JPH08128200A - Form device for concrete - Google Patents

Abstract

PURPOSE: To facilitate assembly of a form with various shapes and to make easy the conveyance and arrangement of form components by mounting template holding bodies to both sides of posts erected in two rows, and fixing the rears of templates to the template holding bodies. CONSTITUTION: A plurality of posts 4 are erected in the shape of a row at required intervals by means of a device 8 erecting and bearing the posts, and a plurality of posts are erected in the shape of a row in opposition to the rows at an interval corresponding to the thickness of a concrete wall to be casted. Then, slide projections of L-shaped template holding bodies 76 are inserted into vertical gutters 10 with wide depth on both sides of post main bodies 1, positions are set with positioning device 75, and they are mounted with mounting pieces 74. Then, the rears of the templates 2 are brought into contact with the template holding bodies 76 and are fixed with fixing devices 79 such as screws, etc. By the constitution, the assembly of the form with various shapes is facilitated, at the same time, the storage and conveyance of form components are easily executed, and the form can be reused.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete formwork device assembled and constructed at a concrete casting site.
In detail, when assembling concrete formwork on site, it is easy to assemble formwork of concrete walls of various shapes, and easy to carry in and organize concrete formwork on site, reducing the area for material storage. In particular, the present invention relates to a technique for preventing a groove from being formed on a concrete surface due to a configuration for holding a template when the template is removed.

[0002]

2. Description of the Related Art Conventionally, in a concrete formwork apparatus assembled and constructed at a concrete pouring site, FIG.
As shown in the figure, a footing concrete 14 is cast on the split stone 13 and
The concrete form panels 15, 15 are juxtaposed side by side in parallel with each other, and at the upper end of the concrete form panels 15, 15, the width stays 16 and the crosspieces 17 are connected by nailing and fixed. The concrete is to withstand the casting pressure of the concrete to be cast, and then the concrete is cast.

[0003]

However, in such a configuration, the concrete form panel 15 is an off-the-shelf product having a fixed size, and the concrete form panel 15 having such a fixed size is used. Although it is relatively easy to assemble the formwork for forming a concrete wall having a size of an integral multiple of the size of the concrete formwork panel 15,
The assembly of the non-standard size is performed by cutting the fixed-size concrete form panel 15. In this way, the assembly of the form when the dimension of the concrete form panel 15 is out of order is troublesome, and time is required. In the case where the concrete form panel 15 is modified, it is difficult to reuse the modified concrete form panel 15. In addition, it is difficult to recycle the concrete form panel 15.
・ A large number of sheets are brought into the site, and these are placed and managed in the material storage area of the site.They become bulky, the transport capacity increases, and a relatively large space is used for the material storage area in the site. There was a problem that it required.

As shown in FIG. 15A, a template holding groove member 9a having a template holding groove 3 for inserting and holding the template 2 in an upright support body 1a is integrally formed. The end of the template 2 is inserted into the template holding groove 3 and held, and in this manner, the upright supporting column body 1a,
A device which changes the interval between 1a and facilitates assembling of a concrete formwork has been devised, and has been proposed as Japanese Utility Model Application No. 5-969.

However, in such a structure, after the concrete has hardened, the template 2 and the column body 1
When a is removed, a concave groove X due to the template holding groove member 9a is formed on the surface of the hardened concrete C,
This concave groove X is filled with mortar or the like, and such a finishing step is required. Further, in the conventional formwork device, it was difficult to make the surface of the footing concrete curved.

The present invention has been made in view of such a problem, and an object of the present invention is to easily assemble concrete forms of various shapes in assembling concrete forms on site. However, it is easy to transport and organize concrete formwork to the site, keeping the area for material storage small, and even if something other than standard dimensions is manufactured, the formwork can be reused and cost is reduced. This is also advantageous in terms of surface, and in particular, when the template is removed, it is possible to avoid formation of a concave groove due to the configuration for holding the template on the concrete surface, and furthermore, the footing concrete surface An object of the present invention is to provide a concrete formwork device that can be formed into a curved surface.

[0007]

According to a first aspect of the present invention, there is provided a concrete formwork apparatus assembled and constructed at a concrete pouring site, wherein at least both sides of the front, back and both sides of the quadrangle main body 1 are supported. A column 4 having a vertical groove 10 extending in the entire length along the length of the column body 1, means 8 for vertically supporting the column 4, and a column 4
, A plate-shaped template 2 for concrete forming, the side edges of which are abutted against each other, a pressing piece 73 for pressing the outer surface of the template 2, and a mounting piece 7 along the side surface of the column 4.
4, a template holding body 76 having a slide protrusion 72 which is slidably inserted into the vertical groove 10 on the side surface of the support column 4 on the mounting piece 74 and a slide protrusion. Numeral 72 comprises a positioning tool 75 such as a set bolt for positioning the vertical groove 10 by preventing its sliding.

In the second aspect, a vertical groove 10 is also formed on the back surface of the column main body 1, and a slide projection 72 is slidably inserted into the vertical groove 10.
And a positioning tool 75 such as a set bolt for positioning the flap square holding material 6. In the third aspect, the footing type plate 29 includes a plurality of hollow vertical members 77.
Are connected to each other at a bending portion 78 so as to be freely bent.

[0009]

According to the first aspect, the columns (4) are erected in a row at a required interval by means (8) for erection on a concrete foundation or a base, and further correspond to the thickness of the concrete wall to be cast. The columns 4 are opposed to each other at an interval and are erected in rows. Slide protrusions 72 are provided in the vertical grooves 10 on both sides of the pillar body 1.
Insert. Positioning tool 7 such as set bolt 75a
Position at 5. The L-shaped template retainers 76 are attached to both side surfaces of the column 4 via the attachment pieces 74. The pressing piece 73 of the template holding member 76 which is in contact with the back surface of the template 2 is fixed with a fixing tool 79 such as a screw so as to withstand the concrete driving pressure. Thus, on the spot, the support column 4, the means 8 for standing the support column 4, the template 2, and the template 2
And a template holding body 76 for fixing the frame to the support 4 to form a concrete formwork for a concrete wall having a desired thickness and a desired size. The workability of concrete formwork is greatly improved as compared with the conventional construction method using a ready-made concrete formwork panel with a predetermined size. It is possible to easily assemble a formwork outside the standard dimensions by changing the interval between the columns 4 and 4 standing upright. Nevertheless, these mold parts can be reused. In addition, the support 4, the means 8 for erecting the support 4, the template 2, and the template retainer 76 are handled separately. This makes it easy to carry it in. These materials can be stored compactly, can be advantageous in terms of space, and can be significantly reduced in various aspects including costs.

[0010] In particular, in the first aspect, the template 2 comprises a support 4.
Left and right L-shaped template holding bodies 7 attached to both side surfaces of
6 is fixed to the pressing piece 73 of 6 with a fixing tool 79 such as a screw, and the end faces of the left and right mold plates 2 and 2 can be abutted against each other. Since the concave groove X is not formed due to 9a, the connection points of the template plates 2 and 2 can be finished to a clean surface, and the connection points of the template plates 2 and 2 can be formed as in the conventional case. It is possible to eliminate the work of filling the resulting groove X with mortar,
The invention is found in that the workability can be greatly improved.

According to the second aspect, the sliding projection 72 of the corner holding member 6 is inserted into the vertical groove 10 on the back surface of the column main body 1, and the corner holding member 6 is positioned by the positioning tool 75. Attach. The struts 4 can be maintained in a line by holding the strut holding members 6 of the struts 4 through the flapping angles 5. In this manner, it is possible to easily attach the corner holding members 6 for aligning the columns 4 in a row.

In claim 3, the footing template 29
It is bent at its fold 78. The surface of the template 29 can be made curved by a large number of hollow vertical members 77, and the concrete surface of the footing concrete 14 can be formed into a curved surface.

[0013]

Embodiments of the present invention will be described below in detail with reference to the drawings. The concrete formwork device A according to the present invention is assembled and constructed at a concrete casting site. FIG. 1 shows a perspective view during construction, and FIG. 2 (a) shows a sectional view. The concrete formwork apparatus A is composed of a support 4, a template 2, a fluttering angle 5, a fluttering angle holding material 6, and a means 8 for vertically supporting the strut 4, and transports these materials to the site and stores them. After construction, it is disassembled and reused. Hereinafter, the configuration of each of the above materials will be described in detail.

As shown in FIGS. 4 and 7, the column 4 is an extruded product of aluminum, and has a deep vertical groove 10 formed on each surface of the hollow column main body 1. As shown in FIG.
A large number of positioning holes 7 penetrate the bottom piece 17 of the vertical groove 10 with a vertical space therebetween. The vertical groove 10 may have a shape other than the dovetail groove. And the support | pillar 4 may be a molded article of plastic.

FIG. 3 shows a means 8 for supporting the column 4, and a rectangular hole 18 is punched in a strip-shaped base 21 at intervals in the longitudinal direction thereof. At the lower end of the pillar-shaped, low-height support member 19, a rectangular fitting portion 20 that matches the above-mentioned hole 18 protrudes.
A substantially spherical fitting receiving portion 22 protrudes from the upper end of 9.
Thus, the base 21 is fixed to the upper surface of the footing concrete 14 with concrete nails or the like in the fixing holes 23, the square fitting portion 20 is inserted into the hole 18, and the upright support members 19, 19 are appropriately spaced. Erected,
The reinforcing rods 24 penetrate through the support members 19, 19 to prevent the support members 19 from falling down. Further, as shown in FIG.
The notches 26 of both legs of the gate-shaped spacer 25 are inserted into the reinforcing bars 24 between the reinforcements 19 to further prevent the pillar standing holding members 19 from falling down. Then, the lower part of the hollow round hole of the column body 1 is inserted into the spherical fitting receiving portion 22 of the column standing holding member 19, and the column 4 is placed and supported on the column standing holding member 19. It is.

At both ends of the base 21, strip-shaped side bases 27 are fixed to the footing concrete 14 with concrete nails or the like at fixing holes thereof so as to be substantially orthogonal to the base 21. A large number of supports 28 are erected on the side base 27 at substantially equal pitches, for example. The footing side frame 29 is formed by connecting a large number of hollow vertical members 77 so as to be freely bendable at a bent portion 78. The hollow vertical members 77 are inserted through the support body 28, and the footing side frame 29 is set up. It is installed and maintained. The footing template 29 and the upright support member 19 are substantially at the same height so that footing concrete can be cast between the facing footing templates 29,29. In this case, the side base 27 is not used and the side base 27 is
It may be fixed at.

A template retainer 7 for attaching the template 2 to the column 4
6 is formed in a substantially L-shape by a holding piece 73 for holding the outer surface of the template 2 and a mounting piece 74 along the side surface of the column 4, and the mounting piece 74 slides in the vertical groove 10 on the side surface of the column 4. The slide projection 72 is freely inserted. A mounting hole 80 is formed in the holding piece 73, and a screw hole 81 is formed in the mounting piece 74. The slide protrusion 72 is formed in a dovetail shape that matches the vertical groove 10 of the dovetail groove. Then, the slide protrusion 72 is attached to the vertical groove 1
0, a set bolt 75a as a positioning tool 75 is screwed into the screw hole 81, and the tip end of the set bolt 75a is pressed against the edge of the positioning hole 7 so that the set bolt 75a
The slide projection 72 is moved into the vertical groove 10 by the reaction force accompanying the screwing of
The template pressing body 76 is strongly fixed to the support column 4 by pressure contact so as to escape from the column. In this case, set bolt 7
Reference numeral 5a may be such that the template holding member 76 is fixed to an arbitrary position of the column 4 so as to abut on the groove bottom of the vertical groove 10.

The pressing piece 73 of the template holding body 76
A fixing tool 79 such as a screw is inserted into the mounting hole 80 and screwed into the template 2 to fix the template 2. in this case,
The templates 2, 2 are butted against each other in front of the column 4, so that no gap is formed between the end faces of the templates 2, 2. As shown in FIGS. 3 and 4, the flap corner holding member 6 is formed in a substantially Z shape, and a slide protrusion 72 is projected on a lower vertical piece 82 thereof, and a screw hole is penetrated through the slide protrusion 72. Then, the slide protrusion 72 is inserted into the vertical groove 10, the set bolt 75a as the positioning tool 75 is screwed into the screw hole, the tip of the set bolt 75a is pressed against the groove bottom of the vertical groove 10, and the positioning hole 7 Set bolt 7 on the hole edge
5a are pressed against each other to position the flutter angle holding member 6, the flutter angle 5 is inserted through the flutter angle holding material 6, and the plurality of struts 4 are aligned in a line. Can be held substantially linearly.

According to the above construction, the base 21 as the means 8 for erecting the support 4 on the footing concrete 14 is fixed with concrete nails, and the base 21 is selected in accordance with the concrete casting thickness. Hole 1 for base 21
The rectangular fitting portions 20 of the pair of column standing holding members 19 and 19 are fitted into the columns 8 and 18, and the hollow holes at the lower ends of the columns 4 are fitted into the spherical fitting receiving portions 22 of the column standing holding members 19. Mating,
The column 4 is erected on the column standing holding member 19. Reinforcing bars 24 are inserted into and supported by the pillar upright holding members 19 and 19, and long reinforcing bars 31 are bound and connected to such reinforcing bars 24 so as to be substantially orthogonal thereto.

At both ends of the footing concrete 14 in the width direction, the side bases 27 are fixed in the length direction by concrete nails, and the hollow vertical members 77 of the footing template 29 are attached to the supports 28. Insert it like this,
The footing template plates 29, 29 are erected so as to face each other. Prop 4
An L-shaped template holding member 76 is disposed on both side surfaces of the bolt, a slide protrusion 72 is inserted into the vertical groove 10, a set bolt 75a is screwed into the screw hole 81, and the tip of the set bolt 75a is 10 by pressing against the groove bottom or by positioning holes 7
To fix the template holding body 76 in place on the column 4. The template 2 is fixed to the column 4 by inserting screws into the mounting holes 80 of the holding pieces 73 of the template holding body 76. In this case, the side end faces of the template plates 2 and 2 are butted against each other.

Thus, the concrete formwork device A is assembled at the site, and concrete is cast between the mold plates 2 in the concrete formwork device A assembled in this way. According to such a construction method, the workability of the concrete formwork apparatus A is greatly improved as compared with the conventional construction method using a ready-made concrete form panel with a predetermined size. Then, by changing the spacing in the width direction and the spacing in the length direction of the footing concrete 14 of the support columns 4, it is possible to easily assemble a formwork having a non-standard size. With such a concrete formwork apparatus A, it is possible to form a framework in various shapes such as an L shape and a cross shape in a plan view.

The concrete is assembled between the facing mold plates 2, 2; 29, 29 in the concrete formwork apparatus A, and concrete is cast. The corner 5 is removed, the flank holding material 6 is removed, the template 2 is removed, and the support 4 is attached to the support upright holding member 1.
9 to remove them and to reuse them. Then, the footing template 29 is removed. Thus, the base 21, the side base 27, and the upright support member 19 are buried on the cast concrete side.

As described above, the support 4, the means 8 for erecting the support 4, the template 2, the ratchet holder 6, and the ratchet 5 are handled separately, and are carried in. Therefore, these materials can be stored compactly at the construction site, which is advantageous in terms of space, and greatly reduces the cost in various aspects. In particular,
The template 2 is fixed to the holding pieces 73 of the left and right L-shaped template holding bodies 76 attached to both side surfaces of the column 4 with the fixing tool 79 such as a screw. , 2 are fixed to the column 4 with their end faces abutting each other, and the concrete surface is not formed with the concave groove X due to the conventional template holding groove member 9a. Board 2,
The connection portion of 2 can be finished to a clean surface, and the work of filling the concave groove X generated at the connection portion of the templates 2 and 2 with mortar or the like as in the conventional case can be eliminated, and the workability is significantly improved. It is possible.

FIG. 2B shows step metal fittings 50 and 51, each of which is formed in an L shape and has horizontal connecting pieces 52 and 5 respectively.
3, the elongated pieces 54 and 55 are penetrated, and the vertical pieces 56 and 57 are formed with the slide protrusion 72 and the screw hole 81 is formed. Then, as shown in FIG. 2 (a), the step fittings 50, 51 are attached to the upper and lower struts 4, 4 by the set bolts 75a screwed into the slide protrusions 72 in the same manner as described above, and the lengths are increased. By changing the position within the range of the holes 54 and 55 and inserting the bolts at appropriate positions,
The nut is tightened so that a step is formed between the upper and lower mold plates 2 and 2, and the thickness of the concrete can be changed at this step.
The shape of the step fittings 50 and 51 can be changed, for example, as shown in FIGS.

As shown in FIG. 5, if necessary, a square pipe-shaped reinforcing spacer 48 is interposed between the template 2 and the flank 5 to reinforce the intermediate portion between the columns 4 and 4. Spacer 48
The screws inserted into the mounting holes of the mounting pieces 49 on both sides of the plate may be fixed to the template 2. As shown in FIG. 6, a groove-shaped vertical groove 10 is formed on the back surface of the reinforcing spacer 48, and the fluttering corner holding material 6 is fixed to the vertical groove 10 on the back surface. The flapping angle 5 may be held at 6. The reinforcing spacer 48 may be a hollow aluminum extruded product or a solid plastic molded product.

FIG. 9 shows another construction example, in which three pillars 4 are connected in a crank shape using bending joints 66, reinforcing spacers 48 are arranged between the pillars 4, and concrete is cast. Are assembled so that the lower surface of the becomes substantially crank-shaped. In this case, the bending joint 6
Reference numeral 6 denotes a lower member 67 and an upper member 68 which are connected by pins 69 so as to be freely bent. Further, 70 is a stretchable auxiliary column, and 71 is a stretchable reinforcing material.

FIG. 10 to FIG.
A tie fitting 32 is provided between the mold plates 2 and 2 to prevent the gap between the template plates 2 and 2 from being widened by the concrete driving pressure. FIG. 11 shows a structure in which a binding fitting 32 is installed between the columns 4 and 4, and FIG. That is, the rotating rod 33 having a threaded end is inserted into the positioning holes 7, 7 of the support 4 and the reinforcing spacer 48,
A bar-shaped bracket 34 having screw holes 35 formed at both ends is disposed between the facing mold plates 2, 2, a receiving piece 36 having a through-hole formed at both ends of the bar-shaped bracket 34 is detachably provided, and the rotating rod 33 is mounted. Template 2,
The threaded part is screwed into the screw hole 35 of the rod-shaped bracket 34 by rotating the handle 37, and the rod-shaped bracket 34 is pulled toward the template 2, 2. It is designed to be pressed against the back of

After the poured concrete has hardened, the handle 37 is rotated to pull out the rotating rod 33 from the rod-shaped metal fitting 34, the support 4, the reinforcing spacer 48 and the template 2 are removed, and the receiving piece 36 is removed. , So that they can be reused. Only the rod-shaped fitting 34 remains in the concrete. The receiving piece 36 is a small piece as shown in FIG. 13, and a small concave portion is formed on the concrete surface corresponding to the size of the receiving piece 36 of this small piece, which can be easily filled with mortar.

Incidentally, the template 2 may be made of corrugated paper.

[0030]

According to the first aspect of the present invention, there is provided a pillar having a square pillar main body, in which at least one of the front, back and both sides has a longitudinal groove extending in the entire length along the length direction of the pillar main body; Means for supporting and supporting the column, a plate-shaped template for concrete molding arranged with its side ends abutting on the front of the column, a holding piece for pressing the outer surface of the template, and a side surface of the column. A template holding body formed substantially in an L-shape with the mounting piece and having a slide protrusion slidably inserted into a vertical groove on the side surface of the support, and a slide protrusion formed on the vertical groove. In contrast, it is composed of positioning tools such as set bolts that prevent sliding and positioning is performed, so that the columns are erected in a row at the required intervals by means of standing on a concrete foundation or base. And then Supports are erected in rows in opposition with a gap corresponding to the thickness of the concrete wall to be cast, and slide projections are inserted into the vertical grooves on both sides of the support, and positioning tools such as set bolts The L-shaped template holding body is attached to both sides of the column via the mounting piece, and the holding piece of the template holding body that is in contact with the back of the template is like a screw. It is fixed with a fixture so that it can withstand the casting pressure of concrete. Thus, at the site, a column, a means for erecting the column, a template, and a template retainer for fixing the template to the column. The concrete formwork for the concrete wall of the desired size with the desired thickness with the body and the concrete formwork can be performed, and the concrete formwork is performed compared to the conventional method using the off-the-shelf concrete formwork panel with the predetermined dimensions. Greatly enhances the lineability It is possible to easily assemble the formwork out of the standard dimensions by changing the spacing of the columns to be erected, etc., and still be able to reuse these formwork parts, in addition to the columns and the means for erecting them. , The template and the template holding body can be handled separately,
There is an advantage that the material can be easily carried in, these materials can be stored compactly, the space can be advantageously used, and the cost can be significantly reduced in various aspects including the cost.

In particular, in the first aspect, the template is fixed to a pressing piece of a left and right L-shaped template pressing body attached to both side surfaces of the column with a fixing tool such as a screw. Since the end faces can be abutted against each other, no concave groove is formed on the concrete surface due to the conventional template holding groove member, and the connecting portion of the template is clean. It is possible to finish the surface and eliminate the work of filling the concave groove generated at the connecting point of the template with mortar etc. as in the past, and find the inventiveness in that the workability can be greatly improved. It is.

According to a second aspect of the present invention, a vertical groove is also formed on the back surface of the column main body, and a flap-square holding member that has a slide protruding portion slidably inserted into the vertical groove and holds a flap angle. Since it is equipped with a positioning tool such as a set bolt for positioning the flap square holding material, insert the slide projection of the flap square holding material into the vertical groove on the back of the support body,
The struts can be maintained in rows by positioning the flapping corner holding material with the positioning tool and holding the flapping corner holding material of each strut through the flapping corners. There is an advantage that the flap corner holding member for making the shape uniform can be easily attached, and this configuration can be simplified.

According to the third aspect of the present invention, since the footing template is formed by connecting a plurality of hollow vertical members at the bent portion so as to be freely bent, the footing template itself is bent at the bent portion. There is an advantage that the surface of the template can be curved with the hollow vertical members, and the concrete surface of the footing concrete can be formed into a curved surface.

[Brief description of drawings]

FIG. 1 is a cutaway perspective view of a working state of an embodiment of the present invention.

2A is a cross-sectional view, and FIG. 2B is a perspective view of a step fitting.

FIG. 3 is an exploded perspective view of the above, with a part thereof omitted.

FIG. 4 is a partially exploded perspective view of the same.

FIG. 5 is a partial perspective view of the same.

6A is a partial plan view of the same, FIG. 6B is a plan view of a reinforcing spacer, FIG. 6C is a rear view of the reinforcing spacer,
(D) is a plan view of the column, and (e) is a rear view of the column.

7A is a partial plan sectional view, FIG. 7B is a partial side view,
(C) is a partial side sectional view.

FIG. 8A is an exploded perspective view of another example of the step fitting,
(B) is a side view.

FIG. 9A is a perspective view of another construction example of the above, and FIG. 9B is an exploded perspective view of a bending joint.

10A and 10B show a working example of the above-mentioned tying fitting, wherein FIG. 10A is a plan view, FIG. 10B is a plan view of a reinforcing spacer, FIG. 10C is a rear view of the reinforcing spacer, and FIG. (E) is a rear view of the column.

FIG. 11 is a partially omitted plan sectional view in which a tie is erected between the columns.

FIG. 12 is a plan cross-sectional view in which a binding metal fitting is installed between the above-mentioned reinforcing spacers and a part of which is omitted.

FIG. 13 is a schematic perspective view of the same.

FIG. 14 is a perspective view of a conventional example.

15A and 15B show another conventional example, in which FIG. 15A is a cutaway perspective view of a column, and FIG. 15B is a sectional view of concrete.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Support main body 2 Form plate 4 Support 5 Flap angle 6 Flap angle holding material 8 Means for erecting a support 10 Vertical groove 29 Footing type plate 72 Slide protrusion 73 Pressing piece 74 Mounting piece 75 Positioning tool 76 Type plate holding body 77 Hollow vertical member 78 Bend

Claims (3)

[Claims] 1. A concrete formwork apparatus assembled and constructed at a concrete casting site, wherein at least both sides of a front side, a back side and both sides of a square pillar body have a total length along a length direction of the pillar body. A pillar having a longitudinal groove formed therein, means for standing and supporting the pillar, a plate-shaped template for concrete molding arranged with its side ends abutting on the front of the pillar, and the template A mold having a substantially L-shape formed by a holding piece for holding the outer surface of the support and a mounting piece along the side surface of the support, and the mounting piece having a slide protrusion slidably inserted into a vertical groove on the side surface of the support. A concrete formwork device, comprising: a plate retainer; and a positioning tool such as a set bolt for positioning the slide projection against the vertical groove by preventing its sliding. 2. A vertical groove is also formed on the back surface of the column main body. The vertical groove is provided with a slide projection that is slidably inserted into the vertical groove. 2. The concrete formwork device according to claim 1, further comprising a positioning tool such as a set bolt for positioning the material. 3. The concrete formwork device according to claim 1, wherein the footing template comprises a plurality of hollow longitudinal members connected at a bending portion so as to be freely bent.