Formwork tilt prevention support device and mat foundation construction method

Abstract

To provide a form tilting preventing support tool easy to attach to the form and to adjust the position, and reliably exerting a tilting prevention effect, and a mat foundation construction method.SOLUTION: A form tilting preventing support tool comprises: a first base part 11 having length corresponding to longitudinal thickness of the side end parts 102 of a first form 101 and abutting on the surface of the side end parts 102; a first clip part 12 integrally provided with the first base part 11 and sandwiching a vertical crosspiece 103 of the first form 101 between itself and the first base part 11; a second base part 21 with base end parts integrally connected with the base end parts of the first base part 11, and having length corresponding to the longitudinal thickness of the side end part 202 of a second form 201 and abutting on the surface of the side end part 202; a second clip part 22 integrally provided with the second base part 21 and sandwiching a vertical crosspiece 203 of the second form 201 between itself and the second base part 21; and a snap-off portion 30 formed at a boundary of the first base part 11 and the second base part 21 and separating the first and second base parts 11, 21 by snapping off.SELECTED DRAWING: Figure 7

Description

[Technical field]

[0001] The present invention relates to a support for preventing formwork from tipping over used in concrete foundation work and a method for constructing a mat foundation. [Background technology]

[0002] Conventionally, in concrete foundation work for houses and other structures, a two-step pouring method is used in which concrete is poured in two steps, once for the base section and once for the slab section. In this method, supports have been proposed to prevent the formwork from tilting outward.

[0003] For example, a formwork tilt prevention support has been proposed in which a number of through holes are drilled in the longitudinal direction of a thin steel plate formed into a rectangular shape of a predetermined length, one end of which is clamped between the flanges of an adjacent formwork so that the other end faces the inside of the top surface of the base concrete being poured below the formwork, and the clamped other end is fastened by a connector inserted through the through holes and the connecting hole of a selected flange, thereby preventing the formwork from tilting when concrete is poured onto the base portion (see, for example, Patent Document 1, etc.).

[0004] In addition, a formwork anti-tip-over support has been proposed that is formed entirely from thin plate and includes a base that abuts against the side end surface of the formwork, an outer engagement portion that is integrated with the outer end of the base and engages with the outer corner of the formwork, an inner engagement portion that is integrated with the inner end of the base and engages with the inner corner of the formwork, and an anchor portion that is integrated with the inner end of the base and will be buried in the foundation concrete (see, for example, Patent Document 2, etc.).

[0005] According to the above-mentioned conventional technology, even when the ready-mix concrete for the slab foundation is poured, each formwork is held in place by supports to prevent the formwork from tipping over, and the slab foundation section is formed without any contamination caused by moisture leaking from the formwork or concrete (known as "slag", "goo", etc.). [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Utility Model Registration No. 3119713 [Patent Document 2] JP 2008-297723 A Summary of the Invention [Problem to be solved by the invention]

[0007] However, the formwork anti-tip support device described in Patent Document 1 requires the other end of the thin steel plate clamped between the flanges of the formwork to be fastened by inserting a connector through the through hole and the connecting hole in the flange, which poses the problem of being labor-intensive to install.

[0008] On the other hand, the formwork tilt prevention support described in Patent Document 2 can be attached to the formwork by engaging the outer and inner engaging parts without using any fasteners. However, it is anticipated that this formwork tilt prevention support may move downward due to an impact on the formwork before concrete is poured, or move downward due to the weight of the concrete when concrete is poured, and there is a concern that the formwork tilt prevention effect may decrease under such circumstances.

[0009] The present invention has been made in consideration of the above-mentioned problems, and aims to provide a formwork tilt prevention support device and a slab foundation construction method that are easy to attach to a formwork, easy to adjust in position, and can reliably prevent tilting. [Means for solving the problem]

[0010] The formwork tilt prevention support according to the present invention is a formwork tilt prevention support made of a thin plate used to hold a formwork when forming a concrete foundation, and includes a first base portion having a length corresponding to the front-to-rear thickness of a side end portion of a first formwork and abutting against the surface of the side end portion, a first clip portion provided integrally with the first base portion and clamped to a vertical beam portion of the first formwork between the first base portion and the first clip portion, a second base portion having a length corresponding to the front-to-rear thickness of a side end portion of a second formwork and abutting against the surface of the side end portion, and a second clip portion provided integrally with the second base portion. and a fold-off portion formed at the boundary between the first base and the second base for separating the first and second bases by folding and cutting. When the first clip portion is sandwiched between the vertical bar of the first formwork, the second base and the second clip portion are embedded in concrete and function as an anchor, and when the second clip portion is sandwiched between the vertical bar of the second formwork, the first base and the first clip portion are embedded in concrete and function as an anchor.

[0011] According to this configuration, when the first clip portion is clamped between the first base and the vertical slat of the first formwork, the second base and the second clip portion protrude from the front surface of the first formwork, and function as an anchor when buried in concrete in this state. On the other hand, when the second clip portion is clamped between the second base and the vertical slat of the second formwork, the first base and the first clip portion protrude from the front surface of the second formwork, and function as an anchor when buried in concrete in this state. Therefore, it is easy to attach to the formwork, and the position adjustment is easy, and it is possible to reliably exert the tilt prevention effect. In addition, it is possible to use the formwork tilt prevention support for two types of formwork by simply changing the orientation, and it is therefore not necessary to prepare formwork tilt prevention supports for different types of formwork.

[0012] The first and second clip portions are formed as leaf springs obtained by bending a part of a thin, elongated rectangular plate that is integral with the first and second base portions.

[0013] With this configuration, the first and second clip portions are formed as leaf springs, so that they are clamped by elastic deformation simply by inserting them into the vertical bar portions of the first and second formwork, respectively, thereby achieving the effect of extremely easy attachment to the first and second formwork.

[0014] The first clip portion and the second clip portion are provided so as to protrude from opposite sides of the first and second base portions.

[0015] With this configuration, the first clip portion and the second clip portion protrude from opposite sides of the first and second base portions, so that when the first clip portion is clamped to the vertical bar portion of the first formwork, the second clip portion is located on the side that does not face the vertical bar portion, and when the second clip portion is clamped to the vertical bar portion of the second formwork, the second clip portion is located on the side that does not face the vertical bar portion, thereby achieving the effect of smooth attachment to the formwork without unused clip portions interfering with attachment.

[0016] In addition, the first base has a first protruding piece whose tip protrudes from the surface opposite the first clip portion, and the second base has a second protruding piece whose tip protrudes from the surface opposite the second clip portion.

[0017] With this configuration, the installation height can be easily adjusted by hitting the first protruding piece from above with a hammer or the like while the first clip portion is clamped to the vertical bar portion of the first formwork, or the second protruding piece with the second clip portion clamped to the vertical bar portion of the second formwork, thereby pushing down the formwork anti-tip support.

[0018] The first base portion and the second base portion are provided at their upper and lower ends near the boundary therebetween with restricting pieces protruding from the same surface as the first and second protruding pieces.

[0019] According to this configuration, the upper and lower ends near the boundary between the first base and the second base are provided with regulating pieces protruding from the same side as the first and second protruding pieces, so that when the formwork anti-tip-support is pushed down, the regulating pieces come into contact with the adjacent formwork to regulate rotation, thereby achieving the effect of allowing the formwork anti-tip-support to be pushed down without tilting.

[0020] The folded portion includes at least one of a notch or a recessed groove formed at a boundary between a first base portion and the second base portion.

[0021] According to this configuration, at least one of a notch or a groove is formed at the boundary between the first base and the second base, which has the effect of making it possible to easily break off the boundary between the first base and the second base when dismantling the formwork.

[0022] The formwork tilt prevention support according to the present invention is a formwork tilt prevention support made of a thin plate used to hold a formwork when forming a concrete foundation, and includes a base portion having a length corresponding to the front-to-rear thickness of a side end portion of the formwork and abutting against a surface of the side end portion, a clip portion provided integrally with the base portion and sandwiched between the base portion and a vertical rib portion of the formwork, and an anchor portion integrated with a base end portion of the base portion and embedded in concrete when the clip portion is sandwiched between the vertical rib portion of the formwork. The clip portion is formed as a leaf spring in which a part of a thin plate integral with the base is cut at a right angle toward one side and bent parallel to the base, and the tip side is bent in a "V" shape in a plan view. .

[0023] With this configuration, when the clip part is clamped between the base and the vertical rail of the formwork, the anchor part protrudes from the front surface of the formwork and is embedded in the concrete in this state to function as an anchor. This provides the advantage that it is easy to attach to the formwork, easy to adjust the position, and can reliably prevent the formwork from tipping over.

[0024] The slab foundation construction method according to the present invention is a construction method for forming a base portion of a slab foundation and a continuous footing portion formed along the outer periphery of the base portion in concrete slab foundation construction, and includes a reinforcing bar arrangement process for arranging reinforcing bars on basin concrete, an outer formwork installation process for erecting a plurality of outer formworks along the outer periphery of the site after the reinforcing bar arrangement process, a temporary fixing process for temporarily fixing the formwork tipping prevention supports on the outer formworks above the planned height of the top end of the base portion, a base pouring process for pouring base concrete to form the base portion after the temporary fixing process, and a base concrete pouring process for pouring the base concrete after the base pouring process. The method includes a positioning step in which the formwork anti-tip support is pushed down to position at least a portion of it within the concrete before the concrete hardens; an inner formwork installation step in which, after the positioning step and after the base concrete has hardened, multiple inner formworks are erected facing each other on the inner side of the outer formwork; a slab foundation pouring step in which, after the inner formwork installation step, slab foundation concrete is poured between the outer formwork and the inner formwork to form the slab foundation portion; and a formwork dismantling step in which the outer formwork and the inner formwork are dismantled after the slab foundation concrete poured in the slab foundation pouring step has hardened.

[0025] According to this method, the formwork tilt prevention support is temporarily fixed above the planned height of the top end of the base part of the outer formwork in the temporary fixing step, and after the temporary fixing step, base concrete for forming the base part is poured in the base pouring step, so that the formwork tilt prevention support can be prevented from moving downward due to the weight of the concrete when the base concrete is poured. Also, after the base pouring step, before the base concrete hardens in the positioning step, the formwork tilt prevention support is pushed down to position and embed at least a part of it in the concrete, so that tilting of the outer formwork can be reliably prevented. Therefore, the effect of easily attaching to the formwork and easily adjusting the position is achieved, and tilt prevention effect can be reliably achieved. [Brief description of the drawings]

[0026] [Figure 1] 1 is a front view showing a formwork tipping prevention support device according to a first embodiment of the present invention. FIG. [Diagram 2] FIG. 2 is a rear view showing the formwork tipping prevention support device according to the first embodiment. [Diagram 3] FIG. 2 is a right side view showing the formwork tipping prevention support device according to the first embodiment. [Figure 4] FIG. 2 is a left side view showing the formwork tilt prevention support device according to the first embodiment. [Diagram 5] FIG. 2 is a plan view showing the formwork tilt prevention support device according to the first embodiment. [Figure 6] FIG. 2 is a bottom view showing the formwork tilt prevention support device according to the first embodiment. [Figure 7] FIG. 2 is a perspective view showing a formwork tilt prevention support device according to the first embodiment. [Figure 8] FIG. 2 is another perspective view showing the formwork tipping prevention support device according to the first embodiment. [Figure 9] 1 is a perspective view showing a state in which a formwork tilt prevention support device according to a first embodiment is attached to a first formwork. FIG. [Figure 10] 10 is an enlarged perspective view showing a portion viewed from the X-ray arrow in FIG. 9. [Figure 11] 10 is a cross-sectional view taken along line XI-XI in FIG. [Figure 12] 2 is a perspective view showing a state in which the formwork tilt prevention support device according to the first embodiment is attached to a second formwork. FIG. [Figure 13] 13 is an enlarged perspective view showing a portion viewed from the arrow XIII in FIG. 12. [Figure 14] 14 is a cross-sectional view taken along line XIV-XIV in FIG. 13. [Figure 15] FIG. 11 is a cross-sectional view of a construction site showing a temporary fastening process. [Figure 16] FIG. 11 is a cross-sectional view of a construction site showing the base pouring process. [Figure 17] FIG. 11 is a cross-sectional view of a construction site showing a positioning process. [Figure 18] This is a cross-sectional view of a construction site showing the inner formwork installation process. [Figure 19] This is a cross-sectional view of a construction site showing the process of pouring a slab footing. [Figure 20] This is a cross-sectional view of the construction site after the formwork dismantling process. [Figure 21] FIG. 5 is a front view showing a formwork tipping prevention support device according to a second embodiment of the present invention. [Figure 22] FIG. 11 is a rear view showing the formwork tipping prevention support device according to the second embodiment. [Figure 23] FIG. 11 is a right side view showing the formwork tipping prevention support device according to the second embodiment. [Figure 24] FIG. 11 is a left side view showing the formwork tipping prevention support device according to the second embodiment. [Diagram 25] FIG. 11 is a plan view showing a formwork tilt prevention support device according to a second embodiment. [Figure 26] FIG. 11 is a bottom view showing a formwork tilt prevention support device according to the second embodiment. [Figure 27] FIG. 11 is a perspective view showing a formwork tilt prevention support device according to a second embodiment. [Figure 28] FIG. 11 is another perspective view showing the formwork tipping prevention support device according to the second embodiment. [Figure 29] 11 showing a state in which a formwork tipping prevention support device according to a second embodiment is attached to a first formwork. FIG. [Diagram 30] 14 showing a state in which a formwork tipping prevention support device according to a second embodiment is attached to a second formwork. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0027] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the formwork tilt prevention support device according to the present invention will be described with reference to the drawings.

[0028] First Embodiment First, the configuration of the formwork tilt prevention support 1 according to the first embodiment of the present invention will be described with reference to Figs. 1 to 14. Fig. 1 is a front view of the formwork tilt prevention support 1, Fig. 2 is a rear view, Fig. 3 is a right side view, Fig. 4 is a left side view, Fig. 5 is a plan view, Fig. 6 is a bottom view, Fig. 7 is a perspective view, and Fig. 8 is another perspective view. Fig. 9 is a perspective view showing the formwork tilt prevention support 1 attached to the first formwork 101, Fig. 10 is an enlarged perspective view showing the X-line arrow portion of Fig. 9, and Fig. 11 is a cross-sectional view taken along line XI-XI in Fig. 9. Fig. 12 is a perspective view showing the formwork tilt prevention support 1 attached to the second formwork 201, Fig. 13 is an enlarged perspective view showing the XIII-line arrow portion of Fig. 12, and Fig. 14 is a cross-sectional view taken along line XIV-XIV in Fig. 13.

[0029] The formwork tilt prevention support 1 is a support made of a thin metal plate, used to prevent a formwork (hereinafter referred to as an outer formwork) arranged along the periphery of a site from tilting outward due to the weight of concrete when pouring the splay footing concrete in a two-step pouring method in which concrete is poured twice for a base part and a splay footing in concrete foundation construction for a house or the like. A plurality of types of outer formworks with different front and rear thicknesses are generally used. In this specification, a formwork with a side end 102 having a front and rear thickness of 50 mm is referred to as a first formwork 101 (see FIG. 9). The first formwork 101 has vertical rib parts 103 extending in the vertical direction at both left and right ends. Also, a formwork with a side end 202 having a front and rear thickness of 45 mm is referred to as a second formwork 201 (see FIG. 12). The second formwork 201 has vertical rib parts 203 extending in the vertical direction at both left and right ends. The formwork tipping prevention support device 1 can be commonly used for two types of formwork, the first formwork 101 and the second formwork 201.

[0030] The formwork tip-prevention support device 1 is made by processing a thin, elongated rectangular steel plate, and as shown in Figure 1, is composed of a first base portion 11, a first clip portion 12, a first protruding piece 13, a second base portion 21, a second clip portion 22, a second protruding piece 23, and a fold-off portion 30.

[0031] The first base portion 11 is a flat plate-like portion that has a length corresponding to the front-rear thickness of the side end portion 102 of the first mold form 101 and is brought into contact with the surface of the side end portion 102 .

[0032] The first clip portion 12 is provided integrally with the first base portion 11, and as shown in Figures 9 to 11, is clamped between the first base portion 11 and the vertical bar portion 103 of the first formwork 101. More specifically, the first clip portion 12 is formed as a leaf spring in which a central portion of the first base portion 11 is cut out and raised at a right angle toward one surface side into a rectangular shape, and the tip side is bent into an open V-shape in plan view.

[0033] The first protruding piece 13 is formed by bending the tip of the first base portion 11 at a right angle toward the opposite side to the first clip portion 12 and protruding therefrom.

[0034] The second base 21 is a flat plate-like portion whose base ends are integrally connected to the first base 11, and whose length corresponds to the front-to-rear thickness of the side end 202 of the second formwork 201, and which abuts against the surface of the side end 202.

[0035] The second clip portion 22 is provided integrally with the second base portion 21, and is clamped between the second base portion 21 and the vertical bar portion 203 of the second formwork 201, as shown in Figs. 12 to 14. More specifically, the second clip portion 22 is formed as a leaf spring in which the central portion of the second base portion 21 is cut out and raised toward the other side at a right angle into a rectangular shape, and the tip side is bent into an open V-shape in plan view. The first clip portion 12 and the second clip portion 22 are provided protruding from opposite sides of both surfaces of the first and second base portions 11, 21.

[0036] The second protruding piece 23 is formed by bending the tip of the second base portion 21 at a right angle toward the opposite side to the second clip portion 22 and protruding therefrom.

[0037] The slit portion 30 is provided at the boundary between the first base portion 11 and the second base portion 21, and is a portion that makes it easy to separate the first and second base portions 11, 21 by slitting. The slit portion 30 has notches 31, 31 and a groove 32. The notch portion 31 is a V-shaped notch formed at the upper end and the lower end of the boundary between the first base portion 11 and the second base portion 21. The groove 32 is a thin groove formed along the boundary between the first base portion 11 and the second base portion 21. In this embodiment, the groove 32 is formed on the surface on the protruding side of the first clip portion 12 at the boundary between the first base portion 11 and the second base portion 21.

[0038] Next, a method for constructing a concrete foundation using the formwork tilt prevention support 1 according to this embodiment will be described with reference to Fig. 15 to Fig. 20. Fig. 15 is a cross-sectional view of a construction site showing the steps from pouring basin concrete to temporary fixing, Fig. 16 is a step of pouring the base, Fig. 17 is a positioning step, Fig. 18 is a step of installing the inner formwork, Fig. 19 is a step of pouring the slab footing, and Fig. 20 is a step after dismantling the formwork.

[0039] In the construction method for a mat foundation of this embodiment, first, the ground on the site where the building is to be constructed is excavated to a predetermined size and depth and leveled, and then a basin concrete pouring process is carried out. In the basin concrete pouring process, crushed stone 50 is laid and compacted, and basin concrete 52 is poured on top of it. After the basin concrete 52 has cured, the positions of the reinforcing bars and formwork are marked out (see FIG. 15).

[0040] Next, a reinforcing bar arrangement process is performed in which reinforcing bars 3 are arranged in the horizontal and vertical directions in the basing concrete 52 via spacer blocks 54 (see FIG. 15).

[0041] Next, an outer form installation process is performed. In the outer form installation process, an outer form SK is erected along the periphery of the site. Specifically, a plurality of outer forms SK, ie, first form 101 or second form 201, are erected and supported continuously in the longitudinal direction on the ground via form supports 58 (see FIG. 15).

[0042] Next, a temporary fixing process is performed to temporarily fix the formwork tilt prevention support 1 to the outer formwork SK. In the temporary fixing process, the formwork tilt prevention support 1 is temporarily fixed to the outer formwork SK above the planned height BL of the base top end. For example, when a first formwork 101 is used as the outer formwork SK, the formwork tilt prevention support 1 is placed in a horizontal position with the first base 11 and the first clip portion 12 facing outward and the second base 21 and the second clip portion 22 facing inward (i.e., positions facing above the concrete of the base portion B), and the first clip portion 12 is sandwiched between the first base 11 and the vertical beam portion 103 of the first formwork 101 (see Figs. 9 to 11 and 15). On the other hand, when the second formwork 201 is used as the outer formwork SK, the formwork anti-tip-over support device 1 is placed in a horizontal position with the second base 21 and the second clip portion 22 on the outer side and the first base 11 and the first clip portion 12 on the inner side, and the second clip portion 22 is clamped to the vertical bar portion 203 of the second formwork 201 between the second base 21 (see Figures 12 to 14 and 15).

[0043] After the temporary fixing process, a base pouring process is carried out in which base concrete is poured to form the base B (see FIG. 16). In the base pouring process, fresh concrete is poured into the area surrounded by the outer formwork SK up to the planned height BL of the base top end. At this time, the formwork tipping prevention supports 1 are temporarily fixed in the outer formwork SK above the planned height BL of the base top end, so they are prevented from moving downward due to the weight of the fresh concrete.

[0044] Next, after the base pouring step, before the base concrete hardens, a positioning step is performed in which the formwork tilt prevention support 1 is pushed down to position at least a part of it in the concrete (see FIG. 17). For example, when the first formwork 101 is used as the outer formwork SK, the formwork tilt prevention support 1 is pushed down by hitting the upper surface of the first protruding piece 13 with a tool such as a hammer. The formwork tilt prevention support 1 is positioned and embedded in the base concrete such that at least half of the lower end of the second base part 21, the second clip part 22, and the second protruding piece 23 protruding inward from the outer formwork SK, and preferably the entirety of the second base part 21, the second clip part 22, and the second protruding piece 23, are positioned at the bottom of the base concrete. On the other hand, when the second formwork 201 is used as the outer formwork SK, the formwork tilt prevention support 1 is pushed down by hitting the upper surface of the second protruding piece 23 with a tool such as a hammer. The formwork tipping prevention support device 1 is positioned and buried in the base concrete such that at least half of the lower ends of the first base portion 11, first clip portion 12 and first protruding piece 13, which protrude inward from the outer formwork SK, and preferably the entirety of them.

[0045] After the positioning step and after the base concrete has hardened, an inner form installation step is performed in which multiple inner forms UK are erected facing each other on the inner periphery of the outer form SK (see FIG. 18). Subsequently, after the inner form installation step, a slab concrete pouring step is performed in which slab concrete is poured to form a slab portion N between the outer form SK and the inner form UK (see FIG. 19).

[0046] After the curing period of the slab concrete has elapsed and the slab concrete poured in the slab concrete pouring process has hardened, the formwork dismantling process is finally carried out to dismantle the outer formwork SK and the inner formwork UK (see FIG. 20). In the formwork dismantling process, all of the outer formwork SK and the inner formwork UK are dismantled, the ground is leveled, and the construction of the mat foundation is completed. Then, when the outer formwork SK is dismantled, the formwork tipping prevention support 1 is broken at the break-off portion 30. As a result, for example, when the first formwork 101 is used as the outer formwork SK, the first base portion 11 protruding outward from the base portion B is separated together with the first clip portion 12 and the first protruding piece 13, and excess protrusions are removed from the outer peripheral surface of the base portion B, resulting in a flat surface. On the other hand, when the second formwork 201 is used as the outer formwork SK, the second base portion 21 protruding outward from the base portion B is separated together with the second clip portion 22 and the second protruding piece 23, removing excess protrusions from the outer peripheral surface of the base portion B and resulting in a flat surface.

[0047] As is clear from the above detailed description, the formwork tilt prevention support 1 according to this embodiment is a support made of a thin plate used to hold a formwork when forming a concrete foundation, and includes a first base 11 having a length corresponding to the front-to-rear thickness of a side end 102 of a first formwork 101 and abutting against the surface of the side end 102, a first clip portion 12 provided integrally with the first base 11 and clamped to a vertical beam portion 103 of the first formwork 101 between the first base 11 and the first clip portion 12, a second base 21 having a length corresponding to the front-to-rear thickness of a side end 202 of a second formwork 201 and abutting against the surface of the side end 202, and a second base 21 having a base end integrally connected to the first base 11 and a base end The clip portion 22 is provided integrally with the first base 11 and is clamped to the vertical bar portion 203 of the second formwork 201 between the first base 11 and the second base 21, and a fold-off portion 30 is formed at the boundary between the first base 11 and the second base 21 for separating the first and second bases 11 and 21 by folding and cutting. When the first clip portion 12 is clamped to the vertical bar portion 103 of the first formwork 101, the second base 21 and the second clip portion 22 are embedded in concrete and function as an anchor, and when the second clip portion 22 is clamped to the vertical bar portion 203 of the second formwork 201, the first base 11 and the first clip portion 12 are embedded in concrete and function as an anchor.

[0048] According to this configuration, when the first clip portion 12 is clamped to the vertical rib portion 103 of the first formwork 101 between the first base portion 11, the second base portion 21 and the second clip portion 22 protrude from the front surface of the first formwork 101, and thus function as an anchor when buried in concrete in this state. On the other hand, when the second clip portion 22 is clamped to the vertical rib portion 203 of the second formwork 201 between the second base portion 21, the first base portion 11 and the first clip portion 12 protrude from the front surface of the second formwork 201, and thus function as an anchor when buried in concrete in this state. Therefore, it is easy to attach to the formwork, and the position adjustment is easy, and it is possible to reliably exert the tilt prevention effect. In addition, it is possible to use the formwork tilt prevention support 1 for two types of the first formwork 101 and the second formwork 201 simply by changing the direction in which it is attached, and therefore it is not necessary to prepare formwork tilt prevention supports according to the type of formwork.

[0049] The first and second clip portions 12, 22 are formed as leaf springs obtained by bending a part of a thin, elongated rectangular plate that is integral with the first and second base portions 11, .

[0050] According to this configuration, the first and second clip portions 12, 22 are formed as leaf springs, so that they are clamped by elastic deformation simply by inserting them into the vertical bar portions 103, 203 of the first and second formworks 101, 201, respectively, thereby achieving the effect of extremely easily attaching them to the first and second formworks 101, 201.

[0051] The first clip portion 12 and the second clip portion 22 are provided so as to protrude from both surfaces of the first and second base portions 11, 21 opposite to each other.

[0052] According to this configuration, the first clip portion 12 and the second clip portion 22 are protruding from opposite sides of both the first and second base portions 11, 21, so that when the first clip portion 12 is clamped to the vertical bar portion 103 of the first formwork 101, the second clip portion 22 is positioned on the side that does not face the vertical bar portion 103, and when the second clip portion 22 is clamped to the vertical bar portion 203 of the second formwork 201, the first clip portion 12 is positioned on the side that does not face the vertical bar portion 203, thereby achieving the effect of smooth attachment to the formwork without unused clip portions interfering with attachment.

[0053] In addition, the first base 11 has a first protruding piece 13 whose tip protrudes from the surface opposite the first clip portion 12, and the second base 21 has a second protruding piece 23 whose tip protrudes from the surface opposite the second clip portion 22.

[0054] With this configuration, the first clip portion 12 is clamped to the vertical bar portion 103 of the first formwork 101, and the first protruding piece 13, or the second clip portion 22 is clamped to the vertical bar portion 203 of the second formwork 201, and the second protruding piece 23 is clamped to the vertical bar portion 203 of the second formwork 201, and the first clip portion 12 is clamped to the vertical bar portion 203 of the first formwork 101. With this configuration, the installation height can be easily adjusted by hitting the first protruding piece 13 from above with a hammer or the like to push down the formwork anti-tip support device 1 or 2.

[0055] The slab foundation construction method according to the present invention is a construction method for forming a base portion B of a slab foundation and a strip footing portion N formed along the outer periphery of the base portion B in concrete slab foundation construction, and includes a reinforcing bar arrangement process for arranging reinforcing bars on basin concrete 52, an outer formwork installation process for erecting a plurality of outer formworks SK along the outer periphery of the site after the reinforcing bar arrangement process, a temporary fixing process for temporarily fixing formwork tipping prevention supports 1 on the outer formworks SK above the planned height BL of the top end of the base portion, a base pouring process for pouring base concrete to form the base portion B after the temporary fixing process, and Then, before the base concrete hardens, there is a positioning process in which the formwork anti-tip support 1 is pushed down to position at least a portion of it in the concrete, an inner formwork installation process in which multiple inner formworks UK are erected facing each other on the inner side of the outer formwork SK after the positioning process and after the base concrete hardens, a slab foundation pouring process in which slab foundation concrete is poured to form a slab foundation section N between the outer formwork SK and the inner formwork UK after the slab foundation concrete poured in the slab foundation pouring process hardens, and a formwork dismantling process in which the outer formwork SK and the inner formwork UK are dismantled.

[0056] According to this method, the formwork tipping prevention support 1 is temporarily fixed above the planned height BL of the base portion top end of the outer formwork SK in the temporary fixing step, and after the temporary fixing step, base concrete is poured to form the base portion B in the base pouring step, so that it is possible to prevent the formwork tipping prevention support 1 from moving downward due to the weight of the concrete when the base concrete is poured. In addition, after the base pouring step, before the base concrete hardens in the positioning step, the formwork tipping prevention support 1 is pushed down to position and embed at least a portion of it in the concrete, so that it is possible to reliably prevent the outer formwork SK from tipping in the slab foundation pouring step.

[0057] <Second embodiment> Next, the configuration of the formwork tilt prevention support 2 according to the second embodiment of the present invention will be described with reference to Figs. 21 to 30. Fig. 21 is a front view of the formwork tilt prevention support 2, Fig. 22 is a rear view, Fig. 23 is a right side view, Fig. 24 is a left side view, Fig. 25 is a plan view, Fig. 26 is a bottom view, Fig. 27 is a perspective view, and Fig. 28 is another perspective view. Fig. 29 is a cross-sectional view corresponding to Fig. 11 showing the formwork tilt prevention support 2 attached to the first formwork 101, and Fig. 30 is a cross-sectional view corresponding to Fig. 14 showing the formwork tilt prevention support 2 attached to the second formwork 201. The same components as those in the first embodiment are given the same reference numerals, and detailed descriptions thereof will be omitted.

[0058] The formwork anti-tip support device 2 is made by processing a thin, rectangular steel plate, and as shown in Figure 21, etc., is composed of a first base portion 11, a first clip portion 12, a first protruding piece 13, a second base portion 21, a second clip portion 22, a second protruding piece 23, a fold-off portion 30, and a regulating piece 33.

[0059] In the first embodiment, the first clip portion 12 and the second clip portion 22 are configured to protrude from opposite sides of both surfaces of the first and second base portions 11, 21, but in this embodiment, the second clip portion 22 is cut and raised to protrude from the same surface as the first clip portion 12. In addition, the first protruding piece 13 and the second protruding piece 23 are protruding from the surface opposite the first clip portion 12 and the second clip portion 22 with respect to the first base portion 11 and the second base portion 21.

[0060] In the first embodiment, the boundary between the first base 11 and the second base 21 is only one place, and is always the same whether the base is attached to the first formwork 101 or the second formwork 201. In contrast, in the present embodiment, the boundary between the first base 11 and the second base 21 is provided at two places: a line connecting the upper and lower cutouts 31a, 31a and a line connecting the upper and lower cutouts 31b, 31b. In the present embodiment, when the base is attached to the first formwork 101, the line connecting the upper and lower cutouts 31a, 31a becomes the boundary between the first base 11 and the second base 21, and when the base is attached to the second formwork 201, the line connecting the upper and lower cutouts 31b, 31b becomes the boundary between the first base 11 and the second base 21.

[0061] In this embodiment, furthermore, restricting pieces 33, 33 are provided at the upper and lower ends near the boundary between the first base 11 and the second base 21, protruding on the same side as the first and second protruding pieces 13, 23. Specifically, rectangular restricting pieces 33 are formed by bending horizontally to the same side as the first and second protruding pieces 13, 23 between the cutout portions 31a, 31b on the upper end side and between the cutout portions 31a, 31b on the lower end side.

[0062] According to this configuration, the upper and lower ends near the boundary between the first base 11 and the second base 21 are provided with regulating pieces 33, 33 protruding from the same surface as the first and second protruding pieces 13, 23, so that when the formwork tilt prevention support 1 is pushed down, the regulating pieces 33, 33 abut against the adjacent formwork to restrict rotation, thereby achieving the effect that the formwork tilt prevention support 2 can be pushed down while maintaining an approximately horizontal posture without tilting.

[0063] <Modification> The present invention is not limited to the above-mentioned embodiment, and various modifications can be made without departing from the spirit of the present invention. For example, in each of the above-mentioned embodiments, the configuration of the formwork tilt prevention support that can be used with both the first formwork 101 and the second formwork 201 is shown, but the present invention is not limited to this. For example, in the first embodiment, the second clip portion 22 and the second protruding piece 23 may be omitted to configure a formwork tilt prevention support exclusively for the first formwork 101.

[0064] In other words, the formwork anti-tip support of this modified example is a formwork anti-tip support made of a thin plate used to hold a formwork when forming a concrete foundation, and comprises a first base 11 having a length corresponding to the front-to-rear thickness of the side end 102 of the first formwork 101 and abutting against the surface of the side end 102, a first clip portion 12 formed integrally with the first base 11 and clamped to the vertical bar portion 103 of the first formwork 101 between the first base 11, and a second base 21 as an anchor portion that is integrated with the base end of the first base 11 and buried in the concrete when the first clip portion 12 is clamped to the vertical bar portion 103 of the first formwork 101.

[0065] According to this configuration, when the first clip portion 12 is clamped between the first base portion 11 and the vertical rail portion 103 of the first formwork 101, the second base portion 21 as an anchor portion protrudes from the front surface of the first formwork 101, and in this state is embedded in concrete and functions as an anchor. Therefore, it is easy to attach to the first formwork 101, the position can be easily adjusted, and the effect of preventing tipping over can be reliably achieved.

[0066] In addition, instead of the above-mentioned modified example, in the formwork tipping prevention support device 1 of the first embodiment, it is also possible to omit the first clip portion 12 and the first protruding piece 13 and configure it exclusively for the second formwork 201.

[0067] Furthermore, in the second embodiment, rectangular regulating pieces 33, 33 are provided at the top and bottom ends near the boundary between the first base 11 and the second base 21 and are bent horizontally, but the regulating pieces 33, 33 may be formed by protruding vertically and bending them parallel to the first and second protruding pieces 13, 23. According to this modification, the resistance that the regulating pieces 33, 33 receive from the fresh concrete is reduced when the formwork tipping prevention support 2 is pressed down in the positioning step, so that the position can be adjusted more smoothly.

[0068] <Additional Notes> Each embodiment shown in the drawings of this application includes a design that may be the subject of a design application. Specifically, the outer shape of the formwork tilt prevention support 1 according to the first embodiment or the formwork tilt prevention support 2 according to the second embodiment can be understood as the overall design of the product name "formwork tilt prevention support". [Explanation of symbols]

[0069] 1 Formwork tilt prevention support device (first embodiment) 2. Formwork tilt prevention support (second embodiment) 11 1st base 12 First clip part 13 1st protruding piece 21 Second base 22 Second clip part 23 Second protruding piece 30 Folding section 31 Cutout portion (first embodiment) 31a Cutout portion (second embodiment) 31b Cutout portion (second embodiment) 32 Groove 33 Regulatory piece 52 Waste concrete 101 First Formwork 102 Side edge 103 Vertical bar 201 Second Formwork 202 Side edge 203 Vertical bar B Base section BL Base top end planned height N Fabric base part SK outside formwork UK Inner Formwork

Claims

1. A formwork tilt prevention support device made of a thin plate used to hold a formwork when forming a concrete foundation, A first base portion having a length corresponding to a front-rear thickness of a side end portion of the first formwork and abutting against a surface of the side end portion; A first clip portion that is integral with the first base and is sandwiched between the first base and a vertical beam portion of the first formwork; a second base portion having a length corresponding to a front-rear thickness of a side end portion of a second formwork and abutting against a surface of the side end portion; A second clip portion that is integral with the second base and is sandwiched between the second base and a vertical beam portion of the second formwork; a fold-off portion formed at a boundary between the first base portion and the second base portion for separating the first and second base portions by folding; Equipped with When the first clip portion is clamped to the vertical beam portion of the first formwork, the second base portion and the second clip portion are embedded in concrete and function as an anchor, A formwork tip-prevention support device in which, when the second clip portion is clamped to the vertical bar portion of the second formwork, the first base portion and the first clip portion are embedded in concrete and function as an anchor.

2. The formwork tipping prevention support device according to claim 1 , wherein the first and second clip portions are formed as leaf springs formed by bending a portion of an elongated rectangular thin plate that is integral with the first and second base portions.

3. The formwork tipping prevention support device according to claim 2 , wherein the first clip portion and the second clip portion are provided so as to protrude from opposite sides of both surfaces of the first and second base portions.

4. The first base portion has a first protruding piece whose tip protrudes from a surface opposite to the first clip portion, The formwork tip-prevention support device according to claim 2 or 3, wherein the second base portion has a second protruding piece whose tip end protrudes from a surface opposite to the second clip portion.

5. The formwork tilt prevention support device as described in claim 4, further comprising a regulating piece protruding from the upper and lower ends near the boundary between the first base portion and the second base portion on the same side as the first and second protruding pieces.

6. The formwork tipping prevention support device according to claim 1 , wherein the fold-off portion includes at least one of a notch or a groove formed at the boundary between the first base portion and the second base portion.

7. A formwork tilt prevention support device made of a thin plate used to hold a formwork when forming a concrete foundation, A base portion having a length corresponding to the front-rear thickness of the side end portion of the formwork and abutting against the surface of the side end portion; A clip portion that is integral with the base and is clamped between the base and a vertical beam portion of the formwork; an anchor portion which is integrated with a base end of the base portion and is embedded in concrete when the clip portion is clamped to a vertical beam portion of the formwork; Equipped with The clip portion is a support for preventing formwork tipping, formed as a leaf spring by cutting a portion of a thin plate that is integral with the base at a right angle toward one side and bending it parallel to the base, with the tip side bent in a ``U'' shape when viewed from above.

8. A method for constructing a concrete mat foundation by forming a base part of the mat foundation and a strip foundation part formed along the periphery of the base part, comprising the steps of: A reinforcing bar arrangement process for arranging reinforcing bars on the basing concrete; After the reinforcing bar arrangement process, an outer form installation process of erecting a plurality of outer formworks along the periphery of the site; A temporary fixing process of temporarily fixing the formwork tilt prevention support device according to any one of claims 1 to 7 above a planned height of the top end of the base portion of the outer formwork; After the temporary fixing process, a base pouring process of pouring base concrete to form the base portion; A positioning step of pushing down the formwork tilt prevention support device to position at least a portion of the formwork tilt prevention support device in the concrete before the base concrete hardens after the base pouring step; After the positioning step, after the base concrete has hardened, an inner form installation step of erecting a plurality of inner forms facing each other on the inner periphery side of the outer form; After the inner formwork installation step, a slab concrete is poured between the outer formwork and the inner formwork to form the slab portion; A formwork dismantling process in which the outer formwork and the inner formwork are dismantled after the slab concrete poured in the slab pouring process has hardened; A method for constructing a slab foundation.

Images