surface covering material.

FIG. 5 is a sectional view of a concrete formwork panel according to another embodiment of the present invention.

FIG. 6 is a plan view of a panel with a reinforcing grid attached.

FIG. 7 is a partially enlarged sectional view of a panel with a reinforcing grid attached.

FIG. 8 is a partially enlarged sectional view of a panel to which a reinforcing grid according to a modified example is attached.

FIG. 9 is a partial cross-sectional view showing the state in which the panel with the reinforcing grid attached is in use.

[Explanation of symbols]

1 Panel body 2 Surface coating layer 11 Mold surface GF glass fiber P Panel for concrete formwork

Claims (1)

[Scope of utility model registration request] 1. A panel for concrete formwork, characterized in that a surface covering material such as a net is laminated on the mold surface of a panel body made of a synthetic resin containing reinforcing fibers such as glass fibers.