Connector of form panel

Abstract

To provide a connector of a form panel capable of preventing reuse of the form panel from being impeded without any scars and dents left on a batten cleat when using the connector made of a U-shaped steel plate and the like.SOLUTION: A connector of the present invention is provided with a frame part and a wedge part. The frame part is provided with a pair of clamping frames facing both of respective side faces of batten cleats of a form panel, a distance between the pair of clamping frames is longer than a width between both of the side faces, and the wedge part is attached on one of the clamp frames movably in a longitudinal direction of the clamp frames and projects from one of the clamping frames to the other of the clamping frames as moving to a front side of the clamping frame to clip both of the side faces of the batten cleats by the wedge part and the other clamp frame. Using the wedge part allows easy adjustment of clamping force to hardly make scars and dents on the batten cleat.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a connector for battens of formwork panels. [Background technology]

[0002] Formwork panels are used at construction sites for pouring concrete. The backside of each formwork panel is fitted with battens, which connect the battens of adjacent formwork panels together to form a seamless connection between the panels. Various types of connectors for connecting the battens of formwork panels have been proposed. For example, the connector disclosed in Patent Document 1 has a U-shaped frame body that fits over the connected crosspieces, and a pair of clamping plates are placed inside the frame body so that they face both sides of the crosspieces. The crosspieces are clipped by tightening the clamping plates with a screw device. Such connectors require screw tightening when connecting and screw loosening when disconnecting, which reduces workability, and the inclusion of a screw device increases the number of parts, resulting in increased manufacturing costs.

[0003] Therefore, a clip for connecting crosspieces, as shown in FIG. 1, has been proposed. This clip 1 is made of a U-shaped, spring-like steel or plastic material. A pair of clamping frames 3 and 4, which stand upright in the vertical direction as shown in the figure, are placed opposite the crosspiece, and the bottom 5 is struck with a hammer or the like to forcefully fit the clamping frames 3 and 4 onto the crosspiece. This restrains both sides of the crosspiece to the clamping frames 3 and 4, thereby connecting the crosspieces. To remove the clip 1 from the crosspiece, insert a crowbar or the like into the opening 7 and move it like a lever. This releases the crosspiece from the clamping frames 3 and 4. The clip 1 configured in this manner can be attached to and detached from the crosspiece without much effort, and can be formed by punching out a steel plate, making it an inexpensive product. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Special Publication No. 2-40192 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the clip 1 of Figure 1, the clamping frames 3 and 4 are forcibly fitted onto both sides of the crosspiece, so the parts of the crosspiece where the clamping frames 3 and 4 interfere are strongly compressed and plastically deformed (leaving dents). Also, when removing the crosspiece from the crosspiece with a crowbar or the like, scars may be left on the crosspiece at the fulcrum where the crowbar hits the crosspiece, or at the parts where the clamping frames 3 and 4 interfere when the clamping frames 3 and 4 are forcibly pulled out after being wedged into the crosspiece. Formwork panels with battens having plastically deformed areas or scars may be treated as rejected products, or even if not rejected, they will look unattractive. [Means for solving the problem]

[0006] As a result of extensive research aimed at solving the above problems, the present inventors have come up with the following invention. That is, a first aspect of the present invention is defined as follows. A connector for formwork panels comprising a frame portion and a wedge portion, The frame portion includes a pair of clamping frames facing each other on both sides of the batten of the form panel, and the distance between the pair of clamping frames is greater than the width between the both sides of the batten, The wedge portion is attached to one of the clamping frames so as to be movable in the forward and backward directions of the clamping frames, and as it moves toward the front side of the clamping frame, it protrudes from one of the clamping frames toward the other clamping frame, and the wedge portion and the other clamping frame clip both sides of the crosspiece. This is a formwork panel connector.

[0007] According to the formwork panel connector of the first aspect defined in this manner, by driving in the wedge portion, the wedge portion and the other clamping frame clip both sides of the crosspiece to connect them, and by pulling out the wedge portion, the clipping force on the crosspiece can be released. Because the movement of the wedge is linear, the clipping force applied to the pier by the wedge and the other clamping frame can also be controlled linearly, making it easy to minimize the clipping force of the pier by the wedge and the clamping frame. This prevents or minimizes plastic deformation of the pier where the two interfere. Furthermore, because the clipping force can be controlled to a minimum, the pier is not unnecessarily damaged when the connector is removed from the pier. Furthermore, this connector is composed of a frame portion and a wedge portion, and does not have a threaded portion as shown in Prior Patent Document 1. This also makes it possible to reduce manufacturing costs.

[0008] The second aspect of the present invention is defined as follows: In the connector defined in the first aspect, the one clamping frame has an inclined surface on the front side approaching the other clamping frame, and the wedge portion has a guided surface that slides along the inclined surface and a clamping surface facing the other clamping frame, When the wedge portion is moved forward, the guided surface slides along the inclined surface, and the clamping surface approaches the other clamping frame. According to the connector defined in the second aspect, the wedge portion moves along one of the clamping frames, thereby stabilizing the movement of the wedge portion.

[0009] The third aspect of the present invention is defined as follows: In the connector defined in the second aspect, the clamping surface has an engaging portion that engages with a side surface of the crosspiece. The provision of such an engaging portion increases the bonding strength between the clamping surface and the pier, preventing the clamping surface, and therefore the connector, from coming off the pier. The shape of this engaging portion can be designed arbitrarily, but in order to minimize the effect of the engaging portion on the pier, the shape can be semicircular or semi-elliptical.

[0010] A fourth aspect of the present invention is defined as follows: In the connector defined in the first aspect, the frame portion is formed by bending a plate-like member, and the bent portion becomes the inclined surface, The wedge portion is a plate-like member inserted between the bent plate-like members. According to the connector of the fourth aspect defined above, the frame portion and the wedge portion are both formed from plate-like members, so that the manufacturing costs can be reduced.

[0011] The fifth aspect of the present invention is defined as follows: In the connector defined in the fourth aspect, the wedge portion has a guide groove formed along the inclined surface, and the frame portion has a pin, The pin is inserted into the guide groove of the wedge portion. According to the connector of the fifth aspect defined as above, the pin of the frame portion can be inserted into the groove of the wedge portion, thereby preventing the two from being separated.

[0012] The sixth aspect of the present invention is defined as follows: In the connector defined in the fifth aspect, a control section is provided in the guide groove to interfere with the pin and determine the limit of penetration of the wedge section, and when the pin interferes with the control section, the tip of the wedge section does not protrude from the pair of clamping frames. According to the connector of the sixth aspect defined above, the pin interferes with the control portion, thereby preventing the tip of the wedge from protruding from the frame body. This prevents the wedge from directly interfering with the formwork panel. In this embodiment, the rear wall of the groove serves as the control portion, and the pin abutting against this rear wall stops the movement of the wedge.

[0013] The seventh aspect of the present invention is defined as follows: In the connector defined in the sixth aspect, the rear end side of the wedge portion is bent to form a flat portion that can withstand a strike from a hammer or the like. Since the wedge portion is formed from a plate-like member, by bending the rear end portion to provide a flat portion, hammering the wedge portion becomes easier.

[0014] The eighth aspect of the present invention is defined as follows: In the connector defined in the seventh aspect, a gap is formed between the flat portion and the frame portion when the pin interferes with the control portion. According to the connector of the eighth aspect defined in this way, even when the pin interferes with the control portion, i.e., when the wedge portion is driven in to the deepest point, a gap is formed between the flat portion and the frame body, and an even wider gap is formed when the wedge portion is driven in shallowly. The existence of this gap ensures a space from the form panel to the flat portion, making it easy to insert a tool such as a hammer or crowbar into this space. [Brief explanation of the drawings]

[0015] [Figure 1] FIG. 1 is a plan view showing a conventional clip. [Figure 2] FIG. 2 is a photograph, substituted for a drawing, showing a connector 10 according to an embodiment of the present invention in a state before connection (open state). [Figure 3] FIG. 3 also shows the connected state. [Figure 4] FIG. 4 is a cross-sectional view of the frame portion 20. [Figure 5] FIG. 5 is a bottom view of the frame 20. [Figure 6] FIG. 6 is a plan view of the wedge portion 30. As shown in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0016] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. As shown in FIGS. 2 and 3, the connector 10 of this embodiment includes a frame portion 20 and a wedge portion 30. The frame portion 20 has an inverted U-shape in plan view in FIGS. 2 and 3, and includes a first clamping frame 21, a second clamping frame 23, and a head portion 24 connecting these. The distance L between the opposing edges of the first clamping frame 21 and the second clamping frame 23 is longer than the width of both sides of the crosspiece to be fitted between them. By making this distance L longer, it becomes possible to apply it to crosspieces of various widths, making it highly versatile.

[0017] The outer peripheral edge of the first clamping frame 21 is formed as an inclined surface 25 that approaches the second clamping frame 23 at its front (the lower side in the figure, the form panel side at the construction site). The angle of inclination can be set as desired, but the included angle with the upper edge of the head portion 24 can be set to 60 to 80 degrees. The inner peripheral edge of the first clamping frame 21 is substantially perpendicular to the upper edge of the head portion 24 . As shown in Fig. 4, a pin hole 26A is provided in the center of the first clamping frame 21, approximately on the rear end side (upper side in the figure). As shown in Figs. 2 and 3, the pin 26 is passed through this pin hole 26A and a guide groove 36 of a wedge portion 30, which will be described later, and is crimped to the outer surface of the first clamping frame 21.

[0018] 4, the frame portion 20 has a structure in which a steel plate is bent, and a reinforcing portion 27 is provided on the inside of the second clamping frame 23. This reinforcing portion 27 can be omitted. The inner peripheral edge of the second clamping frame 23 is substantially perpendicular to the upper edge of the head portion 24. The front end of this inner peripheral edge is rounded to reduce resistance when it is inserted onto the crosspiece.

[0019] The wedge portion 30 is a steel plate member having a clamping edge 31 (corresponding to the clamping surface), a guided edge 35 (corresponding to the guided surface), and a flat portion 38. The flat portion 38 is formed by bending the rear end (upper end in the figure) of the wedge portion 30. The clamping edge 31 is substantially parallel to the inner peripheral edge of the first clamping frame 21 and faces the second clamping frame 23. This allows the clamping edge 31 and the inner peripheral edge of the second clamping frame 23 to abut (parallel) along both side surfaces of the crosspiece. The guided edge 35 is inclined at the same angle as the inclined surface 25 of the first clamping frame 21. As a result, when the wedge portion 30 is inserted into the first clamping frame 21, the guided edge 35 slides along the inclined surface 25 in the front-to-rear direction of the first clamping frame 21 (the up-and-down direction in the figure). By making the inclination angles of the guided edge 35 and the inclined surface 25 equal, the clamping edge 31 of the wedge portion 30 becomes approximately parallel to the inner peripheral edges of the first and second clamping frames. An engagement portion 32 is formed on the clamping edge 31. This engagement portion 32 engages with the side of the crosspiece to prevent it from slipping out. The shape of the engagement portion 32 can be designed as desired, but it is preferable to make its protrusion small to minimize its effect on the side of the crosspiece, and to make the joint with the clamping edge 31 smooth.

[0020] A guide groove 36 is opened in the wedge 30, parallel to the guided edge 35. The pin 26 is inserted into this guide groove 36 in a loose fit state. As shown in FIG. 6, the rear end edge 37 (corresponding to the control portion) of the guide groove 36 interferes with the pin 26, thereby stopping the driving of the wedge 30. In this state, as shown in FIG. 3, the front edge (lower end edge in the figure) of the wedge 30 is at the same position as the front edges of the clamping frames 21, 23 of the frame portion 20, or is located further inward and does not protrude. This prevents the wedge 30 from directly interfering with the formwork panel.

[0021] Furthermore, when the rear end edge of the guide groove 36 interferes with the pin 26, a gap is formed between the flat portion 38 formed on the rear end edge of the wedge portion 30 and the upper edge of the head portion 24 (see FIG. 3). 3 shows the state in which the connector 10 is attached to a crosspiece (not shown), particularly when the wedge portion 30 is driven deepest. In this state, the front edges (lower edges in the figure) of the first and second clamping frames 21, 23 abut or face the form panel. In other words, a space is secured between the front edges of the first and second clamping frames 21, 23 and the flat portion 38. A tool such as a hammer or crowbar is inserted into this space, and the wedge portion 30 is removed using the flat portion 38. However, since the flat portion 38 is spaced apart from the head portion 24, it is easy to engage the tool with the flat portion 38.

[0022] The connector 10 of this embodiment is manufactured as follows. A material for the open frame 20 is punched out from a steel plate. The obtained material for the frame 20 is bent so that the inclined surface 25 is formed. In parallel with this, the wedge portion 30 is punched out of the steel plate and the flat portion 38 is bent. The wedge portion 30 is inserted into the first clamping frame 21 of the bent frame portion 20, and the guide groove 36 of the wedge portion 30 is aligned with the pin hole 26A of the frame portion 20, and the pin 26 is passed through them. Both ends of the pin 26 are crimped and fixed to the outer surface of the first clamping frame 21.

[0023] The connector 10 thus manufactured is used as follows. The first and second clamping frames 21, 23 of the connector 10 in the state shown in FIG. 2 (open state) are extrapolated in a loose fit onto the battens to be connected. Next, the flat portion 38 is struck with a hammer or the like to drive in the wedge portion 30. The guided edge 35 of the wedge portion 30 moves along the inclined surface 25 of the first clamping frame 21, and the clamping edge 31 of the wedge portion 30 protrudes (approaches the second clamping frame 23), and this clamping edge 31 and the inner peripheral edge of the second clamping frame 23 clip both side surfaces of the crosspiece. By adjusting the amount of driving of the wedge portion 30, the clipping force between the clamping edge 31 and the inner peripheral edge of the second clamping frame 23 can be adjusted. To remove this connector from the connected state of the crosspiece, a tool such as a hammer or crowbar is engaged with the flat portion 38, and force is applied to the flat portion 28 in a direction away from the upper edge of the head portion 24, for example, as a fulcrum.

[0024] The present invention is not limited to the above-described embodiments shown in the drawings, but can be modified appropriately within the scope of the present invention. [Explanation of symbols]

[0025] 10 Connection part 20 Frame 21 First clamping frame 23 Second clamping frame 25 Slope 26-pin 30 Wedge 31 Clamping edge 35 Guided edge 36 Guide groove 38 Flat area

Claims

1. A connector for formwork panels comprising a frame portion and a wedge portion, The frame portion includes a pair of clamping frames facing each other on both sides of the batten of the form panel, and the distance between the pair of clamping frames is greater than the width between the both sides of the batten, The wedge portion is attached to one of the clamping frames so as to be movable in the forward and backward directions of the clamping frames, and as it moves toward the front side of the clamping frame, it protrudes from one of the clamping frames toward the other clamping frame, and the wedge portion and the other clamping frame clip both sides of the crosspiece. This is a formwork panel connector.

2. the one clamping frame has an inclined surface on the front side approaching the other clamping frame, the wedge portion has a guided surface that slides along the inclined surface and a clamping surface that faces the other clamping frame, The connector according to claim 1 , wherein when the wedge portion is moved forward, the guided surface slides along the inclined surface, and the clamping surface approaches the other clamping frame.

3. The connector according to claim 2 , wherein the clamping surface has an engaging portion that engages with a side surface of the crosspiece.

4. The frame portion is formed by bending a plate-like member, and the bent portion becomes the inclined surface, The connector according to claim 1 , wherein the wedge portion is a plate-like member inserted between the folded plate-like members.

5. The wedge portion has a guide groove formed along the inclined surface, and the frame portion has a pin. The connector according to claim 4 , wherein the pin is inserted into a guide groove of the wedge portion.

6. 6. The connector according to claim 5, wherein the guide groove is provided with a control portion that interferes with the pin to define the insertion limit of the wedge portion, and when the pin interferes with the control portion, the tip of the wedge portion does not protrude from the pair of clamping frames.

7. The connector according to claim 6, wherein a flat portion capable of receiving a strike from a hammer or the like is formed on the rear end of the wedge portion.

8. The connector according to claim 7 , wherein a gap is formed between the flat portion and the frame portion when the pin interferes with the control portion.

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