Formwork connecting member

Abstract

To provide a connecting member for adjusting the dimensions of formwork used in constructing a concrete structure, capable of reducing the step on the concrete surface at the connecting portion.SOLUTION: The formwork connecting member is composed of a connecting body 1 that connects formwork A and B arranged on the left and right, and a reinforcing bar 2 that can be attached to and detached from the connecting body. The connecting body 1 includes a panel portion 11 of an appropriate size, a fixed connecting portion 12 provided at one end of the panel portion, an adjustable connecting portion 13 that connects and fixes the adjacent formwork B provided at the other end of the panel portion to the desired position, and an attachment receiver 14 for the reinforcing bar 2 on the back of the panel portion. The reinforcing bar 2 has an attachment portion (hook portion) 22 that is attached to a rod-shaped reinforcing portion 21 that is attached to and in contact with the back of the panel portion of the connecting body 1 to be attachable to and detachable from the attachment receiver.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a formwork connecting member used for adjusting the construction dimensions of a concrete formwork.

Background Art

[0002] In concrete placement work, the formwork used is either constructed directly on-site or, considering work efficiency, standardized products pre-formed are used. In addition to metal products, wooden formworks reinforced with frame timbers on the back of plywood panels are widely used for simple structures because they can be manufactured inexpensively, are lightweight, and easy to handle.

[0003] When the above-mentioned standardized products are adopted, the concrete placement range varies depending on the site conditions, resulting in areas with insufficient dimensions. As a countermeasure, formworks (Patent Documents 1, 2) and formwork connecting members (Patent Documents 3, 4) with a dimension adjustment function have been proposed.

[0004] The formwork with adjustable dimensions has a nested double structure, and the dimension adjustment is performed by the protruding length of the inner formwork (slide formwork). The formwork connecting member connects the formworks with insufficient dimensions, and a connecting structure part for connecting to the adjacent formwork is attached to the panel part covering the surface of the adjacent formwork.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Patent Document 2

Patent Document 3

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] In the panel portion and the connecting member portion of the exterior formwork provided with a dimensional adjustment function, the panel portion is preferably formed as thin as possible in order to reduce the step with the surface of the adjacent formwork. When formed thinly, reinforcement is required for the back portion of the panel portion to naturally withstand the pressure of the placed concrete. However, in the exterior formwork in Patent Documents 1, 2, and 3, since a reinforcing member cannot be provided on the back of the panel portion to freely house and retract the interior formwork, a corresponding strength and thickness are required for the panel portion.

[0007] Also, even if a reinforcing member (vertical bar) is provided in advance on the back of the panel portion like the connecting member described in Patent Document 4, a single bar body is insufficient because the connecting distance becomes short, and a multi-bar body cannot cope with a short connecting distance. Furthermore, the connecting structure with the adjacent formwork is not robust. Therefore, the present invention proposes a formwork connecting member provided with an independent reinforcing bar.

Means for Solving the Problem

[0008] The formwork connecting member according to claim 1 of the present invention is composed of a connecting body that connects formworks arranged on the left and right and a reinforcing bar body that is detachably attached to the connecting body. The connecting body includes a panel portion having a size corresponding to the formwork to be connected, a fixed connecting portion provided at one end of the panel portion for connecting and fixing an adjacent formwork, an adjustment connecting portion provided at the other end of the panel portion for connecting and fixing an adjacent formwork at a desired position, and a mounting receiving portion for the reinforcing bar body provided on the back of the panel portion. The reinforcing bar body is characterized in that a mounting portion for detachably mounting on the mounting receiving portion is attached to a rod-shaped reinforcing portion that abuts and is mounted on the back of the panel portion of the connecting body.

[0009] Thus, the end of one adjacent formwork is connected to the fixed connecting portion provided at one end of the connecting body, the end of the other adjacent formwork is placed along the back of the panel portion, and is connected and fixed at a predetermined position by the adjustment connecting portion provided at the other end. The reinforcing bar body is mounted on the mounting receiving portion at an appropriate position on the back of the panel portion between the adjacent formworks at both ends, and the rod-shaped reinforcing portion is brought into contact with the back of the panel portion. Therefore, even if the panel portion of the connecting member is formed of a thin metal plate, resin plate, or wooden board, the pressure of the placed concrete can be resisted by the reinforcing bar body.

[0010] The formwork connecting member according to claim 2 of the present invention is the above-mentioned formwork connecting member, wherein the connecting body has a flat box cylinder shape with a panel part on the front surface, and the back surface is formed in a beaded frame part shape (frame shape), and fixed connecting parts and adjustment connecting parts are provided at the left and right end opening parts, the upper and lower beaded frame parts on the back surface are used as mounting receiving parts, and the mounting part of the reinforcing bar is formed as a hook part that locks to the above-mentioned mounting receiving part.

[0011] Therefore, it is possible to easily form the mounting receiving part without requiring a special structure, and moreover, since the beaded frame part becomes the mounting receiving part, the mounting position of the reinforcing bar can be easily set at the optimum position.

Effect of the Invention

[0012] The configuration of the present invention is composed of the connecting body and the reinforcing bar that can be mounted at a desired position on the back surface of the panel part of the connecting body as described above. By countering the pressure of the placed concrete with the reinforcing bar, the panel part of the connecting body can be formed thinly, and it has a function of adjusting the dimensions of the formwork and can reduce the step on the surface of the placed concrete at the connection part.

Brief Description of the Drawings

[0013]

Figure 1

Figure 2

Figure 3

Figure 4

Mode for Carrying Out the Invention

[0014] Next, an embodiment of the present invention will be described. The formwork connecting member shown in the embodiment is composed of a connecting body 1 that connects adjacent formworks A and B, and a reinforcing bar 2 that is mounted on the connecting body 1. The formworks A and B shown in the embodiment are standard products with the back surface of the panel board a reinforced with the frame wood b.

[0015] The connecting body 1 has a flat box-cylindrical shape formed of a thin metal plate, and the opening end face has a size corresponding to the end face shape of the formworks A and B (a size into which the formwork end face can be inserted). The front face is a panel portion 11, and the back face is formed in a beaded frame portion shape (frame shape). A fixed connection portion 12 is provided on one opening end side, and an adjustment connection portion 13 is provided on the other opening end side.

[0016] The fixed connection portion 12 is configured by appropriately forming a plurality of nail holes 121 in the beaded frame portion on the back face. The adjustment connection portion 13 separates the beaded frame portion that becomes the edge of the end opening up and down, and projects a flange portion 131 at the separated end, and forms bolt holes 132 in the flange portion 131. Further, the upper and lower portions of the beaded frame portion constitute a mounting receiving portion 14.

[0017] The reinforcing bar body 2 is composed of a rod-shaped reinforcing portion 21 and a hook portion 22 serving as a mounting portion. The rod-shaped reinforcing portion 21 is a metal square column or a wooden column that is slightly shorter than the vertical length of the connecting body 1 and longer than the space between the upper and lower mounting receiving portions 14, and has a sufficient thickness to abut against the back face of the panel portion 11. The hook portion 22 is attached to the back face of the rod-shaped reinforcing portion 21 and has a gap that fits snugly into the upper and lower mounting receiving portions 14.

[0018] Thus, the above formwork connecting body adjusts the dimensions to connect the adjacent formworks A and B. Insert one adjacent formwork A into the fixed connection portion (end opening portion) 12, drive a nail 3 into the formwork b of the formwork A from the nail hole 121, and connect and fix the connecting body 1 and the formwork A.

[0019] At the adjustment connection portion 13 at the other end, insert the other formwork B from the end opening portion, adjust the dimensions of the entire formwork according to the insertion length of the formwork B, attach a bolt 4 to the bolt hole 132 of the flange portion 131, and threadedly attach a tightening nut 5 to compress the flange portion 131, and hold and fix the formwork B at the end opening portion.

[0020] The reinforcing cross member 2 may have its hook portion 22 locked in advance to the upper and lower mounting receivers (edge framing portions) 14 before the connection of the formwork B described above. Alternatively, after the formwork B is connected and fixed to the adjustment connection portion 13, the upper end side of the rod-shaped reinforcing portion 21 is inserted inside the upper mounting receiver (edge framing portion) 14, and with the lower end exceeding the lower mounting receiver (edge framing portion) 14, the lower end portion is inserted behind the lower mounting receiver 14, and the lower hook portion 22 may be locked in a state of being placed on the lower mounting receiver 14.

[0021] Therefore, the adjacent formworks A and B are dimensionally adjusted by the connection body 1. Even when the thin panel portion 11 receives the pressure of the placed concrete, it is prevented from being deflected by the reinforcing cross member 2. As a result, the panel portion 11 can be formed thinner, and the step at the corresponding location on the concrete surface can be reduced.

Explanation of Signs

[0022] 1 Connection body 11 Panel portion 12 Fixed connection portion 121 Nail hole 13 Adjustment connection portion 131 Flange portion 132 Bolt hole 14 Mounting receiver 2 Reinforcing cross member 21 Rod-shaped reinforcing portion 22 Hook portion 3 Nail 4 Bolt 5 Tightening nut A, B Formwork a Companel board b Frame timber

Claims

1. It is composed of a connecting body that connects formworks arranged on the left and right and a reinforcing bar that is detachably attached to the connecting body. The connecting body includes a panel portion sized to correspond to the formwork to be connected, a fixed connecting portion provided at one end of the panel portion for connecting and fixing an adjacent formwork, an adjustment connecting portion provided at the other end of the panel portion for connecting and fixing an adjacent formwork at a desired position, and a mounting receiving portion for the reinforcing bar provided on the back surface of the panel portion. The reinforcing bar is a formwork connecting member formed by attaching a mounting portion that is detachably mounted on the mounting receiving portion to a rod-shaped reinforcing portion that is mounted in contact with the back surface of the panel portion of the connecting body.

2. The connecting body has a flat box-cylindrical shape with the front surface being the panel portion and the back surface being formed in a beaded frame portion shape, and a fixed connecting portion and an adjustment connecting portion are provided at the open portions at the left and right ends. The beaded frame portions at the upper and lower ends of the back surface are used as the mounting receiving portions, and the mounting portion of the reinforcing bar is formed as a hook portion that locks to the mounting receiving portions. The formwork connecting member according to Claim 1.

3. The beaded frame portion at the open portion at the end is separated, a flange portion is formed at the separated end, and a clamping bolt and nut are attached to the flange portion to form an adjustment connecting portion for clamping and fixing an adjacent formwork at the open portion at the end. The formwork connecting member according to Claim 2.

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