JP3001542U - Clamps for concrete formwork - Google Patents

Abstract

(57) [Summary] [Structure] The cross-sectional shape is approximately M-shaped and its central protruding portion 3a is provided.
Is a circular arc shaped steel member 3 and a V-shaped member 4 having a V-shaped member 4 on the side where the central protruding portion 3a protrudes, both ends being connected to the both ends thereof, and a hook 5 being attached to the top.
And a threaded shaft 7 having a hooking portion 9 at one end and tiltably passing through a through hole 6 at a central position in the longitudinal direction of the central protruding portion 3a.
And a fastener 2 having a nut 8 screwed onto the screw shaft 7 on the projecting side of the central projecting portion 3a. [Effect] There is no risk that the mold steel member 3 will be deformed by the tightening load and the tightening will be loosened, and the screw shaft 7 will be attached to the metal fitting body 1
With respect to the fitting 8, the fitting 8 can be freely bent, the screw is not damaged by the one-side contact of the nut 8, and there is no edge of the steel mold member 3 in the direction in which the fitting main body 1 moves during tightening, so that the fitting main body 1 moves smoothly. And the imbalance of the tightening force of the chain can be easily eliminated.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a concrete form clamp fitting used in a form work such as a column or a column with a rounded corner.

[0002]

[Prior art]

 For example, curved formwork is generally used in the formwork of cylindrical pillars, and vertical end thick materials are arranged at appropriate intervals in the circumferential direction of the curved formwork, and a chain around it. The curved formwork is supported by winding the chain and tightening the chain.

As a tightening fitting for tightening a chain, for example, one disclosed in Japanese Utility Model Laid-Open No. 4-130654 is known. The concrete form fittings will be described with reference to FIG. 5, in which both ends of the V-shaped member 22 having the hooks 23 on the top are attached to the metal body 21 having a substantially U-shaped cross section. Attaching the V-shaped member 22 of the metal fitting body 21, the through hole 24 drilled in the side portion of the V-shaped member 22 is provided with a hooking portion 26 at the tip. The screw shaft 25 is inserted so as to extend to the opposite side of the V-shaped member 22. Then, a concrete form clamp fitting has been proposed in which a nut 27 is screwed from an end portion of the screw shaft 25 on the V-shaped member 22 side, and a portion where the nut 27 of the fitting body 21 is engaged has an inclined portion 28. There is. In FIG. 5, 29 is a nail fastening hole for fixing the metal fitting body 21 to a thick vertical end material or the like.

According to such a concrete form clamp fitting, by hooking both ends of the chain to the hooking claw 23 at the tip of the V-shaped member 22 and the hooking portion 26 at the tip of the screw shaft 25, the nut 27 is rotated. The screw shaft 25 can be moved to the V-shaped member 22 side of the metal fitting body 21 to tighten the chain. At this time, the rotation operation of the nut 27 is easy and the surface with which the nut 27 engages is the inclined portion 28. The screw shaft 25 is bent in a state of being bent with respect to the metal fitting body 21, and is easily adapted to the circumferential shape, and the vertical end thick material near the concrete form fitting can be surely supported.

[0005]

[Problems to be solved by the device]

 However, in the concrete form tightening metal fitting having the above-mentioned configuration, the mounting position of the V-shaped member 22 in the metal fitting body 21 and the inclined portion 28 in which the through hole 24 through which the screw shaft 25 is inserted are arranged in parallel in a plan view. Since the V-shaped member 22 and the axis of the screw shaft 25 do not intersect at a single point on the metal fitting body 21, a bending stress acts on the metal fitting body 21 due to the tightening load, and the metal fitting body 11 is deformed and tightened. There is a risk of loosening. Further, the refraction state of the screw shaft 25 with respect to the metal fitting body 11 does not always match the inclined portion 28, and in that case, the nut 27 may hit one side and damage the screw. Furthermore, even if the metal fitting body 11 tries to move so as to eliminate the imbalance of the tightening force in the circumferential direction of the chain during tightening, the edge of the metal fitting body 11 exists in the moving direction, so that this edge may be a vertical end thick material or There was a problem in that it could be engaged with the formwork and hindered smooth movement, and the tightening work could be ended when the entire circumference was not evenly tightened, resulting in loosening of the chain.

In view of the above-mentioned conventional problems, the present invention is such that the V-shaped member and the axis of the screw shaft intersect at a point on the tool body in a plan view, and the metal fitting body is deformed by the tightening force and tightened. There is no fear that the nut will loosen, the screw will not be damaged by one-sided nut contact, and the metal fitting body will move smoothly with tightening, making it possible to easily and reliably secure the tightened state. The purpose is to propose a frame clamp.

[0007]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention has a metal fitting body (1) and a fastener (2) if the reference numerals in the embodiments described below are shown in parentheses for reference. (1) has a shaped steel member (3), a V-shaped member (4), and a latch claw (5), and the shaped steel member (3) has a substantially M-shaped cross section. The central protrusion (3a) has an arc shape, has a through hole (6) at the center position in the longitudinal direction of the central protrusion (3a), and the V-shaped member (4) is a shaped steel member (3). On the side where the central projecting portion (3a) projects, both ends are connected near both ends in the length direction of the central projecting portion (3a), and the latch claw (5) is rotatable on the top of the V-shaped member (4). The fastener (2) has a screw shaft (7) and a nut (8), and the screw shaft (7) has a hook portion (9) at one end and the other end side is a metal fitting body. In the (1), the through hole (6) of the die steel member (3) is tiltably penetrated, and the nut (8) is attached to In the body (1), a configuration is adopted in which a threaded shaft (7) is screwed on the projecting side of the central projecting portion (3a) of the steel mold member (3).

[0008]

【Example】

 Hereinafter, a concrete form clamp fitting according to an embodiment of the present invention will be described with reference to FIGS. 1 to 4.

The concrete form fitting metal fitting 10 of the present embodiment is composed of a metal fitting body 1 and a fastener 2. The metal fitting body 1 is composed of a shaped steel member 3, a V-shaped member 4, and a hook 5. The steel mold member 3 has a substantially M-shaped cross-section, its central protruding portion 3a has an arc shape, and a through hole 6 is formed at a central position in the longitudinal direction of the central protruding portion 3a. Both ends 4a of the V-shaped member 4 are fixed by welding 4b near both ends in the length direction of the central protruding portion 3a on the side where the central protruding portion 3a of the steel mold member 3 protrudes. The hook 5 is rotatably fitted to the top of the V-shaped member 4.

The fastener 2 is composed of a screw shaft 7 and a nut 8. A hook portion 9 formed by welding a U-shaped rod is provided at one end 7a of the screw shaft 7. The other end 7b side of the screw shaft 7 is a central protrusion of the steel mold member 3 in the metal fitting body 1. A nut 8 is penetrated through a through hole 6 bored in the portion 3a, and a nut 8 is screwed from the other end side 7b so that the nut 8 engages with the central protruding portion 3a of the shaped steel member 3. Further, the inner diameter of the through hole 6 is formed to be larger than the outer diameter of the screw shaft 7, and the screw shaft 7 penetrates the through hole 6 in a tiltable manner.

In the above configuration, as shown in FIG. 2, the curved form 12 is arranged so as to surround the outer circumference of the cylinder 11 to be constructed, and the vertical end thick material 13 or The curved formwork 12 can be supported by arranging the steel pipe end thickness 14, winding the chain 15 around the circumference of the steel pipe end, and tightening both ends with the concrete formwork clamp fittings 10.

To tighten the chain 15 with the concrete form fittings 10, the hooks 5 at the tip of the V-shaped member 4 and the hooks 9 at the tip of the screw shaft 7 are hooked at both ends of the chain 15 and the nut 8 is rotated. Manipulate. Then, the nut 8 engages with the central protruding portion 3a of the shaped steel member 3, the screw shaft 7 moves to the V-shaped member 4 side of the metal fitting body 3, and the chain 15 is tightened. At that time, since the nut 8 is engaged with the central projecting portion 3a having an arc-shaped cross section, the screw shaft 7 can be easily bent in any direction with respect to the metal fitting body 1, and is easily adapted to the circumferential shape. Also, the vertical end thick material 13 and the steel pipe end thick 14 in the vicinity of the concrete form clamp metal fitting 10 are securely supported.

Further, the mounting position of the V-shaped member 4 in the metal fitting body 3 and the through hole 6 through which the screw shaft 7 penetrates are aligned on the central protruding portion 3 a of the steel mold member 3 in a plan view, and the V-shaped member 4 and the screw Since the axis of the shaft 7 intersects with the central protruding portion 3a in a plan view, the bending stress in the horizontal direction does not act on the steel mold member 3 due to the tightening load, and the tightening may be loosened due to the deformation of the steel mold member 3. Absent. Although bending stress acts in the vertical direction of the shaped steel member 3, since the cross-sectional shape is substantially M-shaped and a load acts on the central protruding portion 3a, the bending rigidity is not likely to be greatly deformed.

Further, since the nut 8 screwed onto the screw shaft 7 is engaged with the central projecting portion 3 a of the arcuate cross section of the shaped steel member 3, the screw shaft 7 is bent in an arbitrary bent state with respect to the metal fitting body 1. In that case, the nut 8 does not come into partial contact, and the screw of the screw shaft 7 is not damaged even if the screw shaft is largely bent with respect to the metal fitting body 1.

Further, since both side bent portions of the substantially M-shaped cross section of the steel mold member 3 are located in the direction in which the metal fitting body 1 moves when the chain 15 is tightened, and the edges are located on the opposite side. When the metal fitting body 1 tries to move, there is no fear that the edge will engage with the vertical end thick material 13 or the formwork 12 to prevent smooth movement, and therefore the metal fitting body 1 will move smoothly during tightening. This makes it possible to easily eliminate the imbalance of the tightening force of the chain 15 in the circumferential direction. Thus, it is possible to prevent the tightening work from being completed in a state where the chain 15 is not tightened uniformly over the entire circumference and then the chain 15 is loosened.

[0016]

[Operation and effect of the device]

 The fastening tool for concrete formwork of the present invention can be implemented as described above, and the mounting position of the V-shaped member and the through hole through which the screw shaft penetrates are both in the central protruding portion of the tool body. Since the V-shaped member and the axis of the screw shaft intersect at the central projecting position of the metal fitting body in plan view, there is no horizontal bending stress acting on the metal fitting body due to the tightening load. There is no risk of loosening the tightening. Further, since the nut screwed to the screw shaft is engaged with the central protruding portion of the arcuate cross section, the screw shaft can be bent in an arbitrary state with respect to the metal fitting body, and in that case, the nut piece There is no danger of damaging the screw by hitting. In addition, since both sides of the substantially M-shaped cross section of the steel mold member are located in the direction in which the metal fitting body moves during tightening, and the edges are located on the opposite side, when the metal fitting body tries to move. There is no risk that the edge will be engaged with the thick vertical end material or the formwork and hinder smooth movement, and the smooth movement of the metal fitting body during tightening will balance the tightening force in the circumferential direction of the chain. It can be easily eliminated, and the tightening work will be completed when the entire circumference is not evenly tightened, and there is no risk of the chain becoming loose after that.

[Brief description of drawings]

FIG. 1 is a perspective view of a concrete form clamping member according to an embodiment of the present invention.

FIG. 2 is a plan view showing a state where the concrete form fittings of the embodiment are used.

3 is a cross-sectional plan view taken along the line AA of FIG.

4 is a cross-sectional front view taken along the line BB of FIG.

FIG. 5 is a perspective view of a concrete form clamping member of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Metal fitting body 2 Fastener 3 Type steel member 3a Central protruding part 4 V-shaped member 5 Locking claw 6 Through hole 7 Screw shaft 8 Nut 9 Locking part

Claims (1)

[Scope of utility model registration request] 1. A metal fitting body (1) and a fastener (2), wherein the metal fitting body (1) comprises a steel mold member (3) and a V-shaped member (4).
And a hook claw (5), the shape steel member (3) has a substantially M-shaped cross-section, and its central protrusion (3a) is an arc shape.
The central protrusion (3a) has a through hole (6) at the center position in the longitudinal direction, and the V-shaped member (4) is the central protrusion (3) of the steel member (3).
On the side where a) protrudes, both ends are connected to the vicinity of both ends in the longitudinal direction of the central protruding part (3a), and the hooks (5) are V-shaped members.
It is rotatably fitted to the top of (4), the fastener (2) has a screw shaft (7) and a nut (8), and the screw shaft (7) has a hook (9) at one end. And the other end penetrates the through hole (6) of the shaped steel member (3) of the metal fitting body (1) in a tiltable manner, and the nut (8) is located at the center of the shaped steel material member (3) of the metal fitting body (1). On the protruding side of the protruding part (3a), screw shaft
(7) Tightening fitting for concrete formwork screwed into.