JPH0881966A - Formwork for retaining wall construction - Google Patents

Abstract

PURPOSE: To provide forms being reinforced in an extent that back-filling is enabled without waiting the curing of concrete and displaying appearance in addition to the reinforcement and being used for constructing concrete. CONSTITUTION: In retaining wall forms 10, in which a plurality of molding plates 20 are erected and arranged and concrete filling spaces 16 are formed, at least one surfaces are formed in curved surfaces in the molding plates 20. The projecting sections of the curved surfaces are erected and disposed towards the outside, and left even after the curing of placed concrete and used as parts of a retaining wall.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold for constructing a retaining wall, and more particularly to a mold 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 formwork manufactured in advance in a factory, and concrete is poured into this space. There is a construction method, and such a construction method is disclosed in, for example, Japanese Utility Model Laid-Open No. 60-80138. 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 formwork used here is a flat thin plate member 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.

[0005] In recent years, due to the social situation of protecting the landscape, there is a need for a retaining wall that emphasizes aesthetics, so a formwork with a beautiful appearance is required.

[0006] Therefore, an object of the present invention is to provide a formwork for concrete construction which is strengthened to such an extent that it can be backfilled without waiting for curing of the concrete, or in addition, has a beautiful appearance.

[0007]

In order to achieve the above object, the invention according to claim 1 is a form for retaining wall construction in which a plurality of forming plates are vertically arranged to form a space for concrete filling, wherein the forming is performed. At least one surface of the plate is a curved surface, and the plates are lined up with the convex direction of the curved surface facing outward, and are left as a part of the retaining wall even after the cast concrete has hardened. Is characterized by.

According to a second aspect of the present invention, in the formwork for constructing a retaining wall according to the first aspect, the forming plate is curved in one direction, and a surface on a convex side of the curve is directed outward. It is characterized by being placed side by side.

According to a third aspect of the present invention, in the mold for constructing the retaining wall according to the first aspect, one surface of the molding plate is a flat surface and the other surface is a curved surface. It is characterized by being able to stand upright with the surface facing outward.

According to a fourth aspect of the present invention, in the formwork for constructing a retaining wall according to any one of the first to third aspects, the forming plate applies a tensile force to the PC steel wire during manufacturing. In addition, after the concrete is poured and hardened, the PC steel wire adheres to the concrete so that the tensile force applied to the PC steel wire is transmitted to the concrete and prestressed. And

According to a fifth aspect of the present invention, in the formwork for constructing the retaining wall according to any one of the first to fourth aspects, the molding plate has a pattern or a pattern on a surface arranged on the retaining wall side. It is characterized by being colored.

[0012]

According to the first aspect of the invention, the molds are vertically arranged with the convex direction facing outward. For example, claim 2
As in the invention described above, in the case of being curved in one direction,
The convex side faces outward. Alternatively, when one surface is a flat surface and the other surface is a curved surface as in the invention according to claim 3, the outward direction of the convex direction means that the convex direction of the curved surface is outward. That is, the surface forming the plane is directed outward.

In this way, when the convex directions are arranged vertically, the outer surface of the molding plate of the mold is convex, so that an arch action for relaxing the stress caused by the pressure from the outside acts. Then, it has a sufficient strength. By doing so, even if the soil is backfilled before the concrete hardens, the strength of the formwork is great and it is possible to resist the earth pressure and function as a retaining wall.

Further, since the retaining wall surface is constructed by leaving the mold on the opposite side to the mold without removing it, the work of removing the mold can be omitted.

According to the invention described in claim 4, a PC
Since the tensile force is applied by the steel wire, cracks are less likely to occur when the concrete hardens.

According to the fifth aspect of the invention, since the surface arranged on the retaining wall side is patterned or colored, the retaining wall has a beautiful appearance.

[0017]

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 according to an embodiment. In the drawing, the retaining wall formwork 10 has a pair of molding plates 20 arranged outside a pair of rebars 12 for assembly that are erected in advance, and the molding plates 20 facing each other are connected by a connecting rebar 14. It is composed of. 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 forms a 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 difficult 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 forming plate 20 according to this embodiment is constructed as described above. Next, a mold for producing the forming plate 20 will be described.

FIG. 3 is a perspective view showing a mold used in manufacturing the molded 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, a flange 32c is also formed inside the curve of the mold piece 32 so as to be continuous 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, the 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 in the end frame piece 34, and the PC steel wire 22 is exposed to the outside through the window portion 34a. 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.

The molding plate manufacturing frame 30 is constructed as described above. Next, a method of manufacturing the molding plate 20 using the molding plate manufacturing frame 30 will be described.

First, as shown in FIG. 3, a PC steel wire 22 is placed in a forming 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, concrete is poured from the opening with the molding plate manufacturing frame 30 standing upright. 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 in a clean state while lying down. 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 give them 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. 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.

[0047]

As described above, according to the inventions of claims 1 to 3, since it acts to cancel the pressure from the outside and has sufficient strength, the soil before the concrete hardens. Can be backfilled.

Further, according to the invention described in claim 4, there is an effect that the molded plate is reinforced by the PC steel wire and cracks are less likely to occur.

Further, according to the invention of claim 5, a beautiful retaining wall can be obtained by applying a pattern or coloring.

[Brief description of drawings]

FIG. 1 is a side view showing a formwork for constructing a retaining wall 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 (5)

[Claims] 1. A formwork for constructing a retaining wall in which a plurality of molding plates are vertically arranged to form a space for concrete filling, wherein at least one surface of the molding plate has a curved surface, and the convex surface of the curved surface is convex. It is lined up with the direction facing outward,
A formwork for retaining wall construction characterized by being left as part of the retaining wall even after the cast concrete has hardened. 2. The formwork for constructing a retaining wall according to claim 1, wherein the forming plates are curved in one direction, and are arranged side by side with the convex side surface of the curve facing outward. Formwork for building retaining wall. 3. The mold for constructing a retaining wall according to claim 1, wherein the molding plate has one surface that is a flat surface and the other surface that is a curved surface, and the one surface faces outward. Formwork for retaining wall construction, which is characterized by being placed side by side. 4. The retaining wall construction formwork according to claim 1, wherein the forming plate applies a tensile force to the PC steel wire at the time of manufacturing, and the concrete is cast. For retaining wall construction, characterized in that the PC steel wire adheres to the concrete after setting and hardening so that the tensile force applied to the PC steel wire is transmitted to the concrete and prestressed. Formwork. 5. The retaining wall construction form according to claim 1, wherein the molding plate has a pattern or coloring on a surface arranged on the retaining wall side. Formwork for retaining wall construction characterized by