Formwork forming unit

Abstract

To provide a frame mold forming unit capable of simplifying work in forming the frame mold at a work site.SOLUTION: A frame mold forming unit 1 comprises a frame mold panel 2, a steel bar for reinforcement 4, a separator 6 and clips 8, 9. The separator 6 comprises a rod-like body part and a folding part 21 provided at its both ends and engaged with the steel bar for reinforcement 4 or a frame body 10 of the frame mold panel 2. The folding part 21 comprises a circulation part circulating around the steel bar for reinforcement 4 or the frame body 10 following the rod-like body part, and an extension part extending from an end of the circulation part in a direction of the rod-like body part. A stopper part is provided between the rod-like body part and the circulation part and between the circulation part and the extension part, and the clips 8, 9 are engaged with the circulation part of the folding part 21.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a formwork forming unit used when forming a concrete form that serves as the foundation of a building or the like. [Background technology]

[0002] In a formwork forming unit used when forming a concrete mold that serves as the foundation for a building, etc., formwork panels are erected parallel to each other at a specified interval, and a space for pouring concrete is formed between these formwork panels. Here, in order to maintain a constant distance between the form panels against the lateral pressure of the concrete poured between the form panels, a separator is arranged spanning the space between the opposing form panels (see Patent Document 1 below). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 10-1952 Summary of the Invention [Problem to be solved by the invention]

[0004] As a method for connecting the separator to the form panel, Patent Document 1 discloses a method in which a round bar-shaped separator with a male thread formed at the end, a hook-shaped member provided separately, and a pair of nuts are used to clamp and fix the reinforcing steel bar held by the hook-shaped member and the form panel with the pair of nuts screwed onto the male thread of the separator. However, this method requires a large number of parts and the fixing work is complicated. Another known method is to engage a hook portion formed at the end of the separator with a reinforcing steel bar joined to the form panel, and then use a special tool to crimp the engaged portion, but crimping using a special tool places a heavy burden on the worker. SUMMARY OF THE PRESENT EMBODIMENT In view of the above circumstances, an object of the present invention is to provide a formwork forming unit that can simplify the work involved in forming a formwork on-site. [Means for solving the problem]

[0005] As a result of extensive investigations aimed at solving the above problems, the present inventors have arrived at the present invention as described below. The formwork forming unit according to the first aspect of the present invention is defined as follows: A form forming unit comprising a form panel, a reinforcing bar, a separator and a clip, The separator includes a rod-shaped main body and folded-back portions provided at both ends thereof and engaged with the reinforcing steel bars or the frame body of the form panel, The folded portion includes a circumferential portion that is continuous with the rod-shaped main body portion and circumferentially surrounds the reinforcing steel bar or the frame body, and an extension portion that extends from an end of the circumferential portion toward the rod-shaped main body portion, A retaining portion is provided between the rod-shaped main body portion and the circumferential portion and / or between the circumferential portion and the extension portion, The clip engages the circumferential portion of the folded portion.

[0006] The form forming unit of the first aspect thus defined ensures the engagement between the separator and the reinforcing steel bar or the frame of the form panel by engaging the clip with the circumferential portion of the folded-back portion, and can eliminate the need for the conventional work of crimping and fixing the engagement portion using a special tool. Here, according to the first aspect, since the retaining portion is provided between the circumferential portion and the rod-shaped main body portion and / or between the circumferential portion and the extension portion, it is possible to prevent the clip engaged with the circumferential portion from coming off the circumferential portion, and as a result, the engagement between the separator and the reinforcing steel bar or the frame of the form panel is also maintained.

[0007] The second aspect of the present invention is defined as follows: In the formwork forming unit specified in the first aspect, the circumferential portion is formed with a narrow portion that is narrower than the rod-shaped main body portion and / or the extension portion when viewed from a direction perpendicular to the axis of the rod-shaped main body portion, and a step is formed at the boundary between the narrow portion and the rod-shaped main body portion and / or the extension portion to prevent the clip from slipping out. With the second formwork forming unit defined in this manner, the clip can be easily inserted into the narrow portion of the circumferential portion, and the step formed at the boundary of the narrow portion can prevent the clip from falling out of the circumferential portion.

[0008] Here, the narrow width portion can be formed in a portion of the circumferential portion that continues to the rod-shaped main body portion and a portion that continues to the extension portion (third aspect).

[0009] Furthermore, according to a fourth aspect of the present invention, in the formwork forming unit specified in the third aspect, the narrow width portion can be formed in the portion continuing from the rod-shaped main body portion up to the portion that reaches outside beyond the reinforcing bar that engages with the folded-back portion or the frame body of the formwork panel.

[0010] Here, the outer edge forming the boundary on the circumferential portion side of the narrow portion formed in the portion continuing from the rod-shaped main body portion is tapered so as to move away from the rod-shaped main body portion toward the outside of the circumferential portion, so that the clip can be easily inserted into the circumferential portion even from an oblique direction (fifth aspect).

[0011] The sixth aspect of the present invention is defined as follows: In the form forming unit defined in any one of the first to fifth aspects, the clip has a head and a pair of legs, and the pair of legs are engaged with the circumferential portion so as to sandwich the circumferential portion.

[0012] Here, by combining with the step defined in the second aspect, the pair of legs, in a state of being engaged with the circumferential portion, interfere with the step and are prevented from coming off (seventh aspect).

[0013] The eighth aspect of the present invention is defined as follows: In the formwork forming unit defined in the sixth or seventh aspect, the pair of legs are provided with anti-slip portions that protrude from inner surfaces facing each other and engage with the circumferential portion. In this way, the retaining effect can be exerted in a direction different from the retaining direction defined in the first aspect.

[0014] The ninth aspect of the present invention is defined as follows: In the form forming unit defined in any one of the first to eighth aspects, a finger grip is formed on a head of the clip. This improves the ease of inserting the clip into the circumferential portion of the separator disposed in the middle or lower section of the form panel, which is difficult for the worker to reach. [Brief description of the drawings]

[0015] [Figure 1] FIG. 1 is a perspective view of a form formed by a form forming unit according to one embodiment of the present invention. [Diagram 2] FIG. 2 shows a separator in the formwork forming unit of the embodiment, where FIG. 2(A) is a plan view and FIG. 2(B) is a side view. [Diagram 3] FIG. 3 shows a clip in the formwork forming unit of the embodiment, where FIG. 3(A) is a perspective view, FIG. 3(B) is a front view, and FIG. 3(C) is a side view. [Figure 4] 4(A) is a diagram showing a state in which the separator is connected to a form panel using the clip of FIG. 3, and FIG. 4(B) is a cross-sectional view taken along the line BB of FIG. 4(A). [Diagram 5] FIG. 5 shows a clip different from that shown in FIG. 3, where FIG. 5(A) is a perspective view, FIG. 5(B) is a front view, and FIG. 5(C) is a side view. [Figure 6] FIG. 6(A) is a view showing a state in which the separator is connected to a form panel using the clip of FIG. 5, and FIG. 6(B) is a view seen in the direction of the arrow BB in FIG. 6(A). [Figure 7]FIG. 7 shows a mounting state of a clip different from that shown in FIG. [Figure 8] FIG. 8 is a view showing a modification of the clip of FIG. [Figure 9] FIG. 9 is a diagram showing a modification of the clip in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0017] 1 is a perspective view of a form formed by a form forming unit 1 according to one embodiment of the present invention. As shown in the figure, the form forming unit 1 includes a form panel 2, a reinforcing steel bar 4, a separator 6, and clips 8 and 9. A form is formed by appropriately combining these parts, and a concrete mold is formed by pouring concrete into the form and allowing it to harden.

[0018] As shown in Fig. 1, the form panels 2 are arranged opposite each other with a predetermined distance between them. A concrete molding space 3 is formed between the pair of form panels 2, 2 arranged opposite each other. The form panel 2 is configured by fixing a metal mesh body 12 to a frame body 10 formed by combining predetermined reinforcing bars in a square shape and welding them together, so as to cover the frame surface. The mesh body 12 is made of a mesh-like wire material such as metal lath, and surrounds the molding space 3 to prevent the concrete from flowing out before hardening. The mesh body 12 is formed to be about the same size as the frame body 10, and is fixed to the frame body 10 by welding or the like.

[0019] In addition, in the form panel 2, reinforcing steel bars 4 for increasing the strength are fixed to the frame body 10 in a form extending vertically and horizontally in the figure. A plurality of reinforcing steel bars 4 can be provided at predetermined intervals on the frame body 10.

[0020] In forming the formwork, as shown in FIG. 1, the reinforcing bars 4 extending laterally and engaged with the separators 6 are faced outward, and the side edges of the frame bodies 10 of adjacent formwork panels 2, 2 are tied together by wrapping a binding wire 14 around them.

[0021] The separator 6 is used to maintain the strength of the formwork and to keep the width between the pair of opposing form panels 2, 2 constant, and is disposed across the pair of opposing form panels 2, 2. The separator 6 has the role of withstanding the lateral pressure generated when concrete is poured into the concrete molding space 3 and preventing the form panels 2 from bulging outward. The length of the separator 6 is formed to a required length according to the distance between the opposing form panels 2, 2.

[0022] The separator 6 of this embodiment is made of a rod-shaped reinforcing bar, and as shown in FIG. 2, includes a rod-shaped main body 20 and a first folded portion 21 and a second folded portion 22 provided on both ends thereof.

[0023] These folded parts 21, 22 are portions that engage with the reinforcing steel bars 4 or the frame body 10 of the form panel 2 (hereinafter, sometimes referred to as the reinforcing steel bars 4, etc.). The folded parts 21, 22 are continuous with the rod-shaped main body 20 and include a wrapping part 23 that wraps around the reinforcing steel bars 4, etc., and an extension part 24 that extends from the end of the wrapping part 23 toward the rod-shaped main body 20. The folded parts 21, 22 provided at both ends are formed so that the central axes of the respective folded parts are located within the same imaginary plane.

[0024] In the separator 6 of this embodiment, the winding portion 23 has a base end portion 23a, which is a portion continuing to the rod-shaped main body portion 20, and a tip end portion 23c, which is a portion continuing to the extension portion 24, connected via a curved portion 23b formed in a curved shape. However, the shape of the winding portion 23 is not limited to this, and for example, it is also possible to provide a straight portion instead of the curved portion 23b to make the winding portion 23 approximately U-shaped.

[0025] A narrow width portion 25 is formed at the base end portion 23a of the circumferential portion 23 of the first folded portion 21. When viewed in a direction perpendicular to the central axis of the rod-shaped main body 20 and from a direction in which the rod-shaped main body 20 and the extension portion 24 overlap, i.e., in the plan view shown in Fig. 2(A), the narrow width portion 25 is narrower than the rod-shaped main body 20, and a step 26 is formed at the boundary between the narrow width portion 25 and the rod-shaped main body 20. This step 26 constitutes a stopper portion that interferes with an engaged clip to restrict movement of the clip. Focusing on the circumferential portion 23 side of the narrow portion 25, as shown in Fig. 2(B), the narrow portion 25 is formed up to a portion that reaches the outside beyond the engaging reinforcing steel bars 4, etc. Then, a step 27 is formed as an outer edge at the boundary of the narrow portion 25 on the circumferential portion 23 side. The step 27 is formed in a tapered shape that moves away from the rod-shaped main body portion 20 as it moves toward the outside of the circumferential portion 23, making it possible to insert the clip from an oblique direction.

[0026] A narrow width portion 29 is formed at the tip portion 23c of the circumferential portion 23 of the first folded portion 21. This narrow width portion 29 is narrower than the extended portion 24 in the plan view shown in Fig. 2(A), and a step 30 is formed at the boundary between this narrow width portion 29 and the extended portion 24, as shown in Fig. 2(B). This step 30 also constitutes a slip-out prevention portion that interferes with the engaged clip and restricts the movement of the clip.

[0027] In addition, in the separator 6 of this example, no narrow width portion is provided on the side of the second folded portion 22. In the second folded portion 22, the extension portion 24 is lengthened to make it difficult for the second folded portion 22 to come out of engagement with the reinforcing steel bars 4 or the like. In some cases, it is also possible to provide a narrow width portion similar to the first folded portion 21 on the side of the second folded portion 22.

[0028] Next, a description will be given of the clips 8, 9 that engage with the first folded portion 21 of the separator 6. As shown in Fig. 4(A), for example, the clips 8, 9 engage with the circumferential portion 23 of the folded portion 21 on the rod-shaped main body portion 20 side rather than the reinforcing steel bars 4, etc., and prevent the separator 6 from unintentionally disengaging from the reinforcing steel bars 4, etc. The form forming unit 1 of this example includes clips 8 used on the upper stage side of the form panel 2, and clips 9 used on the middle and lower stages of the form panel 2.

[0029] FIG. 3 shows a clip 8 used on the upper side of the formwork panel 2. As shown in FIG. The clip 8 is made of resin, and as shown in the figure, includes a pair of legs 40, 40 and a head 41 connecting the legs 40, 40. The pair of legs 40, 40 are disposed opposite each other with a gap S therebetween as an accommodation space for accommodating the narrow width portions 25, 29 of the separator 6, and the shapes of the legs 40 are mirror symmetrical.

[0030] The leg 40 is generally rectangular prism-shaped, and a first step 43 as a retaining portion is formed on the base end side (head 41 side) of the inner surface 42 facing the other leg 40, and a second step 45 as a retaining portion is formed on the tip side of the first step 43. Further to the tip side of the second step 45, as shown in Fig. 3(B), a tapered surface 42a is formed such that the thickness of the leg becomes thinner (the gap S becomes larger) as it approaches the tip.

[0031] 4 is a diagram showing a state in which the separator 6 is connected to the form panel 2 using the clip 8. In detail, after the first folded portion 21 formed on the separator 6 is engaged with the reinforcing steel bars 4 or the like, the clip 8 is inserted from the inside of the form panel 2 (the molding space 3 side) toward the narrow width portions 25, 29 formed on the circumferential portion 23 of the separator 6, and the clip 8 is engaged so as to sandwich the narrow width portions 25, 29 with a pair of legs 40, 40.

[0032] In this state, left-right movement of the clip 8 in Fig. 4(A) is restricted by interference between the outer surface 48 of the clip 8 and the steps 26 and 30 of the separator 6, and up-down movement of the clip 8 in Fig. 4(B) is restricted by interference between the steps 43, 45 of the clip 8 and the narrow width portions 25, 29 of the separator 6. This makes it possible to prevent the clip 8 engaged with the circumferential portion 23 from coming off the circumferential portion 23, and as a result, the engagement between the separator 6 and the reinforcing steel bars 4 or the like is maintained.

[0033] 5 is a diagram showing a clip 9 used on the middle and lower sides of the form panel 2. In this clip 9, a ring-shaped finger hook 50 having an inverted trapezoidal shape with a longer upper side when viewed from the front is formed on the head 41, and the overall length (height) of the clip 9 is longer than that of the clip 8. In addition, tapered surfaces 48a, 51a are formed on the outer surfaces 48, 51 at the tip side of the leg 40 so that the thickness of the leg 40 becomes thinner. The other shapes are basically the same as the clip 8 described above.

[0034] 6 is a diagram showing a state in which the separator 6 is connected to the form panel 2 using the clip 9. In detail, after the first folded portion 21 formed on the separator 6 is engaged with the reinforcing steel bar 4 or the like, the clip 9 is inserted obliquely downward from the outside of the form panel 2 toward the narrow width portions 25, 29 formed on the circumferential portion 23 of the separator 6, and the clip 9 is engaged so as to sandwich the narrow width portions 25, 29 between a pair of legs 40, 40. Since the tips of the legs 40 of the clip 9 are formed thin, it is suitable for passing through the openings of the mesh body 12 by inserting the clip obliquely downward from the outside.

[0035] In this state, left-right movement of the clip 9 in Fig. 6(A) is restricted by interference between the outer surface 48 of the clip 9 and the steps 27 and 30 of the separator 6, and up-down movement of the clip 9 in Fig. 6(B) is restricted by interference between the steps 43, 45 of the clip 9 and the narrow portions 25, 29 of the separator 6. This makes it possible to prevent the clip 9 engaged with the circumferential portion 23 from coming off the circumferential portion 23, and as a result, the engagement between the separator 6 and the reinforcing steel bars 4 or the like is maintained.

[0036] In addition, the clips 9 used on the middle and lower sides of the formwork panel 2 can also be inserted downward from the inside of the formwork panel 2 into the narrow portions 25, 29 of the separator 6 and engaged with the circumferential portion 23 of the separator 6, as shown in Figure 7.

[0037] Next, a method of forming a form using the form forming unit 1 will be described with reference to Fig. 1. First, a plurality of form panels 2 are erected while being connected in the horizontal direction along a marking line drawn on the upper part of the basing concrete (not shown). More specifically, a predetermined bundling wire 14 is wound around the side edges of the frame bodies 10, 10 of the adjacent form panels 2, 2 to bind them together, with the reinforcing steel bars 4 extending in the horizontal direction to be engaged with the separator 6 facing outward. Then, the separator 6 is disposed at a predetermined position so as to straddle the opposing form panels 2, 2 (at this time, a slit-shaped opening through which the separator 6 can be inserted can be formed in the mesh body 12, if necessary).

[0038] Then, the second folded portion 22 is engaged with the reinforcing steel bars 4 etc. located at the rear side, and thereafter the first folded portion 21 is engaged with the reinforcing steel bars 4 etc. of the form panel 2 on the front side. Next, the clip 8 is inserted downward from the inside of the form panel 2 into the first folded portion 21 of the separator 6 arranged on the upper side of the form panel 2, and the clip 8 is engaged with the circumferential portion 23 of the separator 6. In addition, a clip 9 is inserted obliquely downward from the outside of the form panel 2 (or downward from the inside of the form panel 2) into the first folded portion 21 of the separator 6 arranged on the middle or lower side of the form panel 2, and the clip 9 is engaged with the circumferential portion 23 of the separator 6. In this way, the formwork forming unit 1 can be used to form a formwork of a predetermined shape.

[0039] As described above, in the form forming unit 1 of this embodiment, the engagement between the separator 6 and the reinforcing steel bar 4 or the frame body 10 of the form panel 2 is ensured by engaging the clip 8 or 9 with the circumferential portion 23 of the first folded portion 21, and the work of crimping and fixing the engagement portion using a dedicated tool, which was conventionally performed, is unnecessary. Here, according to the form forming unit 1, the steps 26 and 30 are provided as stoppers between the circumferential portion 23 and the rod-shaped main body portion 20 and between the circumferential portion 23 and the extension portion 24, so that the clip 8 or 9 engaged with the circumferential portion 23 can be prevented from coming off the circumferential portion 23, and as a result, the engagement between the separator 6 and the reinforcing steel bar 4 or the frame body 10 of the form panel 2 is also maintained.

[0040] In the form forming unit 1 of this embodiment, the circumferential portion 23 is formed with a narrow portion 25 narrower than the rod-shaped main body portion 20 and a narrow portion 29 narrower than the extension portion 24, allowing the clip 8 or 9 to be easily inserted. In addition, the step 26 formed at the boundary between the narrow portion 25 and the rod-shaped main body portion 20 and the step 30 formed at the boundary between the narrow portion 29 and the extension portion 24 can prevent the clip 8 or 9 from slipping out of the circumferential portion 23.

[0041] In the formwork forming unit 1 of this embodiment, the outer edge 27 that forms the boundary on the circumferential portion 23 side of the narrow width portion 25 formed in the portion continuing from the rod-shaped main body portion 20 is formed in a tapered shape that moves away from the rod-shaped main body portion 20 as it moves toward the outside of the circumferential portion 23, so that the clip 9 can be easily inserted into the circumferential portion 23 even from an oblique direction.

[0042] In the formwork forming unit 1 of this embodiment, the clip 8 or 9 has a head 41 and a pair of legs 40, 40, and the pair of legs 40, 40 are configured to engage with the circumferential portion 23 so as to sandwich the circumferential portion 23, and when the pair of legs 40, 40 are engaged with the circumferential portion 23, they interfere with the steps 26, 30 and are prevented from coming out, thereby preventing movement of the rod-shaped main body portion 20 of the clip 8 or 9 along the axial direction.

[0043] In addition, the pair of legs 40, 40 are formed with anti-slip portions 43, 45 that protrude from the opposing inner surfaces 42 and engage with the circumferential portion 23, thereby preventing movement of the rod-shaped main body portion 20 of the clip 8 or 9 in the direction perpendicular to the axis.

[0044] In the formwork forming unit 1 of this embodiment, a finger grip portion 50 is formed on the head 41 of the clip 9, thereby improving workability when inserting the clip 9 into the circumferential portion 23 of the separator 6 arranged on the middle or lower side of the formwork panel 2, which is difficult for an operator to reach.

[0045] Although the embodiments of the present invention have been described in detail above, the present invention is not limited to these descriptions. Various modifications that do not deviate from the scope of the claims and that can be easily conceived by a person skilled in the art are also included in the present invention.

[0046] For example, it is possible to engage a separator with a reinforcing steel bar extending in the vertical direction, and to engage a clip with a circumferential portion of the separator. In addition, while the above embodiment is an example in which a separator is engaged with a reinforcing steel bar that has been welded to the form panel in advance, it is also possible to separately arrange a reinforcing steel bar that is not welded to the form panel on the outside, engage a separator with this reinforcing steel bar, and engage a clip with the circumferential portion of the separator.

[0047] As shown in Figures 8 and 9, the shape of the clip can be changed as appropriate. For example, as shown in the examples of Figures 8B to 8D, the inner surface 42 of the leg 40 may have only one step. Also, as shown in the examples of Figures 8C and 8D, it is also possible to adopt a configuration in which no tapered surface is provided at the tip of the leg 40. Also, as shown in the example of Figure 9, the finger hook 50 provided on the head 41 of the clip can be not only trapezoidal, but also circular or horizontally long rod-shaped. [Explanation of symbols]

[0048] 1...Formwork forming unit 2…Formwork panel 4…Reinforcing steel bars 6…Separator 8, 9…Clip 20... Rod-shaped main body 21...First folded part 23…Circuit section 23a...Proximal end part 23c…Tip part 24...Extension part 25, 29...Narrow part 26, 30...Step (stop part) 27…Outer edge 40…legs 41...Head 43, 45…Prevention parts 50…Finger hook

Claims

1. A form forming unit comprising a form panel, a reinforcing bar, a separator and a clip, The separator includes a rod-shaped main body and folded-back portions provided at both ends thereof and engaged with the reinforcing steel bars or the frame body of the form panel, The folded portion includes a circumferential portion that is continuous with the rod-shaped main body portion and circumferentially surrounds the reinforcing steel bar or the frame body, and an extension portion that extends from an end of the circumferential portion toward the rod-shaped main body portion, A retaining portion is provided between the rod-shaped main body portion and the circumferential portion and / or between the circumferential portion and the extension portion, The clip is engaged with the circumferential portion of the folded portion, a narrow portion is formed in the circumferential portion, the narrow portion being narrower than the rod-shaped main body portion and / or the extension portion when viewed from a direction perpendicular to the axis of the rod-shaped main body portion, for receiving the clip, and a step is formed as the slip-out prevention portion at a boundary between the narrow portion and the rod-shaped main body portion and / or the extension portion, A form forming unit, wherein the narrow width portion is formed in the circumferential portion at a portion continuing to the rod-shaped main body portion and at a portion continuing to the extension portion.

2. The formwork forming unit as described in claim 1, wherein the narrow width portion is formed in the portion continuing from the rod-shaped main body portion, extending beyond the reinforcing steel bar or the frame body of the formwork panel that engages with the folded portion and reaching the outside.

3. The formwork forming unit as described in claim 2, wherein the outer edge forming the boundary on the circumferential portion side of the narrow width portion formed in the portion continuing from the rod-shaped main body portion is formed in a tapered shape that moves away from the rod-shaped main body portion as it approaches the outside of the circumferential portion.

4. The formwork forming unit according to any one of claims 1 to 3, wherein the clip has a head and a pair of legs, the pair of legs being engaged with the circumferential portion so as to sandwich the circumferential portion.

5. The clip has a head and a pair of legs, and the pair of legs are engaged with the circumferential portion so as to sandwich the circumferential portion, The formwork forming unit according to claim 1 , wherein the pair of legs are engaged with the circumferential portion and interfere with the step to be prevented from coming off.

6. The formwork forming unit according to claim 4 or claim 5, wherein the pair of legs are provided with anti-slip portions that protrude from inner surfaces facing each other and engage with the circumferential portion.

7. The form forming unit according to any one of claims 1 to 6, wherein a finger grip portion is formed on a head portion of the clip.

8. A form forming unit comprising a form panel, a reinforcing bar, a separator and a clip, The separator includes a rod-shaped main body and folded-back portions provided at both ends thereof and engaged with the reinforcing steel bars or the frame body of the form panel, The folded portion includes a circumferential portion that is continuous with the rod-shaped main body portion and circumferentially surrounds the reinforcing steel bar or the frame body, and an extension portion that extends from an end of the circumferential portion toward the rod-shaped main body portion, A retaining portion is provided between the rod-shaped main body portion and the circumferential portion and / or between the circumferential portion and the extension portion, The separator is used in a form forming unit, the clip being engaged with the circumferential portion of the folded-back portion, When viewed from a direction perpendicular to the axis of the rod-shaped main body portion, the circumferential portion is formed with a narrow portion that is narrower than the rod-shaped main body portion and / or the extension portion and that receives the clip, and a step is formed as the slip-out prevention portion at a boundary between the narrow portion and the rod-shaped main body portion and / or the extension portion, A separator, wherein the narrow width portion is formed in a portion of the circumferential portion that continues to the rod-shaped main body portion and a portion that continues to the extension portion.

9. 9. The separator according to claim 8, wherein the narrow width portion is formed in a portion continuing from the rod-shaped main body portion up to a portion extending beyond the reinforcing steel bar or the frame body of the formwork panel that engages with the folded-back portion and reaching the outside.

10. 10. The separator according to claim 9, wherein an outer edge forming a boundary on the circumferential portion side of the narrow width portion formed in a portion continuing from the rod-shaped main body portion is formed in a tapered shape that moves away from the rod-shaped main body portion as it moves toward the outside of the circumferential portion.

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