JPH05156805A - Formwork device - Google Patents

Abstract

PURPOSE:To assemble a formwork for forming a concrete column whose cross- sectional surface is polygonal easily and strongly without drilling a through hole in respective formwork panels in a factory, and improve adhesive power to reinforcing bars by spreading concrete sufficiently at the time of placing concrete without being interrupted by a spacer member which determines the relative angle between the adjacent panels. CONSTITUTION:Plural formwork panels 1 (1A, 1B, 1C, 1D) which constitute respective pairs are disposed so as to form the respective sides of a polygon and positioned by a panel locking frame 2 which is disposed at the respective corner parts, and stopping bodies 8 which are installed at the panel supporting frame 2 and diagonally positioned are tightened by a wire rope 24 which is disposed in a truss condition. Besides, the respective panels 1 are tight-connected in a condition where displacement force to the inside is applied to the respective panels 1, and the respective inner surfaces of the panels 1 which are adjacent to each other are pressed respectively, and spacer members 25, 26 which determine the contact angle between the panels are protrudingly installed on the respective locking bodies 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a formwork apparatus mainly used in the field of civil engineering / construction for forming pillars and beams of a building having a polygonal cross section by concrete or reinforced concrete. It is about.

[0002]

2. Description of the Related Art A conventional formwork apparatus of this type has been used in such a manner that each constituent member is carried into a building site in a disassembled state and then assembled into a predetermined size and shape at the building site. For example, taking a case of forming a concrete pillar having a rectangular cross section, as shown in FIGS. 24 and 25, four formwork panels 101 (101A, 101B, 101C) at a construction site. , 101
D) is arranged so as to be located on each side of the quadrangular shape, and a pipe-shaped thick piece 102 is abutted on the outer surface of each panel 101, and the panel 101 and the thick piece 102 are in a mutually opposing relationship. Both screw bolts 103 (separators) are spanned over, and the above 101 and 102 are tightened and fixed inward by screwing a tightening member 104 such as a nut. The formwork 105 was assembled by stacking in a plurality of stages to form a concrete placing space of a predetermined size and a predetermined shape.

[0003]

In the conventional formwork apparatus as described above, since both screw bolts (separators) 103 are bridged for fastening and fixing the formwork panel 101 and the like, a through hole is formed in the panel 101. Must be formed, and
Since the formation position of the through hole is not constant and changes depending on the concrete structure to be cast, the through hole must be formed on site. Further, assuming a case where a set of the above four panels 101 is stacked in a plurality of stages to assemble a long formwork, there is no panel support means common to each set, so that the set is firmly assembled before it is brought into the field. It is very difficult to keep it, and even if it is assembled, it may collapse during transportation etc.Therefore, conventionally, there is no choice but to rely on site work for formwork assembly, so it takes time to assemble. It takes a lot of labor, and there is a problem that the cost rise is inevitable.

The present invention has been made to solve the above-mentioned problems, and it is possible to easily and robustly assemble a mold of a predetermined size and shape in advance in a factory or the like, and to use concrete. It is an object of the present invention to provide a formwork device that can freely adjust the relative position and relative angle of adjacent panels without decreasing the adhesive strength of the rebar to the rebar and can firmly hold the angle after adjustment. To do.

[0005]

In order to achieve the above-mentioned object, the formwork apparatus according to the present invention comprises a plurality of formwork panels adjacent to each other arranged so as to be located on each side of a polygon. Fastening a plurality of panel support frames disposed between and supporting the panel from the outside, a locking structure attached to each panel support frame, and the locking structures in a diagonal position of the polygon. Then, the wire ropes that are arranged in the shape of a truss and are tightly connected to each other in a state in which tensile force is applied inward are fastened to the locking structures that are diagonally located on the same plane of the polygon. The rod-shaped bolts that tightly connect the two in an inward tensile force state, and press the inner surfaces of the panels in the adjoining relationship that are held by the locking structures so that they can be moved back and forth by a screwing operation. The relative positions of the panels and It is obtained by a spacer member for holding by adjusting the contact angle.

[0006]

According to the present invention, the set of formwork panels is supported from the outside by the panel support frame, and the diagonal members of the locking structure attached to the panel support frame are the truss-shaped wires. While being fastened with a rope, by fastening rod-like bolts between the locking structures that are diagonally located on the same plane, the wire panels and bolts can also be used to inward the mold panel panels of each set. Since each mold frame panel is tightly bound by applying the displacement force of, it is not necessary to form a through hole in the panel,
It is possible to easily and robustly assemble a mold having a predetermined shape, and thus a prefabricated form can be introduced into the mold assembly.

Particularly, the relative position and the adjacent angle of the adjacent panels can be arbitrarily adjusted by the spacer member projectingly provided on each locking structure and held so as to be able to advance and retreat by the screwing operation. Since a spacer member that presses the inner surface of a certain panel is provided separately for each panel, when the concrete is placed in the formwork, the wrapping of concrete around each spacer member becomes good, Adhesive force between the reinforcing bar and concrete in this vicinity can be made sufficient.

[0008]

Embodiments of the present invention will now be described with reference to the drawings. 1 and 2 are plan views showing assembled formwork devices according to the present invention for columns and beams, respectively.

In the figure, 1 (1A, 1B, 1C, 1
D) is, for example, four formwork panels for forming concrete columns (beams) having a square cross section, and is made of metal such as aluminum, wood, or synthetic resin, and is shown in FIG. As described above, they are arranged at the positions forming the respective sides of the quadrangle. Reference numerals 2 (2A, 2B, 2C, 2D) are four panel support frames arranged between adjacent ones of the panels 1 as uniaxial frames, and these panel support frames 2 have a substantially W-shaped cross section. Has been formed,
As shown in FIG. 4, the ends of the panel 1 are positioned from the outside by both L-shaped portions 2a and 2b in the width direction, and the set of the panels 1 is arranged in a plurality of stages as shown in FIG.
1, F2, F3) are supported so that they can be stacked. Reference numeral 3 is a connecting sheet metal fixed to both ends of each panel support frame 2 in the longitudinal direction by welding or the like, and has a connecting hole 4.

Inside the rectangular corner portions formed of the panels 1, as shown in FIG. 5, among the reinforcing bars 5, 6 surrounded by the panel 1, the main hole 5 is inserted. 7a and an eye nut 8 (8 with a rope engaging hole 7b
A, 8B, 8C, 8D) are provided. Each eye nut 8 has a screw hole 9 on the inner end side 8a as shown in FIGS.
And the screw hole 10 on the outer end side 8b, and processed so that there is a step between the axes of both screw holes 9 and 10. The screw hole 10 on the outer end side of the eyebolt 8 is screwed with the inner end screw portion 13 of the frame fixing rod 12 (12A, 12B, 12C, 12D) penetrating the hole 11 (FIG. 4) of the panel support frame 2. It is worn. On the outer end side of the frame fixing rod 12, as shown in FIG. 9, a substantially W-shaped pad 14 that is in contact with the outer surface of the panel support frame 2,
A metal plate 15 fixed to the outer surface of the pad 14 by welding or the like.
The rod holding member 16 composed of and is inserted into the frame fixing rod 12 by tightening the nut 18 screwed to the outer end threaded portion 17 of the frame fixing rod 12 with a washer 19 or the like. Member 1
It is adapted to be fixed to the panel support frame 2 via 6. These eye nuts 8, frame fixing rod 1
2 and the rod holding member 16 and the like, the locking structure 20
(20A, 20B, 20C, 20D) are configured. Reference numeral 21 is a rod insertion hole formed in the metal plate 15.

In FIGS. 1, 2 and 5, 22 (2
2A, 22B) are the locking structures 20A in the above diagonal relationship.
And 20C, and a pair of rod-shaped bolts as a pair of cross separators for fastening the locking structures 20B and 20D. Both ends of each bolt 22 are respectively screwed into the screw holes 9 at the inner end of the eye nut 8. The screw part 23 which mates is formed. As shown in FIG. 10, the pair of eye nuts 22A and 22C corresponding to the one bolt 22A and the pair of eye nuts 22B and 22D corresponding to the other bolt 22B are arranged such that the step is inverted, and Bolts 22A and 22B are crossed with respect to the horizontal plane S at different levels.

The frame fixing rod 1 as shown in FIG.
Bolt 22 as a cross separator for the axis of 2
If the axes of are arranged at a certain angle,
As the eye nut 8, as shown in FIG. 11, the inner end side 8a and the outer end side 8b may have the same angle with respect to the same axis.

24 (24A, 24B, 24C, 24D)
Is between the next stage of the locking structure 20 in a diagonal relationship,
Specifically, it is a wire rope that is routed in a zigzag shape in the panel stacking direction through the rope locking hole 7 in the eyebolt 8, and is configured as a truss as a whole as shown in FIG. Tightened with tension applied. If necessary, a reinforcing pipe may be inserted into the wire rope 24 to reinforce the shear stress.

A pair of spacer members 25 (2) are provided on the respective locking structures 20 toward the panels 1 which are adjacent to each other.
5A, 25B, 25C, 25D), 26 (26A, 26
B, 26C, 26D) are projected. As shown in FIG. 5, the spacer members 25 and 26 are screwed into the through holes 27 and 28 (FIGS. 6 and 8) formed in the eye nut 8 and fixed to the screw bodies 29, respectively. It is composed of a pusher 30 that is screwed and presses the inner surface of the panel 1 in the adjoining relationship at its tip end surface. By pushing the pusher 30, the amount of advance / retreat from the eye nut 8 side, that is, the amount of press It is configured to adjust to determine the relative position and the adjacent angle of both panels 1.

31 (31A, 31B, 31C, 31D)
Is a push plate that is in contact with each outer surface of the panel 1,
Each push plate 31 has a rectangular frame portion 31 as shown in FIG.
a, a cross-shaped reinforcing portion 31b, and a bottom plate (omitted in this example) provided as necessary, and the like, and a push plate connecting rod 33 is provided in the central screw hole 32 thereof.
(3A, 33B, 33C, 33D) screw portion 3 on the base end side
4 is screwed in and fixed. A P / S nut 36 having a flange portion 36 a is screwed onto the threaded portion 35 on the tip side of the push plate connecting rod 33. Reference numeral 37 is a rectangular push plate connecting fitting having a P / S nut fitting hole 38 and supported by a flange portion 36a of the P / S nut 36,
A hook piece 39 is formed on each side thereof.

Between the hook pieces 39 and the locking holes 40 on the rod holding member 16 side located near the four corners of the panel 1 with which the push plate 31 is in contact, the push plate is provided. Four cords, for example chains 41, which are radially arranged from the tip side of the connecting rod 33 are suspended in a stretched state,
As a result, the push plate 31 is pressed against the panel 1 via the push plate connecting rod 33. The chain 41 may be engaged in any suitable form, such as directly or by using the hook 42 (FIG. 9).

To connect the panel support frame 2 to each other, frame fixing pins 43 having hook-shaped portions 43a and 43b at both ends are prepared as shown in FIGS. It is adapted to be inserted into the connection hole 4 of the connection sheet metal 3.

Next, a method of assembling and manufacturing a mold of a predetermined size and a predetermined shape using the above-mentioned components will be described in the order of steps. First, the first four panels 1A, 1B,
1C and 1D are arranged so as to be positioned on each side of the quadrangle, and these four panels 1A, 1B, 1C and 1D are positioned by the panel support frame 2. And
The sets of the second and third panels 1 are sequentially stacked and supported on the panel support frame 2. On the other hand, an eye nut 8A connected by the rod-shaped bolt 22A,
8C and eye nuts 8B and 8D connected by rod-shaped bolts 22B are passed through main bars 5 having a diagonal relationship. On the other hand, the frame fixing rod 12 having the rod holding member 16 mounted on the outer end side is passed through the hole 11 of each panel support frame 2, and then the inner end screw portion 13 of the outer frame fixing rod 12 is connected to the outer end side of the eye nut 8. The screw 18 is screwed into the screw hole 10, and the nut 18 screwed into the outer end screw portion 17 of the frame fixing rod 12 is appropriately tightened.

In this state, the pressing members 30 of the spacer members 25 and 26 projecting from the eye nut 8 are rotatably operated to press and adjust the inner surfaces of the adjacent panels 1 at their tips to adjust the inner surfaces of both panels 1. Position so that the adjacent angles are constant. Then, the rod-shaped bolts 22A, 2
Rotate 2B to rotate between eye nuts 8A and 8C and 8
Adjust the screwing amount between B and 8D to set the tightened state.

By the way, the screw hole 9 on the inner end side 8a and the outer end side 8b of the eye nut 8 connected by the rod-shaped bolt 22.
If the screw holes 10 of the two are on the same axis, the two rod-shaped bolts 22A and 22B arranged in a cross shape are also located on the same plane, and it is impossible to cross the two 22A and 22B. It will be necessary to adopt a structure in which joint bolts are used for connection. However, as described above, the axial line of the screw hole 9 on the inner end side 8a of the eye nut 8 and the outer end side 8a
Since the axial lines of the screw holes 10 of b are stepped with respect to each other, the eye nuts 8A and 8C used in one diagonal relationship to the eye nuts 8B and 8D used in the other diagonal relationship.
10, the rod-shaped bolts 22A and 22B are staggered without causing complication of the structure due to the introduction of the cruciform joint bolt and the like by mounting in an inverted posture in the step direction (thickness direction) as shown in FIG. Can be arranged in a cross shape. In this case, the step size of the eye nut 8 may be a value equal to or larger than the radius of the bolt 22.

After positioning the panels 1 in the adjoining relationship, the nuts 18 screwed to the front and rear frame fixing rods 12 are finally tightened to tighten the frame fixing rods 12.
And the panel support frame 2 are firmly integrated.

At this time, the wire ropes 24 are passed through the respective rope engaging holes 7b of the eye nuts 8 which are diagonal to each other, and are stretched in a zigzag shape in the panel stacking direction as shown in FIG. Then, it is configured as a truss shape as a whole. As a result, an inward displacement force is applied to each panel 1 by the tensile force of the wire rope 24 and the panels 1 are tightly connected to each other to form the form 80.

Further, with the push plate 31 to which the push plate connecting rod 33 is screwed and fixed is brought into contact with each outer surface of each panel 1, a push plate connecting metal fitting mounted on the tip side of the push plate connecting rod 33. Chains 41 are hung between the rods 37 and the rod holding members 16 located at the four corners of each panel 1 as shown in FIG. Thereby, the mold 80 having high strength is constructed.

By carrying out the above steps in a factory or the like, the assembly of the predetermined mold 80 is completed. The formwork 80 thus assembled is loaded on a truck or the like, carried into a construction site, and then installed in a predetermined place.
Then, a predetermined concrete structure is constructed by placing concrete in the built-in mold 80 and solidifying it.

Here, the panel 1 is tightly connected to form 2
In the case of configuring 0, since the locking structures 17 attached to the panel support frame 2 may be fastened together by the wire rope 18, it is not necessary to form a through hole or the like in the panel 1, and the number of times of diversion use can be reduced. You can increase.
Further, since the set of four panels 1 is stacked and supported by the panel support frame 2 in the three stages F1, F2, F3, the assembling work is simplified and the labor on site can be reduced. Moreover, since the assembly formwork can be configured to be sturdy as described above, it is suitable for adopting a prefabricated form for carrying in from the factory to the site, and while reducing the overall bulk, it is suitable for transportation. It is possible to prevent deformation and collapse.

If, for example, a disk-shaped member is used to position the adjoining angles of the panels 1 in the adjoining relationship, when the concrete is placed in the formwork, the disk-shaped member will be concrete. It acts as a baffle against the wraparound, and there is a risk that the adhesion of the concrete to the main bar 5 will be reduced around the back surface of this member. However, as shown in the above-mentioned embodiment, the spacer members 25, 26 having the pressing element 30 and projecting from the locking structure 20 are provided.
By configuring so that the adjacent angles of both panels 1 are separately determined, it is possible to cause the concrete to wrap around every corner without being disturbed by the spacer members 25 and 26 when pouring concrete. Therefore, the main reinforcement 5 of the concrete around the spacer members 25 and 26
It is possible to secure the strength of the concrete product by sufficiently increasing the adhesion force to the concrete product.

Further, when pouring the concrete, an outward pressure F is applied to the inner surface of the panel 1 as shown in FIG. 14, so generally, a thick piece or the like is applied to the panel 1. Although the strength for receiving the above-mentioned pressure F is given, in that case, it becomes necessary to make a hole in the panel 1 by a fixing means such as a thick material, which again limits the diversion use of the panel 1. On the other hand, in the above-described embodiment, as shown in FIG. 13 and FIG. 14, the push plate connecting metal fitting 3 at the tip of the push plate connecting rod 33 standing on the push plate 31 is provided.
Since the four chains 41 are stretched between the 7 side and the rod holding members 16 corresponding to the four corners of the panel 1, the pressure F applied to the inner surface of the panel 1 is pushed. The plate F is dispersed in four directions by the four chains 41 via the push plate 31 and the push plate connecting rod 33. As a result, stress concentration is avoided and mechanical strength is maintained appropriately. Therefore, it is not necessary to separately use a thick edge material and the like, and the panel 1 can be used without being deformed and can be diverted and used, and the weight can be reduced.

As the above-mentioned cord, other members such as a wire rope can be used in addition to the chain 41.
The use of No. 1 has the advantage that the tension length can be freely adjusted, in other words, the adjustment allowance can be increased.

When the casting of the concrete is completed, the chain 41 is removed and the push plate 31 is removed, while the nut 18 is loosened and the frame fixing rod 15 is removed from the eye-up 8, whereby the panel 1 is removed. It is disassembled together with the support frame 2. At this time, the formwork panel 1 is
It may be reused after the concrete is hardened, or it may be reused by making the formwork panel 1 a decorative panel such as a wood wool concrete plate, which may reduce the time and effort required to remove the mold after the concrete is hardened. It may be possible to omit the laying of the decorative panel after hardening the concrete.

By the way, in the above-mentioned embodiments, the concrete columns are constructed. However, by using in combination with the formwork device for the beam shown in FIG. 2, all the floor beams shown in FIG. 18 and FIG. A formwork device for the single floor beam shown can be constructed.

In order to apply the formwork device to the corner portion where the pillar and the beam are connected, as a panel supporting frame material, as shown in FIG.
In addition to the panel support frame 2 as the uniaxial frame shown in FIG. 3, three types of corner frames having a cross sectional shape congruent with the panel support frame 2 are prepared as shown in FIGS.

That is, in FIG. 20, reference numeral 51 denotes a corner frame biaxial direction corner frame as a corner frame, and two frame pieces 5 having a substantially W-shaped cross section and orthogonal to each other.
1a and 51b are provided, and a connecting sheet metal 13 having a connecting hole 4 is fixed to each end by welding or the like. Further, in FIG. 21, reference numeral 52 denotes a three-axis direction corner frame as a corner frame for entering corners, and three frame pieces 52a, 52b, 52 having a substantially W-shaped cross section and orthogonal to each other.
A connecting sheet metal 3 having a connecting hole 4 is fixed to each end portion. In FIG. 22, reference numeral 53 denotes a three-axis direction corner frame for a corner as a corner frame, which has three frame pieces 53a, 53b, 53c having a substantially W-shaped cross section and orthogonal to each other. The connecting sheet metal 3 having the connecting holes 4 is fixed. Regarding the panel support frame 2 as well, in addition to the above-mentioned ones, those having different lengths are used as shown in FIG. 23, such as a joint frame 62, a beam adjusting frame 63, a column adjusting frame 64, a joint adjusting frame 65, and a beam joint frame 66. Be prepared as.

FIG. 23 shows an example of assembling and using each of the above-mentioned frames. The column P1, the panel support frame 2,
The column adjustment frame 64, the joint adjustment frame 65, etc. are used. The panel support frame 2 and the pillar adjustment frame 64 can be connected with one touch using the fixing pin 43 shown in FIGS. At the corner portion with the pillar P1 by the beam joint frame 66, the joint frame 62, the beam adjusting frame 63, etc., the triaxial corner frame 53 is used for the projecting corner, and the biaxial corner frame 51 is used for the entering corner. To be done. In addition, in the upper corner portion of the pillar P2,
A triaxial corner frame 52 is used for the corner entry. For the other corners, each frame may be similarly selected and assembled.

In this case, the molds for the corners of the pillars and beams can be constructed by simply making three types of corner frames 50 having the same cross-sectional shape as the panel support frame 2, so that the above-mentioned prefabricated form can be readily accommodated. At the same time, parts management becomes easier.

In the above embodiment, the set of panels 1 has a plurality of stages as shown in FIG. 3, for example, three stages (F1, F2, F).
Although a large formwork device that is stacked and supported in 3) has been described, the set of panels 1 may be used in only one stage. In addition, the panel 1 may be a steel panel or a decorative panel such as a wood wool cement board.

[0036]

As described above, according to the present invention, a plurality of formwork panels are respectively positioned by the panel support frames arranged outside the corners between the adjacent panels, and are attached to the panel support frames. Then, the locking structures at diagonal positions are fastened with wire ropes arranged in a truss shape, while the locking structures that are in the diagonal relationship are connected by rod-shaped bolts so that each pair of panels can be connected together. Since it is tightened by applying an inward displacement force, it is possible to form a through hole that does not require concrete leakage treatment on the panel.
It is possible to easily assemble a sturdy mold having a predetermined size and a predetermined shape, which is not deformed or collapsed even when subjected to rough handling, in a factory or the like. Therefore, the prefabricated form can be introduced into the assembling of the mold, that is, the manufacturing, so that the on-site work can be rationalized, the labor can be saved, and the cost can be reduced. Further, since it is not necessary to form a through hole in the panel, the work for that is not necessary, and the labor and efficiency of the site work can be further promoted. Particularly, since the spacer member for adjusting the adjoining angle of both panels to a predetermined angle by pressing the inner surfaces of the adjoining panels separately, is projected on the engaging structure, the relative position and angle of the adjoining panels are The spacer member can be arbitrarily adjusted and the adjustment angle can be firmly held, but when the concrete is placed, the wraparound of the concrete is relatively less hindered by the spacer member. The strength of the produced concrete can be effectively exhibited by sufficiently increasing the adhesive force between the concrete and the reinforcing bars in the surrounding area.

[Brief description of drawings]

FIG. 1 is a plan view showing a formwork apparatus according to an embodiment of the present invention.

FIG. 2 is a plan view showing an example in which the same frame device is assembled for a beam.

FIG. 3 is an explanatory diagram showing a state in which a plurality of panel sets are stacked in a plurality of stages by a panel support frame.

FIG. 4 is a perspective view showing a panel support frame.

FIG. 5 is a plan view showing a peripheral portion of a locking structure.

FIG. 6 is a plan view showing an eye nut in a locking structure.

FIG. 7 is a front sectional view showing an eye nut.

FIG. 8 is a right side view showing the eye nut.

FIG. 9 is an exploded perspective view showing a rod holding member.

FIG. 10 is an explanatory diagram of a connection relationship between an eye nut and a rod-shaped bolt.

11 is a plan view showing an eye nut used in the one shown in FIG. 2. FIG.

FIG. 12 is a diagram schematically showing a stretched state of the wire rope between the locking structures.

FIG. 13 is an exploded perspective view showing the periphery of a push plate.

FIG. 14 is an explanatory diagram of a tensioned state of a chain between the tip end side of the push plate connecting rod and the rod holding member side.

FIG. 15 is a rear view showing a fixing pin for connecting frames.

FIG. 16 is a front view showing a fixing pin.

FIG. 17 is a side view showing a fixing pin.

FIG. 18 is a diagram showing the form device applied to all floor beams.

FIG. 19 is a view showing the formwork device applied to a single-story beam.

FIG. 20 is a perspective view showing a biaxial direction corner frame for entering corners as one of the corner frames.

FIG. 21 is a perspective view showing an in-corner triaxial corner frame as one of the corner frames.

FIG. 22 is a perspective view showing a corner frame triaxial direction corner frame as one of the corner frames.

FIG. 23 is a perspective view showing an example of assembling and using each frame.

FIG. 24 is a side view showing a conventional formwork apparatus.

FIG. 25 is a plan view of that of FIG. 24.

[Explanation of symbols]

1A, 1B, 1C, 1D Form panel 2A, 2B, 2C, 2D, 62, 63, 64, 65, 6
6 Panel support frame 20A, 20B, 20C, 20D Locking structure 22A, 22B Rod-shaped bolt 24A, 24B, 24C, 24D Wire rope 25A, 25B, 25C, 25D, 26A, 26B, 2
6C, 26D spacer member

Claims (1)

[Claims] 1. A plurality of panel support frames which are arranged between adjacent ones of a plurality of formwork panels arranged so as to be located on each side of a polygon and which support the panels from the outside. The locking structure attached to each panel support frame is arranged in a truss shape so as to fasten the locking structures at diagonal positions of the polygon, and a tensile force is applied inward to each panel. Wire rope to be tightly connected in a state, rod-like bolts to fasten each panel to each other by fastening the diagonally opposite locking structure members on the same plane of polygon, and the above-mentioned, And a spacer member that is held by each locking structure so as to be able to advance and retreat by a screwing operation and that presses the inner surfaces of the above-mentioned adjoining panels separately to adjust and hold the relative position and adjoining angle of the panels. Characterized by Formwork device to do.