JP2002004412A - Form made of semi-precast concrete - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent deformation of a permanent form constructed of PCa panels and manufacture the form as a lightweight, inexpensive one by allowing escaping of lateral pressure produced by ready-mixed concrete placed into a space in the form. SOLUTION: The form for molding a structure such as a column or beam formed of concrete is constructed by interconnecting precast concrete panels 2 and perforated panels 3 in such a manner that a space 4 for concrete placing is formed therein.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a semi-precast concrete formwork.

[0002]

2. Description of the Related Art Conventionally, in a reinforced concrete structure, in a construction method in which a wooden or metal formwork is assembled at a site and cast-in-place concrete is poured into the inside to construct concrete columns and beams, columns and the like are used. There is a problem that it takes time to remove the mold after molding.

Conventionally, as a method of forming a concrete column, as shown in FIG. 7, a formwork having a rectangular cross section is integrally formed of thin precast concrete (hereinafter referred to as PCa) as shown in FIG. Formwork 10
The cast-in-place concrete is poured into the internal space 102 in the inside 1, and this PCa formwork 101 is made into a discard formwork as a constituent material of the pillar, and the assembling work and the removal work like the wooden or metal formwork as described above are performed. Some of them have shortened the construction period and saved labor. This is the first conventional method.

[0004] Further, in the pillar formed according to FIG. 7, an opening 104 may be formed on the side of the PCa form 101 in order to form a concrete wall 103 as shown in FIG. 8. is there. This is the second conventional method.

Further, as a method of forming a concrete beam, as shown in FIG. 9, a formwork having a gutter-like longitudinal section is integrally formed with a thin PCa.
There is also a construction method in which concrete in the site is poured into the internal space 202 and the floor plate portion 203 is formed. This is the third conventional method.

In the beam formed according to FIG. 9, a concrete wall 204 is formed as shown in FIG.
In some cases, an opening 205 is formed at the bottom of the PCa mold 201 in order to mold the PCa. This is referred to as a fourth conventional method.

[0007]

In the first and third conventional methods shown in FIGS. 7 and 9, the cast-in-place concrete is poured into the spaces 102, 202 of the PCa molds 101, 201. The PCa molds 101, 20
1 receives a large lateral pressure inside the PCa formwork 101,
201 may be deformed, and a noticeable surface of the pillar or beam after forming may be deformed.

The PCa mold 10 shown in FIGS.
In 1,201, there is a construction method in which each component is manufactured at a factory and integrated with a bolt or the like on site.
Also in this case, there is a possibility of deformation due to the side pressure as described above.

In the second and fourth conventional methods shown in FIGS. 8 and 10, the openings 104 and 205 are formed.
The side pressure as described above acts on the side orthogonal to the side having the opening, and the openings 104 and 205 open and move, and P
There is a possibility that the Ca mold frames 101 and 201 are separated from the walls 103 and 204 and the strength is significantly reduced.

Accordingly, an object of the present invention is to provide a precast concrete formwork which solves the above-mentioned problems.

[0011]

According to a first aspect of the present invention, there is provided a formwork for forming a structure such as a column or a beam formed of concrete. ,
A plate made of precast concrete and a perforated plate are connected so as to form a space for placing concrete therein.

According to a second aspect of the present invention, in the first aspect, the perforated plate is formed of a metal lath.

According to a third aspect of the present invention, there is provided a formwork for forming a pillar formed of concrete, wherein a cross section of a precast concrete plate and a perforated plate is square. In such a manner that a space for concrete casting is formed inside.

According to a fourth aspect of the present invention, in the third aspect, the perforated plate is formed of a metal lath.

According to a fifth aspect of the present invention, there is provided a formwork for forming a beam formed of concrete, wherein a cross section of a precast concrete plate and a perforated plate is concave. In such a manner that a space for concrete casting is formed inside.

According to a sixth aspect of the present invention, in the fifth aspect, the perforated plate is formed of a metal lath.

According to a seventh aspect of the present invention, there is provided a formwork for forming a beam formed of concrete, wherein precast concrete plates are disposed on both sides, and lower portions of both the precast concrete plates are provided. The space is connected by a perforated plate to form a space for placing concrete therein.

According to an eighth aspect of the present invention, in the seventh aspect, the perforated plate is formed of a metal lath.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described based on an embodiment shown in FIGS.

FIG. 1 shows a first embodiment of a semi-precast concrete formwork for a pillar, in which (a) is a cross-sectional view,
(B) is a right side view of (a), and (c) is a cross-sectional view in which cast-in-place concrete is cast into the formwork to form a column.

In the first embodiment, reference numeral 2 denotes a thin precast concrete plate (hereinafter also referred to as a PCa plate) constituting a part of the semi-PCa formwork 1, and reference numeral 3 denotes a part constituting the formwork. 3 shows a perforated plate.

The PCa plate 2 has a reinforcing member such as a wire mesh, a fiber, or a truss bar buried in the body, and the perforated plate 3 is integrally connected by burying both ends thereof.
The semi-PCa formwork 1 including the PCa plate 2 and the perforated plate 3 is manufactured in a factory or the like.

In the embodiment shown in FIG. 1, two pillars are formed by a PCa plate 2 having an L-shaped cross section, and the other two faces are formed by a perforated plate 3 having an L-shaped cross section. With these, the cross section is made square (R-shaped), and a space 4 for concrete casting is formed therein. At both ends of the PCa plate 2, connecting portions 2a and 2b with the perforated plate 3 are formed to be bent.

The vertical length of the PCa plate 2 is set to a desired length according to the columns to be constructed, and the vertical length of the perforated plate 3 is formed to be the same as the PCa plate 2.

The thickness of the PCa plate 2 is set to be thin enough to have a function as a formwork when cast-in-place concrete is cast. It is about 30 mm.

The perforated plate 3 is formed of a plate having holes such that ready-mixed concrete does not flow out, such as a metal mesh plate or a metal lath plate.

When using the semi-PCa formwork 1 described above,
The half P shown in FIGS. 1A and 1B manufactured in a factory or the like.
The Ca formwork 1 is set upright at the construction position of the pillar on the site. The half PCa mold 1 is an example in which the surface having the perforated plate 3 is covered with the interior material 5 or the like.

Next, cast-in-place concrete 6 is poured into the space 4 of the semi-PCa formwork 1 installed as described above from above as shown in FIG. 1 (c). At the time of the casting, the lateral pressure due to the ready-mixed concrete escapes from the holes of the perforated plate 3, and the lateral pressure acting on the PCa plate 2 is reduced.
The burden of the side pressure of the plate 2 is reduced. Then, by hardening the cast-in-place concrete 6, the PCa plate 2 and the perforated plate 3 are integrated.

FIG. 2 shows a second embodiment of a semi-precast concrete formwork for a pillar, in which (a) is a cross-sectional view, (b) is a front view of (a), and (c) is a site on the formwork. It is the cross-sectional view which cast the concrete and formed the pillar.

The semi-PCa formwork 11 is formed by forming PCa plates 2 and 2 in the same direction as the above-described PCa plates 2 and 2 on one side of a column to be formed.
The opposing surfaces in the other direction are formed by the same perforated plates 3 and 3 as described above,
Thus, the cross section is made into a square (R-shaped), and a space 4 is formed therein. At both ends of the PCa plate 2, connecting portions 2a and 2b with the perforated plate 3 are formed to be bent.

The semi-PCa formwork 11 of the second embodiment is also manufactured in a factory, and is installed upright at the construction position of the pillar at the site, as shown in FIG. Pour concrete 6 in place. The lateral pressure due to the ready-mixed concrete at the time of this casting escapes from the hole of the perforated plate 3 in the same manner as described above, the burden of the lateral pressure of the PCa plate 2 is reduced, and the spread of the opposing surface dimensions of the two PCa plates 2 is small. In addition, the connection by the perforated plate 3 further prevents the spread, and reduces the deformation of the pillar. In addition, the adhesion between the concrete of the wall 7 cast in the portion of the perforated plate 2 and the concrete 6 cast in the space 4 is favorably performed, and the strength of the portion is also increased.

Furthermore, in the semi-PCa formwork 11 of the second embodiment, the half-Pa molds 11 having different cross-sectional areas are simply changed in the cross-sectional length of the perforated plate 3 at the time of manufacture at the factory.
The Ca formwork 1 can be easily manufactured, and it is possible to easily cope with the free planning of the columns.

FIG. 3 shows a third embodiment of a semi-precast concrete formwork for a pillar, in which (a) is a cross-sectional view, (b) is a front view of (a), and (c) is a front view thereof. It is the cross-sectional view which cast the cast-in-place concrete in the formwork and shape | molded the pillar.

The semi-PCa formwork 21 is formed by forming substantially one surface of a pillar to be formed by the same PCa plate 2 as described above, and the other three surfaces by the same perforated plate 3 as described above. An L-shaped PCa plate 2 having a bent connecting portion 2a similar to the above,
A part of two ends of the PCa plate 2 and a PCa plate 2
Are formed by a perforated plate 3, the cross section of which is rectangular (R-shaped), and a space 4 is formed therein.

The semi-PCa formwork 21 of this example is effective when a part of the surface is finished with the PCa plate 2 and the amount of the PCa plate 2 used is reduced.

In the third embodiment, the same functions and effects as those of the above embodiments can be exhibited.

FIG. 4 shows a fourth embodiment of a semi-precast concrete formwork for columns, in which (a) is a cross-sectional view, (b) is a front view of (a), and (c) is a front view of (a). It is the cross-sectional view which cast the cast-in-place concrete in the formwork and shape | molded the pillar.

In this semi-PCa formwork 31, four corners of the pillar to be formed are formed by the same PCa plate 2 as described above, and four surfaces thereof are formed by the same perforated plate 3 as described above. It has a square shape (a square shape), and a space 4 is formed therein.

In the fourth embodiment, the same functions and effects as those of the above embodiments can be exhibited.

FIG. 5 shows a fifth embodiment showing a semi-precast concrete formwork for beams, in which (a) is a longitudinal sectional view, (b) is a bottom view of (a), and (c) is a bottom view. FIG. 3 is a longitudinal sectional view in which cast-in-place concrete is cast into the formwork to form a beam.

The semi-PCa mold 41 is formed on both sides of a beam to be formed with the same PCa plates 2 and 2 as described above.
The bottoms of the plates 2 and 2 are formed by the same perforated plate 3 as described above, so that the vertical cross-sectional shape is a concave shape with an open top, and a space 4 is formed therein. At the lower end of the PCa plate 2, connecting portions 2a and 2b with the perforated plate 3 are formed to be bent. A perforated plate 3 is also provided at the upper end of both PCa plates 2 and 2.
a is protrudingly provided.

In the semi-PCa formwork 41 of the fifth embodiment, it is manufactured in a factory, horizontally arranged at the construction position of the beam at the site, and cast-in-place concrete is poured into the space 4 from above. . The lateral pressure due to the ready-mixed concrete at the time of this casting is released through the holes of the perforated plate 3 in the same manner as described above.
The load on the a-plate 2 side pressure is reduced, the size of the opposing surfaces of the two PCa plates 2 and 2 is reduced, and the perforated plate 3 further prevents the spread and reduces the deformation of the beam.

Further, the adhesion between the concrete of the wall 7 cast in the portion of the perforated plate 3 at the bottom and the concrete 6 cast in the space 4 is well performed, and the strength of the portion is also increased. On the upper part of the formwork 41, a floor plate 8 is cast and formed by cast-in-place concrete. At this time, the reinforcing bars 9 of the floor plate 8 are arranged through the holes of the upper perforated plates 3a, 3a. Further, since the perforated plate 3a protrudes from the upper portion, it is possible to cast concrete of different strength between the beam portion and the floor portion.

FIG. 6 shows a sixth embodiment showing a semi-precast concrete formwork for beams. This half PCa formwork 51
Is formed on one side of the beam to be formed with the PCa plate 2 as above, and on the other side and the bottom with the same perforated plate 3 as above.
The vertical cross-sectional shape is formed into a concave shape in which an upper portion is opened, and a space 4 is formed therein. Note that P
At the lower end of the Ca plate 2, a connecting portion 2a with the perforated plate 3 is formed to be bent. Also, a perforated plate 3a is protruded from the upper ends of both PCa plates 2.

In the sixth embodiment, similarly to the fifth embodiment, the formwork 51 is manufactured in a factory, is horizontally arranged at the construction position of the beam on the site, and is cast into the space 4 from above. Pour concrete.

In the sixth embodiment, the same functions and effects as in the fifth embodiment are exhibited.

Although the above embodiment has been described with reference to the example of the formwork for columns and beams, the present invention can also be applied to formwork for structures other than columns and beams.

[0048]

As described above, the semi-precast concrete formwork of the present invention is manufactured in a factory or the like, and is placed at a predetermined position on the site, and is cast in the space for concrete casting. Casting concrete and using it as a formwork eliminates the need to remove the formwork.

Further, at the time of casting the cast-in-place concrete, the lateral pressure due to the ready-mixed concrete escapes from the holes of the perforated plate, and the lateral pressure acting on the form is reduced, thereby preventing the form from being deformed. Deformation of a structure such as a molded column or beam can be prevented.

Further, by changing the length between the precast concrete plates in the perforated plate, the cross-sectional shape of the formwork can be easily changed. Can easily face each other.

Also, by using a metal lath as the perforated plate, it is possible to reduce the weight and cost as compared with the case where the whole is formed of a precast concrete plate.

Furthermore, surplus water in the cast-in-place concrete poured into the space escapes, and appropriate strength can be obtained.

[Brief description of the drawings]

1A and 1B show a first embodiment in which the present invention is applied to a column formwork, wherein FIG. 1A is a transverse sectional view, FIG. 1B is a right side view of FIG. 1A, and FIG. FIG.

FIGS. 2A and 2B show a second embodiment in which the present invention is applied to a column formwork, wherein FIG. 2A is a cross-sectional view, FIG. 2B is a front view of FIG. FIG. 4 is a cross-sectional view of a state in which the casting is performed.

3A and 3B show a third embodiment in which the present invention is applied to a column formwork, wherein FIG. 3A is a cross-sectional view, FIG. 3B is a front view of FIG. 3A, and FIG. FIG. 4 is a cross-sectional view of a state in which the casting is performed.

4A and 4B show a fourth embodiment in which the present invention is applied to a column formwork, wherein FIG. 4A is a cross-sectional view, FIG. 4B is a front view of FIG. FIG. 3 is a cross-sectional view of a state in which the casting is performed.

5A and 5B show a fifth embodiment in which the present invention is applied to a beam formwork, wherein FIG. 5A is a cross-sectional view, FIG. 5B is a bottom view of FIG. 5A, and FIG. FIG. 3 is a longitudinal sectional view of a state in which the casting is performed.

FIG. 6 is a side view showing a sixth embodiment in which the present invention is applied to a beam formwork.

FIG. 7 is a cross-sectional view showing a conventional pillar formwork.

FIG. 8 is a cross-sectional view showing another conventional formwork for a pillar.

FIG. 9 is a longitudinal sectional view showing a conventional beam formwork.

FIG. 10 is a longitudinal sectional view showing another conventional formwork for beams.

[Explanation of symbols]

 1,11,21,31,41,51 Formwork 2 Precast concrete board 3 Perforated board 4 Space

Claims (8)

[Claims] 1. A formwork for forming a structure such as a pillar or a beam formed of concrete, wherein a space for casting concrete is formed inside a precast concrete plate and a perforated plate. Semi-precast concrete formwork characterized by being connected in such a manner. 2. The semi-precast concrete formwork according to claim 1, wherein said perforated plate is formed of a metal lath. 3. A formwork for forming a pillar formed of concrete, wherein a plate made of precast concrete and a perforated plate are connected so as to have a rectangular cross-sectional shape, and concrete is provided inside. A semi-precast concrete formwork in which a space for casting is formed. 4. The semi-precast concrete formwork according to claim 3, wherein said perforated plate is formed of a metal lath. 5. A formwork for forming a beam formed of concrete, wherein a precast concrete plate and a perforated plate are connected so that the cross-sectional shape is concave, and the concrete is formed inside. A semi-precast concrete formwork in which a space for casting is formed. 6. The semi-precast concrete formwork according to claim 5, wherein said perforated plate is formed of a metal lath. 7. A formwork for forming a beam formed of concrete, wherein a plate made of precast concrete is disposed on both sides, and lower portions of both precast concrete plates are connected by a perforated plate. A semi-precast concrete formwork, wherein a space for concrete casting is formed therein. 8. The semi-precast concrete formwork according to claim 7, wherein said perforated plate is formed of a metal lath.