Formwork support member and formwork set

Abstract

To provide a formwork support member capable of facilitating the construction work of a rising part of a foundation.SOLUTION: A formwork support member 30 is a formwork support member for holding an external frame 20 and an internal frame 10 in a state facing each other constituting a rising part 2B of a foundation 2 by placing concrete between each other. The formwork support member includes: a support body 31 in which a cone member 31c having a female thread part 31e is provided at one end, and at the other end, a formwork receiving part 31d that supports the lower surface of the internal frame 10 is provided; and a fixing screw member 32 that supports the support body 31 in a cantilevered manner by the external frame 20 while holding external frame 20 between itself and a cone member 31c by screwing into the female thread part 31e of the cone member 31c from the outer surface side of the external frame 20 with the cone member 31c in contact with the inner surface of the external frame 20.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a formwork support member and formwork set that hold the outer formwork and inner formwork that form the raised portion of the foundation in a mutually opposing position by pouring concrete between them, and in particular to a formwork support member and formwork set that are suitable for a construction method in which the pressure-resistant plate portion of a mat foundation and the raised portion on the outer periphery are formed in a single concrete pour. [Background technology]

[0002] In a construction method in which the pressure-resistant plate and the outer peripheral rising portion of a mat foundation are constructed in a single concrete pour, the inner formwork, which is placed on the inner side of the rising portion, must be positioned so that it is floating above the top surface of the foundation, such as basal concrete. For this reason, a fixture has traditionally been used to support the underside of the inner formwork. The fixture is rod-shaped and has a formwork erection portion at its tip. After its base end is inserted into a hole in the outer formwork, a nut is screwed onto the inserted end, causing it to extend horizontally from the inner surface of the outer formwork. Therefore, by placing the inner formwork on the formwork erection portion, it becomes possible to position it so that it is floating above the pressure-resistant plate (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-31981 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the system described in Patent Document 1, the fasteners are inserted into holes in the outer formwork. This means that when removing the outer formwork after the poured concrete has hardened, the outer formwork must be moved along the direction of the fasteners, which is not necessarily desirable in terms of workability. After the concrete has hardened, the concrete surface and the outer formwork are fixed to each other. Therefore, moving the outer formwork along the direction of the fasteners, i.e., moving the outer formwork parallel to the concrete surface, requires a large force to simultaneously separate the entire fixed surface, which complicates the work. Furthermore, since the fasteners protrude from the raised portion after the outer formwork is removed, this requires the work of cutting them off, further complicating the work of constructing the raised portion of the foundation.

[0005] In view of the above-mentioned circumstances, an object of the present invention is to provide a form support member and a form set that can facilitate the work of constructing the rising portion of a foundation. [Means for solving the problem]

[0006] In order to achieve the above-mentioned object, the formwork support member of the present invention is a formwork support member that holds an outer formwork and an inner formwork, which form the rising portion of a foundation, facing each other by pouring concrete between them, and is characterized by comprising: a support body having a connecting portion at one end and a formwork receiving portion that supports the underside of the inner formwork at the other end; and a fixing member that penetrates the outer formwork from the outer surface side of the outer formwork and removably connects to the connecting portion while abutting the connecting portion against the inner surface of the outer formwork, thereby clamping the outer formwork between the connecting portion and the support body and cantilevering it on the outer formwork. [Effects of the Invention]

[0007] According to the present invention, when the connection between the fixing member and the connecting portion is released, no part protrudes from the outer surface of the hardened concrete. Therefore, there is no need to perform work such as cutting off the support body after removing the exterior formwork. Moreover, because there are no restrictions on the direction of movement when removing the exterior formwork, it is possible to, for example, tilt the exterior formwork using the lower edge as a fulcrum to pull the upper edge away from the concrete first, eliminating the need for large forces and providing other advantages in terms of workability when removing the exterior formwork. [Brief explanation of the drawings]

[0008] [Figure 1] This shows a formwork set that is an embodiment of the present invention, where (a) is a view of the external formwork alone from the outer surface side, (b) is a view of the assembled state from the outer periphery side, and (c) is a vertical cross-sectional view of (b). [Figure 2] FIG. 2 is a plan view of the main part of the form set shown in FIG. 1 in an assembled state. [Figure 3] FIG. 2 is an enlarged vertical cross-sectional view of the form set shown in FIG. [Figure 4] 2 is an enlarged view of the main part of the form set shown in FIG. 1, showing the connected state of the outer surface formwork, as viewed from the outer surface side. [Figure 5] 2 is a vertical cross-sectional view schematically showing a mat foundation to be constructed by the formwork set shown in FIG. 1. FIG. [Figure 6] 2 shows a form support member applied to the form set shown in FIG. 1, where (a) is a partially cutaway plan view, (b) is a side view, and (c) is a view taken along arrow C in (b). [Figure 7] This shows the state of the concrete poured into the formwork set shown in Figure 1 after it has hardened, with (a) being a vertical cross-sectional view of the state in which the fixing member has been removed from the support body of the formwork support member, and (b) being a vertical cross-sectional view of the state in which the outer formwork has been separated from the concrete. DETAILED DESCRIPTION OF THE INVENTION

[0009] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a form support member and a form set according to the present invention will be described in detail below with reference to the accompanying drawings. Figures 1 to 4 show a formwork set according to an embodiment of the present invention. As shown in Figure 5, the formwork set illustrated here is used to construct the foundation 2 of a building H, such as a detached house, and is particularly suitable for constructing a mat foundation 2, which has a pressure-resistant plate 2A and rising portions 2B and 2C on the top surface of a base 1, such as basin concrete, in a single concrete pour. As shown in Figures 1 to 4, this formwork set includes an inner formwork 10, an outer formwork 20, formwork support members 30, upper end reinforcing members 40, lower rail members 50, and width stop members 60.

[0010] The inner formwork 10 and the outer formwork 20 are plate-shaped with flat inner surfaces 10a, 20a, respectively, and concrete is poured between them with the inner surfaces 10a, 20a facing each other. The inner formwork 10 forms the inner surface 2Ba that protrudes upward from the top surface of the pressure plate portion 2A at the rising portion 2B provided on the outer periphery of the mat foundation 2. In this embodiment, the inner formwork 10 is a rectangular plate-shaped form made of metal such as steel.

[0011] The outer formwork 20 forms the outer surface 2Bb that protrudes upward from the top surface of the base 1 at the rising portion 2B provided on the outer periphery, and has a horizontally elongated rectangular shape whose vertical dimensions are larger than those of the inner formwork 10 by the thickness of the pressure-resistant plate portion 2A. In this embodiment, the outer formwork 20 is formed by a flat panel 21 and a frame member 22 attached to the outer surface of the panel 21. The panel 21 is a thin plate made of non-metallic material such as plywood. Although not shown in the figure, a resin film or a release agent is provided on the inner surface 20a of the panel 21 to improve release from hardened concrete.

[0012] The frame material 22 is formed into a hollow rectangular tube shape by extruding a metal such as an aluminum alloy, and is attached to the outer surface of the panel 21 along the upper edge, lower edge, and both side edges, as well as along the top and bottom at approximately the middle of the longitudinal length. In other words, on the outer surface of the panel 21, frame materials (hereinafter referred to as vertical frame materials 22a when distinguishing between them) along the top and bottom are attached at approximately equal intervals on both sides and in the middle.

[0013] Of these, two adjacent vertical frame members 22a on the left and right sides—in the illustrated example, the vertical frame member 22a on the right edge as viewed from the outer surface of the panel 21 and the vertical frame member 22a in the center—each have a support screw insertion hole 23, and the vertical frame members 22a on both sides have connecting screw insertion holes 24. The support screw insertion holes 23 are formed at a plurality of positions at different heights, perpendicular to the surface of the panel 21 in the lower portion of the vertical frame member 22a and penetrating the vertical frame member 22a and the panel 21. These support screw insertion holes 23 are for inserting fixing screws 32 of the formwork support member 30, which will be described later. The connecting screw insertion holes 24 are formed at the upper and lower ends of the vertical frame members 22a so as to penetrate approximately horizontally along the surface of the panel 21. These connecting screw insertion holes 24 are intended to connect the outer formworks 20 together by passing connecting screw members S through each of them when the outer formworks 20 are arranged side by side.

[0014] The frame material provided along the upper edge of panel 21 (hereinafter referred to as upper frame material 22b when distinguished) is attached close to the upper edge of panel 21. On the other hand, the frame material provided along the lower edge (hereinafter referred to as lower frame material 22c when distinguished) is attached with an insertion space 22d secured between it and the lower edge of panel 21, and is provided with a rail linking member 25 on its underside. The rail linking member 25 is attached to the lower frame material 22c in a state where it can rotate around an axis extending vertically, and can be detachably engaged with a lower rail member 50, which will be described later. In the illustrated example, one rail linking member 25 is provided in the approximate center of the outer formwork 20.

[0015] The formwork support member 30 holds the inner formwork 10 and the outer formwork 20 facing each other, and as shown in Figure 6, comprises a support body 31 and a fixing screw member 32. The support body 31 is rod-shaped and has a connecting male thread portion 31a at one end and an adjusting male thread portion 31b at the other end. The connecting male thread portion 31a is equipped with a cone member 31c, while the adjusting male thread portion 31b is equipped with a formwork receiving portion 31d.

[0016] The cone member 31c is molded from resin and has a truncated cone shape with a tapered outer periphery. A female thread 31e, which can be threaded with the connecting male thread 31a of the support body 31, is provided in the center of the cone member 31c and penetrates both end faces. The female thread 31e is provided on the inner periphery of a metal cylindrical member embedded in the center of the cone member 31c, for example. The connecting male thread 31a is detachably threaded onto the female thread 31e from the narrow end of the cone member 31c. The formwork receiving portion 31d supports the underside of the inner formwork 10. Its base end penetrates the adjusting male thread 31b via a screw insertion hole (not shown) and is sandwiched between nuts 31f and 31g threaded on both end faces. At the tip of formwork receiving portion 31d, outer receiving surface 31h that abuts against the outer surface of the inner formwork 10 and inner receiving surface 31i that abuts against the inner surface 10a of the inner formwork 10 are provided so as to protrude upward. In other words, by fitting the lower edge of the inner formwork 10 between outer receiving surface 31h and inner receiving surface 31i, it is possible to place the inner formwork 10 on the upper surface of formwork receiving portion 31d. The position of formwork receiving portion 31d can be changed as needed by adjusting the positions at which two nut members 31f, 31g are screwed into adjustment male thread portion 31b.

[0017] The fixing screw member 32 has a screw shank 32a that can be threaded into the female screw portion 31e of the cone member 31c, and a screw head 32b that has a larger diameter than the screw shank 32a. The length of the screw shank 32a is set to a dimension that allows it to protrude from the inner surface 20a of the panel 21 when inserted into the support screw insertion hole 23 of the outer formwork 20.

[0018] The upper end reinforcing member 40 is placed at the upper end of the external formwork 20 via retaining metal fittings 41, and is configured in a square tube shape formed from a metal such as an aluminum alloy, similar to the frame material 22. The illustrated upper end reinforcing member 40 has a larger cross section than the frame material 22 and is formed with a length greater than the overall length along the left and right of the external formwork 20, and can be placed along the upper frame material 22b provided along the upper edge of the panel 21 and across multiple external formworks 20 adjacent to the left and right.

[0019] The lower rail member 50 has an insertion groove 52 at one end of the mounting plate portion 51, and can be attached to the upper surface of the base 1 via the mounting plate portion 51 with the insertion groove 52 opening upward. The insertion groove 52 is for holding the exterior formwork 20 in an upright position with the lower edge of the panel 21 inserted into it. The lower rail member 50 is provided with an engagement piece 53. The engagement piece 53 engages with the rail linking member 25 when the rail linking member 25 is rotated with the lower edge of the panel 21 inserted into the insertion groove 52, thereby restricting upward movement of the exterior formwork 20 relative to the lower rail member 50. In this embodiment, the engagement piece 53 is formed on the lower rail member 50 by bending the upper edge of the side plate 52a closest to the mounting plate portion 51 of the two side plates 52a, 52b that make up the insertion groove 52. The width stopper member 60 is placed across the upper ends of the inner formwork 10 and the outer formwork 20 to prevent the distance between these formworks 10, 20 from changing.

[0020] When constructing the mat foundation 2 using the formwork set configured as described above, after appropriate reinforcement 70 is applied to the top surface of the base 1, the exterior formwork 20 is placed on the top surface of the base 1 via the lower rail member 50 in a portion of the base 1 that corresponds to the outer surface 2Bb of the rising portion 2B on the outer periphery. More specifically, after the lower rail member 50 is fixed to the top surface of the base 1 via the mounting plate 51, the lower end of the panel 21 is inserted into the insertion groove 52 of the lower rail member 50, and the rail connecting member 25 is operated to engage the lower rail member 50 with the lower frame member 22c of the exterior formwork 20. In this state, the rail connecting member 25 engages with the lower rail member 50, thereby preventing the exterior formwork 20 from moving upward relative to the base 1.

[0021] The form support members 30 may be attached to the exterior formwork 20 to be placed on the lower rail member 50 in advance, or they may be attached after the exterior formwork 20 is placed on the lower rail member 50. To attach the form support members 30 to the exterior formwork 20, the cone members 31c are abutted against the portions of the inner surface 20a of the panel 21 that face the support screw insertion holes 23, and in this state the fixing screw members 32 are screwed into the female thread portions 31e of the cone members 31c through the support screw insertion holes 23 of the vertical frame members 22a and the support screw insertion holes 23 of the panel 21. That is, by threading the fixing screw member 32 into the cone member 31c, it becomes possible to clamp the panel 21 of the exterior formwork 20 via the vertical frame member 22a between the end face of the cone member 31c and the screw head 32b of the fixing screw member 32, and as a result, the support portion body 31 of the formwork support member 30 is cantilevered in a state where it protrudes almost horizontally from the inner surface 20a of the panel 21. The support screw insertion hole 23 may be selected appropriately depending on the protrusion dimension of the rising portion 2B from the pressure-resistant platen portion 2A.

[0022] The left and right exterior formworks 20 arranged on the lower rail member 50 are connected to each other by passing connecting screws S through the connecting screw insertion holes 24 of the adjacent vertical frame members 22a, and the connection between them is reinforced by disposing upper-end reinforcing members 40 so as to span the retaining brackets 41 provided at the upper ends of each member. Furthermore, in the illustrated example, one end of a support member 80 is fixed to the base 1 or the ground, etc., and the other end is engaged with the connecting screws S that connect the upper parts of the vertical frame members 22a, thereby preventing the exterior formworks 20 from tipping outward. Corner members 90 are disposed at the protruding corners of the rising portions 2B to connect the exterior formworks 20 to each other.

[0023] If the inner formwork 10 is placed on the formwork receiving portion 31d of the formwork support member 30 in the above-described state, it will be possible to position the inner formwork 10 facing the outer formwork 20 while it is floating above the base 1. Then, by interposing the width stopper member 60 between the upper end of the outer formwork 20 and the upper end of the inner formwork 10, and pouring concrete between the inner surface 20a of the outer formwork 20 and the inner surface 10a of the inner formwork 10 in this state, the pressure-resistant plate portion 2A of the mat foundation 2 and the rising portion 2B on the outer periphery can be constructed in a single concrete pour.

[0024] In this case, according to the above-mentioned formwork set, the outer formwork 20 is formed by providing a frame material 22 on the outer surface of the panel 21, and the formwork support member 30 is arranged in a state in which it clamps the panel 21 and the frame material 22.This prevents the outer formwork 20 and the formwork support member 30 from tilting relative to each other even when concrete is poured, making it possible to construct the mat foundation 2 with high precision.

[0025] After the concrete hardens, the width stopper 60, connecting screw S, and upper-end reinforcement member 40 are removed, followed by the outer formwork 20 and lower rail member 50, completing the construction of the mat foundation 2. In the above-described formwork set, removing the fixing screw 32 from the cone member 31c eliminates any components protruding from the outer surface 2Bb of the concrete. This allows for unrestricted movement of the outer formwork 20 during removal. For example, as shown in Figure 7, tilting the outer formwork 20 around its lower edge as a fulcrum allows the upper edge to be pulled away from the concrete first, which is advantageous in terms of workability when removing the outer formwork 20. Furthermore, after removing the outer formwork 20, removing the cone member 31c and filling the area where the cone member 31c was located with a covering member allows for a large distance d from the outer surface 2Bb of the rising portion 2B to one end face of the connecting male thread 31a. As a result, even if the connecting male thread portion 31a of the support body 31 is made of a metal such as steel, there is no risk of external water such as rainwater coming into direct contact with it or penetrating into it, thereby preventing rust and other corrosion. Note that the inner formwork 10 is not exposed to the outside of the building H, and since it is made of a metal such as steel, it can be left as it is on the inner surface of the rising portion 2B.

[0026] In the above-described embodiment, the outer formwork is exemplified by a frame material attached to the outer surface of a panel, but an outer formwork composed only of panels may also be used. Also, cone members 31c with female threads 31e are exemplified as the connecting portions of the formwork support members, and fixing screw members 32 are exemplified as the fixing members, but the present invention is not limited to this. Furthermore, while the inner formwork 10 is exemplified as a rectangular plate made of metal such as steel, it is also possible to use a heat insulating material made of resin or wooden plywood (so-called plywood).

[0027] As described above, the formwork support member of the present invention is a formwork support member that holds the outer formwork and the inner formwork, which form the rising portion of the foundation, facing each other by pouring concrete between them, and is characterized by comprising a support body having a connecting portion at one end and a formwork receiving portion that supports the underside of the inner formwork at the other end, and a fixing member that penetrates the outer formwork from the outer surface side of the outer formwork and removably connects to the connecting portion while the connecting portion is abutted against the inner surface of the outer formwork, thereby clamping the outer formwork between the connecting portion and the support body and cantilevering it on the outer formwork. According to this invention, when the connection between the fixing member and the connecting part is released, no part protrudes from the outer surface of the hardened concrete. Therefore, there is no need to perform work such as cutting off the support body after removing the exterior formwork. Moreover, because there are no restrictions on the direction of movement when removing the exterior formwork, it is possible, for example, to tilt the exterior formwork using the lower edge as a fulcrum to pull the upper edge away from the concrete first, eliminating the need for large forces and providing other advantages in terms of workability when removing the exterior formwork.

[0028] The present invention is also characterized in that, in the above-mentioned formwork support member, the connecting portion has a female thread portion, and the fixing member has a screw shank portion that is detachably threaded into the female thread portion of the connecting portion and is composed of a fixing screw member having a screw head with a larger diameter than the screw shank portion, and the outer formwork is clamped between the screw head and the connecting portion. According to this invention, by screwing a fixing screw member into the female threaded portion of the connecting portion, the support main body can be connected to the floor-mounted screw member, thereby facilitating the work of attaching the support main body to the outer formwork.

[0029] Furthermore, the present invention is characterized in that, in the above-mentioned formwork support member, the support body has a connecting male threaded portion at one end, the connecting portion is a cone member having a tapered outer surface and having the female threaded portion passing through the center, the connecting male threaded portion being screwed into one end of the female threaded portion, and the fixing screw member being screwed into the other end of the female threaded portion. According to this invention, after removing the cone from the hardened concrete, filling the area where the cone was located with a covering material makes it possible to ensure a large distance from the outer peripheral surface of the raised portion to one end of the connecting male thread. This eliminates the risk of external water, such as rainwater, coming into direct contact with the support body or penetrating into it, thereby preventing rust and other corrosion.

[0030] The present invention is also characterized in that, in the above-mentioned formwork support member, the support body has an adjustment male screw portion at the other end, and the formwork receiving portion is sandwiched between two nut members that screw into the adjustment male screw portion. According to this invention, it is possible to adjust the position of the form receiving portion.

[0031] The formwork set according to the present invention is characterized by comprising an outer formwork and an inner formwork between which concrete is poured, and the formwork support member described above. According to this invention, when the connection between the fixing member and the connecting part is released, no part protrudes from the outer surface of the hardened concrete. Therefore, there is no need to perform work such as cutting off the support body after removing the exterior formwork. Moreover, because there are no restrictions on the direction of movement when removing the exterior formwork, it is possible, for example, to tilt the exterior formwork using the lower edge as a fulcrum to pull the upper edge away from the concrete first, eliminating the need for large forces and providing other advantages in terms of workability when removing the exterior formwork. [Explanation of symbols]

[0032] 2 mat foundation, 2B rising part, 10 inner surface formwork, 10a inner surface, 20 outer surface formwork, 20a inner surface, 21 panel, 22 frame material, 30 formwork support member, 31 support part body, 31a connecting male screw part, 31b adjusting male screw part, 31c cone member, 31d formwork receiving part, 31e female screw part, 31f, 31g nut member, 32 fixing screw member, 32a screw shaft part, 32b screw head

Claims

1. A formwork support member that holds an outer formwork and an inner formwork that form the rising part of the foundation by pouring concrete between them in a mutually opposing state, a support body having a connecting portion at one end and a form receiving portion at the other end for supporting the lower surface of the inner formwork; a fixing member that is detachably connected to the connecting portion by penetrating the outer surface side of the outer surface formframe from the outer surface side of the outer surface formframe with the connecting portion abutting against the inner surface of the outer surface formframe, thereby clamping the outer surface formframe between itself and the connecting portion and cantilevering the support portion main body on the outer surface formframe; A formwork support member comprising:

2. The connecting portion has a female thread portion, The formwork support member described in claim 1, characterized in that the fixing member has a screw shaft portion that is detachably threaded into the female thread portion of the connecting portion, and is composed of a fixing screw member having a screw head with a larger diameter than the screw shaft portion, and the external formwork is clamped between the screw head and the connecting portion.

3. The support body has a male threaded portion for connection at one end thereof, the connecting portion is a cone member having a tapered outer peripheral surface and a center portion through which the female screw portion passes, and the connecting male screw portion is screwed into one end of the female screw portion, The form support member according to claim 2, wherein the fixing screw member is threadedly engaged with the other end of the female thread portion.

4. The support body has an adjustment male screw portion at the other end thereof, 2. The form support member according to claim 1, wherein the form receiving portion is sandwiched between two nut members that are screwed into the adjusting male thread portion.

5. A form set comprising an outer formwork and an inner formwork between which concrete is poured, and a formwork support member according to any one of claims 1 to 4.

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