JP2002242429A - Blocking metal fitting for concrete form - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a blocking metal fitting for a concrete form for simplifying design more than conventional design, and easily formable in a simple manufac turing process. SOLUTION: This blocking metal fitting for the concrete from has a metal fitting body having an almost inverse U-shaped integral structure forming a pair of subject parts integrally and mutually opposed in parallel in a base part, and forming an almost U-shaped cutout part communicating in the base part in the subject part opening direction from the base part of the subject parts in a plan view in the direction for overlapping in the pair of subject parts, and a wedge member for sandwiching and fixing a reinforcement by and to the metal fitting body by being inserted and driven from one edge side of the metal fitting body between the reinforcement and a base part inside surface in a state of inserting and placing the reinforcement in a bottom part. In at least one of the pair of subject parts, a screw hole is arranged in a position nearer in the subject part opening direction than the wedge member in a state of sandwiching and fixing the reinforcement in the vicinity of the cutout part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal fitting for a concrete formwork.

[0002]

2. Description of the Related Art When constructing various concrete structures such as concrete walls and concrete columns, as shown in FIG. 7, a concrete formwork 40 serving as a mold is first assembled, and concrete is placed in the formwork. After casting and curing the concrete, the formwork is dismantled and removed.

The assembling and fixing of the concrete formwork 40 is performed as follows.
Usually, this is performed by using a reinforcing bar 42 protruding from an existing concrete slab 41 and fixing the two with a fixing metal 30 interposed between the reinforcing bar 42 and the formwork 40.

[0004] A conventional general form-fixing metal fitting is provided with a mechanism for holding and fixing a reinforcing bar, and for fixing the form to the concrete form while maintaining a space between the forms. Means are also provided.

[0005] That is, the stopper metal fitting 30 is fixed by sandwiching the reinforcing bar 42, and one end of a rod-shaped or tubular separator 36 is attached to the metal fitting body, and is screwed to the other end of the separator 36. A bolt protruding from the tip of the cone 37 is passed through a bolt through hole provided at a predetermined height below the mold 40, and the position of the cone 37 is adjusted to a predetermined mold frame interval, so that the mold 40 Is performed.

After this positioning, if a formwork fastener is screwed from the outside of the formwork 40 into the bolt at the tip of the cone 37 protruding from the bolt through hole, it is fixed to the root stopper 30 fixed to the reinforcing bar 42. The mold 40 is fixed. In this way, the molds 40 are assembled by fixing the molds 40 to the reinforcing bars 42 via the stoppers 30 so as to be at a predetermined interval from each other.

[0007]

However, in the conventional fixing metal fittings, the separator is welded and fixed to the metal fitting body. Therefore, when it is desired to use a separator of a different size, the metal fitting body is manufactured for each separator size. In addition, it was not possible to change the whole metal fittings, and the fixing metal could not be used in common.

[0008] In such a conventional stopper metal fitting, not only a mechanism for holding and fixing the reinforcing bar is formed on the metal fitting body, but also a process of welding and fixing the separator is required, and the manufacturing process is troublesome. . Moreover, as described above, since the metal fitting main body must be manufactured for each type of separator, handling is always complicated, such as manufacturing, storage management, and selection according to the site. Therefore, a fixing metal fitting that allows an arbitrary separator to be attached immediately before use without welding and fixing the separator to the metal fitting body is being considered.

For example, as shown in FIG.
In the embodiment, the metal fitting body 31 is bent in a U-shaped cross section so that a pair of main portions 32 facing each other in parallel are formed, and the reinforcing bar 42 is brought into contact with the semicircular bent portion to form a pair of metal members. A wedge member 34 is inserted into a slit opening 33 formed in each of opposing positions of the main body portion 32 and is driven into the slit opening 33 to clamp and fix the reinforcing bar 42.
The high nut 35 is welded and fixed to the top of the bent part of the first,
The threaded one end of the separator 36 is screwed into the nut 35 and attached.

[0010] However, in the fixing device of FIG. 5, the separator is mounted by screwing.
As long as the screw processing is suitable for the nut 35, separators of different lengths, sizes, and types can be arbitrarily selected and attached. However, a process of welding and fixing a nut member for attaching the separator is necessary. The trouble is the same as before.

Thus, at present, there is a demand for a screw fitting which is easy to design and manufacture, is capable of mounting an optional separator, and is easy to handle.

SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide a concrete form-fixing metal fitting which has a simpler structure than conventional ones, is easy to manufacture, and has an optional separator. It is in.

[0013]

According to a first aspect of the present invention, there is provided a concrete formwork fixing member according to the first aspect of the present invention, wherein a pair of main portions are integrally formed at a base portion and face each other in parallel with each other. A substantially U-shaped notch having a substantially inverted U-shaped integral structure and communicating with the base from the base of the main body toward the main body opening direction in a plan view in a direction in which the pair of main bodies overlap. In the state where the reinforcing bar to be fixed is inserted and mounted at the bottom of the notch, the metal bar is formed between the reinforcing bar and the inner surface of the base, and inserted and driven from one edge side of the metal bracket. A wedge member for holding and fixing the rebar to the metal fitting body, wherein at least one of the pair of main portions is closer to the cutout portion than the wedge member that is in a state where the rebar is held and fixed. The screw hole is located in the direction It is what is kicked.

According to a second aspect of the present invention, there is provided a concrete formwork fixing device according to the first aspect, wherein the wedge member receives an impact from a driving tool. One longitudinal edge in contact with the inner surface of the metal fitting body forms a right angle with the tail edge to be formed, and the other longitudinal edge in contact with the reinforcing bar forms an acute angle.

According to a third aspect of the present invention, there is provided a concrete form-holding metal fitting according to the first or second aspect, wherein the metal fitting body comprises the pair of main bodies. The notch has a left-right symmetric shape located in the center of the pair of main parts in a plan view in the direction in which the parts overlap, and the wedge member can be inserted and driven from either side of both side edges of the metal fitting body It is what it was.

In the rooting metal fitting for a concrete formwork of the present invention, the main body of the metal body having a substantially inverted U-shape integrated structure in which a pair of main bodies which are integrally formed at the base and face each other in parallel to each other is provided with a reinforcing bar. A substantially U-shaped notch serving as a holding portion is formed from the base toward the main body opening direction. A simple operation of inserting a reinforcing bar from the base where the two notches communicate with each other to the bottom of the notch, and inserting and driving a wedge member between the mounted reinforcing bar and the inner surface of the base of the metal fitting body. The rebar is sandwiched between the notch of the metal fitting body and the bottom of the notch, and the fixing metal can be easily fixed to the metal rebar.

The substantially U-shaped structure of the metal fitting body can be easily formed by a step of bending a metal flat plate by press working or the like, and then a notch may be simultaneously formed in one main body.

Further, in the present invention, the screw hole is provided in at least one of the pair of main portions at a position closer to the notch portion at which the reinforcing bar is clamped than at the wedge member in a state where the reinforcing bar is clamped and fixed. It is provided at a position closer to the direction. This screw hole can serve as a mounting portion into which one end of the separator is screwed.

That is, in the present invention, if the screw hole and the threading at one end of the separator are screwed to each other, the metal fitting body is common, and various lengths and sizes,
Different types of separators can be arbitrarily selected and installed just before use.

Further, the screw hole serving as the separator mounting portion is formed in the same region as the main portion of the metal fitting body together with the reinforcing bar holding portion, so that it is not necessary to fix the separator directly to the metal fitting body as in the prior art. There is no need to weld and fix the nut member to attach the
This eliminates the need for a manufacturing process and simplifies the configuration of the stopper metal itself. In addition, if the design is simplified, the metal fitting itself can be reduced in size and the amount of necessary material can be reduced. Management, transport,
The handling becomes very simple over the field use.

The screw holes for mounting the separator are as follows:
A configuration in which only one of the main portions is attached, or a configuration in which a through hole and a screw hole are provided at corresponding positions of both arm portions so that the separator can be attached in a penetrating state between the pair of main portions may be provided. Alternatively, a screw hole may be provided in each of the pair of main portions so that the main portion can be attached to either side. In this case, it is convenient to set the rotation direction of the screw hole so that a common separator can be screwed.

Further, even if screw holes of different diameters are provided in each of the pair of main portions,
A plurality of screw holes having different diameters and threaded holes may be provided, and an arbitrary screw hole may be appropriately selected according to a target separator.

The screw holes according to the present invention can be used not only for mounting a separator but also for mounting various members necessary for forming a concrete formwork. In this case, a screw hole may be formed according to a member to be attached. Thereby, various members can be fixed to the rebar via the metal fittings.

Further, the wedge member of the stopper metal fitting according to the present invention is inserted between the reinforcing steel placed on the bottom of the notch and the inner surface of the base of the metal fitting main body to press the reinforcing steel downward. Because it is to be clamped and fixed, the shape of the wedge member is such that one long edge is inserted into the base inner surface with respect to the tail edge to be subjected to the impact by the driving tool so that it can be inserted while being in contact with the base inner surface of the bracket main body. The shape may be such that one of the longitudinal edges that make contact is at a right angle and the other longitudinal edge that is in contact with the rebar makes an acute angle.

That is, the wedge member may have a substantially right-angled triangle when viewed from the front side (the direction in which the pair of main portions overlap). Therefore, as a configuration of such a wedge member,
It may be a metal plate having a substantially right triangle shape. However, it is preferable that the wedge member has such a shape that it is difficult for the wedge member to be displaced in the axial direction with respect to the reinforcing bar so that the fixed state is not loosened in the pressing contact with the reinforcing bar, and that both members are easily hooked.

In general, deformed reinforcing bars having convex portions formed at a uniform pitch on the surface are often used. Therefore, the end face of the wedge member which comes into contact with the reinforcing bar is provided between the convex portions of the reinforcing bar surface. Even if an external force along the axial direction of the reinforcing bar acts on the metal fitting body, it is desirable that the metal fitting is hooked by the convex portion so as to restrict its movement.

Even with the flat wedge member described above, the end of the long edge in contact with the reinforcing bar may be caught on the convex portion of the reinforcing bar surface. Is required.

Alternatively, the wedge member is formed in an inverted U shape forming a pair of reinforcing bar pressing portions facing each other in a side sectional shape so as to fit inside the base portion of the metal fitting main body. A configuration in which the rebar is pressed at the open side edge is preferable. In this case, if the interval between both rebar holding parts is set to an appropriate distance in accordance with the pitch of the projections of the rebar,
The open-side ends of both holding portions fall into the recesses between the reinforcing bar protrusions at predetermined positions as the wedge members are inserted and driven. Thus, the movement of the metal fitting body with respect to the reinforcing steel is restricted, and the fixing metal is prevented from loosening and coming off the reinforcing steel. The wedge member having the inverted U-shape in a straight section can be easily manufactured in a single step by press working from a metal flat plate having a predetermined shape similarly to the metal fitting body.

Further, the metal fitting body has a left-right symmetrical shape in which the notch portion is located at the center of the pair of main body parts in a plan view in the direction in which the pair of main body parts overlap, and the metal fitting body is formed from either side of both side edges of the metal fitting body. It is more desirable that the wedge member be inserted and driven. Accordingly, the worker can drive the wedge member from the direction in which the work can be easily performed according to the situation of the metal fixing portion of the reinforcing bar, so that the fixing work of the root stopper to the reinforcing bar becomes easier.

In this case, since the metal fitting body can be fixed to the reinforcing bar in any direction, if screw holes of different sizes are provided in each of the pair of main portions, the screw holes can be selected according to the spacer. In addition, the mounting of different spacers can be performed with the same metal fitting body.

Further, with respect to the reinforcing bars having different diameters, if the length dimension of the tail end of the wedge member which receives the driving impact is changed to change the acute angle of the longitudinal edge on the side in contact with the reinforcing bar, The metal fittings can be made of the same shape. For example, at present, two types of rebar having an outer diameter of 13 mm and 16 mm are generally widely used.
It is sufficient to prepare two types of wedge members having different tail edge lengths for these reinforcing bars of both sizes.

As described above, particularly in the case of a metal fitting body having a symmetrical shape and capable of driving the wedge member from either side of the both edges, the same metal fitting body is used, but the wedge member is also formed at the tail end. As long as the length of the edge is changed, separators and rebars of different sizes can be accommodated, so that the number of members constituting the stopper is very small, and mass production of the product is very easy.

[0033]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an embodiment of the present invention. FIG. 1 is a schematic perspective view showing the entire configuration of the stopper metal according to the present embodiment. FIG. 2 is a schematic configuration diagram showing a state in which a reinforcing bar is clamped and fixed by the stopper metal of FIG. 1. FIG. 4B is a side view, and FIG.

The stopper metal fitting 10 of this embodiment is mainly composed of a pair of main body parts 2 which are integrally formed at the base and face each other in parallel.
Metal body 1 having a substantially inverted U-shaped integral structure forming
And a substantially inverted U-shaped wedge member 6 formed with a pair of reinforcing bar pressing portions 7 facing each other in a side sectional shape smaller than the internal shape of the base of the metal fitting main body 1.

The pair of main portions 2 of the bracket main body 1 have a substantially U-shaped notch communicating with the base portion from the base portion of the main portion toward the opening direction of the main portion in plan view in the direction in which the main portions overlap. A portion 3 is formed, and the reinforcing bar 20 to be fixed is inserted and placed at the bottom of the notch 3 between the two main portions, and between the reinforcing bar 20 and the inner surface of the base of the fitting body 1. By inserting and driving the wedge member 6 from one end edge side of the metal fitting body 1, the reinforcing bar 20 is pressed toward the bottom side of the notch 3 and is clamped and fixed between the metal fitting body 1 and the wedge member 6.

In this embodiment, the metal fitting body 1 is used.
Is viewed from above in the direction in which the pair of main bodies 2 overlap (FIG. 2B)
(A front view of FIG. 1), the notch 3 is formed in a pair of symmetrical shapes located in the center of the main body, so that the wedge member 6 can be inserted and driven from either end of the metal fitting body. With this configuration, the worker can drive the wedge member 6 from the side where the work is easy, so that the fixing work of the fixing metal fitting 10 to the reinforcing bar 20 becomes easier.

In the present embodiment, the wedge member 6 has a pair of reinforcing bar pressing portions 7 facing each other in a substantially inverted U-shape in cross section and facing each other in parallel, and a plan view of the reinforcing bar pressing portions 7 in the overlapping direction. Then, one longitudinal edge that contacts the inner surface of the base of the metal fitting body 1 is perpendicular to the tail edge that is to be impacted at the time of driving, and the other longitudinal edge that contacts the reinforcing bar 20, that is, the open side edge of the reinforcing bar pressing portion 7. Have a substantially right triangle shape forming an acute angle.

The wedge member 6 is configured so that it can be more firmly held and fixed to a deformed reinforcing bar having a convex portion 21 formed on the surface. As shown in the side view of FIG. 2A and the front view of FIG. 2B, each end of the wedge member 6 on the open side in contact with the reinforcing bar of the pair of reinforcing bar pressing portions 7 facing in parallel with each other is driven by driving. Along with this, it falls into the recesses between the protrusions 21 on the rebar surface,
A state of being held and fixed in a state of being fitted into the concave portion.

Accordingly, the reinforcing bar 20 of the pair of reinforcing bar pressing portions 7
Even if an external force in the direction of the reinforcing bar axis acts on the end portion pressing the wedge member 6, the movement of the wedge member 6 is restricted by being caught by the nearby convex portion 21, so that the holding and fixing is firmly maintained. Such an effect also occurs on the metal fitting body 1 side, and the bottom of the notch 3 is caught by the convex portion 21 on the reinforcing bar surface, making it difficult to shift the metal fitting body 1 in the axial direction of the reinforcing bar.

In the stopper according to the present embodiment, the notch 3 is formed in one of the pair of main portions 2 of the bracket main body 1.
A screw hole 4 for screwing one end of the threaded part of the separator 36 into the main body part opening direction (downward in the drawing) from the wedge member 6 in a state where the reinforcing bar 20 is clamped and fixed in the vicinity of is provided. Is provided.

Further, in this embodiment, the metal fitting body 1 is
As described above, the main body 2 has a symmetrical shape in plan view in the direction in which the pair of main bodies 2 overlap, and the wedge member 6 can be inserted and driven from either side of the both end edges.
Can be fixed to the reinforcing bar 20 in either direction.

Therefore, a through hole 5 through which one end of the separator 36 can penetrate is provided at a position corresponding to the other main portion 2 opposite to the screw hole 4. Therefore, if one end of the separator 36 is passed through the through hole 5 and screwed into the screw hole 4 from the main body side, the separator 3 is projected from the other main body 2 side.
6 can be attached, the separator 36 can be attached in the same direction regardless of which direction the pair of main parts 2 are front and rear, and the separator 36 is attached to the front and rear sides opposite to each other with respect to the fitting body 1. Can be.

Of course, the through hole 5 of the other main body 2 may be formed as a screw hole so as to be directly screwed. Also,
A screw hole having a diameter different from each other may be provided in each of the pair of main portions 2 so as to be able to cope with the use of a separator having a different screw size at one end. For example, currently used separators generally have a screw size of 3/8 inch in outer diameter and 5/12 inch in outer diameter. Therefore, screw holes for 3/8 and 5/12 are previously formed in the main body 2 respectively. If it is formed, it can correspond to the type of separator used in the field. Further, a plurality of different screw holes may be formed in the same main body 2.

The separator 3 is formed by only one main part 2.
Since the mechanical strength of the mounting portion is improved by supporting with both main portions 2 than when supporting 6, the end portion of the separator 36 can be supported in a bridge state between the pair of main portions 2. Is more desirable. For example, it can be easily realized by interposing a nut member between the pair of main portions 2.

That is, as shown in FIG.
The nut member 25 is provided between the pair of main portions 2 at positions where the screw hole openings on both sides of the two main portions 2 coincide with each other.
If the nut member 25 is fixed to the bracket body by screwing it with a hexagon bolt 26 or the like from the outside of the
The end of the separator 36 can be screwed into the opening of one of the screw holes from the through hole 8 of the one main body 2 and attached. As a result, the end of the separator 36 is
It is supported by both of the pair of main parts 2, and the supporting strength is remarkably improved as compared with the case of being supported by only one main part 2.

In the fixing member according to the present embodiment as described above, the screw hole 4 as the mounting portion of the separator 36 is formed in the same region as the main portion 2 of the metal fitting body 1 together with the notch portion 3 as the reinforcing bar holding portion. As in the past, the extension portion is further provided in the bracket main body, and the process and the separate nut member are welded and fixed. The manufacturing process and design are simplified, and the configuration is simple and easy to handle.

In the above embodiment, as shown in the plan view seen from the end of the arm in FIG. 4A, the pair of arms 7 have the same width in the longitudinal direction facing each other in parallel. Although the case where the wedge member is used has been described, the width is not limited to the shape in which the pair of arms 7 face each other parallel to each other, and the width increases from the tail end side in the longitudinal direction toward the tip end as shown in FIG. A tapered shape that changes narrowly may be used.

The wedge member according to the present invention is not limited to the inverted U-shaped side sectional shape described above. For example, the wedge member may have a T-shaped side sectional shape or a substantially right triangle shape in plan view. Such as a flat plate having a thickness close to the interval between the pair of main portions and having irregularities formed on the reinforcing bar contact end face, which can firmly press the reinforcing bar against the bottom of the notch portion 3 and can maintain the sandwiched and fixed state without displacement. If so, various things can be used.

However, the simpler the design and manufacturing process, the more desirable. The above-mentioned wedge member having an inverted U-shaped side cross section can be easily manufactured just by bending a metal flat plate by pressing or the like, like the metal fitting body. , A shape suitable for the present invention.

The reinforcing bars used for the reinforced concrete are not always the same in diameter, but the same main body can be shared by changing only the size of the wedge member. That is, as shown in FIG. 5A, when the diameter of the reinforcing bar is small, the wedge member 6 has a long length dimension D at the tail end, and the acute angle of the longitudinal edge on the side in contact with the reinforcing bar with respect to the tail end. The design may be small, and if the rebar diameter is large, as shown in FIG. 5 (b), the length dimension d of the tail edge is short and the acute angle of the long edge on the side in contact with the rebar with respect to the tail edge. Can be dealt with by adopting a design having a large

For example, at present, the outer diameter is 13 mm or 1 mm.
Since a 6 mm reinforcing bar is mainly used, if two types of wedge members having different tail end lengths are prepared in advance corresponding to the two types of reinforcing bars having a large outer diameter, any iron can be used. Even in the case of gold, the same metal body 1 can be used in common. In this way, the metal fittings have the same shape and are shared by several types of wedge members having different lengths of the tail edge, and can be used for separators and reinforcing bars of different sizes. Is very small, and mass production of the product is very easy.

The screw holes formed in the main body of the metal fitting body of the present invention are not limited to those for mounting the separator, but may be of various types.
It can be used to attach members required for assembling concrete forms. In this case, if a screw hole corresponding to the target member is formed, various members can be attached to the reinforcing bar via the metal fittings.

[0053]

As described above, the concrete stopper according to the present invention has a simpler structure and is easier to manufacture than before, and has the effect that an optional separator can be selectively attached. .

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a root stopper for a concrete formwork according to an embodiment of the present invention.

FIGS. 2A and 2B are explanatory diagrams showing a state in which a reinforcing bar is clamped and fixed by the stopper metal of FIG. 1, wherein FIG. 2A is a side view and FIG.

3A and 3B are schematic configuration diagrams illustrating another example of a configuration of attaching a separator to a metal fitting body, where FIG. 3A is a side view and FIG. 3B is a top view.

4A and 4B are plan views of the wedge member viewed from the ends of a pair of arms, wherein FIG. 4A is a wedge member used in the embodiment of FIG. 1, and FIG.
FIG. 4 is a schematic view showing an example of a wedge member having a shape different from that of the present embodiment.

FIG. 5 is a schematic front view of a fixing member showing a change of a wedge member according to a different rebar size in the embodiment;
(A) is an explanatory view which shows the wedge member for small diameter rebars, and (b) is a large diameter rebar, respectively.

FIGS. 6A and 6B are schematic configuration diagrams showing an example of a conventional fixing tool for a concrete formwork, in which FIG. 6A shows the configuration of the fixing tool, and FIGS. It is explanatory drawing which shows the rebar holding | maintenance fixed state by metal fittings.

FIG. 7 is a schematic configuration diagram showing an assembled state of a general reinforced concrete formwork.

[Explanation of symbols]

 1, 31: metal fitting body 2, 32: main body part 3: notch part 4: screw hole 5, 8: through hole 6, 34: wedge member 7: rebar holding part 10: root stopper metal fitting for concrete formwork 20, 42 : Reinforcing bar 21: Convex part 25: Nut member 26: Hex bolt 33: Slit opening 35: High nut 36: Separator 37: Cone 38: Bolt 40: Concrete form 41: Concrete slab

 ──────────────────────────────────────────────────続 き Continuing from the front page (71) Applicant 501064804 Nakamura Tekko Co., Ltd. 309-5 Ino, Omi-cho, Umi-cho, Kasuya-gun, Fukuoka Prefecture 72) Inventor Seizo Onishi 322 No. 2 Futatsuka, Takaoka-shi, Toyama F-term in Takagi Seiko Co., Ltd. (Reference) 2E164 AA01 BA02 BA12 BA45 BA48 2E177 KB04

Claims (3)

[Claims] 1. A base having a substantially inverted U-shape integral structure in which a pair of main portions are formed integrally and face each other in parallel to each other, and the base portion of the main portion in a plan view in a direction in which the pair of main portions overlap. A metal body having a substantially U-shaped notch communicating with the base toward the opening direction of the main body, and a reinforcing bar to be fixed being inserted and placed at the bottom of the notch. A wedge member which is inserted and driven from one end side of the metal fitting body between the reinforcing bar and the inner surface of the base to pinch and fix the reinforcing steel to the metal fitting body; A threaded hole is provided near the notch at a position closer to the opening direction of the main body portion than the wedge member in a state in which the rebar is sandwiched and fixed. 2. The wedge member has one longitudinal edge in contact with the inner surface of the metal fitting body at a right angle with respect to a tail edge to be subjected to impact by a driving tool, and the other longitudinal edge in contact with a reinforcing bar forms an acute angle. The metal fitting for a concrete formwork according to claim 1, wherein: 3. The metal fitting body has a left-right symmetrical shape in which the notch portion is located at the center of the pair of main body parts in plan view in a direction in which the pair of main body parts overlap, and both side edges of the metal fitting body. The root fitting for a concrete formwork according to claim 1 or 2, wherein the wedge member can be inserted and driven from either side of the above.