JP7660890B2 - Formwork tilt prevention support device and mat foundation construction method - Google Patents

Description

The present invention relates to a formwork tilt prevention support device used in concrete foundation construction and a mat foundation construction method.

In the past, in concrete foundation construction for houses and other structures, a two-step pouring method was used in which concrete is poured in two separate steps, once for the base section and once for the slab section. In this method, supports have been proposed to prevent the formwork from tipping outward.

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

A formwork tilt prevention support has also been proposed that is made entirely from thin plates and includes a base that abuts against the side end face of the formwork, an outer locking portion that is integrated with the outer end of the base and locks into the outer corner of the formwork, an inner locking portion that is integrated with the inner end of the base and locks into the inner corner of the formwork, and an anchor portion that is integrated with the inner end of the base and is to be embedded in the foundation concrete (see, for example, Patent Document 2, etc.).

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 a formwork tilt prevention support device, and the slab foundation is formed without moisture leaking from the formwork or contamination caused by concrete (known as "slag", "thick concrete", etc.).

Utility Model Registration No. 3119713 JP 2008-297723 A

However, the formwork tilt prevention support device described in Patent Document 1 requires that the other end of the thin steel plate sandwiched between the flanges of the formwork be fastened by inserting a connector through the through hole and the connecting hole in the flange, which makes installation time-consuming.

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 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 concern that in such situations the formwork tilt prevention effect may be reduced.

The present invention was 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 can be easily attached to a formwork, easily adjusted in position, and reliably prevent tilting.

The formwork tilt prevention support device according to the present invention is a formwork tilt prevention support device made of a thin plate used to hold a formwork when forming a concrete foundation, and comprises a first base portion having a length corresponding to the front-to-rear thickness of the 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 between the first base portion and the vertical bar portion of the first formwork, a second base portion whose base ends are integrally connected to the first base portion and has a length corresponding to the front-to-rear thickness of the 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. When the first clip portion is sandwiched between the vertical battens of the first formwork, the second base and the second clip portion are embedded in concrete and function as anchors, and when the second clip portion is sandwiched between the vertical battens of the second formwork, the first base and the first clip portion are embedded in concrete and function as anchors.

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. This provides the effect of easily attaching to the formwork and easily adjusting the position, and of reliably preventing tilting. In addition, the formwork tilt prevention support can be used for two types of formwork simply by changing the orientation, and therefore there is no need to prepare formwork tilt prevention supports for different types of formwork.

The first and second clip parts are formed as leaf springs made by bending a portion of a thin, elongated rectangular plate that is integral with the first and second base parts.

With this configuration, the first and second clip parts are formed as leaf springs, so they are clamped by elastic deformation simply by being inserted into the vertical bars of the first and second formwork, respectively, making it extremely easy to attach them to the first and second formwork.

The first clip portion and the second clip portion protrude from opposite sides of the first and second base portions.

According to this configuration, the first clip portion and the second clip portion are provided protruding 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, so that the unused clip portion does not hinder the installation, and the installation to the formwork can be carried out smoothly.

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

This configuration has the effect of allowing the mounting height to be easily adjusted by hitting the first protruding piece from above with a hammer or the like while the first clip part is clamped to the vertical bar of the first formwork, or the second protruding piece while the second clip part is clamped to the vertical bar of the second formwork, thereby pushing down the formwork tilt prevention support.

In addition, the upper and lower ends near the boundary between the first base and the second base are provided with restricting pieces that protrude from the same surface as the first and second protruding pieces.

With this configuration, the upper and lower ends near the boundary between the first and second bases are provided with restricting pieces that protrude from the same surface as the first and second protruding pieces. When the formwork tilt prevention support is pushed down, the restricting pieces come into contact with the adjacent formwork to restrict rotation, and the formwork tilt prevention support can be pushed down without tilting.

The fold includes at least one of a notch or a groove formed at the boundary between the first base and the second base.

With this configuration, at least one of a notch or a recessed groove is formed at the boundary between the first base and the second base, which has the effect of making it easy to break off the boundary between the first base and the second base when dismantling the formwork.

The formwork anti-tip support of the present invention is a formwork anti-tip support made of a thin plate used to hold a formwork when forming a concrete foundation, and comprises a base having a length corresponding to the front-to-rear thickness of a side end of the formwork and abutting the surface of the side end, a clip portion formed integral with the base and clamped to the vertical bar of the formwork between the base and the clip portion, and an anchor portion integrated with the base end of the base and embedded in concrete when the clip portion is clamped to the vertical bar of the formwork , and the clip portion is formed as a leaf spring formed by cutting a part of the thin plate that is integral with the base at a right angle to one side and bending it parallel to the base, and bending it in a "V" shape when viewed from above with the tip side open .

With this configuration, when the clip portion is clamped between the base and the vertical bar of the formwork, the anchor portion 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 tipping.

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 slab foundation portion formed along the periphery of the base portion in concrete slab foundation construction, and includes a reinforcing bar arrangement process for arranging reinforcing bars on the slab concrete, an outer formwork installation process for erecting multiple outer formworks along the periphery of the site after the reinforcing bar arrangement process, a temporary fixing process for temporarily fixing the formwork tilt prevention supports on the outer formwork 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 tilt prevention support is pushed down to position at least a portion of the formwork within the concrete before the concrete hardens, an inner formwork installation step in which, after the positioning step and after the base concrete hardens, multiple inner formworks are erected facing each other on the inner periphery of the outer formwork, a slab foundation pouring step in which slab foundation concrete is poured between the outer formwork and the inner formwork to form the slab foundation portion after the inner formwork installation step, 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.

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 process, and after the temporary fixing process, the base concrete to form the base part is poured in the base pouring process, 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. In addition, after the base pouring process, before the base concrete hardens in the positioning process, the formwork tilt prevention support is pushed down to position and embed at least a part of it in the concrete, so that the outer formwork can be reliably prevented from tilting. This has the effect of being easy to attach to the formwork and easy to adjust the position, and reliably preventing tilting.

1 is a front view showing a formwork tilt prevention support device according to a first embodiment of the present invention. FIG. FIG. 2 is a rear view showing the formwork tilt prevention support device according to the first embodiment. FIG. 2 is a right side view showing the formwork tilt prevention support device according to the first embodiment. FIG. 2 is a left side view showing the formwork tilt prevention support device according to the first embodiment. FIG. 2 is a plan view showing the formwork tilt prevention support device according to the first embodiment. FIG. 2 is a bottom view showing the formwork tilt prevention support device according to the first embodiment. FIG. 2 is a perspective view showing a formwork tilt prevention support device according to the first embodiment. FIG. 2 is another perspective view showing the formwork tilt prevention support device according to the first embodiment. 1 is an oblique view showing a state in which a formwork tilt prevention support device according to the first embodiment is attached to a first formwork. FIG. FIG. 10 is an enlarged perspective view showing a portion viewed from the X-ray arrow in FIG. 9 . 10 is a cross-sectional view taken along line XI-XI in FIG. 9. 1 is an oblique view showing a state in which a formwork tilt prevention support device according to the first embodiment is attached to a second formwork. FIG. FIG. 13 is an enlarged perspective view showing a portion viewed from the arrow XIII in FIG. 12 . This is a cross-sectional view taken along line XIV-XIV in Figure 13. FIG. 11 is a cross-sectional view of a construction site showing a temporary fastening process. FIG. 11 is a cross-sectional view of a construction site showing the base pouring process. FIG. 11 is a cross-sectional view of a construction site showing a positioning process. This is a cross-sectional view of a construction site showing the inner formwork installation process. This is a cross-sectional view of a construction site showing the process of pouring a slab footing. This is a cross-sectional view of the construction site after the formwork dismantling process. FIG. 5 is a front view showing a formwork tilt prevention support device according to a second embodiment of the present invention. A rear view showing the formwork tilt prevention support device related to the second embodiment. A right side view showing the formwork tilt prevention support device related to the second embodiment. A left side view showing the formwork tilt prevention support device related to the second embodiment. A plan view showing a formwork tilt prevention support device related to the second embodiment. A bottom view showing the formwork tilt prevention support device related to the second embodiment. FIG. 11 is a perspective view showing a formwork tilt prevention support device according to a second embodiment. FIG. 11 is another perspective view showing the formwork tilt prevention support device according to the second embodiment. A cross-sectional view equivalent to Figure 11 showing a state in which a formwork tilt prevention support device according to the second embodiment is attached to a first formwork. A cross-sectional view equivalent to Figure 14 showing a state in which a formwork tilt prevention support device according to the second embodiment is attached to a second formwork.

Below, we will explain each embodiment of the formwork tilt prevention support device according to the present invention with reference to the drawings.

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.

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 concrete for the splay footing in a two-step pouring method in which concrete is poured twice for the base part and the splay footing in concrete foundation construction for a house or the like. A number 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 the first formwork 101 (see FIG. 9). The first formwork 101 has vertical rib parts 103 extending vertically 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 the second formwork 201 (see FIG. 12). The second formwork 201 has vertical rib parts 203 extending vertically at both left and right ends. The formwork tilt prevention support device 1 can be used for both the first formwork 101 and the second formwork 201.

The formwork tilt prevention support device 1 is made by processing a thin, rectangular steel plate, and as shown in FIG. 1, 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, and a cut-off portion 30.

The first base 11 is a flat plate-like portion that has a length corresponding to the front-to-rear thickness of the side end 102 of the first formwork 101 and is abutted against the surface of the side end 102.

The first clip portion 12 is provided integrally with the first base portion 11, and as shown in Figs. 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 the central portion of the first base portion 11 is cut out at a right angle toward one side into a rectangular shape and bent into a "V" shape in plan view with the tip side open.

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.

The second base 21 is a flat plate-like portion whose base end is integrally connected to the first base 11, has a length corresponding to the front-to-rear thickness of the side end 202 of the second formwork 201, and abuts against the surface of the side end 202.

The second clip portion 22 is provided integrally with the second base 21 and is clamped to the vertical bar portion 203 of the second formwork 201 between the second base 21 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 21 is cut out at a right angle toward the other side into a rectangular shape and bent into a "V" shape in plan view with the tip side open. 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 bases 11, 21.

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.

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 easier to separate the first and second base portions 11, 21 by slitting. The slit portion 30 has cutout portions 31, 31 and a groove 32. The cutout portion 31 is a V-shaped notch formed at the upper and lower ends 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.

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

In the construction method for a mat foundation in this embodiment, the ground on the site where the building will be constructed is first excavated to a specified size and depth and leveled, and then the 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 Figure 15).

Next, the reinforcing bar arrangement process is carried out. In the reinforcing bar arrangement process, reinforcing bars 3 are arranged horizontally and vertically in the basing concrete 52 via spacer blocks 54 (see Figure 15).

Next, the outer formwork installation process is performed. In the outer formwork installation process, the outer formwork SK is erected along the periphery of the site. Specifically, a plurality of outer formworks SK, the first formwork 101 or the second formwork 201, are continuously erected and held in the longitudinal direction on the ground via formwork supports 58 (see FIG. 15).

Next, a temporary fixing process is carried out to temporarily fix the formwork tipping prevention support 1 to the outer formwork SK. In the temporary fixing process, the formwork tipping prevention support 1 is temporarily fixed to the outer formwork SK above the planned height BL of the base top end. For example, when the first formwork 101 is used as the outer formwork SK, the formwork tipping prevention support 1 is placed in a horizontal position with the first base 11 and first clip portion 12 on the outside and the second base 21 and second clip portion 22 on the inside (i.e., facing above the concrete of the base B), and the first clip portion 12 is clamped to the vertical bar portion 103 of the first formwork 101 between the first base 11 and the first clip portion 12 (see Figures 9 to 11 and 15). On the other hand, when using the second formwork 201 as the outer formwork SK, the formwork tilt prevention support 1 is placed in a horizontal position with the second base 21 and second clip portion 22 facing outward and the first base 11 and first clip portion 12 facing inward, and the second clip portion 22 is clamped to the vertical bar portion 203 of the second formwork 201 between the second base 21 and the second clip portion 22 (see Figures 12 to 14 and 15).

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

Next, after the base casting process, before the base concrete hardens, a positioning process 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 so that more than half, preferably the entirety, from 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. 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 tilt prevention support 1 is positioned and embedded in the base concrete so that at least half of the lower end of the first base 11, first clip part 12, and first protruding piece 13, which protrude inward from the outer formwork SK, and preferably the entirety of the first base 11, first clip part 12, and first protruding piece 13 are embedded in the base concrete.

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

After the curing period of the slab concrete has passed 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 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 tilt 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 that protrudes outward from the base portion B is separated together with the second clip portion 22 and the second protruding piece 23, and excess protrusions are removed from the outer peripheral surface of the base portion B, resulting in a flat surface.

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 the side end 102 of the 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 the vertical bar portion 103 of the first formwork 101 between the first base 11, a second base 21 whose base ends are integrally connected to the first base 11, has a length corresponding to the front-to-rear thickness of the side end 202 of the second formwork 201 and abuts against the surface of the side end 202, and The second clip portion 22 is provided integrally with the first base 11 and is sandwiched between the second base 21 and the vertical slat portion 203 of the second formwork 201, and a slit portion 30 is formed at the boundary between the first base 11 and the second base 21 to separate the first and second bases 11 and 21 by folding and cutting. When the first clip portion 12 is sandwiched between the vertical slat portion 103 of the first formwork 101, the second base 21 and the second clip portion 22 are embedded in the concrete and function as anchors, and when the second clip portion 22 is sandwiched between the vertical slat portion 203 of the second formwork 201, the first base 11 and the first clip portion 12 are embedded in the concrete and function as anchors.

According to this configuration, when the first clip portion 12 is clamped to the vertical slat 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 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 slat 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 function as an anchor when buried in concrete in this state. Therefore, it is easy to attach to the formwork, easy to adjust the position, and has the effect of reliably preventing tilting. In addition, it can be used for two types of first formwork 101 and second formwork 201 simply by changing the direction in which the formwork tilt prevention support 1 is attached, so there is no need to prepare formwork tilt prevention supports according to the type of formwork.

The first and second clip parts 12, 22 are formed as leaf springs made by bending a portion of a thin, elongated rectangular plate that is integral with the first and second base parts 11, 21.

With this configuration, the first and second clip parts 12, 22 are formed as leaf springs, so that they are clamped by elastic deformation simply by being inserted into the vertical bar parts 103, 203 of the first and second formwork 101, 201, respectively, and have the effect of being extremely easy to attach to the first and second formwork 101, 201.

The first clip portion 12 and the second clip portion 22 protrude from opposite sides of both surfaces of the first and second base portions 11 and 21.

According to this configuration, the first clip portion 12 and the second clip portion 22 are provided on opposite sides of both surfaces of 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 located 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 located on the side that does not face the vertical bar portion 203, so that the unused clip portion does not hinder the installation, and the installation to the formwork can be carried out smoothly.

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.

This configuration has the effect of easily adjusting the installation height by pressing down the formwork tilt prevention support 1 or 2 with a hammer or the like from above on the first protruding piece 13 with the first clip part 12 clamped to the vertical bar part 103 of the first formwork 101, or the second protruding piece 23 with the second clip part 22 clamped to the vertical bar part 203 of the second formwork 201.

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 periphery of the base portion B in concrete slab foundation construction, and includes a reinforcing bar arrangement process for arranging reinforcing bars on the basin concrete 52, an outer formwork installation process for erecting multiple outer formworks SK along the periphery of the site after the reinforcing bar arrangement process, a temporary fixing process for temporarily fixing formwork tipping prevention supports 1 above the planned height BL of the top end of the base portion of the outer formwork SK, a base pouring process for pouring base concrete to form the base portion B after the temporary fixing process, and a step for performing the step of ... Then, before the base concrete hardens, there is a positioning step in which the formwork tilt prevention support 1 is pushed down to position at least a portion of it in the concrete; after the positioning step and after the base concrete hardens, there is an inner formwork installation step in which multiple inner formworks UK are erected facing each other on the inner periphery of the outer formwork SK; after the inner formwork installation step, there is a slab foundation pouring step in which slab foundation concrete is poured to form a slab foundation portion N between the outer formwork SK and the inner formwork UK; and after the slab foundation concrete poured in the slab foundation pouring step hardens, there is a formwork dismantling step in which the outer formwork SK and the inner formwork UK are dismantled.

According to this method, the formwork tilt prevention support 1 is temporarily fixed above the planned height BL of the top end of the base part of the outer formwork SK in the temporary fixing process, and after the temporary fixing process, the base concrete to form the base part B is poured in the base pouring process, which has the effect of preventing the formwork tilt 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 process, before the base concrete hardens in the positioning process, the formwork tilt prevention support 1 is pushed down to position and embed at least a portion of it in the concrete, which has the effect of reliably preventing the outer formwork SK from tilting in the slab pouring process.

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.

The formwork tilt prevention support 2 is made by processing a thin, rectangular steel plate, and as shown in FIG. 21, etc., is composed of a first base 11, a first clip portion 12, a first protruding piece 13, a second base 21, a second clip portion 22, a second protruding piece 23, a cut portion 30, and a restricting piece 33.

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 and 21, but in this embodiment, the second clip portion 22 is cut and raised to protrude from the same side as the first clip portion 12. In addition, the first protruding piece 13 and the second protruding piece 23 are protruding from the opposite side of the first clip portion 12 and the second clip portion 22 relative to the first base portion 11 and the second base portion 21.

In the first embodiment, the boundary between the first base 11 and the second base 21 is only one location, and is always the same whether it is attached to the first formwork 101 or the second formwork 201. In contrast, in this embodiment, the boundary between the first base 11 and the second base 21 is provided at two locations: a line connecting the upper and lower cutouts 31a, 31a, and a line connecting the upper and lower cutouts 31b, 31b. In this embodiment, when it 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 it 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.

In this embodiment, the upper and lower ends near the boundary between the first base 11 and the second base 21 are further provided with restricting pieces 33, 33 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 cutouts 31a, 31b on the upper end side and between the cutouts 31a, 31b on the lower end side.

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 restricting pieces 33, 33 protruding from the same surface as the first and second protruding pieces 13, 23. Therefore, when the formwork tilt prevention support 1 is pushed down, the restricting pieces 33, 33 come into contact with the adjacent formwork to restrict rotation, and the formwork tilt prevention support 2 can be pushed down while maintaining a substantially horizontal position without tilting.

<Modification>
The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention. For example, in each of the above-described embodiments, the configuration of the formwork tilt prevention support that can be used for 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 the formwork tilt prevention support exclusively for the first formwork 101.

That is, the formwork tilt prevention support of this modified example 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 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 provided 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 integrated with the base end of the first base 11 and embedded in concrete when the first clip portion 12 is clamped to the vertical bar portion 103 of the first formwork 101.

According to this configuration, when the first clip portion 12 is clamped to the vertical bar portion 103 of the first formwork 101 between the first base portion 11 and 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, easy to adjust the position, and has the effect of reliably preventing tipping.

In addition, instead of the above-mentioned modified example, in the formwork tilt prevention support device 1 according to the first embodiment, the first clip portion 12 and the first protruding piece 13 can be omitted to form a configuration exclusively for the second formwork 201.

In addition, in the second embodiment, the rectangular regulating pieces 33, 33 are formed by bending horizontally at the upper and lower ends near the boundary between the first base 11 and the second base 21, but the regulating pieces 33, 33 may be formed by protruding vertically and bending them so as to be 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 tilt prevention support 2 is pressed down in the positioning process, so that the position can be adjusted more smoothly.

<Additional Notes>
Each embodiment shown in the drawings of this application includes a design that may be the subject of a design registration 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".

1. Formwork tilt prevention support (first embodiment)
2. Formwork tilt prevention support (second embodiment)
11 First base portion 12 First clip portion 13 First protruding piece 21 Second base portion 22 Second clip portion 23 Second protruding piece 30 Folded portion 31 Cutout portion (first embodiment)
31a Cutout portion (second embodiment)
31b Cutout portion (second embodiment)
32 Groove 33 Regulating piece 52 Concrete to be laid 101 First formwork 102 Side end 103 Vertical rib portion 201 Second formwork 202 Side end 203 Vertical rib portion B Base portion BL Planned height of top end of base portion N Spread footing portion SK Outer formwork UK Inner formwork

Claims (8)

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. The formwork tilt prevention support device according to claim 1, wherein the first and second clip parts are formed as leaf springs made by bending a portion of a thin, elongated rectangular plate that is integral with the first and second base parts. The formwork tilt prevention support device according to claim 2, wherein the first clip portion and the second clip portion are provided protruding from opposite sides of the first and second base portions. 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. The formwork tilt prevention support device according to claim 4, which is provided with a restricting piece protruding from the upper and lower ends near the boundary between the first base and the second base on the same side as the first and second protruding pieces. The formwork tilt prevention support device according to any one of claims 1 to 5, 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. 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 . 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.

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