Formwork fixing member and foundation construction method using the same

Abstract

The present invention provides a formwork fixing member and a foundation construction method using the same, which eliminates the need to fix the formwork for the base section by driving in rod-shaped members. [Solution] The formwork fixing member 1 fixes the formwork 52 that creates the base portion 51 of the strip foundation 5. The formwork fixing member 1 includes a locking portion 11 that restricts the movement of the formwork fixing member 1 toward the widthwise edge of the base portion 51 by being locked to a foundation reinforcing bar holder 7 for holding the foundation reinforcing bars (bottom reinforcing bars 6) that are placed when creating the base portion 51, a ground contact portion 12 that extends from the locking portion 11 toward the widthwise edge of the base portion 51, and a formwork support portion 13 that rises from the widthwise edge of the ground contact portion 12 to support the formwork 52.

Description

Technical Field

[0001] This invention relates to a formwork fixing member for fixing a formwork for fabricating a base base portion and a foundation construction method using the same.

Background Art

[0002] Patent Document 1 discloses a reinforcing bar holder for a foundation, which includes two support members and a cross-member horizontally mounted between the two support members with both ends supported by the two support members. The two support members include a base having a sufficient grounding area, a support member main body erected from the base, a protruding portion provided protruding from the support member main body in a direction in which the cross-member is to be horizontally mounted and having a contact surface allowing contact of the tip portion of the cross-member, and an elastic deformable tongue piece portion provided protruding from the support member main body with its tip disposed near the protruding portion and contacting the upper surface of the cross-member when the tip portion of the cross-member contacts the contact surface.

[0003] Further, Patent Document 2 discloses a reinforcing bar assembly support mechanism including a reinforcing bar support main body at the center, bar arrangement spacers disposed on both sides of the reinforcing bar support main body, and a connecting member connecting the reinforcing bar support main body and the bar arrangement spacers and capable of being housed in the reinforcing bar support main body, wherein the connecting member adjusts the distance between the reinforcing bar support main body and the bar arrangement spacers to enable length adjustment.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, even if the foundation rebar holder described in Patent Document 1 is used, the formwork is not supported by this foundation rebar holder. Therefore, it is necessary to take measures to prevent the formwork from tipping outward, such as driving rod-shaped members into the ground at the outer surface of the formwork. If the structure includes base cross bars positioned perpendicular to the bottom rebars which are foundation rebars, it is possible to attach spacers to these base cross bars and fix the formwork to these spacers. On the other hand, in structures where the base cross bars are not provided, the work of driving rod-shaped members, etc., as described above, becomes necessary.

[0006] Driving rod-shaped members into the ground presents a significant physical burden on workers. Furthermore, if the ground surface is made of lean concrete, driving in the rod-shaped members becomes difficult, or at least the process becomes even more challenging.

[0007] On the other hand, the rebar support device described in Patent Document 2 has the above-mentioned spacer for rebar placement, so it is thought that even in structures where the above-mentioned horizontal base reinforcement is not placed, the work of driving rod-shaped members into the ground to fix the formwork can be eliminated. However, since the rebar support device described in Patent Document 2 has a structure in which the above-mentioned spacer for rebar placement is integrally provided in the rebar support device, it cannot meet the demand to eliminate the work of driving rod-shaped members into the ground to fix the formwork in structures where the above-mentioned horizontal base reinforcement is not placed, while continuing to use, for example, the foundation rebar holder described in Patent Document 1.

[0008] In view of the above circumstances, this invention aims to provide a formwork fixing member and a foundation construction method using the same that eliminate the need for fixing the formwork for the base portion by driving in rod-shaped members or the like. [Means for solving the problem]

[0009] The formwork fixing member according to this invention is a formwork fixing member for fixing formwork for creating the base portion of a foundation, and is characterized by comprising: a locking portion that restricts the movement of the formwork fixing member by locking with a foundation reinforcing bar holder for holding the foundation reinforcing bars that are arranged in the creation of the base portion; a grounding portion that extends from the locking portion to the widthwise edge side of the base portion; and a formwork support portion that rises from the widthwise edge side of the base portion at the grounding portion to support the formwork.

[0010] With the formwork fixing member having the above configuration, the locking portion restricts the movement of the formwork fixing member, and in this restricted movement state, the formwork is supported by the formwork support portion, thus eliminating the need to drive in rod-shaped members or the like to prevent the formwork from falling outwards. Furthermore, since the formwork fixing member can be provided separately from the foundation rebar holder, it can meet the demand for eliminating the need to drive rod-shaped members into the ground to fix the formwork in a structure where base cross reinforcement is not installed, while continuing to use the foundation rebar holder, etc.

[0011] The formwork support portion may support the outer or inner surface of the formwork. This makes it relatively easy to support the formwork with respect to the formwork support portion.

[0012] The locking portion may be locked to the tip of the leg portion of the foundation rebar holder. Since the leg portion of the foundation rebar holder is extended in the width direction of the base portion, the formwork fixing member can be locked to the foundation rebar holder without significantly increasing the length of the ground contact portion.

[0013] A thin plate-like rib extending in the direction of extension of the base is formed on the tip side of the leg portion of the above-mentioned foundation rebar holder, and the locking portion may have a receiving portion that can accommodate the edge portion of the thin plate-like rib by the lateral sliding of the formwork fixing member, an upper locking portion located above the edge portion of the thin plate-like rib, and a lower locking portion located below the edge portion of the thin plate-like rib. With this, the formwork fixing member can be locked to the tip side of the leg portion of the foundation rebar holder by a relatively simple lateral sliding operation.

[0014] The thin plate-shaped ribs of the above-mentioned foundation reinforcement holder are inclined upward from the widthwise edge side to the widthwise center side of the base portion, and the locking portion may have an inclined rising portion that rises along the inclination of the thin plate-shaped ribs.

[0015] In the above-described formwork fixing member, the locking portion, the grounding portion, and the formwork support portion may be formed by bending a single plate. This makes it easier to reduce the manufacturing cost of the formwork fixing member.

[0016] Furthermore, the foundation construction method according to this invention is characterized by including the steps of: placing the foundation reinforcing bar holder on the ground side where the foundation will be made; arranging the lower reinforcing bars as foundation reinforcing bars at the base portion of the foundation using the foundation reinforcing bar holder; locking the locking portion of the formwork fixing member to the foundation reinforcing bar holder and setting the ground portion on the ground side to set the formwork fixing member; attaching the formwork to the formwork support portion of the formwork fixing member; and pouring ready-mixed concrete, which will be the base portion of the foundation, into the formwork.

[0017] This method eliminates the need to drive in rod-shaped members to prevent the formwork from tipping over when constructing the base structure of a foundation without horizontal reinforcement bars. [Effects of the Invention]

[0018] This invention has the advantage of eliminating the need to drive in rod-shaped members to prevent the formwork used to create the base of the foundation from tipping over on the outside.

Brief Description of the Drawings

[0019] [Figure 1] It is an explanatory drawing showing the formwork fixing member and the foundation construction method of the embodiment. [Figure 2] It is an explanatory drawing showing the locking relationship between the formwork fixing member and the foundation reinforcing bar holder of the embodiment in perspective. [Figure 3] It is a drawing showing the formwork fixing member of the embodiment, where (A) of the drawing is a front view and (B) of the drawing is a perspective view. [Figure 4] It is an explanatory drawing showing the positional relationship between the formwork fixing member, the formwork, and the foundation reinforcing bar holder of the embodiment.

Modes for Carrying Out the Invention

[0020] Hereinafter, embodiments of this invention will be described based on the accompanying drawings. As shown in FIG. 1, the formwork fixing member 1 is for fixing a formwork 52 for fabricating a base portion 51 of a cloth foundation 5 as a foundation, and is used by being locked to a foundation reinforcing bar holder 7 that can hold a lower end bar 6 or the like embedded inside the base portion 51. Note that the formwork fixing member 1 can also be used when the above foundation is a paste foundation with jaws and the above foundation reinforcing bar holder 7 is used.

[0021] 基础用鉄筋保持具7は、例えば、図2にも示すように、二つの支持部材71,72と、これら支持部材71,72同士を互いに連結する一つの横架部材73とを備える。支持部材71,72は、樹脂等からなり、互いに同じ構造とすることができる。また、支持部材71,72は、所定の高さを有しており、下部側には脚部71a,72aを備える。脚部71a,72aの下面側は、支持部材71,72が自立できるように、十分な接地面積を有する平面状に形成されている。

[0022] The content in Japanese about the foundation reinforcing bar holder 7 is translated as follows: The foundation reinforcing bar holder 7 includes, for example, as also shown in FIG. 2, two support members 71, 72 and one cross-member 73 that connects these support members 71, 72 to each other. The support members 71, 72 are made of resin or the like and can have the same structure as each other. Further, the support members 71, 72 have a predetermined height and include legs 71a, 72a on the lower side. The lower surface side of the legs 71a, 72a is formed in a planar shape having a sufficient ground contact area so that the support members 71, 72 can stand independently.On the ground (such as on lean concrete) where the base portion 51 is constructed, multiple foundation rebar holders 7 are arranged at predetermined intervals along the extension direction X of the base portion 51, and the two support members 71 and 72 of each foundation rebar holder 7 are aligned in the width direction Y perpendicular to the extension direction X. The lower reinforcing bars 6, etc., are held in place by the multiple foundation rebar holders 7 arranged in this manner. The formwork fixing members 1 are attached to each of the two support members 71 and 72.

[0023] As shown in Figures 3(A) and 3(B), the formwork fixing member 1 includes a locking portion 11, a ground contact portion 12, and a formwork support portion 13.

[0024] The locking portion 11 locks onto the foundation rebar holder 7, thereby restricting the movement of the formwork fixing member 1 toward the widthwise edge (Y-direction edge) of the base portion 51. In this embodiment, the locking portion 11 is locked onto the tip side of the legs 71a, 72a of the foundation rebar holder 7, which are the widthwise edge. For example, thin plate-like ribs 71b, 72b are formed on the tip side of the legs 71a, 72a, sloping upward from the widthwise edge of the base portion 51 toward the widthwise center and extending in the extension direction X of the base portion 51, and the locking portion 11 is locked onto these thin plate-like ribs 71b, 72b.

[0025] The locking portion 11 has an obliquely rising portion 111 at the upper end of the tip surface portion that is bent in the X direction on the tip side of the ground contact portion 12, which slopes upward from the widthwise edge side of the base portion 51 toward the widthwise center side along the inclination of the thin plate-like ribs 71b and 72b.

[0026] A receiving portion 11a is formed on the central side of the locking portion 11 to accommodate the edges of the thin plate-like ribs 71b and 72b by the lateral sliding of the formwork fixing member 1 in the X direction. The locking portion 11 is located in the same plane as the inclined rising portion 111 and has an upper locking portion 11b located on the upper surface side of the thin plate-like ribs 71b and 72b, and a lower locking portion 11c that extends downward from the tip side of the upper locking portion 11b, intersecting the rising direction of the inclined rising portion 111, and wraps around to the underside of the edges of the thin plate-like ribs 71b and 72b.

[0027] The ground contact portion 12 extends from the locking portion 11 to the widthwise edge of the base portion 51 and has a horizontal surface portion 12a that contacts the ground (such as lean concrete) and a rib portion 12b that rises perpendicular to the horizontal surface portion 12a.

[0028] The formwork support portion 13 rises from the widthwise edge of the base portion 51 in the grounding portion 12 and supports the formwork 52. In this embodiment, the formwork support portion 13 has a receiving portion 13a that receives the outer surface of the formwork 52. This receiving portion 13a is located in the plane where the rib portion 12b of the grounding portion 12 is located, and receives the outer surface of the formwork 52 by an edge portion facing the foundation reinforcement holder 7. The formwork support portion 13 also has a rib portion 13b that is bent perpendicular to the receiving portion 13a. The plane where the rib portion 12b of the grounding portion 12 and the receiving portion 13a of the formwork support portion 13 are located is perpendicular to the extension direction X of the base portion 51.

[0029] Furthermore, in this embodiment, as an example, as shown in Figure 4, the formwork 52 has a folded plate-like wave shape, and the receiving portion 13a has an uneven shape corresponding to the folded plate-like wave shape. Note that the shape of the receiving portion 13a may vary depending on whether the formwork 52 is a wooden frame or a lath frame, etc. The length of the grounding portion 12 is set so that the receiving portion 13a rises up at a predetermined location where the formwork 52 should be positioned. In addition, an engaging recess 13c is formed on the upper side of the receiving portion 13a for the upper part of the formwork 52 to engage with, and an engaging recess 13d is formed on the lower side of the receiving portion 13a for the lower part of the formwork 52 to engage with. Note that the rib portion 13b of the formwork support portion 13 can become the part to which the formwork is attached in place of the receiving portion 13a in specifications where the formwork is not supported by the receiving portion 13a. In the configuration in which the formwork is attached in place of the receiving portion 13a, the round through portion formed on the formwork support portion 13 can be used for fastening the formwork. Furthermore, the lower end of the rib portion 13b of the formwork support portion 13 is in contact with the ground side and contributes to stabilizing the posture of the formwork fixing member 1.

[0030] Furthermore, in the formwork fixing member 1 of this embodiment, a single plate is bent to form a locking portion 11, a ground contact portion 12, and a formwork support portion 13.

[0031] With the formwork fixing member 1 configured as described above, the locking portion 11 restricts the movement of the formwork fixing member 1, and in this restricted movement state, the formwork 52 is supported by the formwork support portion 13, thus eliminating the need to drive rod-shaped members or the like into the ground to prevent the formwork 52 from falling outwards. Furthermore, since the formwork fixing member 1 can be provided separately from the foundation rebar holder 7, etc., it can meet the demand for eliminating the need to drive rod-shaped members into the ground to fix the formwork 52 in a base structure where base horizontal reinforcement is not provided, while continuing to use the foundation rebar holder 7, etc.

[0032] If the formwork support portion 13 is configured to support the outer surface of the formwork 52, supporting the formwork 52 becomes relatively easy. Furthermore, if engaging recesses 13c and 13d are formed, the formwork 52 can be easily attached to the formwork support portion 13.

[0033] Since the tips of the legs 71a and 72a of the foundation rebar holder 7 are formed to be longer in the width direction of the base portion 51, if the locking portion 11 is configured to lock onto the tips of the legs 71a and 72a of the foundation rebar holder 7, the formwork fixing member 1 can be locked to the foundation rebar holder 7 without making the length of the ground contact portion 12 too long.

[0034] If the leg portions 71a and 72a of the foundation rebar holder 7 have thin plate-like ribs 71b and 72b that extend in the extension direction X of the base portion 51, and the locking portion 11 of the formwork fixing member 1 has a housing portion 11a, an upper locking portion 11b, and a lower locking portion 11c, then the formwork fixing member 1 can be locked to the leg portions 71a and 72a of the foundation rebar holder 7 by a relatively simple lateral sliding operation.

[0035] If a single sheet of metal is bent to form the locking portion 11, the ground contact portion 12, and the formwork support portion 13, it becomes easier to reduce the manufacturing cost of the formwork fixing member 1.

[0036] The following describes a foundation construction method using the formwork fixing member 1. In this foundation construction method, as shown in Figures 1 and 2, the foundation rebar holders 7 are placed on the ground (on lean concrete, etc.) where the strip foundation 5 will be extended. Note that the foundation rebar holders 7 are not limited to those shown. Also, the locking portion 11 of the formwork fixing member 1 is not limited to the hook shape shown, but may have a locking shape that matches the shape of the leg portion of the foundation rebar holder used.

[0037] Next, the foundation reinforcing bars (bottom reinforcing bars 6) are placed in the area that will become the base portion 51 of the strip foundation 5 using the foundation reinforcing bar holders 7 that have been positioned. Then, as an example, the locking portion 11 of the formwork fixing member 1 is locked to the thin plate-shaped ribs 71b and 72b at the tip of the legs 71a and 72a of the foundation reinforcing bar holders 7, and the ground contact portion 12 is placed on the ground to set the formwork fixing member 1.

[0038] Next, the formwork 52 is attached to the formwork fixing member 1. This attachment is done, for example, by having the formwork support part 13 support the outer surface of the formwork 52. Then, ready-mixed concrete, which will become the base part 51 of the strip foundation 5, is poured into the formwork 52 that has been attached in this manner.

[0039] With this method, even in the structure of the base section 51 where no horizontal reinforcement bars are placed, the work of driving in rod-shaped members to prevent the formwork 52 from tipping over outwards becomes unnecessary.

[0040] Although embodiments of this invention have been described above with reference to the drawings, this invention is not limited to the illustrated embodiments. Various modifications and variations can be made to the illustrated embodiments within the same scope as this invention, or within the equivalent scope. [Explanation of Symbols]

[0041] 1: Formwork fixing member 5: Strip foundation 6: Lower end reinforcement 7: Reinforcing bar holder for foundation 11: Locking part 11a: Containment section 11b: Upper locking part 11c: Lower locking part 12: Grounding part 12a:Horizontal part 12b: Rib section 13: Formwork support section 13a: Receiving part 13b: Rib section 13c: Engaging recess 13d: Engaging recess 51: Base section 52: Formwork 71: Support member for foundation rebar holder 71a: Legs 71b: Thin plate-like ribs 72: Support member for foundation rebar holder 72a: Legs 72b: Thin plate-like ribs 73: Horizontal members 111: Diagonal upper part

Claims

1. A formwork fixing member for fixing formwork for creating the base portion of a foundation, comprising: a locking portion that restricts the movement of the formwork fixing member by engaging with a foundation reinforcing bar holder for holding the foundation reinforcing bars arranged in the creation of the base portion; a grounding portion that extends from the locking portion to the widthwise edge side of the base portion; and a formwork support portion that rises from the widthwise edge side of the base portion at the grounding portion to support the formwork.

2. A formwork fixing member according to claim 1, wherein the formwork support portion is characterized in that it receives the outer surface or inner surface of the formwork.

3. The formwork fixing member according to claim 1, characterized in that the locking portion is locked to the tip side of the leg portion of the foundation reinforcing bar holder.

4. The formwork fixing member according to claim 3, wherein a thin plate-shaped rib extending in the direction of extension of the base portion is formed on the tip side of the leg portion of the foundation reinforcing bar holder, and the locking portion has a receiving portion that can accommodate the edge portion of the thin plate-shaped rib by the lateral sliding of the formwork fixing member, an upper locking portion located above the edge portion of the thin plate-shaped rib and a lower locking portion located below the edge portion of the thin plate-shaped rib.

5. The formwork fixing member according to claim 4, wherein the thin plate-shaped rib of the foundation reinforcing bar holder is inclined upward from the widthwise edge side of the base portion toward the widthwise center side, and the locking portion has an inclined rising portion that rises along the inclination of the thin plate-shaped rib.

6. A formwork fixing member according to claim 1, characterized in that the locking portion, the ground contact portion, and the formwork support portion are formed by bending a single plate.

7. A foundation construction method using a formwork fixing member according to any one of claims 1 to 6, comprising the steps of: placing the foundation reinforcing bar holder on the ground side where the foundation will be constructed; arranging the lower reinforcing bars as foundation reinforcing bars at the base portion of the foundation using the foundation reinforcing bar holder; locking the locking portion of the formwork fixing member to the foundation reinforcing bar holder and setting the ground-contacting portion to the ground side to set the formwork fixing member; attaching the formwork to the formwork support portion of the formwork fixing member; and pouring ready-mixed concrete that will form the base portion of the foundation into the formwork.

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