JPH05263523A - Concrete form - Google Patents

Abstract

PURPOSE:To make unnecessary the drilling of holes in small panels such as ply wood of an acerose tree and to make it possible to connect the panels to each other to form a concrete form. CONSTITUTION:A concrete form is so place that a bar body 1 is put between a pair of panels 8 and 9 to butt their ends at each other, and the concrete form is built up by clamping a pair of panels 8 and 9 with a holding member screwed into the bar body 1 and a plaster member 15 contacted with the bar body 1. Accordingly, small panels can be used. The concrete form is so constituted that a tie rod 28 passes through a screw hole 4 of the bar body 1 to connect with a separator 39. According to the constitution, the concrete form can be built-up without drilling any hole in the panels.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete formwork used in the production of structures such as walls, beams and floors made of a material such as concrete.

[0002]

2. Description of the Related Art Conventionally, as a concrete pouring formwork, a wooden plate is formed on the back surface of a plywood sheet (for example, a plywood sheet having a length of 1800 mm, a width of 900 mm, and a thickness of 12 mm) that is made by laminating lauan wood. Concrete formwork has been used in which piers are nailed to reinforce. However, because the concrete formwork made by nailing the wooden piers is bent and the dimensional accuracy is low, it is easy to make a misalignment between adjacent formworks when the formwork is assembled, and the formwork is removed. After that, it was necessary to carry out repairs such as harvesting work and levering mortar. In particular, there was a problem in the case of the concrete leaving construction method and the construction method of directly attaching the cloth for interior to the concrete placing surface.

Therefore, instead of the wooden pier, a concrete formwork has been developed in which a metal pier is screwed to plywood. An example of this concrete formwork is shown in FIG. In this concrete formwork, metal stiles 51 are screwed to the back surface of the plywood 50, and the two plywoods 50 are erected so as to face each other at a predetermined interval according to the height and width of the wall or the like to be constructed. At the same time, the separator 53 having the cones 52 screwed at both ends is interposed between the two plywoods 50, and the tie rods (for example, foam ties) 54 are inserted into the holes 55 formed in the plywoods 50. It is connected to the separator 53 through the cone 52 by being screwed on 52, and subsequently,
In order to withstand the pressure of the cast concrete, a metal reinforcing pipe 56 is arranged at a right angle to the pier 51, and a nut 57 screwed to the tie rod 54 is tightened to make a metal washer 58. The reinforcing pipe 56 is fixed to the pier 51 (for example, Japanese Patent Publication No. 63-23).
347 publication).

[0004]

However, the above-mentioned conventional concrete formwork has the following drawbacks. That is, the hole 55 formed in the plywood 50 initially has the same diameter as the tie rod 54, but the hole 55 is repeatedly used.
Becomes larger, a clearance is generated between the hole 55 and the tie rod 54, and the poured concrete enters the clearance to make it difficult to disassemble the mold, or the clearance causes the mold and the tie rod 54 to be separated from each other. May become loose and the desired product may not be obtained.

Further, the concrete formwork after dismantling is seriously damaged and cannot be reused again and again, so that there is a disadvantage that waste of wood resource is large. Further, in order to make it easy to remove the plywood 50 from the concrete, since a release agent, that is, a release agent is applied to the surface of the plywood 50, it is difficult to dispose of it, and when it is discarded, it is chopped and discarded. Will be done.

Moreover, although the plywood used at present is completely devoted to the South Sea Lauan wood, it is expected that it will be difficult to supply the Lauan wood due to lack of forest resources in the future, or the cutting of the Lauan wood is prohibited due to global environmental problems. It is in a situation where things can be considered. Therefore, in order to deal with these problems, it is necessary to consider using coniferous trees such as northern timber and domestic timber in the future. In that case, due to the nature of the coniferous tree, which is easily knotted or fragile, it is not possible to shave the coniferous tree in the circumferential direction by rotary lace to make veneer, and to make plywood with a large area such as lauan plywood. Is currently not possible. And the plywood made from conifers must be small in area. However, in the above-mentioned conventional concrete pouring formwork that lacks means for connecting small plywoods, there is a problem that plywood made of softwood cannot be applied, and it is not possible to deal with lauan plywood that gradually becomes thin. There's a problem.

Further, since reinforcing bars and the like are usually forested between the plywoods 50 arranged so as to face each other, the separator 5
In some cases, the axis of No. 3 cannot be aligned with the center of the hole 55 formed in the plywood 50. In that case, the separator 53 and the tie rod 54 cannot be successfully connected via the cone 52. In such a case, the woodworking drill will have to re-hole the plywood 50 at a momentum, and there is a risk that the operator will be swayed around in the rain or an electric shock will occur.

Further, the work of removing the old plywood from the metal splint and reattaching the new plywood is usually performed at a construction site or a nearby work place. At that time, the new plywood is marked with a position corresponding to the screw hole of the metal peg, and a hole is accurately drilled at that position, as shown in FIG. 14, the plywood 50 and the metal peg 51 are formed. It must be screwed with bolts 59 and nuts. The work of drilling a hole at an accurate position and fixing the screw at the construction site requires manpower and time, which is a major drawback of the method of using the metal splint 51 having excellent accuracy.

Therefore, in view of the above-mentioned problems of the prior art, in order to construct a form using a small panel (including plywood) and to provide a separator and a tie rod for fixing a reinforcing pipe, The problem was how to construct the panels so that they could be connected to each other without making holes.

Therefore, an object of the present invention is to solve the above problems by making it possible to use not only lauan plywood, but also another plate material having a small area, which is an alternative to lauan plywood. The plywood made of softwood, etc. is manufactured so that it can be used as, and there is no need to make holes for the separator in the plywood at the construction site, etc., and it can be easily and efficiently assembled at the site, etc. The object of the present invention is to provide a concrete formwork having a strength equivalent to that of the formwork and having a sufficient function of the formwork.

[0011]

In order to achieve the above object, the present invention is configured as follows. That is, the present invention relates to a rod body having a fitting hole penetrating therethrough, a pressing member having a tubular portion inserted into the fitting hole and a flange portion integral with the tubular portion, and the rod body sandwiched therebetween. A panel in which end faces are arranged in abutting state, a contact member having a flat surface that cooperates with the flange portion to clamp the panel, and the flange portion of the pressing member fixed to the rod body is spaced apart to face each other. The present invention relates to a concrete formwork having a separator to be made and a tie rod which is screwed to a screw provided in the cylindrical portion to tighten the pressing member and the abutting member.

Further, in this concrete formwork, the panel can be made of plywood produced by stacking a plurality of single plates obtained by cutting softwood in the longitudinal direction. In some cases, the panel is not limited to plywood, but other plates or composite plates such as metal plates, synthetic resin plates, concrete plates, and waste plywood plates may be used.

Further, in this concrete formwork, it is preferable that the abutting member is constituted by a cylindrical triangular column.

Further, the concrete formwork has a reinforcing member which is fixed to the plurality of pad members arranged in a separated state so as to intersect with the pad members.

Further, in this concrete formwork, the reinforcing member can utilize the same cylindrical triangular column as the abutting member.

Further, in this concrete formwork, the ends of the abutting members can be connected to each other at a predetermined angle by using a joint.

[0017]

Since the concrete formwork according to the present invention is constructed as described above, it works as follows. Regarding this concrete formwork, first, the rod body is sandwiched between them so that the end faces of the pair of panels are butted against each other, and then the tubular portion of the pressing member is fitted into the rod body by screwing or the like, A contact member is applied to the rod body from the side opposite to the pressing member, and a pair of panels is sandwiched to form a panel row. In this way, a pair of assembled panel rows is prepared, the pair of panel rows are arranged such that the flange portions face each other at a predetermined interval corresponding to the thickness of the wall, and the separator is arranged between the flange portions. Then, the tie rod is screwed onto the inner peripheral surface of the tubular portion to tighten the pressing member and the abutting member with the panel interposed, and the tip of the tie rod is connected to the separator via a connecting tool such as a cone. Further, a reinforcing member made of the same member as the pad member is fixed so as to cross the plurality of rods,
The concrete formwork is completed.

In this way, since the form is assembled by sandwiching the panel between the pressing member and the abutting member, a panel having a small area can be used. Further, since the tie rod penetrates the screw hole of a rod body such as a long rectangular rod and is connected to the separator, the concrete form can be assembled without making any holes in the panel.

Further, as the abutting member, a cylindrical triangular column (commonly called triangular flap material) is suitable. Further, in order to prevent crushing of the concrete pouring formwork due to internal pressure during concrete pouring, the padding member is provided through a reinforcing member which intersects the padding member at a right angle and straddles a plurality of the padding members. It is preferable to connect them. Also, in order to reduce the number of parts, it is preferable that the reinforcing member also serves as the abutting member that is a cylindrical triangular column. Further, by using a joint so that the end portions of the padding member can be connected to each other at a predetermined angle, it is possible to produce concrete formwork of various shapes.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the concrete formwork according to the present invention will be described below with reference to the drawings. 1 and 2 are exploded perspective views showing components of a concrete formwork according to the present invention.

FIG. 1 shows a rod body 1 such as a long rectangular rod before assembly, panels 8 and 9 made of plywood made of softwood, a pressing member 10, and a pad member 15. The rod 1 is formed with a screw hole 4 which is a fitting hole extending from the front surface 2 to the back surface 3. A convex portion 5 is formed on the front surface 2 and is formed in a step shape. The end faces of the pair of panels 8 and 9 are in contact with the side faces 6 and 7. The pressing member 10 has a cylindrical portion 11 such as a cylindrical portion.
And a flange portion 12 formed integrally with the cylinder portion 11
It consists of A male screw 13 is provided on the outer peripheral surface of the tubular portion 11.
And a female screw 14 is formed on the inner peripheral surface.
For example, the abutting member 15 can be made of a so-called triangular flap material, which is a tubular triangular column having a triangular sectional shape, and at least one surface thereof is formed as a flat surface 16. A groove 17 is formed in the center of the flat surface 16, and the width of the groove 17 is substantially the same as the width of the convex portion 5 of the rod body 1, and the convex portion 5 fits into the groove 17 of the contact member 15. It is formed to fit. Also,
A plurality of holes 18 are formed at predetermined intervals on the top of the contact member 15 on the side facing the groove 17. Patch member 15
The flat surface 16 cooperates with the flange portion 12 of the pressing member 10 to clamp the panels 8 and 9.

FIG. 2 shows the tightening member 19, the tie rod (for example, foam tie) 28, and the claw member 33. The tightening member 19 includes a stopper 20 such as a triangular prism, a screw body 22 such as a threaded cylinder with a flange 21, a seat member 23 placed on the top of the pad member 15 which is a triangular flap material,
It consists of a tightening nut 24. Since the width of the stopper 20 is slightly smaller than the width of the groove 17 of the contact member 15, the stopper 2
0 can be inserted from the groove 17. The screw body 22 and the stopper 20 are assembled by inserting the screw body 22 into the hole formed in the stopper 20. At this time, the flange 21 serves as a stopper. The male screw portion 25 of the screw body 22 can be inserted into the hole 26 of the seat member 23. The angle of the V groove 27 of the seat member 23 is formed to be equal to the apex angle of the contact member 15. The tightening nut 24 is screwed onto the male screw portion 25 of the screw body 22.

The tie rod 28 has a male screw 29 engraved at its tip, and a flange 30 is formed at the end of the male screw 29. A hex head 31 is formed at the opposite end of the tie rod 28. Hole 26 of seat member 23
Is large enough for the hexagonal head 31 to pass through. The flange 30 of the tie rod 28 has a size that can be inserted into a through hole 32 formed in the center of the flange 21.

The claw member 33 has a pair of claws 34 and 35, and the distance between the claw 34 and the claw 35 is equal to the width of the groove 17 of the abutting member 15 which is a triangular flap material. The convex portion 5 of the rod 1 is fitted between the claw 35 and the claw 35. Also,
Since the width of the claw member 33 is smaller than the width of the groove 17 of the contact member 15, the claw member 33 can be inserted from the groove 17. A screw hole 36 is formed in the claw member 33, and the tie rod 2
The male screw 29 of 8 is screwed.

FIG. 3 is a perspective view showing a part of an assembled state of the concrete form. FIG. 4 is a cross-sectional view showing a state cut along a horizontal plane including a chain line XX in FIG. A procedure for assembling a concrete formwork will be described with reference to these drawings.

First, the cylinder portion 11 of the pressing member 10 is fully screwed into the screw hole 4 of the rod body 1 up to the base of the flange portion 12, and the rod body 1 and the pressing member 10 are integrally fixed.
On the other hand, the stopper 20 and the cylindrical screw body 22 are integrally assembled, and the assembled product is assembled into the groove 17 of the contact member 15.
Then, the screw portion 25 of the screw body 22 is inserted into the hole 18 of the contact member 15. Next, the tie rod 28 is inserted from the screw portion 25 side of the screw body 22, the tip of the tie rod 28 is projected from the groove 17 of the contact member 15, and the claw member 33 is screwed into the tip of the tie rod 28. At that time, tie rod 28
Is screwed in such a way that the tip of the blade protrudes from the claw member 33 or does not protrude.

Further, the tie rod 28 is pulled into the contact member 15 so that the claw member 33 does not hit the groove 17, the tie rod 28 is rotated, and the tips of the claws 34 and 35 are brought into contact with the edges of the groove 17. .. The end faces of the pair of panels 8 and 9 are brought into contact with the respective side faces 6 and 7 of the rod body 1 integrated with the holding member 10, and the groove 17 of the abutting member 15 and the claws 34 and 35 of the claw member 33. The convex portion 5 of the rod body 1 is fitted in between. In this state, the tie rod 28 is rotated while being pressed against the edge of the groove 17, and the tie rod 28 is screwed into the female screw 14 of the tubular portion 11 of the pressing member 10. At this time, the convex portion 5 functions as a detent for the claw member 33. Furthermore, the tie rod 28
When the tip of the claw member protrudes from the pressing member 10, the claw member 33 comes into contact with the flange 30 and cannot be screwed any further, and at the same time, the claws 34 and 35 of the claw member 33 are strongly pressed.
The edge of the groove 17 is pressed. In this state, the pair of panels 8 and 9 are clamped and tightened by the flange portion 12 of the pressing member 10 and the flat surface 16 of the contact member 15. And
Through the above procedure, a panel row 38 is formed by sequentially connecting panels using the required number of rods 1.

The above-mentioned panel rows 38 are erected on both sides with a space corresponding to the thickness of the wall to be constructed or constructed (or in some cases, they may be provided horizontally). At that time,
As shown in, the flange portion 12 is arranged so as to be on the inner side. That is, the flange portions 12 are arranged so as to face each other. A separator 39 is provided between the pair of panel rows 38.
And both ends of the separator 39 are connected to the tips of the tie rods 28 protruding from the rear surface of the flange portion 12 via cones 40.

Next, a reinforcing triangular flap material is attached as a reinforcing member 37 which is orthogonal to the padding member 15 holding the panels 8 and 9 and is in contact with the padding members 15 across the plurality of padding members 15. In this example, the pad member 15 is also used as the reinforcing triangular flap material, but the triangular flap material does not have the groove 17 in the flat surface 16, and the plurality of holes 1 are formed on the top and the flat surface.
You may use the triangular flap material which formed 8 at equal intervals.

The attachment of the reinforcing member 37 will be described. In the state where the panels 8 and 9 are continuously provided, the tie rod 28 and the cylindrical screw body 22 project from the top of the abutting member 15. 28 and the screw body 22 are inserted into the holes 18 of the reinforcing member 37. Then, the seat member 23 is fitted into the screw body 22, and the seat member 23 is placed on the top of the reinforcing member 37, and the screw portion 25
Tighten by tightening the tightening nut 24. As a result, it is possible to prevent the panel row 38 from being crushed due to the internal pressure when pouring concrete. Through the steps described above, the concrete pouring formwork is assembled.

When the concrete formwork is assembled in this way, concrete is placed. Concrete is poured into the space between the panel rows 38 arranged to face each other. After pouring the concrete, the concrete is hardened and the concrete formwork is disassembled after curing. That is, the mold rotates the tie rod 28 in the opposite direction to move the tie rod 2
It is removed by removing 8 from the cone 40. At that time, the cone 40 and the separator 39 are left in the concrete, and are visible from the surface of the concrete on which the cone 40 is placed. However, since the circular concave portion is formed by the flange portion 12 on the concrete surface around the cone 40, if necessary, by filling the concave portion with putty or the like, the cone 40 is covered and at the same time the concrete surface is covered. Can be a flat surface.

When concrete is placed in the concrete formwork up to an appropriate height, and then the concrete formwork is mounted again above it, the tie rods 28 are removed from the cone 40 when the wall heights are successively added. At this time, the fixing between the contact member 15 and the reinforcing member 37 is not released. Then, with the formwork and the reinforcing member 37 in the integrated state, the entire formwork is moved upward, and the lower tie rod 28 is screwed onto the upper cone 40 left in the concrete, and further upward. Tie rod 28 through cone 40 to separator 39
You can connect to. Therefore, when the concrete pouring is repeated, the formwork assembling work can be performed very easily and efficiently. Of course, with respect to the movement of the concrete pouring form in the left-right direction, that is, the horizontal direction, and in some cases, the downward direction,
The concrete form can be moved by repeating the same process.

In this concrete form, the panel can be partially removed by removing the pressing member 10 from the rod 1. Therefore, the panel can be partially removed even in the work of pulling out on the wall surface in the work such as electric wiring work before placing concrete, piping work of gas or water, etc., so this kind of work is extremely easy. You will be able to do it. In this embodiment, the pressing member 1
Although the flange portion 12 of 0 has a circular shape, for example, if the width of the flange portion 12 is smaller than the width of the rod body 1 and the length thereof is longer than the width of the rod body 1, the pressing member 10 is rotated by 90 degrees. Since you can partially remove the panel just by doing
This kind of construction becomes easier.

Also, in this embodiment, an example of using a triangular flap material as the abutting member 15 is shown. However, since the triangular flap material has a regular triangular cross section, it is of course excellent in strength. Since it is easy to accumulate, there is an advantage that there is no waste in terms of securing a storage space at a construction site, but what is a cylindrical member having a flat surface 16, and in some cases, a columnar member. However, it may be, for example, a semi-cylindrical column or a square column. Of course, the contact member 15 does not need to have a regular triangular cross section.

Since the concrete formwork according to the present invention is constructed as described above, the panels 8 and 9 can use a plate material having a small area. For example, panel 8,
Various types of plate materials such as plywood manufactured from coniferous wood, waste wood of lauan plywood, iron plate, concrete plate, etc. can be used. Here, an example of manufacturing plywood from a softwood will be described with reference to FIGS. 9 and 10 and FIGS. 11 and 12.
FIG. 9 is a perspective view showing an example of a state before adhesion of a veneer made from softwood, FIG. 10 is a side view of a plywood made from the veneer shown in FIG. 9, and FIG. 11 is a veneer made from softwood. FIG. 12 is a perspective view showing another example of the state before bonding, and FIG. 12 is a side view of a plywood manufactured from the single plate of FIG.

FIG. 9 and FIG. 10 illustrate an embodiment for producing plywood made from softwood. When conifers are cut in the circumferential direction by rotary lace like lauan wood, due to the nature of wood, cracks and the like occur in the wood grain, making it impossible to manufacture thin plate materials. Therefore, a large number of thin plate-shaped single plates 8V are manufactured by cutting a softwood in the longitudinal direction with a saw or the like. Therefore, 1
The single veneer 8V has a narrow width. As shown,
Paper or cloth in which a plurality of these veneers 8V are arranged with the grain directions alternately orthogonally (four in the figure), and an adhesive such as glue is applied to both sides between the veneers 8V. , A sheet 49 of synthetic resin or the like is interposed, and an assembly of the single plate 8V and the sheet 49 is manufactured. Then, this assembly is pressed by a press or the like to manufacture a plywood 8P of softwood.

As described above, in the above-mentioned plywood 8P made of softwood, since the sheet 49 is interposed between the veneers 8V, even if the veneers 8V have many knots, or the veneers 8V have only one piece. Even if only one sheet has a fragile property, each veneer 8V can be sufficiently fixed by the sheet 49 and can sufficiently function as the plate material of the concrete form, that is, the panels 8 and 9.

Further, as described above, when the single plates 8V are successively stacked one by one, the plywood 8P has a small area. Therefore, as shown in FIGS. 11 and 12, a single plate 9V is used.
End faces 9E of each other are brought into contact with each other, a plurality of veneers 9V are arranged on one side to form a composite veneer, and a paper, cloth, synthetic resin, or the like coated with an adhesive such as glue on both sides between each veneer. Sheet 49
Are intervened to produce an assembly of these composite veneers and the sheet 49. Then, this assembly is pressed by a press or the like to manufacture a plywood 9P of softwood. Therefore, if the plywood 9P is manufactured in this manner, the panels 8 and 9 having a large area can be obtained.

The case of constructing a wall has been described above. Next, the case of constructing a main body such as a floor or a beam by concrete pouring will be described. FIG. 5: is sectional drawing which shows an example of the concrete formwork assembled in order to form a floor and a beam. This formwork is an assembly of a concrete placing formwork 41 forming a side wall of a beam, a concrete formwork 42 forming a bottom surface of the beam, and a concrete formwork 43 forming a floor. The structure of the concrete formwork itself is the same as that described with reference to FIGS. 1, 2, 3, and 4, and thus the description thereof is omitted. Although not shown in FIG. 5, a reinforcing member 37 made of a triangular flap may be supported by a pillar from the ground or floor if necessary.

FIG. 6 is an enlarged view of the area Y in FIG. The contact member 15 of the concrete form 41 forming the side surface of the beam and the contact member 15 of the concrete form 43 forming the floor are connected by a joint 44. 7 is a front view of the joint 44, and FIG. 8 is a sectional view taken along line ZZ in FIG. The joint 44 is composed of two triangular prisms having a triangular cross section, that is, cylindrical triangular column parts 45 and 46. That is, the cylindrical triangular support parts 45, 46
In both, the ends are cut at an angle of 45 degrees, for example, and the cut ends are abutted and welded.
Further, the joint 44 is formed with holes 47 and 48 at positions corresponding to the holes of the abutting member 15. By inserting bolts into these holes and tightening them with nuts, two holes are inserted through the joint 44. The contact members 15 can be connected to each other at right angles. At this time, the seat member 23 may be placed and connected to the ridge of the contact member 15, that is, the top.

Further, in the case of the contact member 15 shown in FIG.
There are holes at the top that match the holes 47, 48 of the joint 44, but not at the flat surface 16. Therefore, it is preferable to use a small plate having a hole formed therein, which is welded to the groove 17 of the contact member 15. The joint 44 shown in FIG.
Although it is for connecting the abutting members 15 to each other at a right angle, the angle of cutting the end portions of the cylindrical triangular support portions 45, 46 is not 45 degrees, but is cut at an appropriate angle.
The contact members 15 can be connected to each other at an arbitrary angle.

[0042]

Since the concrete formwork according to the present invention is constructed as described above, it has the following effects. That is, since this concrete formwork is assembled by abutting the end face of a panel made of plywood or the like against a rod body such as a long square rod and sandwiching it with a holding member and a contact member,
You don't have to make holes in the panel. Therefore, the problem that has occurred in the conventional formwork in which the holes are formed in the panel, that is, concrete enters the holes to make it difficult to disassemble the formwork, or the fixing between the formwork and the tie rod is loosened, and the desired product is obtained. There is no problem such as not getting. Moreover,
Conventionally, in the work of removing the old panel from the metal pier and reattaching the new plywood, which had been done in the field in the past, the new panel was scribed at a position that matches the screw hole of the metal pier, and the woodworking was accurately performed at that position. No manual work such as drilling holes is required.

Further, since a large panel which has been forced to be discarded due to its large hole can be cut into small pieces and reused as the panel in the present invention,
It is economically excellent.

In particular, since this concrete formwork can use panels with a small area, plywood made from wood such as conifers can also be used, and even if Lauan plywood becomes thin, it can be used in the future. Can fully respond.

Further, when the reinforcing bars standing between the panels arranged facing each other interfere with the installation of the separator, avoid the reinforcing bars by using panels of different sizes. You can Therefore, also from this point of view, no drilling work is required at the construction site, the risk of electric shock due to rain is eliminated, and a highly safe concrete formwork can be provided.

Furthermore, if the surface of the panel is made uneven, and several kinds of such panels are prepared, an arbitrary pattern can be attached to the wall, paintings, figures, characters, etc. can be made by combining these appropriately. There is also an advantage that it can be expressed.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing components such as a rod member, a panel, a pressing member, and a pad member of a concrete formwork according to the present invention.

FIG. 2 is a tightening member for a concrete formwork according to the present invention,
It is an exploded perspective view showing components, such as a tie rod and a claw member.

FIG. 3 is a perspective view showing an assembled state of the concrete formwork.

4 is a cross-sectional view taken along a horizontal plane including a chain line XX in FIG.

FIG. 5 is a cross-sectional view showing an example of a concrete formwork assembled to form a floor and beams.

FIG. 6 is an enlarged view of a region Y in FIG.

FIG. 7 is a front view showing a joint.

8 is a cross-sectional view taken along the line ZZ in FIG.

FIG. 9 is a perspective view showing an example of a state before adhesion of a veneer manufactured from a softwood.

FIG. 10 is a side view of a plywood manufactured from the single plate shown in FIG.

FIG. 11 is a perspective view showing another example of a state before adhesion of a composite veneer manufactured from a softwood.

12 is a side view of a plywood manufactured from the composite veneer of FIG.

FIG. 13 is an assembled sectional view of a conventional concrete formwork using a metal frame.

FIG. 14 is a plan view of a conventional concrete formwork using a metal frame.

[Explanation of symbols]

 1 bar 4 screw hole 8,9 panel 8V, 9V single plate 8P, 9P plywood 10 pressing member 11 cylinder part 12 flange part 13 male screw 14 female screw 15 abutting member 16 flat surface 19 tightening member 28 tie rod 37 reinforcing member 39 separator 44 joint 49 sheets

Claims (6)

[Claims] 1. A rod member having a fitting hole penetrating therethrough, a holding member having a tubular portion inserted into the fitting hole and a flange portion integrally formed with the tubular portion, and an end face sandwiching the rod member. Panels arranged to face each other, a contact member having a flat surface that cooperates with the flange portion to clamp the panel, and the flange portions of the pressing member fixed to the rod body are spaced apart from each other. A concrete formwork comprising a separator and a tie rod in which the pressing member and the abutting member are tightened by screwing with a screw provided in the tubular portion. 2. The concrete formwork according to claim 1, wherein the panel is a plywood made by stacking a plurality of single plates obtained by cutting a coniferous tree in a longitudinal direction. 3. The concrete formwork according to claim 1, wherein the padding member is a cylindrical triangular column. 4. The concrete formwork according to claim 1, further comprising a reinforcing member that intersects the plurality of pad members arranged in a spaced relationship and fixes the pad member. 5. The concrete formwork according to claim 4, wherein the reinforcing member is a cylindrical triangular column similar to the pad member. 6. The concrete formwork according to claim 1, further comprising a joint that connects the ends of the padding member at a predetermined angle.