JPH0938933A - Concrete form - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a repeatedly reusable concrete form capable of forming smooth embossed patterns high in natural feeling on the surface of concrete and excellent in releasability after the casting of concrete. SOLUTION: A concrete form is constituted by providing a form surface plate 21 made of foamed polyethylene having embossed patterns made smooth by surface melting by the spraying of a flame or hot air on the surface thereof on the surface of a form substrate 25.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a concrete formwork.

[0002]

2. Description of the Related Art For example, when a wall is to be cast with concrete, a pair of formwork is set up at a required interval and is erected on a concrete-placement-scheduled surface so that the mold faces face each other. It is done by filling the concrete slurry between the surfaces and removing the mold after hardening.

By the way, recently, various patterns may be required on the surface of the concrete wall. However, the conventional formwork is made of plywood or a metal plate, and it has not been possible to easily and inexpensively form an unevenness for a pattern on the surface thereof. In addition, since concrete tends to adhere to plywood and the like, it is necessary to apply a mold release agent prior to placing concrete. Even by the unevenness,
It becomes easier for concrete to adhere. Therefore, if a mold having an uneven pattern is used once or twice, it cannot be used after that due to the concrete adhered to the surface of the mold and hardened, and it must be discarded, resulting in an expensive mold. .

Further, on a concrete wall or the like, boulders,
A smooth uneven pattern close to nature, such as gravel, may be required. However, in a mold made of plywood or the like, it was not easy to form a smooth uneven surface such that a concrete wall has a smooth uneven pattern on the surface such as cobblestone.

[0005] A mold having an uneven pattern formed by shaving the surface of styrofoam by engraving or the like has also been proposed. In that case, however, it is difficult to obtain an uneven pattern having a smooth surface, and uneven uneven parts are also formed. Therefore, there is a problem that the concrete slurry is likely to be insufficiently filled, or that the polystyrene foam is inferior in impact strength and thus requires careful handling. Furthermore, it has been proposed to finish the surface with paper after scraping the surface with the above engraving, but there is a limit to the paper finishing, and it is especially difficult to give a smooth texture like natural boulders. It was difficult. Moreover, it takes a lot of labor and time to finish the surface of a large formwork used for construction of a wall or the like with paper.

[0006] Further, as the mold frame, one piece having a predetermined size made of plywood or the like is usually used, but since it is heavy, it requires a great deal of labor for its preparation, assembly, removal, transportation, etc. There was also the problem of taking up space when storing the formwork.

[0007]

SUMMARY OF THE INVENTION The present invention has been made to solve all of the problems described above, and it is possible to form a concavo-convex pattern having a natural texture on the surface of concrete, and to separate the concrete when placing it. It is an object of the present invention to provide a concrete formwork that does not require a molding agent, has sufficient strength, and can be reused repeatedly.

[0008]

That is, the present invention provides:
A concrete formwork in which a formwork surface plate made of expanded polyethylene having an uneven pattern smoothed by surface melting by blowing flame or hot air on the surface of a form base is provided.

The smooth uneven pattern is preferably formed by cutting the surface of a foamed polyethylene plate to form an uneven cutting surface, and then blowing flame or hot air onto the uneven cutting surface to melt the uneven cutting surface. By doing so, a desired uneven pattern can be quickly formed.

Further, the formwork is a formwork main body in which a formwork surface plate is fixed to the surface of a regular octagonal formwork base body in which the outer periphery of a regular octagonal base plate is surrounded by a peripheral side plate having clip insertion holes. A mold surface plate is provided on the surface of a square mold base body in which the outer periphery of a square base plate having a side equal in length to one side of the base plate of the mold body is surrounded by a peripheral side plate having a clip insertion hole. It is preferable that a series of formwork surfaces are formed by connecting the required number of the formwork bodies and the formwork connection bodies, each of which is composed of a fixedly connected rectangular formwork connection body. In this way, the mold can be disassembled into small pieces for storage and transportation, which is extremely convenient. Furthermore, by connecting a desired number of the regular octagonal mold bodies and the regular quadrangle mold connection body, a mold without a gap between the regular octagonal mold bodies can be easily obtained.

Further, it is preferable to form a hole for inserting the mold clamping device in either or both of the mold main body and the connection body. This facilitates the installation of the form clamping device.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the accompanying drawings. FIG. 1 is a perspective view of a mold body or the like constituting a concrete mold according to an example of the present invention, and FIG. 2 is a cross-sectional view showing stepwise a step of forming a smooth uneven pattern on a mold surface plate. 3 is a perspective view showing the front surface side of the mold base,
4 is a perspective view showing the back side of the mold base, FIG. 5 is a rear view showing the molds in a combined and combined state, FIG. 6 is an enlarged rear view showing the connecting parts of the mold bases, and FIG. 7 is clamping the molds. FIG. 8 is a perspective view showing the apparatus, FIG. 8 is a rear view showing another example of the formwork connecting body, FIG. 9 is a rear view showing another formwork connecting body, and FIG. 10 is concrete using the concrete formwork of the present invention. It is sectional drawing which shows the time of driving the wall.

A concrete formwork 10 according to an embodiment of the present invention shown in FIG. 1 is a regular octagonal formwork body 20.
It is possible to disassemble the square formwork connector 30 and the triangular formwork connector 50, and the disassembly enables efficient storage, transportation, and assembly.

The regular octagonal mold body 20 is the center of the mold, and a mold surface plate 21 is bonded to the surface of the mold base 25. As is well understood from FIG. 2C, this formwork surface plate 21 has a smooth uneven pattern 22 on the surface.
And a rear surface 21b thereof is a thin plate that forms an attachment surface 23 to a frame body 25 described later.

The material of the mold surface plate 21 is foamed polyethylene. This foamed polyethylene is excellent not only in workability but also in mold releasability from concrete, and has the property of not being deteriorated by hydrolysis, and is therefore suitable as a surface material of a mold. As the foamed polyethylene used,
A cross-linking type having an expansion ratio of 2 to 50 is preferable. In this example, PE light H-2000 (manufactured by Inoac Corporation) was used as the foamed polyethylene.

The back surface 21b of the mold surface plate 21 is adhered to a mold base 25 described later with an adhesive, and the surface 21a forms the mold surface 11 of the mold 10, as shown in FIG.
As the adhesive for adhering the mold surface plate 21 to the mold base 25, a polyethylene-based adhesive is preferable in consideration of the adhesiveness with the foamed polyethylene forming the mold surface plate 21. . In this example, Inoac Bond P
E 106B (manufactured by Inoac Corporation) was used.

The smooth concavo-convex pattern of the mold surface plate 21 is for forming a concavo-convex pattern having a high natural texture on the surface of the concrete to be cast, and is formed as follows. First, as shown in FIG. 2 (A), the surface of a foamed polyethylene plate P having a predetermined thickness (40 to 100 mm in this embodiment) is cut by a cutting machine, a knife or the like to obtain an uneven cut surface having a desired shape. Form Pa. The unevenness of the uneven cutting surface Pa is determined according to the final uneven shape.

Next, as shown in FIG. 2B, a flame F such as a burner is directly applied to the uneven cutting surface Pa, or hot air such as a hot air heater is blown to the uneven cutting surface Pa.
Is melted to form a smooth uneven pattern 22 as shown in FIG. After that, punching is performed according to the shape of the mold base described later to obtain a desired mold surface plate 21. In the case of flame F, the melting of the uneven cutting surface Pa is 200 ° C. to 30 ° C.
It is preferably about 0 ° C, and about 600 to 700 ° C in the case of hot air.

The uneven pattern 22 obtained by this melting has a very smooth surface and is excellent in design, and in particular, a natural cobblestone pattern can be easily created. In addition, due to the synergistic effect of the smoothness and the releasability of the foamed polyethylene, it is difficult for concrete to adhere to the mold surface plate 21 during concrete pouring, and the mold can be smoothly released, enabling repeated reuse. Is. In this example, it was possible to repeatedly use the material 100 times or more.

On the other hand, the mold base 25 constitutes the basic shape of the mold and, as shown in FIGS. 3 and 4, is composed of a regular octagonal substrate 26 and a peripheral side plate 27 surrounding the outer periphery thereof. The regular octagonal substrate 26 is made of FRP, metal, plywood or the like, and the surface 26a thereof is the mold surface plate 21.
On the other hand, the peripheral side plate 27 is erected on the outer periphery of the back surface 26b by adhesion or the like.

The peripheral side plate 27 is provided with a predetermined number of clip insertion holes 28, which are used for connection with other mold bodies or mold connectors, at positions corresponding to the sides of the mold base 25. In addition, a reinforcing plate 29 may be provided on the back surface 26b of the substrate 26 for the purpose of increasing its rigidity. The peripheral side plate 27 and the reinforcing plate 29 are made of metal, wood, or the like. In this example, the size of the regular octagonal mold base 25 is
Length of one side is 310 mm, length between opposite sides is 750
mm is used.

As can be seen from FIG. 5, the square-shaped formwork connecting body 30 is formed by connecting the regular octagonal formwork body 20 to the formwork body 4.
It is used to fill the square space generated when the bodies are combined and to connect the form body 20. The square-shaped formwork connector 30 has a structure in which a formwork surface plate 31 formed in the same manner as described above is bonded to the surface of a square-shaped formwork base 35.

In this case, the mold base 35 is inserted into the outer periphery of the back surface 36b of a regular square substrate 36 having a side equal to one side of the regular octagonal substrate 25 of the main mold body 20 in the same clip as described above. A peripheral side plate 37 having holes 38 is erected. The back surface 36b of the substrate 36 is shown in FIG.
As is well understood from the above, the insertion hole 39 for mounting the form clamping device 100 is formed as a tubular body 40 having an L-shaped fissure 41. In addition, a reinforcing plate 42 may be provided on the back surface 36b of the substrate for the purpose of increasing rigidity. In addition, the square-shaped frame connecting body 3 of this example
0 has a side length of 310 mm. Further, the insertion hole 39 for the mold clamping device may be provided in the mold body 20.

Furthermore, a triangular formwork connector 50 is used if necessary. As is well understood from FIG. 5, this triangular formwork connector 50 connects two formwork bodies 20 juxtaposed at the ends of the formwork. This triangular formwork connector 50 has a structure in which the same formwork surface plate 51 as described above is bonded to the surface of a triangular formwork base 55.

The mold base 55 is formed on the outer periphery of the back surface 56b of a substrate 56 which is an isosceles right triangle having two sides having a length equal to one side of the regular octagonal substrate 25 of the mold body 20 as two sides sandwiching a right angle. A peripheral side plate 57 having a clip insertion hole similar to the above is erected. Also, the substrate 5
A hole 58 having the same structure as the insertion hole 39 for the mold clamping device of the regular square mold connector 30 is provided on the back surface 56b of No. 6 as described above. Further, a reinforcing plate 59 may be disposed on the back surface 56b of the substrate for the purpose of increasing rigidity. The triangular formwork connector 50 is not always used, and is unnecessary when the periphery of the formwork may be an uneven shape due to the outer periphery of the formwork body 20.

Further, as another formwork connector used as required, there is a half-triangular formwork connector 60 having a shape obtained by halving the triangular formwork connector 50. As is best understood from FIG. 5, the half triangle formwork connector 60 is connected to the regular octagonal formwork body 20 at the corner of the formwork 10, and is different from other formwork connectors. Similarly, it is composed of a mold surface plate 61 and a mold base 65. Code 6
6 is a clip insertion hole.

Further, in order to make the mold 10 into a desired size and shape, a two-divided octagonal mold body 70 shown in FIG. 8 or a four-divided octagonal mold body 80 shown in FIG. 9 can be used.
The two-divided octagonal mold body 70 has a shape obtained by dividing the regular octagonal mold body 20 at opposite sides, while the four-divided octagonal mold body 80 includes the substrate 26 of the regular octagonal mold body 20. Is divided into four parts at the sides, and each has the same structure as that of the mold body 20. Reference numerals 76 and 86 denote substrates, 77 and 87 denote peripheral side plates having clip insertion holes, 7
Reference numerals 8 and 88 are reinforcing plates.

Next, a description will be given of the work of forming the mold 10 by combining the mold body 20 and the mold connector 30 ..., and the concrete pouring using the mold 10. First, as shown in FIG. 1, a required number of the mold body 20 and the mold connection bodies 30, 50, 60 are combined with the mold surface plates 21, 31, 51, 61 on the same side,
As shown in FIG. 6, the clips 90 are inserted into the clip insertion holes (28 and 38 in this example) formed in the peripheral side plates to be connected. Thereby, a mold having a series of mold surfaces is formed. In this embodiment, a clip is used to connect the mold body and the like, but other connecting members such as bolts and nuts may be used.

Concrete is cast using the concrete formwork formed by connecting in this way.
First, as shown in FIG. 10 (A), the concrete forms 10 (10A) and 10 (10B) forming a pair are separated by a required distance so that the form faces 11A and 11B made of the form face plates face each other. It stands upright and is fixed by the form clamp device 100.

In the present embodiment, the mold clamping device 100 includes a washer 110 and a separator 120 as shown in FIG.
And a connecting rod member 130 and a wedge 140. The washer 11
0 is a columnar body 111 having disk portions 112 and 113 provided at one end and the center thereof, and a locking pin 114 protrudingly provided at the other end thereof. A reinforcing plate 115 is provided between the disk portions 112 and 113. It is provided. Insertion holes 112a and 113a for inserting the separator 120 are formed at corresponding positions of the disk portions 112 and 113.

The separator 120 is formed of a rod-shaped body having male threads formed on both ends, and the male thread is connected to the connecting rod member 13.
0 is screwed. The connecting rod member 130 is formed at one end with a female screw that is screwed into the male screw of the separator 120.
A long hole 131 for inserting the wedge 140 is formed in the central portion. The wedge 140 is inserted through the long hole 131 of the connecting rod member, and a locking pin 141 is provided at the end thereof.

Form clamping device 100 having the above structure
Is used as follows: First, the pair of concrete molds 10A and 10B are isolated from each other for a required time, and the mold surface 11A is separated.
And 11B face each other.

Then, in the L-shaped fissure 41 of the tubular body 40 forming the insertion hole 39 of the square-shaped frame connector 30,
The lock pin 114 of the washer 110 is inserted and rotated to fix the washer 110 to the regular square formwork connector 30, that is, the concrete formwork 10A. It should be noted that not only the insertion hole 39 of the square frame connection body 30 but also the insertion hole 58 of the triangular frame connection body 50 having the same structure can be used.

Next, connecting rod members 130 are screwed to both ends of the separator 120, and the separator 120 is inserted into the insertion holes 112a, 1a of the washer 110 fixed to the mold 10A.
13a and the square-shaped frame connecting body 30 are inserted into the insertion holes 39, and the elongated hole 131 of the connecting rod member is positioned between the disk portions 112 and 113 of the washer 110. The insertion hole 39 is formed in the mold surface plate 31 of the square mold connector 30.
A hole 34 for the mold clamping device, through which the separator 120 is inserted, is provided at a position corresponding to. This hole 34
When it is no longer necessary or needs to be corrected, it can be easily repaired by filling it with foamed polyethylene crushed material and heating it with a lighter or the like.

Thereafter, the disk portion 112 of the washer 110,
In the long holes 131 located between the 113, the wedge 140
The separator 120 and the connecting rod member 130.
Is fixed to the washer 110. And the separator 12
By fixing another connecting rod member (not shown) at the other end to the concrete form 10B in the same manner,
The concrete forms 10A and 10B are fixed by separating them for a required period.

Next, concrete slurry C is filled between the mold surfaces 11A and 11B of the concrete mold. At this time, since the mold surface 11A or 11B is formed by the mold surface plate 21 having a smooth uneven pattern, the concrete slurry C is easily filled along the surface of the mold surface plate 21, so that the uneven pattern is formed. Insufficient filling of concrete slurry C and voids do not occur in the part. Further, the molds 11A and 11B are the mold tightening device 1
Since it is fixed by No. 00, there is no possibility that the space between the molds 10A and 10B will be widened or the mold 10A or 10B will fall over even by the filling pressure of the concrete slurry C.

The concrete slurry C filled between the mold surfaces 11A and 11B is, as shown in FIG. 10B, the mold surface plate 21 provided on the surface of the mold base 25.
By this, the surface shape is formed and hardened to form a concrete wall having a smooth uneven pattern.

Then, the concrete forms 10A and 10B are removed from the concrete wall. For the work, first, the wedge 140 is pulled out, and the washer 110 is rotated in the direction opposite to that when the washer is fixed to remove it from the mold 10 (10A, 10B).
Further, the connecting rod member 130 is rotated to remove the form clamping device 100. Then, the formwork 10 is removed from the concrete wall. At that time, the surface of the formwork 10 in contact with the concrete
It is composed of a mold surface plate 21 made of expanded polyethylene which is excellent in mold releasability, and the uneven pattern of the mold surface plate 21 is in a very smooth state in which bubbles on the surface are crushed by heat melting. Since the concrete does not adhere to the surface of the mold 10, the mold 10 can be removed extremely smoothly.

The mold 10 thus removed has no concrete adhered to the surface due to its excellent mold releasability.
Moreover, the polyethylene foam forming the mold surface plate 21 is
It can be reused repeatedly because it does not decompose with water due to water in concrete slurry and does not deteriorate, and it has higher strength than expanded polystyrene.
When the removed mold 10 is stored or transported, the clip 90 is removed to remove the mold main body 20.
And the formwork connector 30 is disassembled.

In the above embodiment, the mold which is disassembled into the mold main body and the mold connecting body is described, but the mold of the present invention is not limited to this, that is, the mold which is not disassembled, that is, The mold surface plate may be adhered to the surface of a single mold base having a desired size.

[0041]

As shown and described above, according to the concrete mold of the present invention, the mold surface plate forming the mold surface is made of foamed polyethylene, and the surface is melted by blowing a flame or hot air. Since the surface has an uneven pattern smoothed by, unlike the uneven formation by cutting or the like, it is possible to form an uneven pattern with a high natural texture on the concrete surface without an unnatural step or streak. Moreover, since the foamed polyethylene forming the mold surface plate is excellent in workability, the uneven pattern can be easily formed, and the desired uneven pattern can be easily formed. Further, a smooth concave-convex pattern can be formed more efficiently by forming an uneven cutting surface on the surface of the foamed polyethylene plate serving as the mold surface plate and then blowing the flame or hot air.

The foamed polyethylene forming the mold surface plate is excellent in mold releasability from concrete, and the uneven pattern of the mold surface plate has its surface smoothed by melting. Concrete does not easily adhere to the frame, and releasability is extremely good. Moreover, in addition to the good mold releasability, the mold of the present invention is such that the foamed polyethylene forming the mold surface plate does not deteriorate due to decomposition with superhydrolysis, and the impact absorbency and strength are foamed polystyrene. It is very economical because it is more expensive and easy to handle and can be reused repeatedly.

[Brief description of drawings]

FIG. 1 is a perspective view of a mold body or the like that constitutes a concrete mold according to an example of the present invention.

FIG. 2 is a cross-sectional view showing step by step a step of forming a smooth uneven pattern on the surface of a mold surface plate.

FIG. 3 is a perspective view showing a front surface side of a mold base.

FIG. 4 is a perspective view showing a rear surface side of the mold base.

FIG. 5 is a rear view of the formwork showing a combined state of the formwork bodies and the like.

FIG. 6 is an enlarged rear view showing a connecting portion between the mold body and the mold connection body.

FIG. 7 is a perspective view showing a mold clamping device.

FIG. 8 is a rear view showing another formwork connector.

FIG. 9 is a rear view showing still another formwork connecting body.

FIG. 10 is a cross-sectional view showing when a concrete wall is cast using the concrete formwork of the present invention.

[Explanation of symbols]

 10: Concrete formwork 20: Formwork body 21: Formwork surface plate 25: Formwork base 26: Substrate 27: Peripheral side plate 28: Clip insertion hole 30: Regular square formwork connection body 50: Triangular formwork connection Body 39, 58: Hole for inserting formwork tightening device

Claims (4)

[Claims] 1. A concrete formwork in which a formwork surface plate made of expanded polyethylene having an uneven pattern smoothed by surface melting by blowing of flame or hot air on the surface of a formwork base is provided. 2. The smooth concavo-convex pattern according to claim 1, wherein the surface of the expanded polyethylene plate is cut to form a concavo-convex cutting surface, and then flame or hot air is blown onto the concavo-convex cutting surface to melt the concavo-convex cutting surface. Concrete formwork characterized by 3. The formwork main body according to claim 1, wherein the outer periphery of the regular octagonal substrate is surrounded by a peripheral side plate having a clip insertion hole, and a formwork surface plate is fixed to the surface of the regular octagonal formwork base. A mold surface plate is formed on the surface of a square base of a square base which is surrounded by a peripheral side plate having a clip insertion hole, the outer periphery of the square base having a side equal in length to one side of the base plate of the main frame body. A concrete formwork, comprising a fixed formwork connection body of a quadrangle, wherein a predetermined number of the formwork body and the formwork connection body are connected and combined to form a series of formwork surfaces. 4. The concrete formwork according to claim 3, wherein a hole for inserting a formwork tightening device is formed in either or both of the formwork body and the formwork connection body.