Device for concrete formwork

Abstract

A device is described for a formwork for a concrete slab with a drip groove. The device has an elongated and generally flat bottom. A protrusion extending from the bottom is provided along or near the elongated first side of the bottom. A channel structure is arranged along the elongated second side of the bottom, the channel structure being adapted to receive and support the slab. When concrete is poured onto the device, the protrusion forms a drip groove offset from the elongated first edge.

Description

Technical Field

[0001] This invention relates to concrete formwork. More specifically, this invention relates to an apparatus for shaping concrete in building construction. Background Technology

[0002] The following references and descriptions of prior art or products are not intended, and should not be construed as, statements or admissions of common knowledge in the art. In particular, the following discussion of prior art does not involve content commonly or well known to those skilled in the art, but is helpful in understanding the inventive step of the invention, wherein the identification of relevant prior art suggestions is only part of it.

[0003] Concrete is widely used in building construction. Concrete slabs are commonly used in building projects to form structural cantilever sections or window sills. These sections extend beyond the sides of the building and cantilever over windows or glass panels, or form window sill structures. For such cantilever sections or window sills, good construction engineering includes drip grooves or recesses on the lower surface of the concrete slab. The function of the drip grooves is to prevent water flowing along the concrete surface and adhering to it from reaching the window or glass, allowing the water to fall off under gravity, thus forming a drip.

[0004] Drip grooves can be added to existing buildings by roughly chiseling out grooves on the cantilevered surface below. Ideally, drip grooves can be embedded in the concrete during the molding of the concrete slab.

[0005] Figure 1 illustrates a typical method for forming a drip groove. The structural slab is formed by pouring wet concrete into a formwork and allowing it to solidify. This formwork typically consists of a flat lower surface (e.g., a wooden board). Strips are placed on this lower surface to form the drip groove. These strips (as shown) can be slender wooden strips with a triangular wedge-shaped profile. Vertical wooden boards are used to define the edges of the concrete slab. Support is provided by wooden supports placed close to the vertical wooden boards. A second strip can be placed to form an angle within the concrete slab. In practice, this arrangement can be flawed for various reasons. For example, the strips often shift during concrete pouring, preventing the ideal drip groove from forming when the concrete solidifies. Similarly, the vertical wooden boards can slip, failing to provide a uniform vertical surface, thus preventing the concrete from forming ideal edges when solidifying.

[0006] The present invention aims to provide an apparatus for concrete formwork that improves upon the aforementioned disadvantages and deficiencies, or at least provides a practical alternative. Summary of the Invention

[0007] According to one aspect of the invention, an apparatus for concrete formwork is provided, the apparatus having an elongated and generally planar bottom; a protruding structure extending from the bottom is provided along or near the elongated first side of the bottom; a channel structure is arranged along an elongated second side of the bottom, the channel structure being adapted to receive and support a plate; wherein, when concrete is poured onto the apparatus, the protruding structure forms a drip groove offset from the elongated first side.

[0008] Preferably, the device of the present invention has an angled surface on the exterior of the channel structure for forming an angle in the concrete slab to be formed. The channel structure itself may have a clamping feature adapted to clamp and secure the received slab. In this embodiment, the clamping feature may include elongated tooth-like structures, preferably formed on the inner side of the channel wall. The channel walls may be parallel to each other. In another embodiment, one or both channel walls may be inclined inwards towards the channel to enhance the clamping effect when the slab is inserted into the channel.

[0009] The protrusion along or near the elongated first side of the device preferably has a triangular profile. In this embodiment, the triangular profile is preferably an isosceles triangle with a base longer than the other two sides. For example, the base may be approximately 25 mm long, and the other two sides may each be approximately 18 mm long.

[0010] The device of the present invention can be made of any suitable material. Preferably, it is made of a suitable plastic material, such as polyvinyl chloride (PVC). In this embodiment, the device can be manufactured by extrusion molding or other suitable methods.

[0011] The present invention also provides a method for forming a concrete slab with drip grooves, comprising the following steps: - Use the device of the present invention in the formwork used for the concrete slab; - Insert the plate into the channel structure of the device; - Pour concrete into the formwork; - To allow the concrete to solidify; and - Remove the template. Attached Figure Description

[0012] The invention can be better understood through the following non-limiting description of preferred embodiments, wherein: Figure 1 shows an elevation view according to a prior art arrangement for forming a concrete slab with drip grooves; Figure 2 A perspective view of one side of the device according to a preferred embodiment of the present invention is shown; Figure 3 It shows Figure 2 A perspective view of the front of the device shown; and Figure 4 It shows Figure 2 and Figure 3 Details of the channel structure of the device shown. Detailed Implementation

[0013] Figure 1 illustrates an arrangement of formwork for a concrete slab with drip grooves in the prior art. In this arrangement, the first strip 10 is a thin strip of wood attached to a flat lower surface, i.e., a wooden board 12, by nails or other means. The purpose of the strip 10 is to form drip grooves in the concrete slab 16.

[0014] Vertical wooden planks 18 define the edges of the concrete slab 16 and provide support by placing wooden supports 20 against it. A second strip 22 may be provided to form an angle in the concrete slab 16.

[0015] Once the concrete slab 16 has hardened, the wooden supports 20, the wooden planks 12, and the strips 10 and 22 will be removed.

[0016] Setting up a template for the existing layout is time-consuming, requiring precise and stable placement of the strips 10 and 22, proper positioning of the vertical planks 18, and stability of the wooden supports 20. If any of these are unstable or improperly positioned, the resulting concrete slab 16 may exhibit problems such as poor drip groove formation, uneven vertical edges leading to breakage or cracking, and poor bevel formation.

[0017] Figure 2 A preferred embodiment of an apparatus for making concrete formwork is shown.

[0018] The device 24 has an elongated flat bottom 26. A raised structure 30 is provided on an elongated side 28 adjacent to the device 24. When concrete is poured onto the device 24 and solidifies, the raised structure 30 forms a drip groove in the concrete formwork.

[0019] The raised structure 30 is shown with a triangular wedge-shaped profile, which can form a V-shaped drip groove when the concrete slab solidifies. It should be understood that different profile shapes can be used depending on the characteristics and shape of the required drip groove.

[0020] An integrated channel structure 32 is provided near another elongated side of the device. During use, the channel structure 32 is used to receive and support plates or other flat materials (not shown) to define the edges of the concrete formwork.

[0021] As shown in the figure, the channel structure 32 is defined by a first wall 34 and a second wall 38. The generally vertical first wall 34 extends from and along the side 36 of the device 24, and the second wall 38 extends generally parallel to the first wall 34. As shown in the figure, the second wall 38 preferably has an angled outer surface 40, which can form an oblique angle when the concrete slab is formed and solidified.

[0022] refer to Figure 2 and Figure 3 The channel structure 32 is provided with clamping features, specifically elongated teeth 42 formed on the walls 34 and 38 respectively, to assist in clamping and fixing the supported plate (not shown). It should be understood that other forms of clamping features may be used.

[0023] In this embodiment, Figure 3 Dimensional examples are shown. The first wall 34 is approximately 27 mm high, while the second wall 38 is significantly shorter. The base plate 44 of the channel structure 32 is approximately 17 mm wide. The bottom of the angled outer surface 40 is approximately 18 mm high, and the distance between it and the raised structure 30 is approximately 57 mm. The bottom of the raised structure 30 is approximately 25 mm high, and each side is approximately 18 mm high.

[0024] Figure 4 The details of the channel structure 32 shown indicate that the first wall 34 is not completely parallel to the second wall 38, but rather inclined towards the second wall 38 at an angle of approximately 88 degrees. This helps the elongated teeth 42 to more firmly clamp the supported plate (not shown). It should be noted that... Figure 3 and Figure 4 Only some teeth 42 are marked in the text.

[0025] exist Figure 4 In the middle, the height of the second wall 38 is approximately 18 mm. The height of the bottom of the plane 26 is approximately 2 mm.

[0026] Device 24 is designed as a single-piece molding unit. It should be understood that a variety of suitable materials can be used to manufacture this device. In a preferred embodiment, a plastic material (such as PVC) is used, and the device is molded using a suitable technique (such as extrusion molding).

[0027] The device is preferably formed in a length of approximately 3 meters. For longer templates, multiple devices can be laid end to end. The preferred material of the device allows it to be cut to the desired length. In an exemplary embodiment, a break structure can be provided at a selected length of the device to facilitate cutting.

[0028] The term “comprising” and variations thereof, such as “including” or “having”, are used herein to mean including the stated one or more wholes, but not excluding any other one or more wholes, unless an exclusive interpretation of the term is required in the context or in use.

[0029] Those skilled in the art will understand that the invention described herein is susceptible to variations and modifications beyond the specific description. All such variations and modifications should be considered within the scope and spirit of the invention, the nature of which should be determined from the foregoing description. One example is an elongated planar bottom that extends beyond a raised structure designed to form a drip groove in a concrete slab.

[0030] Industrial applicability Those skilled in the art will understand that embodiments of the device of the present invention can overcome the defects of the prior art arrangement shown in FIG1, while providing a more efficient way to form a concrete slab having well-defined drip grooves, bevels and vertical edges.

Claims

1. An apparatus for concrete formwork, the apparatus having an elongated and generally planar bottom; a protrusion extending from the bottom is provided along or near an elongated first side of the bottom; a channel structure is arranged along an elongated second side of the bottom, the channel structure being adapted to receive and support the formwork; wherein, When concrete is poured onto the device, the raised structure forms a drip groove that deviates from the elongated first edge.

2. The apparatus of claim 1, wherein the channel configuration includes an angled surface, the angled surface being used to form an oblique angle.

3. The apparatus according to claim 1 or 2, wherein, The channel structure is provided with clamping features, which are adapted to clamp and fix the supported plate.

4. The device according to claim 3, wherein the clamping feature is an elongated toothed structure.

5. The device according to any one of claims 1 to 4, wherein the protrusion has a triangular profile.

6. The apparatus according to any one of claims 1 to 5, wherein the channel configuration comprises: - A generally vertical first wall, extending from and along the second side of the device; and - A second wall, which extends substantially vertically and is substantially parallel to the first wall.

7. The apparatus according to any one of claims 1 to 5, wherein the channel configuration comprises: - A generally vertical first wall, extending from and along the second side of the device; and - The second wall is inclined at an angle of approximately 88 degrees to the first wall.

8. The device according to any one of claims 1 to 7, wherein the device is made of PVC.

9. A method for forming a concrete slab with drip grooves, comprising the following steps: - The device according to any one of claims 1 to 8 is used in the formwork of the concrete slab; - Insert the sheet metal into the channel structure of the device; - Pour concrete into the formwork; - Allow the concrete to solidify; as well as - Remove the template.

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