JPH0872030A - Manufacture of forming plate for building retaining wall - Google Patents

Abstract

PURPOSE: To provide a manufacturing method of the forming plates for building a retaining wall, by which the retaining wall is reinforced so much as to allow to backfill before the curing of concrete and, in addition, fine exterior appearance is shown. CONSTITUTION: In the manufacturing method of forming plates 20, which form a concrete filling space for building a retaining wall and, at the same time, serve as some part of the retaining wall by being left therewithin after the completion of the retaining wall, concrete is poured in a form 30 formed in the shape of a large diameter cylinder. After that, by rotating the form 30, the concrete is compacted inside the form 30 by centrifugal force.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a molded plate for constructing a retaining wall, and more particularly to a method for manufacturing a molded plate for directly forming a wall surface of a retaining wall without removing it after hardening of concrete.

[0002]

2. Description of the Related Art Conventionally, in the work of constructing a retaining wall, a predetermined concrete filling space is formed by a mold made by assembling a molding plate manufactured in a factory in advance. There is a construction method for placing concrete in a space.
It is disclosed in Japanese Patent No. 138. Further, according to this construction method, since the wall surface of the retaining wall is configured by leaving the front-side mold without being removed, the work of removing the mold can be omitted.

However, the technique disclosed in the above publication is to remove the back formwork on the side against the earth pressure after the concrete is cured. Therefore, the work for removing the back mold is required, and the work is not sufficiently simplified.

Further, since the molding plate of the mold used here is a flat thin plate material having insufficient strength, it cannot withstand earth pressure. Therefore, even if this back formwork is left as it is and the soil is to be backfilled, it is necessary to wait until the cast concrete has set and then backfill it. Then I had to wait for the concrete to finish curing, so I had to interrupt the work.

Alternatively, in recent years, a retaining wall that emphasizes aesthetics has been required due to the social situation of protecting the landscape.

[0006] Therefore, there has been a demand for a molded plate for retaining wall construction that is strengthened to such an extent that it can be backfilled without waiting for curing of concrete, or in addition to this, it has a beautiful appearance. And
There has been a demand for a method for manufacturing a molded plate that constitutes such a retaining wall.

An object of the present invention is to provide a method of manufacturing a molded plate for retaining wall construction which is strengthened to such an extent that it can be backfilled without waiting for the curing of concrete, or additionally has a beautiful appearance.

[0008]

In order to achieve the above object, the invention according to claim 1 forms a concrete filling space for constructing a retaining wall and leaves the retaining wall after completion. In the method for manufacturing a part-forming plate, the method includes the steps of injecting concrete into a large-diameter cylindrical formwork, rotating the formwork, and compacting the concrete inside the formwork by centrifugal force. It is characterized by

According to a second aspect of the present invention, in the method for producing a forming plate for constructing a retaining wall according to the first aspect, after forming a large-diameter concrete pipe by the step, the concrete pipe is formed into a size of the forming plate. It is characterized by including a step of cutting into.

According to a third aspect of the present invention, in the method for manufacturing a molded plate for constructing a retaining wall according to the first aspect, the mold has a partition plate inside, and the poured concrete is filled with the partition plate. It is characterized in that it is divided into the size of the forming plate.

According to a fourth aspect of the present invention, there is provided a method for manufacturing a retaining plate for forming a retaining wall according to any one of the first to third aspects, wherein the inner surface of the mold is in the vicinity of the rotation axis direction. A PC steel wire is provided, a tensile force is applied to the PC steel wire, and after the poured concrete is hardened, the tensile force of the PC steel wire is released. By adhering to, the tensile force applied to the PC steel wire is transmitted to the concrete and prestressed.

According to a fifth aspect of the present invention, in the method for producing a retaining wall construction molding plate according to any one of the first to fourth aspects, the formwork is provided with a surface defining member on the inside. It is characterized in that one surface of the molding plate is formed so as to correspond to the surface shape of the surface regulating member.

According to a sixth aspect of the present invention, in the method of manufacturing a retaining wall construction forming plate according to any one of the first to fifth aspects, the surface of the forming plate forming the wall surface of the retaining wall is colored. It is characterized by including a coloring step of applying.

According to a seventh aspect of the present invention, in the method of manufacturing a retaining wall construction molded plate according to the sixth aspect, the coloring step includes:
A first step of injecting pre-colored concrete into the mold to form a colored layer, and a second step of injecting uncolored concrete after curing the concrete of the colored layer to form an uncolored layer And are included.

[0015]

In summary, the invention of claim 1 is to produce a forming plate by the concrete centrifugal forming method, that is, to inject concrete into the inside of a cylindrical form,
By rotating this formwork, concrete is compacted.

Specifically, as in the invention described in claim 2, after forming a large-diameter concrete pipe, this is cut into the size of a molding plate, or as in the invention described in claim 3. In addition, a partition plate is provided inside the mold in advance so that the poured concrete is partitioned into the size of the molding plate by the partition plate.

Since the molded plate thus manufactured has a curved shape because the form frame is cylindrical, when the curved convex surface is oriented vertically to form a concrete filling space, this molded plate is Since the outer side surface is convex, an arch action that relieves the stress generated by the pressure from the outside acts, and sufficient strength is achieved. And even if the soil is backfilled before the concrete hardens, the strength of the forming plate is great, so it can resist the earth pressure,
It will function as a retaining wall. Further, if the wall surface of the retaining wall is formed by leaving the molding plate on the side opposite to this without removing it, the work of removing the molding plate can be omitted.

According to the invention of claim 4, a PC
Since the tensile force is applied by the steel wire, it is possible to manufacture a molded plate that is unlikely to crack when concrete is hardened.

Next, according to the invention of claim 5, the surface defining member is provided inside the mold. Therefore,
In the molded plate manufactured by this mold, the inner surface is a curved surface, but the outer surface has a shape corresponding to the surface shape of the surface regulating member.

For example, if the surface of the surface regulating member is made flat, the outer surface of the molding plate becomes flat, and if an uneven pattern is formed on the surface of the surface regulating member, the outer surface of the molding plate becomes uneven. It becomes a pattern. By installing the surface defined by the surface defining member so as to be the wall surface of the retaining wall, a beautiful retaining wall surface can be formed.

In particular, when the surface forming the wall surface of the retaining wall is colored as in the sixth aspect of the invention, the retaining wall has a more beautiful appearance.

The coloring step can be a simple step if the colored layer is formed of pre-colored concrete as in the invention of claim 7. If only the outer layer of the molded plate is used as the colored layer and the inner side is made of uncolored concrete, the cost increase due to coloring can be minimized.

[0023]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a side view showing a formwork for constructing a retaining wall constructed by using a molding plate manufactured by the manufacturing method according to the present invention. The manufacturing method according to the present invention will be described later.

In the figure, the retaining wall form 10 has a pair of molding plates 2 on the outer side of a pair of rebars 12 for assembling which are erected in advance.
0 is arranged, and the molding plates 20 facing each other are connected to each other by the reinforcing bar 14
It is composed by being connected by. Then, concrete is poured into the concrete filling space 16 defined by the pair of molding plates 20 to construct a retaining wall. Then, when the retaining wall is completed, the retaining wall formwork 10
Should be part of the retaining wall without being removed.

Next, the forming plate used in FIG. 1 is shown in FIG. 2, (A) is a front view, (B) is a plan view,
(C) is a side view.

The molding plate 20 is a concrete plate which is curved in one direction as shown in FIG.
When constructing the retaining wall formwork 10, as shown in FIG.
It is lined up with the convex side of the curve facing outward. By doing so, the arched shape acts to relieve the stress caused by the pressure from the outside, and the curved shape increases the strength. Therefore, even if the soil is backfilled before the concrete filled in the concrete filling space 16 is hardened, the forming plate 20 can withstand the earth pressure.

Further, the forming plate 20 has a PC steel wire 2 inside.
Since it has 2, the strength is further increased and cracks are less likely to occur. Specifically, when manufacturing the forming plate 20,
A tensile force is applied to the PC steel wire 22, and after the concrete for manufacturing the forming plate 20 is hardened, the PC steel wire 22 adheres to the concrete, thereby transmitting the tensile force applied to the PC steel wire to the concrete. , Is prestressed.

The forming plate 20 is provided with mesh streaks 24. The mesh streak 24 is formed by bending a plurality of slightly thin rebars so as to draw a rectangular parallelepiped box, a part of which is embedded in the forming plate 20, and the remaining part is formed from the curved concave side surface of the forming plate 20. It stands out. Further, the mesh streaks 24 are provided integrally with concrete while being temporarily fixed to the PC steel wire 22. The mesh line 24 is omitted in FIG.

When the concrete filling space 16 (see FIG. 1) is poured with concrete by providing the mesh streak 24 as described above, the mesh streak 24 is hard to be poured concrete and integrated, and the molding plate 20 is peeled off. It can be prevented.

Further, the molding plate 20 has a mounting member 26 on the curved concave side. The mounting member 26 has a ring portion 26a formed by bending, and when the retaining wall form 10 is formed, the ring portion 2a is formed as shown in FIG.
The end portion of the connecting reinforcing bar 14 is inserted into 6a and hooked. In this way, the molding plate 20 is supported so as not to fall outward. The connecting reinforcing bar 14 may be formed by bending both ends of the reinforcing bar in the same direction. However, a thread is cut on the bent end, and the connecting reinforcing bar 14 is inserted into the ring portion 26a and fixed with a nut. You may

The molding plate 20 according to this embodiment is constructed as described above, and a mold for manufacturing this molding plate 20 will be described next.

FIG. 3 is a perspective view showing a mold used when manufacturing the forming plate. Form 30 for manufacturing this forming plate
Has a cylindrical shape with a bottom as a whole so that concrete can be poured inside, and by rotating it around the central axis and pressing the concrete inward by centrifugal force, the molding plate 20
Is to manufacture.

That is, the molding plate manufacturing mold 30 is a mold for manufacturing the molding plate 20 by the centrifugal molding method.

FIG. 4 shows a cross-sectional view of the forming plate manufacturing frame cut at a right angle to the central axis. Note that FIG. 4 shows a state after the molding plate 20 has been manufactured, and the molding plate 20 is illustrated by omitting the mesh streaks 24 and the fittings 26 (see FIG. 2).

As shown in FIG. 4, a mold 30 for forming a forming plate
Is formed into a cylindrical shape by connecting a plurality of curved mold pieces 32 in the axial direction and the circumferential direction (see FIG. 3). A plurality of flanges are formed on the outside of the curve of each mold piece 32. Specifically, the flange 32a arranged in the central portion of the mold piece 32 is for reinforcement, and the flange 32b formed at the end of the mold piece 32 is a bolt and nut. It is for connecting each other.

Further, on the inside of the curve of the mold piece 32, a flange 32c is formed continuously with the flange 32b. This flange 32c is a mold 3 for forming a molded plate.
This is for partitioning the injected concrete into the size of the molding plate 20 when the concrete is injected into the 0.

As described above, the molding plate 20 is made of P
It has a C steel wire 22, and this PC steel wire 22 is shown in FIG.
It is arranged as shown in. That is, a plurality of end mold pieces 34 are attached to the end of the mold piece 32 in a ring shape, and the PC steel wire 22 can be attached by the end mold pieces 34. In addition, in FIG. 3, about some members, the code | symbol is attached | subjected only to some members.

More specifically, a clamp jig 36 is provided on the end form piece 34, and the PC steel wire 2 to which a tensile force is applied is provided.
It is designed to be clamped and clamped by sandwiching 2. The clamp jig 36 may have any structure as long as it can hold the PC steel wire 22 in a pulled state, and since a known one is specifically used, detailed description thereof will be omitted.

A window portion 34a penetrating from the outer peripheral surface to the inner peripheral surface is formed on the end part mold piece 34, and the PC steel wire 22 is exposed from the window portion 34a to the outside. There is. Therefore, after the compaction of concrete by centrifugal molding and the curing are completed, the PC steel wire 22 is applied from the outside.
Can be easily disconnected.

Next, a method of manufacturing the molding plate 20 according to the present invention will be described.

First, as shown in FIG. 3, a PC steel wire 22 is placed in a molding plate manufacturing frame 30. At this time, a tensile force is applied to the PC steel wire 22 as described above. Then, the mesh streaks 24 (see FIG. 2) are attached to the PC steel wire 22 so as to be wound, and the mounting hardware 26 (see FIG. 2) is attached to the PC steel wire 22.

Next, with the molding plate manufacturing frame 30 standing upright, concrete is poured from the opening. The injection amount of this concrete is calculated from the size and the number of forming plates 20 to be produced. Then, when the injection is completed, the forming plate manufacturing frame 30 is laid sideways, and a spatula or the like is inserted from the opening to level the concrete to some extent.

After the above steps are completed, the molding plate manufacturing frame 30 is placed on a rotating device (not shown) and rotated while being laid down and cleaned. Specifically, first, the low-speed rotation smoothes the concrete, the medium-speed rotation adheres the concrete, and the centrifugal separation separates the surplus water, and the high-speed rotation makes the inner surface of the concrete uniform so as not to drop.

In this way, the mold 3 for forming the forming plate is held for a predetermined time.
When 0 is rotated, the concrete inside is compacted, so the state of FIG. 4 is maintained even before curing. Therefore, even if the rotation of the molding plate manufacturing frame 30 is stopped, it does not fall down. Then, after that, the molding plate 20 is completed by carrying out the curing of the oclave.

Next, a modification of the above embodiment will be described.

FIG. 5 is a view showing a modified example of the forming plate manufacturing frame shown in FIG. In FIG. 5, the molding plate manufacturing frame 40 is designed to be split in half along the axial direction around the hinge 42. Then, when the centrifugal molding is completed, the concrete has a cylindrical shape. Therefore,
The forming plate 44 is manufactured by cutting this cylindrical concrete at the position indicated by the alternate long and short dash line in FIG.

Next, FIG. 6 is a perspective view showing a modified example of the molding plate 20 shown in FIG. The forming plate 50 in FIG.
A rod-shaped mounting member 52 is projected from the concrete body 54, and the mounting member 52 is formed by cutting the mesh streak 24 of FIG.

FIG. 7 is a view showing a retaining wall form 56 constructed by assembling the molding plates of FIG. In FIG. 7, a horizontal reinforcing bar 58 is attached in a horizontal direction to an assembling reinforcing bar 12 standing upright in the vertical direction, and a forming plate 50 is fixed by winding a mounting bracket 52 around the horizontal reinforcing bar 58. In this way, the retaining wall is formed by pouring concrete into the space formed between the opposed forming plates 50.

Next, FIG. 8 is a side view showing another modification of the molding plate 20 shown in FIG. Forming plate 60 in FIG.
Is a surface 62 on the opposite side of the mesh line 24 and the mounting bracket 26.
However, it differs from the molding plate 20 in that it is flat.

Then, a process of manufacturing such a molding plate 60 will be described with reference to FIG. In the figure, the molding plate manufacturing mold 40 of FIG. 5 is used, and a rubber plate 62 is attached to the inside. Specifically, the rubber plate 62 has a curved surface on one side and a flat surface on the other side. Therefore, when the curved surface side is attached to the inside of the molding plate manufacturing form 40, the other flat surface is inside. Is located in. Then,
Since 12 rubber plates 62 are attached,
It becomes the inner surface of the prism. Therefore, if concrete is poured into such a mold 40 for forming a molded plate having an inner surface and centrifugal force molding is performed, a cylinder having a dodecagonal outer peripheral surface is formed. And
By cutting this cylinder as shown in FIG. 9, the molding plate 60 shown in FIG. 8 can be manufactured. Here, if the rubber plate 62 is provided with an uneven pattern, a corresponding uneven pattern can be formed on the surface of the molding plate 60.

Alternatively, the various molded plates described above can be colored to have a beautiful appearance. As the coloring method, in addition to the method of coloring the completed molded plate, there is a method of injecting pre-colored concrete and forming the molded plate by centrifugal force molding. In addition to this, if only the outer surface of the molding plate is made of colored concrete and the intermediate layer and the inner surface are made of uncolored concrete, the cost increase due to the colored concrete can be minimized.

Alternatively, FIGS. 1 and 7 show a state in which the molding plates are stacked so that a half-wave shape is formed in the vertical direction, but the present invention is not limited to this, and the horizontal direction is a half-wave. The shaped plates may be stacked so that a wavy shape is formed. That is, although FIGS. 1 and 7 are side views, the retaining wall construction formwork may be constructed so as to have a form similar to those shown in these drawings in a plan view.

[0054]

As described above, according to the inventions of claims 1 to 3, concrete is poured into the inside of a cylindrical formwork, and the formwork is rotated to compact the concrete. Thus, the molded plate can be easily manufactured.

The molded plate thus manufactured acts to cancel the pressure from the outside and has sufficient strength, so that the soil can be backfilled before the concrete hardens.

According to the fourth aspect of the invention, it is possible to manufacture a molded plate that is reinforced and is resistant to cracking.

According to the fifth aspect of the invention, since the surface defining member is provided inside the mold, a desired surface shape can be easily applied.

Further, according to the invention of claim 6, it is possible to manufacture a molded plate for constructing a colored retaining wall.

In particular, according to the invention described in claim 7, since the colored layer is formed of concrete which has been colored in advance, it is possible to perform coloring in a simple process.

[Brief description of drawings]

FIG. 1 is a side view showing a form for constructing a retaining wall formed by using a forming plate according to an embodiment.

FIG. 2 is a view showing a forming plate used in FIG.
(A) is a front view, (B) is a plan view, and (C) is a side view.

FIG. 3 is a perspective view showing a mold used when manufacturing a molded plate.

FIG. 4 is a cross-sectional view of a forming plate manufacturing form cut at a right angle to a central axis.

FIG. 5 is a view showing a modified example of the forming plate manufacturing frame shown in FIG.

FIG. 6 is a perspective view showing a modified example of the forming plate shown in FIG.

7 is a diagram showing a retaining wall formwork constructed by assembling the molding plates of FIG. 6;

FIG. 8 is a side view showing another modified example of the forming plate shown in FIG.

9 is a cross-sectional view showing a molding plate manufacturing frame and a rubber plate for manufacturing the molding plate of FIG.

[Explanation of symbols]

 10,56 Retaining wall formwork 16 Concrete filling space 20,44,50,60 Forming plate 22 PC steel wire 30,40 Forming plate manufacturing formwork

Claims (7)

[Claims] 1. A method for manufacturing a forming plate that forms a concrete filling space for constructing a retaining wall and is left as a part of the retaining wall after completion, in a large-diameter cylindrical formwork. A method for manufacturing a retaining plate for forming a retaining wall, comprising the steps of injecting concrete into the mold, rotating the mold, and compacting the concrete inside the mold by centrifugal force. 2. The method for manufacturing a forming plate for constructing a retaining wall according to claim 1, further comprising the step of forming a large-diameter concrete pipe by the step, and then cutting the concrete pipe into the size of the forming plate. A method of manufacturing a molded plate for retaining wall construction, comprising: 3. The method for manufacturing a forming plate for constructing a retaining wall according to claim 1, wherein the mold has a partition plate inside, and the poured concrete is made into a size of the forming plate by the partition plate. A method of manufacturing a molded plate for constructing a retaining wall, characterized by being partitioned. 4. The method of manufacturing a retaining wall building molding plate according to claim 1, wherein a PC steel wire is arranged along an axis of rotation near an inner surface of the mold. A step of releasing the tensile force of the PC steel wire after hardening the injected concrete, by providing a tensile force to the PC steel wire, wherein the PC steel wire adheres to the concrete, A method for producing a retaining plate for forming a retaining wall, characterized in that the tensile force applied to the PC steel wire is transmitted to the concrete to apply prestress. 5. The method for manufacturing a retaining wall building molding plate according to claim 1, wherein the formwork is provided with a surface defining member inside, and the surface defining member has a surface. A method of manufacturing a retaining wall construction molded plate, characterized in that one surface of the molded plate is formed according to the shape. 6. The method for manufacturing a retaining plate for forming a retaining wall according to any one of claims 1 to 5, further comprising a coloring step of coloring the surface of the retaining plate that forms the wall surface of the retaining wall. A method of manufacturing a molded plate for retaining wall construction, comprising: 7. The method for manufacturing a retaining plate for forming a retaining wall according to claim 6, wherein the coloring step includes a first step of injecting pre-colored concrete into the mold to form a colored layer, A second step of curing the concrete of the colored layer and then injecting uncolored concrete to form the uncolored layer.