JP2023122753A - Formwork support member and formwork set - Google Patents

Abstract

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

Description

TECHNICAL FIELD The present invention relates to a formwork support member and a formwork set that hold an outer formwork and an inner formwork, which form a raised portion of a foundation, facing each other by pouring concrete between them. More particularly, the present invention relates to a formwork support member and a formwork set suitable for a method of constructing a pressure-resistant board portion of a mat foundation and a rising portion on the outer peripheral side by placing concrete once.

In the construction method that constructs the pressure plate part of the mat foundation and the rising part on the outer peripheral side by placing concrete in one time, the inner formwork placed on the inner side of the rising part is thrown away and the state is floating from the upper surface of the base such as concrete. should be placed in For this reason, conventionally, fixtures are used to support the lower surface of the inner formwork. The fixture is rod-shaped and has a formwork standing portion at its tip. After the base end is inserted through a hole provided in the outer formwork, a nut is screwed to the insertion end. As a result, it extends horizontally from the inner surface of the outer formwork. Therefore, by arranging the inner formwork on the erected part of the formwork, it becomes possible to arrange it in a state of floating from the pressure-resistant board part (see, for example, Patent Document 1).

Japanese Patent Application Laid-Open No. 2021-31981

By the way, in the device described in Patent Document 1, since the fixtures are inserted through the holes provided in the outer formwork, when removing the outer formwork after the cast concrete has hardened, the fixing fixtures extend in the direction of The outer surface formwork must be moved along, which is not necessarily preferable in terms of workability. That is, after the concrete has hardened, the surface of the concrete and the external formwork are in a state of being fixed, so the work of moving the external formwork along the extending direction of the fixture, that is, the concrete In order to move the outer formwork parallel to the surface of the outer surface, a large force is required to peel off the entire fixing surface at once, which is a factor that complicates the work. Moreover, since the fixture protrudes from the rising portion after removing the external formwork, it is necessary to remove the fixture, which further complicates the work for forming the rising portion of the foundation.

SUMMARY OF THE INVENTION In view of the above circumstances, an object of the present invention is to provide a form support member and a form set that can facilitate the work of constructing the rising portion of a foundation.

In order to achieve the above object, the formwork support member according to the present invention is provided by placing concrete between the outer formwork and the inner formwork, which constitute the upright portion of the foundation, facing each other. a formwork supporting member for holding, a supporting part main body provided with a connecting part at one end and a formwork receiving part at the other end for supporting the lower surface of the inner formwork; and the outer formwork By detachably connecting to the connecting portion by penetrating the outer surface formwork from the outer surface side of the outer surface formwork in a state where the connecting portion is in contact with the inner surface of the It is characterized by comprising a fixing member that sandwiches the outer surface formwork and supports the support main body in a cantilever manner on the outer surface formwork.

According to the present invention, when the connection state between the fixing member and the connecting portion is released, there is no member protruding from the outer peripheral surface of the hardened concrete. Therefore, it is not necessary to cut off the main body of the supporting portion after removing the external formwork. Moreover, since there is no restriction on the direction of movement when removing the external formwork, for example, by tilting the lower edge of the external formwork as a fulcrum, the upper edge can be pulled away from the concrete first, eliminating the need for a large force. , it is advantageous in terms of workability when removing the external formwork.

1 shows a formwork set that is an embodiment of the present invention, (a) is a view of a single external formwork viewed from the outer surface side, (b) is a view of an assembled state viewed from the outer peripheral side, (c ) is a longitudinal sectional view of (b). FIG. 2 is a plan view of the essential parts of the formwork set shown in FIG. 1 in an assembled state; FIG. 2 is an enlarged longitudinal sectional view of the formwork set shown in FIG. 1; FIG. 2 is an enlarged view of a main part of the formwork set shown in FIG. 1, showing a connected state of the outer formwork, viewed from the outer surface side; FIG. 2 is a vertical cross-sectional view schematically showing a slab foundation to be constructed by the formwork set shown in FIG. 1 ; Fig. 1 shows a formwork support member applied to the formwork set shown in Fig. 1, (a) is a partially cutaway plan view, (b) is a side view, and (c) is a view in the direction of arrow C in (b). be. FIG. 1 shows the state after the concrete placed in the formwork set shown in FIG. ) is a vertical cross-sectional view of the external formwork separated from the concrete.

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of a formwork support member and a formwork set according to the present invention will be described in detail below with reference to the accompanying drawings.
1 to 4 show a formwork set that is an embodiment of the present invention. The formwork set exemplified here constitutes the foundation 2 of a building H such as a detached house, as shown in FIG. , 2C is suitable for constructing the slab foundation 2 by placing concrete once. As shown in FIGS. 1 to 4, this formwork set includes an inner formwork 10, an outer formwork 20, a formwork support member 30, an upper end reinforcing member 40, a lower rail member 50, and a width stop member 60. .

The inner formwork 10 and the outer formwork 20 are plate-shaped with flat inner surfaces 10a and 20a, respectively, and concrete is placed between them while the inner surfaces 10a and 20a face each other. be. The inner formwork 10 forms an inner surface 2Ba that protrudes upward from the upper surface of the pressure-resistant board portion 2A at the rising portion 2B provided on the outer peripheral side of the mat foundation 2. As shown in FIG. In the present embodiment, the inner mold 10 is a rectangular plate made of metal such as steel.

The outer surface formwork 20 is for constituting the outer surface 2Bb that protrudes upward from the upper surface of the base 1 at the rising portion 2B provided on the outer peripheral side, and is above and below the inner surface formwork 10 by the plate thickness of the pressure-resistant board portion 2A. It has a horizontally long rectangular shape with a large dimension along the line. In this embodiment, the outer formwork 20 is configured by including a panel 21 having a flat plate shape and a frame member 22 attached to the outer surface of the panel 21 . The panel 21 is a thin plate made of non-metal such as plywood. Although not shown in the figure, the inner surface 20a of the panel 21 is provided with a resin film or coated with a release material in order to improve releasability from the hardened concrete.

The frame member 22 is formed in the shape of a hollow rectangular cylinder by extruding a metal such as an aluminum alloy, and is attached to the outer surface of the panel 21 along the upper edge, lower edge and both side edges. In addition, it is attached along the top and bottom at a portion that is approximately in the middle of the length. That is, on the outer surface of the panel 21, vertical frame members (hereinafter referred to as vertical frame members 22a for distinction) are attached to both sides and the intermediate portion at substantially equal intervals.

Of these, two vertical frame members 22a adjacent to each other on the left and right sides, in the illustrated example, are supported by the vertical frame member 22a provided on the right edge as viewed from the outer surface of the panel 21 and the vertical frame member 22a provided on the center. Screw insertion holes 23 for connection are provided, and connecting screw insertion holes 24 are provided in the vertical frame members 22a provided on both edges. The support screw insertion holes 23 are formed perpendicular to the surface of the panel 21 in the lower portion of the vertical frame member 22a and penetrate the vertical frame member 22a and the panel 21, and are provided at a plurality of positions with different heights. is provided in These support screw insertion holes 23 are for inserting fixing screw members 32 of the mold support member 30, which will be described later. The connection screw insertion holes 24 are formed so as to penetrate substantially horizontally along the surface of the panel 21 at the upper end and lower end of the vertical frame member 22a. The connecting screw insertion holes 24 are for connecting the outer molds 20 to each other by passing the connecting screw members S through the outer molds 20 arranged side by side.

A frame member provided along the upper edge of the panel 21 (hereinafter referred to as an upper frame member 22b for distinction) is attached in a state of being close to the upper edge of the panel 21. As shown in FIG. On the other hand, the frame member provided along the lower edge (hereinafter referred to as the lower frame member 22c when distinguished) is attached with an insertion space 22d between the lower edge of the panel 21 and the lower surface thereof. is provided with a rail linking member 25. The rail linking member 25 is attached to the lower frame member 22c so as to be rotatable about its vertical axis, and can be detachably engaged with a lower rail member 50, which will be described later. In the illustrated example, rail connecting members 25 are provided one by one in the substantially central portion of the external formwork 20 .

The formwork support member 30 holds the inner formwork 10 and the outer formwork 20 facing each other, and as shown in FIG. The support portion main body 31 has a rod-like shape having a connecting male screw portion 31a at one end and an adjusting male screw portion 31b at the other end. While the member 31c is provided, the male threaded portion 31b for adjustment is provided with the form receiving portion 31d.

The cone member 31c is molded from resin and has a truncated cone shape with a tapered outer peripheral surface. A female threaded portion 31e into which the male threaded portion 31a for connection of the support portion main body 31 can be screwed is provided at the central portion of the cone member 31c so as to pass through both end faces. For example, the female threaded portion 31e is provided on the inner peripheral surface of the cylindrical member embedded in the central portion of the cone member 31c. A connecting male screw portion 31a is detachably screwed into the female screw portion 31e from the end of the cone member 31c having a small diameter. The formwork receiving portion 31d is for supporting the lower surface of the inner formwork 10 described above. It is sandwiched between nut members 31f and 31g screwed together. An outer receiving surface 31h that abuts on the outer surface of the inner mold 10 and an inner receiving surface 31i that abuts on the inner surface 10a of the inner mold 10 protrude upward from the tip of the formwork receiving portion 31d. It is set up as That is, if the lower edge of the inner formwork 10 is accommodated between the outer receiving surface 31h and the inner receiving surface 31i, the inner formwork 10 can be arranged on the upper surface of the formwork receiving portion 31d. Become. The position of the formwork receiving portion 31d can be appropriately changed by adjusting the screwing positions of the two nut members 31f and 31g with respect to the adjusting male screw portion 31b.

The fixing screw member 32 has a screw shaft portion 32a that can be screwed into the female screw portion 31e of the cone member 31c, and a screw head portion 32b that is larger in diameter than the screw shaft portion 32a. The length of the screw shaft portion 32a is set so that it protrudes from the inner surface 20a of the panel 21 when it is inserted into the supporting screw insertion hole 23 of the external formwork 20 .

The upper end reinforcing member 40 is arranged at the upper end portion of the external formwork 20 via a holding metal fitting 41, and, like the frame member 22, is formed in a rectangular tubular shape made of metal such as an aluminum alloy. The illustrated upper end reinforcing member 40 has a cross section larger than that of the frame member 22 and is formed to have a length larger than the entire length along the left and right sides of the outer surface formwork 20, and is provided along the upper edge of the panel 21. In addition, it is possible to arrange them along the upper frame member 22b and across a plurality of laterally adjacent outer surface molds 20. As shown in FIG.

The lower rail member 50 has an insertion groove 52 at one end of a mounting plate portion 51, and can be mounted on the upper surface of the base 1 via the mounting plate portion 51 with the insertion groove 52 opening upward. be. The insertion groove 52 is for holding the external formwork 20 in an upright state with the lower edge of the panel 21 inserted. An engaging piece 53 is provided on the lower rail member 50 . The engaging piece 53 engages with the rail linking member 25 when the rail linking member 25 is rotated with the lower edge of the panel 21 inserted into the insertion groove 52 , and the outer formwork 20 is positioned against the lower rail member 50 . It restricts upward movement. In this embodiment, the engaging piece 53 is formed on the lower rail member 50 by bending the upper edge portion of the side plate 52a adjacent to the mounting plate portion 51 in the two side plates 52a and 52b forming the insertion groove 52. be. The width stopper member 60 is hung between the upper ends of the inner formwork 10 and the outer formwork 20 to prevent the mutual distance between these forms 10 and 20 from changing.

When constructing the mat foundation 2 by applying the formwork set configured as described above, after appropriately arranging reinforcement 70 on the upper surface of the base 1, the outer surface of the rising portion 2B on the outer peripheral side on the upper surface of the base 1 The outer formwork 20 is placed through the lower rail member 50 in the portion corresponding to 2Bb. More specifically, after fixing the lower rail member 50 to the upper surface of the base 1 via the mounting plate portion 51, the lower end portion of the panel 21 is inserted into the insertion groove 52 of the lower rail member 50, and the rail linking member is inserted. 25 engages between the lower rail member 50 and the lower frame member 22c of the external formwork 20. As shown in FIG. In this state, the rail linking member 25 is engaged with the lower rail member 50 to prevent upward movement of the outer formwork 20 with respect to the base 1 .

The formwork support members 30 may be attached in advance to the outer surface formwork 20 to be arranged on the lower rail member 50 , or the formwork support members 30 may be attached after being arranged on the lower rail member 50 . In order to attach the formwork support member 30 to the external formwork 20, the cone member 31c is brought into contact with the portion of the inner surface 20a of the panel 21 facing the support screw insertion hole 23, and from this state, the vertical frame member 22a is supported. The fixing screw member 32 may be screwed into the female screw portion 31e of the cone member 31c through the support screw insertion hole 23 and the support screw insertion hole 23 of the panel 21 . That is, when the fixing screw member 32 is screwed into the cone member 31c, the outer formwork 20 is secured via the vertical frame member 22a between the end surface of the cone member 31c and the screw head 32b of the fixing screw member 32. The panel 21 can be clamped, and as a result, the support body 31 of the formwork support member 30 is cantilevered so as to protrude substantially horizontally from the inner surface 20a of the panel 21 . The support screw insertion hole 23 may be appropriately selected according to the projection dimension of the rising portion 2B from the pressure plate portion 2A.

The left and right external formworks 20 arranged on the lower rail member 50 are connected to each other by passing the connecting screw members S through the connecting screw insertion holes 24 of the adjacent vertical frame members 22a. The connection between them is reinforced by disposing an upper end reinforcing member 40 so as to span over a holding metal fitting 41 provided at the upper end of each of them. Further, in the illustrated example, by engaging the other end of the support member 80, one end of which is fixed to the base 1 or the ground, with the connection screw member S that connects the upper portions of the vertical frame members 22a, , the outer formwork 20 is prevented from falling to the outer peripheral side. A corner member 90 is provided at the protruding corner of the rising portion 2B so that the external formwork 20 is connected to each other.

If the inner formwork 10 is placed on the formwork receiving portion 31d of the formwork support member 30 from the above state, the inner formwork 10 can be arranged in a state facing the outer formwork 20 in a state of floating from the base 1. becomes possible. After that, the width stopper member 60 is interposed between the upper end portion of the outer surface formwork 20 and the upper end portion of the inner surface formwork 10, and from this state, the inner surface 20a of the outer surface formwork 20 and the inner surface 10a of the inner surface formwork 10 are separated. By placing concrete between them, the pressure-resistant board portion 2A of the mat foundation 2 and the rising portion 2B on the outer peripheral side can be formed by placing concrete once.

At this time, according to the above-described formwork set, the outer surface formwork 20 is configured by providing the frame member 22 on the outer surface of the panel 21, and the formwork support member 30 sandwiches the panel 21 and the frame member 22. Therefore, even when concrete is placed, the external formwork 20 and the formwork support member 30 are prevented from being relatively inclined, and the raft foundation 2 can be constructed with high accuracy. It becomes possible.

After the concrete has hardened, the width stopper member 60, the connection screw member S, and the upper end reinforcing member 40 are removed, and then the outer surface formwork 20 and the lower rail member 50 are removed. . Here, in the formwork set described above, when the fixing screw member 32 is removed from the cone member 31c, there is no member protruding from the outer surface 2Bb of the concrete. Therefore, when removing the external formwork 20, the direction of movement is not restricted. For example, as shown in FIG. It can be pulled apart, which is advantageous in terms of workability when removing the external formwork 20 . Moreover, after removing the external formwork 20, after removing the cone member 31c, by filling the portion where the cone member 31c was present with the covering member, the external surface 2Bb of the rising portion 2B and the connecting male screw portion 31a can be It becomes possible to secure a large dimension d up to one end face of the . As a result, even when the connecting male threaded portion 31a of the supporting portion main body 31 is made of metal such as steel, there is no risk of direct contact with external water such as rainwater or permeation, and corrosion such as rust is eliminated. situation can be prevented. In addition, since the inner formwork 10 is not exposed to the outside of the building H and is made of metal such as steel, it is left as it is on the inner surface of the rising portion 2B. is also possible.

In the above-described embodiment, the outer surface formwork is exemplified by attaching a frame member to the outer surface of the panel, but the outer surface formwork may be configured by only the panel. Moreover, although the cone member 31c having the female threaded portion 31e is illustrated as the connecting portion of the form support member, and the fixing screw member 32 is illustrated as the fixing member, the present invention is not limited to this. Furthermore, although a rectangular plate formed of metal such as steel is exemplified as the inner mold 10, a heat insulating material made of resin or a wooden plywood (so-called concrete panel) may be applied.

As described above, the formwork support member according to the present invention holds the outer formwork and the inner formwork, which form the rising portion of the foundation, facing each other by pouring concrete between them. a formwork supporting member, a supporting part main body provided with a connecting part at one end and a formwork receiving part at the other end for supporting the lower surface of the inner formwork; By detachably connecting the outer surface formwork to the connection portion by penetrating the outer surface formwork from the outer surface side of the outer surface formwork in a state where the connection portion is in contact with the surface, the outer surface mold is detachably connected to the connection portion. It is characterized by comprising a fixing member that clamps the frame and supports the support main body in a cantilever manner on the outer formwork.
According to this invention, when the connection state between the fixing member and the connecting portion is released, there is no member protruding from the outer peripheral surface of the hardened concrete. Therefore, it is not necessary to cut off the main body of the supporting portion after removing the external formwork. In addition, since there is no restriction on the direction of movement when removing the outer formwork, for example, by tilting the lower edge of the outer formwork as a fulcrum, the upper edge can be pulled away from the concrete first, eliminating the need for a large force. , it is advantageous in terms of workability when removing the external formwork.

Further, according to the present invention, in the form support member described above, the connecting portion has a female thread portion, and the fixing member is a screw shaft detachably screwed into the female thread portion of the connecting portion. and a fixing screw member having a screw head with a diameter larger than that of the screw shaft, and the outer formwork is sandwiched between the screw head and the connecting portion. and
According to this invention, by screwing the fixing screw member into the female threaded portion of the connecting portion, the supporting body portion can be connected to the floor fitting screw member. can be facilitated.

Further, according to the present invention, in the formwork support member described above, the support main body is provided with a male threaded portion for connection at one end, and the connection portion has a tapered outer peripheral surface and the It is a cone member formed in a state in which a female screw portion penetrates, the male screw portion for connection is screwed to one end of the female screw portion, and the fixing screw member is the other end portion of the female screw portion. It is characterized by being screwed together.
According to this invention, after the cone member is removed from the hardened concrete, if the portion where the cone member was present is filled with the covering member, a large area from the outer peripheral surface of the rising portion to one end of the connecting male screw portion can be obtained. It becomes possible to secure the dimensions. Therefore, there is no possibility that external water such as rainwater comes into direct contact with the main body of the supporting portion, or that the main body of the supporting portion comes into contact with the main body through permeation, and corrosion such as rust can be prevented.

Further, according to the present invention, in the formwork support member described above, the support main body is provided with an adjustment male screw portion at the other end portion, and between two nut members screwed to the adjustment male screw portion. It is characterized in that the formwork receiving portion is sandwiched.
According to this invention, it is possible to adjust the position of the formwork receiver.

A formwork set according to the present invention is characterized by comprising an outer formwork and an inner formwork between which concrete is placed, and the above-described support member for formwork.
According to this invention, when the connection state between the fixing member and the connecting portion is released, there is no member protruding from the outer peripheral surface of the hardened concrete. Therefore, it is not necessary to cut off the main body of the supporting portion after removing the external formwork. Moreover, since there is no restriction on the direction of movement when removing the external formwork, for example, by tilting the lower edge of the external formwork as a fulcrum, the upper edge can be pulled away from the concrete first, eliminating the need for a large force. , it is advantageous in terms of workability when removing the external formwork.

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

Claims (5)

A formwork support member that holds an outer formwork and an inner formwork that constitute the rising portion of a foundation in a state of facing each other by placing concrete between them,
a supporting part main body provided with a connecting part at one end and with a formwork receiving part at the other end for supporting the lower surface of the inner formwork;
With the connecting portion in contact with the inner surface of the outer surface formwork, the outer surface formwork is penetrated from the outer surface side of the outer surface formwork and detachably connected to the connection portion, thereby and a fixing member that sandwiches the outer surface formwork between and supports the main body of the support portion in a cantilever manner on the outer surface formwork. The connecting portion has a female screw portion,
The fixing member has a screw shaft portion that is detachably screwed into the female screw portion of the connecting portion, and is configured by a fixing screw member having a screw head with a larger diameter than the screw shaft portion, The formwork support member according to claim 1, wherein the outer formwork is sandwiched between the screw head and the connecting portion. A male threaded portion for connection is provided at one end of the support portion main body,
The connecting portion is a cone member which has a tapered outer peripheral surface and is formed in a state in which the female screw portion penetrates through a central portion thereof, and the male screw portion for connection is screwed to one end of the female screw portion. combined,
The form support member according to claim 2, wherein the fixing screw member is screwed to the other end of the female screw portion. The support portion main body is provided with an adjusting male screw portion at the other end,
2. The formwork support member according to claim 1, wherein the formwork receiving portion is sandwiched between two nut members screwed onto the adjusting male screw portion. A formwork set comprising an outer formwork and an inner formwork between which concrete is poured, and the formwork support member according to any one of claims 1 to 4. .

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