JPH0633106Y2 - Concrete formwork - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> This invention relates to a concrete formwork, and more specifically, to a retaining wall for river revetment, road improvement, residential land development, steep slope collapse countermeasures, for example, masonry pattern, etc. The present invention relates to a concrete formwork useful for concrete construction for forming a decorative finish pattern.

<Conventional technology> Conventionally, retaining walls for river bank protection, road improvement, residential land development, and measures against collapse of steep slopes are often constructed of concrete, which is superior in terms of durability, material cost, and construction cost. However, in such a construction, when the surface is made flat, only the gray surface of the inorganic gray concrete is emphasized, which impairs the living environment and the natural environment.

Therefore, in recent years, it has been earnestly desired to develop a retaining wall that does not damage the living environment and the natural environment, and it is possible to express the appearance of a decorative finish pattern such as a masonry pattern on the surface of a concrete concrete retaining wall. A possible construction method has been developed. The applicant of the present application also previously proposed a construction technique in which a plurality of molds made of synthetic resin foam are combined to form a pattern of natural stones on the surface of the retaining wall (see Japanese Patent Laid-Open No. 59-213820). .

Since the formwork used for the above construction is made entirely of synthetic resin foam, it can be made sufficiently lightweight, and even when working in high places where a large number of pattern formwork must be stacked, use a crane or the like. There is an advantage that it can be easily installed manually.

<Problems to be solved by the invention> However, in the formwork method using the above-mentioned formwork, since a means for discharging excess water is not provided, the concrete immediately after placing is pressurized with a vibrator or the like to increase the density. And, the side pressure is applied to the formwork, excess water containing cement lye, etc. springs up as breathing water,
It will collect as a layer of water on the crown. This causes a problem that the pouring concrete converges slowly and that the top end finishing work cannot be started immediately.

On the other hand, it is possible to reduce the water: cement ratio by reducing the water content so that the excess water does not exist, but this reduces the slump value of concrete to deteriorate the fluidity and It is not preferable because it reduces efficiency.

Further, in the above-mentioned formwork construction method, since there is no means for discharging the air mixed in when concrete is poured,
There are problems that bubble avatars and cavities are generated on the surface and inside the concrete, the appearance of the constructed structure is deteriorated, and the density is reduced and durability is deteriorated.

In addition, a synthetic resin foam sheet having a large number of slits formed on the entire surface is stretched on the concrete pouring surface side of the formwork,
A formwork construction method has also been proposed in which excess water and air are discharged from the slits to solve the above problems. However, in the formwork method using such a foam sheet,
Unwanted patterns due to slits may be scattered on the entire surface of the concrete, which is not preferable.

This invention was made in view of the above problems,
Workability for placing concrete in the formwork method and workability at the top end of the next process without deteriorating the appearance of the concrete surface after removing the formwork or reducing the durability of the concrete structure. The purpose is to provide a concrete formwork that improves the like.

<Means for Solving the Problems> As a concrete formwork of the present invention for achieving the above-mentioned object, a concrete formwork which is entirely made of synthetic resin foam and is abutted against each other at adjacent formwork sides. In the frame, a plurality of grooves which are slits are formed on the side portion from the concrete pouring front surface side to the back surface side to form adjacent slits.

<Operation> According to the concrete formwork having the above-mentioned configuration, on the side part of the formwork,
Since a plurality of grooves that form slits are formed between adjacent formwork from the concrete pouring front surface side to the back surface side,
Excess water that oozes out from concrete and unnecessary air mixed during pouring can be immediately discharged out of the mold through this groove.

In this case, since the slits are formed in the side portions of the formwork, that is, in the boundary part between the adjacent formwork, even if the cast concrete permeates into the slits, in removing the formwork after concrete solidification The mold can be easily removed by simply removing this concrete from the groove on the side. Moreover, even if a pattern with slits is formed, this pattern can be made to follow the boundary part of the form, so, for example,
It can be made inconspicuous by applying a pattern or the like there.

<Example> Hereinafter, detailed description will be given with reference to the accompanying drawings illustrating an example.
FIG. 1 is a perspective view showing a concrete formwork of the present invention.

In FIG. 1, the molds (1) are, for example, adjacent molds (2).
(See FIG. 2) and the sides are provided so that they can abut against each other. Both of these molds (1) and (2) are filled with foamed resin particles in the mold cavity to be heated and expanded, It is composed of a rectangular flat plate-like body formed of expanded polystyrene obtained by heat fusion and other foams.

On the concrete pouring side surface of the formwork (1) (2), large and small natural stones are piled up irregularly, concave portions (10) (10a) (10b) (to form a so-called random stacking pattern) 10c), (20) (20a) (20b) (2
0c) are arranged irregularly, and between the recesses,
The ridges (11) and (21) for forming the joint portion are formed in various wide and narrow modes.

The one recessed portion (10a) of the formwork (1) and the one recessed portion (20a) of the adjacent formwork (2) cooperate with each other to form one natural stone pattern (W) on the retaining wall (W). A) (see FIG. 4) so that they can be exposed to the sides (1a) and (2a) of the formwork (1) and (2) respectively, that is, the sides (1a) and (1a), The ridges (11) and (21) are provided on the (2a) side in an open state without forming the ridges (11) and (21). Also the formwork
The recessed part (10b) of (1) and the recessed part (20b) of the adjacent formwork (2) are
It is installed facing the sides (1b) and (2b) of the formwork (1) and (2), respectively, so that the natural stone pattern (B) can appear on the retaining wall (W) in cooperation with each other. ing. Furthermore, the concave part (10c) of the formwork (1)
And the concave portions (20c) of the adjacent formwork (2) cooperate with each other so that the natural stone pattern (C) can be exposed on the retaining wall (W), respectively, the formwork (1) (2) It is provided so as to face the side portions (1c) and (2c) of the. Then, the concave part (10) of the formwork (1) and the adjacent formwork (2)
The recesses (20) of the work in cooperation with each other, the natural stone pattern on the retaining wall (W)
In order to expose (D), the sides (1
b) It is provided facing (1c), (2b) and (2c). Therefore, the peripheral side part (12) of the mold (1) is in a state of being partially cut by the recessed parts (10) (10a) (10b) (10c) except for the side part (1d). And the peripheral side part (22) of the formwork (2) is a side part.
Except for (2d), the recesses (20), (20a), (20b), and (20c) are partially cut away. The peripheral side portions (12) and (22) are provided so as to be the upper side portion and the lower side portion of the entire retaining wall (W).

Each side part (1a) (1b) (1c) (1d) of the formwork (1) has a slit (5) between the adjacent formwork (2) from the concrete pouring surface side to the back side. A plurality of grooves (3) (see FIGS. 3 and 4) are formed at appropriate intervals. Further, each side part (2a) (2b) (2c) (2d) of the formwork (2), like the formwork (1), adjacent formwork from the concrete pouring surface side to the back side. A plurality of grooves (4) to be slits (5) are formed at appropriate intervals with respect to (1). These grooves (3) and (4) serve as outlets for discharging excess water that springs as breathing water and unnecessary air mixed during casting out of the mold.

Incidentally, the grooves (3) and (4) may be provided so as to correspond to each other when the molds (1) and (2) are butted against each other at their sides, so that they are located at different positions. It may be provided. Also,
It is preferable that the gap width of the slit (5) is set to about 1 mm, that is, about 0.5 to 2 mm, which can discharge excess water but does not easily discharge sand etc. contained in the concrete as fine aggregate. is there. Further, as the slit (5), as shown in the figure, the groove (3) and (4) doors may be formed in a square hole shape, or may be formed in a round hole shape or another shape. . Further, as the molds (1) and (2), a slit having a square hole and a slit having a round hole may be used together.

With the above configuration, for example, as shown in FIG.
(1) and the adjacent formwork (2) are prepared one by one, the side part (1a) of the formwork (1) and the side parts (2a) of the formwork (2) adjacent to each other, the formwork Form (2) side part (1b) adjacent to side part (1b) of (1), and formwork
The form (1) and (2) are arranged alternately and in point symmetry so that the side (1c) of (1) and the side (2c) of the form (2) adjacent to each other face each other. So by pouring concrete,
In the part corresponding to the boundary of each form (1) (2) of the retaining wall (W),
Natural stone patterns (A) (B) (C) (D) can be formed (see FIG. 5). Therefore, the joints connected along the boundary between the molds (1) and (2) are not formed, and it is possible to integrally form a random stacking pattern exhibiting a natural texture. Moreover, since the respective molds (1) and (2) are arranged point-symmetrically, various masonry patterns can be formed by these two kinds of molds (1) and (2).

And, in this configuration, in particular, each side portion (1a) of the formwork (1) (2)
In (1b) (1c) (1d), (2a) (2b) (2c) (2d), slits (2) (1) between the concrete pouring front side and the back side are adjacent to each other. Since multiple grooves (3) and (4) that will be 5) are formed,
Excess water that springs up as breathing water and unnecessary air mixed in during pouring can be immediately discharged out of the mold through the grooves (3) and (4).

That is, since excess water can be immediately discharged from the groove (3) (4) to the outside of the form, it is possible to reduce breathing water containing cement lye and accelerate the development of the initial strength of concrete. You can Moreover, this allows the use of concrete having a high slump value, which is suitable for pouring work because it has fluidity even if the water content is large, so that workability during pouring can be improved. You can

In addition, since unnecessary air mixed during pouring can be immediately discharged from the groove (3) (4) to the outside of the form, it is possible to prevent bubble avatars and cavities on the concrete surface and inside. it can.

Furthermore, in this configuration, each side (1a) (1b) (1c) of the formwork (1) (2)
(1d), (2a) (2b) (2c) (2d) That is, since the slit (5) will be formed at the boundary of the formwork (1) (2), concrete will be added to this slit (5). Even if it is soaked, the sides (1a) (1b) (1c) (1d), (2a) are removed when removing the formwork after solidification of concrete.
It is only necessary to remove this concrete from the grooves (3) and (4) of (2b), (2c) and (2d), and the molds (1) and (2) can be easily removed. Moreover, even if a pattern is made by the slit (5), this pattern can be made to follow the boundary of the formwork (1) (2), so that the natural stone patterns (A) (B) (C) (D) It can be hidden without being noticeable.

Note that the present invention is not limited to the above-described embodiment, and for example, the concave portion may be a pattern that can reveal a pattern other than the masonry pattern of natural stone. However, at least two recesses on both sides may not be provided so that they can be combined with the recesses of another mold to form one natural stone pattern or the like. .

<Effect of device> As described above, according to the concrete formwork of the device,
On the sides of the formwork, multiple grooves are formed as slits between adjacent formwork from the concrete pouring front side to the back side, so excess water leaching from the concrete and mixing during pouring The unnecessary air can be immediately discharged out of the mold through this groove. That is, since the surplus water can be immediately discharged from the groove to the outside of the mold, for example, the breathing water containing the lye of cement can be reduced, and the initial strength of concrete can be accelerated. Moreover, this allows the use of concrete having a high slump value, which is suitable for pouring work because it has fluidity even if the water content is large, and the workability at the time of pouring is sufficiently improved. Can be increased. In addition, since unnecessary air mixed during pouring can be immediately discharged from the groove to the outside of the form, it is possible to prevent bubble avatars and cavities on the concrete surface and inside, improving the appearance. At the same time, it is possible to increase the density and improve the durability of the concrete structure. Further, since a slit is formed in the side part of the form, that is, in the boundary part of the form, even if concrete is soaked in this slit, when removing the form after concrete solidification, the concrete is removed from the groove of the side part. The mold can be easily removed. Moreover, even if a pattern is formed by slits, this pattern can be made to follow the boundary of the formwork, so that it can be made inconspicuous by applying a pattern etc., and the concrete surface after removing the formwork can be seen. It has a unique practical effect that it can improve the appearance.

[Brief description of drawings]

FIG. 1 is a perspective view showing a concrete formwork of the present invention, FIG. 2 is a perspective view of adjacent concrete formwork, FIG. 3 is an enlarged perspective view of a groove, and FIG. 4 is a plan view showing a state of use. FIG. 5 is a plan view of a retaining wall constructed using the formwork of this invention. (1) ... formwork, (2) ... adjacent formwork, (1a) (1b) (1c) (1d) (2a) (2b) (2c) (2d) ... side, (10) (10a) ) (10b) (10c) (20) (20a) (20b) (20c) ... Recesses facing the sides.

Claims (1)

[Scope of utility model registration request] 1. A concrete formwork which is entirely made of synthetic resin foam and is abutted against adjacent formwork at side portions, wherein the side portions are adjacent to each other from the concrete pouring front surface side to the back surface side. A concrete formwork characterized in that a plurality of grooves serving as slits are formed between the formwork and the formwork.