JP7460447B2 - Staircase formwork - Google Patents

Description

The present invention relates to stair formwork.

Traditionally, in the construction of foundations for buildings (particularly industrialized housing), steel formwork that can withstand repeated use has been used. On the other hand, in the construction of concrete floors with stairs such as entrance porches, wooden formwork made of plywood, rafters, etc. is generally used (see, for example, Patent Documents 1 and 2). In the construction of concrete stairs, the formwork for the risers needs to be installed in a state where it is raised above the ground surface. In this case, if the formwork for the stairs is made of wood, the formwork for the risers raised above the ground surface can be easily fixed to other formworks with fasteners such as nails, so that the formwork for the risers can be easily installed at the desired height.

Japanese Patent Application Publication No. 11-125007 JP2012-026096A

Wooden formwork is more susceptible to deterioration than steel formwork. Furthermore, wooden formwork with deteriorated concrete adhering to it is difficult to recycle. For this reason, wooden formwork must be discarded after one or a few uses, which leads to an increase in industrial waste. In contrast, steel formwork can be reused, but it is difficult to fasten it to other formwork with fasteners such as nails, making it difficult to install it at the desired height as a formwork for risers.

The present invention aims to provide a staircase formwork that can be installed at a desired height without fastening the kickstand formwork (kickstand formwork) to other formwork with fasteners, and that can be reused.

In order to achieve the above object, the stair formwork according to the present invention includes a riser form provided along the riser of the staircase, and a riser form provided on both sides of the riser form in the stair form used for constructing concrete stairs. and a riser form support part that supports the riser formwork, and the riser form support part has a height position on a side installation body that is installed or temporarily installed on the side of the stairs. Adjustably supported, at either approximately the same height as the lower end of the riser corresponding to the riser supported by the lower end of the riser form support, or at a height above the lower end of the riser. The riser formwork supporting part is opened on the side where the supported riser formwork is arranged, and has a recessed part into which a side end of the riser formwork is inserted. do.

In the present invention, the kick-in formwork support part is supported by a side installation body that is installed or temporarily installed on the side of the stairs, so that the kick-in formwork support part can be supported by the foundation of the building located on the side of the stairs or a formwork that is temporarily installed on the side of the stairs. Since the kick-in formwork is supported by the kick-in formwork support part that is supported by the side installation body, there is no need to fix the kick-in formwork to the side installation body with a fastener such as a nail. And since the height position of the kick-in formwork support part is adjustable, the kick-in formwork can be installed at a desired height. Furthermore, since the lower end of the kick-in formwork support part is installed so that it is located at either approximately the same height as the lower end of the kicker or at a height above the lower end of the kicker, the kick-in formwork support part and the kick-in formwork are not buried in concrete. This makes it possible to reuse the kick-in formwork support part and the kick-in formwork.

In addition, in the staircase formwork of the present invention, a lower support portion is provided at the lower end of the concave portion , and the side end portion of the riser formwork may be inserted into the concave portion and placed on the lower support portion.
With this configuration, the riser form can be easily installed on the riser form support part without using fasteners such as nails.

In addition, in the staircase formwork of the present invention, the kick-in formwork support part has the concave part and the lower support part, and has a support part main body that supports the kick-in formwork, a fixing part fixed to the support part main body, and an attachment part that attaches the fixing part to the side installation body , and the attachment part may be configured to attach the fixing part to the side installation body so that the fixing part is positioned away from the side installation body .
With this configuration, when the fixing portion and the side installation body are fixed to each other, a space can be secured between the fixing portion and the side installation body for installing a fixing member or the like for fixing them to each other.

In addition, in the staircase formwork of the present invention, the fixing part comprises a first fixing part connected to the front side on one side in the fore-and-aft direction on which the steps of the staircase are arranged in the support body, which is the side on which the lower step is located, and a second fixing part connected to the rear side on the other side in the fore-and-aft direction on the support body, which is the side on which the upper step is located, and the lower end of the first fixing part may be located above the lower end of the riser formed by the riser formwork supported by the support body.
With this configuration, the first fixing portion is not embedded in the concrete of the lower (front) step, and the riser formwork support portion can be easily removed after the concrete of the staircase has hardened.

In addition, in the staircase formwork of the present invention, the fixing part comprises a first fixing part connected to the front side on one side in the fore-and-aft direction on which the steps of the staircase are arranged in the support body, which is the side on which the lower step is located, and a second fixing part connected to the rear side on the other side in the fore-and-aft direction on the support body, which is the side on which the upper step is located, and the lower end of the second fixing part may be located above the upper end of the riser formed by the riser formwork supported by the support body.
With this configuration, the second fixing portion is not embedded in the concrete, and the riser formwork support portion can be easily removed after the concrete of the stairs has hardened.

In addition, the staircase formwork of the present invention may have a first spacing retaining portion that maintains the spacing between adjacent riser formwork support portions in the front-to-rear direction in which the steps of the staircase are arranged at a predetermined dimension.
With this configuration, the spacing between the kick-in formwork support parts, i.e., the spacing between the kick-in formwork, can be easily controlled, improving workability and construction quality.

In addition, in the staircase formwork of the present invention, the first spacing retaining portion may have a first claw portion inserted into one of the kick-in formwork support portions adjacent to each other in the fore-and-aft direction from a direction intersecting the fore-and-aft direction, and a second claw portion inserted into the other of the kick-in formwork support portions from a direction intersecting the fore-and-aft direction.
With this configuration, even if a force acts so as to cause adjacent kick-in formwork support parts to move relatively in the fore-and-aft direction, the fore-and-aft distance between adjacent kick-in formwork support parts can be maintained constant.

In addition, the staircase formwork of the present invention may have a second spacing retaining portion that maintains the spacing between adjacent riser formworks in the front-to-rear direction in which the steps of the staircase are arranged at a predetermined dimension.
With this configuration, the spacing between the riser formwork can be easily controlled, improving workability and construction quality.

In addition, in the stepped formwork of the present invention, the second spacing retaining portion has a retaining portion protruding piece that protrudes downwardly from the rear end portion on the side where the upper step in the fore-and-aft direction is located, and the retaining portion protruding piece may be placed on a formwork protruding piece that protrudes forward from the lower end of the rear riser formwork.
With this configuration, the retaining portion protruding piece can be prevented from being embedded in concrete, and the second spacing portion can be installed in a stable state.

In addition, in the stepped formwork of the present invention, the upper end of the kicker formwork may be located above the upper end of the kicker, and the second spacing retaining portion may have a clamping portion that clamps the upper end of the front kicker formwork, which is the side on which the lower step in the fore-and-aft direction is located, from the fore-and-aft direction.
With this configuration, the clamping portion can be prevented from being embedded in concrete, and the second spacing portion can be installed in a stable state.

According to the present invention, the riser formwork can be installed at a desired height without being fixed to a side installation body such as another formwork with a fixture, and can be reused.

FIG. 1 is a perspective view showing an example of a stair frame according to an embodiment of the present invention. FIG. 1 is a perspective view showing an example of a staircase according to an embodiment of the present invention. FIG. 2 is another perspective view showing an example of a staircase formwork according to an embodiment of the present invention. (a) is a front view of the riser formwork support part, (b) is a side view of the riser formwork support part, and (c) is a plan view of the riser formwork support part. It is a perspective view which shows the riser formwork support part supported by the foundation. It is a perspective view which shows the riser formwork support part supported by the side formwork. 1A is a front view of the pressing member, FIG. 1B is a plan view of the pressing member, and FIG. (a) is a front view of the support portion spacing retaining portion, (b) is a plan view of the support portion spacing retaining portion, (c) is a side view of the support portion spacing retaining portion, and (d) is a plan view of the support portion spacing retaining portion in a contracted state. (a) is a front view of the formwork spacing holding part, (b) is a plan view of the formwork spacing holding part, (c) is a side view of the formwork spacing holding part, and (d) is the formwork in a reduced state. It is a top view of a space|interval holding part. FIG. 13 is a perspective view showing a form spacing retaining part attached to a riser formwork. It is a perspective view showing a construction method of stairs. FIG. 12 is a perspective view showing a method of constructing stairs following FIG. 11;

Below, a staircase formwork 1 according to an embodiment of the present invention will be described with reference to Figures 1 to 12. The staircase formwork 1 according to this embodiment shown in Figure 1 is used, for example, when constructing a staircase 2 for an external entrance porch of a building as shown in Figure 2. In the following description, the horizontal direction perpendicular to the width direction of the staircase 2 (the direction of arrow X in the drawing) is referred to as the front-to-rear direction (the direction of arrow Y in the drawing). In the front-to-rear direction, the side where the lower step 21 is arranged relative to the upper step 21 is referred to as the front side, and the side where the upper step 21 is arranged relative to the lower step 21 is referred to as the rear side. For long members, the direction in which the member extends may be referred to as the length direction.

The stairs 2 in this embodiment are provided with one side in the width direction in contact with the foundation 11 of the building. The stairs 2 and the foundation 11 are constructed separately. The side surface 12 of the foundation 11 (hereinafter referred to as the foundation side surface 12) is a vertical surface facing the width direction. In this embodiment, the stairs 2 are provided with a finishing portion on the surface of the concrete portion constructed with the staircase formwork 1. Therefore, the concrete portion of the stairs 2 constructed with the staircase formwork 1 does not have a step nose, and a step nose is provided as a finishing portion. Therefore, the upper end of the riser 22 is continuous with the front end of the tread 23 of the upper step 21.

As shown in FIGS. 1 and 3, the stair formwork 1 includes a plurality of side formworks 3 arranged along the other side of the staircase 2 in the width direction, and a plurality of side formworks 3 arranged on the rear side of the staircase 2. a plurality of rear formworks 4, a plurality of riser formworks 5 disposed along the surface of the risers 22 of the stairs 2, a plurality of riser formwork supports 6 that respectively support the riser formworks 5, and A support part spacing holding part 7 (first spacing holding part) that maintains a constant interval between riser formwork supports 6 adjacent to each other, and a formwork spacing holding part that maintains a constant spacing between riser formworks 5 adjacent to each other in the front-rear direction. 8 (second spacing holding section). The stair formwork 1 of this embodiment is a steel formwork.

The riser formwork support part 6 includes a riser formwork support part 6A supported by the building foundation 11 (side installed body) located on one side of the staircase 2 in the width direction, and a riser formwork support part 6A supported on the other side of the staircase 2 in the width direction. It is comprised of a riser formwork support part 6B supported by the temporarily installed side formwork 3 (side installation body). The riser formwork support part 6A and the riser formwork support part 6B have the same shape, are installed in different directions, and are installed symmetrically in the width direction. The support part spacing holding part 7 includes a support part spacing holding part 7A attached to the riser formwork support part 6A, and a support part spacing holding part 7B attached to the riser formwork support part 6B. The support part spacing holding part 7A and the support part spacing holding part 7B have the same shape, are installed in different directions, and are installed symmetrically in the width direction. Below, the details of the riser formwork support part 6A supported by the foundation 11 of the building and the support part spacing holding part 7 attached to the riser formwork support part 6A supported by the building foundation 11 will be explained. Descriptions of the riser formwork support part B supported by the frame 3 and the support part interval holding part 7B attached to the riser formwork support part 6B supported by the side formwork 3 will be omitted.

The plurality of side forms 3 are each formed into a plate shape, are parallel to the base side surface 12, and are arranged in the front-rear direction at intervals from the base side surface 12. The plurality of rear formworks 4 are each formed into a plate shape and arranged in the width direction in a direction perpendicular to the base side surface 12. One widthwise end of the arranged rear formworks 4 is in contact with the foundation 11, and the other widthwise end thereof is connected to the side formwork 3. The side formwork 3 and the rear formwork 4 are connected via a corner formwork 41 that forms a corner. The side formwork 3 and the rear formwork 4 are supported on the ground 13 by support members 42, respectively.

As shown in FIG. 1, the riser formwork 5 includes a riser forming plate part 51, a formwork upper plate part 52, a formwork lower plate part 53, a first formwork side plate part 54, and a second formwork side plate. 55 and reinforcing ribs 56. In the following description, it is assumed that the riser formwork 5 is placed in front of the riser 22 as a formwork.

The kick-in forming plate portion 51 is a flat steel plate with the plate surface facing the front-rear direction. The rear surface of the kick-in forming plate portion 51 forms the surface of the kick-in 22. The upper formwork plate portion 52 protrudes forward from the entire upper edge of the kick-in forming plate portion 51. The front end of the upper formwork plate portion 52 is provided with a protruding piece 57 extending downward. The lower formwork plate portion 53 protrudes forward from the entire lower edge of the kick-in forming plate portion 51. The first formwork side plate portion 54 protrudes forward from an edge on one side in the width direction of the kick-in forming plate portion 51. The second formwork side plate portion 55 protrudes forward from an edge on the other side in the width direction of the kick-in forming plate portion 51. The reinforcing rib 56 protrudes forward from the middle part in the width direction of the kick-in forming plate portion 51. The protruding dimension from the riser forming plate portion 51 of each of the upper form plate portion 52, the lower form plate portion 53, the first form side plate portion 54, and the second form side plate portion 55 is set to the same value. The protruding dimension from the riser forming plate portion 51 of the reinforcing rib 56 is set to be equal to or less than the protruding dimension from the riser forming plate portion 51 of the upper form plate portion 52, the lower form plate portion 53, the first form side plate portion 54, and the second form side plate portion 55. The upper end of the reinforcing rib 56 is connected to the upper form plate portion 52, and the lower end of the reinforcing rib 56 is connected to the lower form plate portion 53.

Only one riser formwork 5 may be provided for each riser 22 of one step 21 (see FIG. 2), or a plurality of riser forms 5 may be arranged in the width direction for each riser 22 of one step 21. may be provided. When a plurality of riser forms 5 are arranged in the width direction, adjacent riser forms 5 are connected to each other. The height dimension of the riser formwork 5 is set larger than the height dimension of the riser 22. The riser formwork 5 is installed so that its lower end is at the height of the lower end 22a of the riser 22, that is, the height of the tread 23 of the lower step 21. Therefore, the upper side of the riser formwork 5 is arranged above the upper end of the riser 22, that is, above the tread surface 23 of the upper step 21.

As shown in FIGS. 4 to 6, the riser formwork support portion 6 includes a main body portion 61 and a mounting portion 62. As shown in FIGS. As shown in FIG. 4, the main body portion 61 has a main body groove portion 63 (concave portion) into which the riser formwork 5 (see FIG. 1) is attached. The attachment part 62 is connected to the main body part 61 and supported by the foundation 11 of the building or the side formwork 3. The mounting portion 62 is supported by the building foundation 11 or the side formwork 3 by being placed on or fixed to the building foundation 11 or the side formwork 3 located on the side of the stairs 2.

The main body 61 is a long member with a hat-shaped cross section formed by processing a steel plate such as a thin steel plate, and is arranged in a vertical direction. The main body groove 63 extends vertically and opens to one side in the width direction. The main body 61 has a main body outer plate 611, a first main body side plate 612, a second main body side plate 613, a main body lower plate 614 (lower support portion), a first main body flange plate 615, and a second main body flange plate 616. The main body outer plate 611, the first main body side plate 612, the second main body side plate 613, and the main body lower plate 614 (lower support portion) of the main body 61 constitute the support body 64 that supports the riser formwork 5, and the first main body flange plate 615 and the second main body flange plate 616 constitute the fixing portion 65 for fixing the riser formwork support portion 6 to the foundation 11 of the building or the side formwork 3.

The main body outer plate portion 611 is formed in a flat plate shape with a long rectangular plate surface. The main body outer plate portion 611 is arranged so that the plate surface faces the width direction. The first main body side plate portion 612 and the second main body side plate portion 613 are formed in the same shape. The first main body side plate portion 612 and the second main body side plate portion 613 are formed in a flat plate shape with a long rectangular plate surface. The length dimension (vertical dimension) of the first main body side plate portion 612 and the second main body side plate portion 613 is the same value as the length dimension of the main body outer plate portion 611. The first main body side plate portion 612 protrudes from the front edge portion of the main body outer plate portion 611 to the other side in the width direction. The second main body side plate portion 613 protrudes from the rear edge portion of the main body outer plate portion 611 to the other side in the width direction. The hollow space surrounded by the main body outer plate 611, the first main body side plate 612, and the second main body side plate 613 constitutes the main body groove 63. The main body lower plate 614 is formed in a flat plate shape and is provided at the lower end of the main body groove 63 with the plate surface oriented in a horizontal plane. The edge of the main body lower plate 614 is connected to the lower edge of each of the main body outer plate 611, the first main body side plate 612, and the second main body side plate 613.

The side ends of the kick-in formwork 5 are inserted into the main body groove 63. The groove width of the main body groove 63 is approximately the same as the thickness dimension (front-to-back dimension) of the kick-in formwork 5. The kick-in formwork 5 is installed with both side ends in the width direction inserted into the main body groove 63 and placed on the main body lower plate 614. The main body groove 63 is formed longer than the height dimension of the kick-in formwork 5.

The first main body flange plate portion 615 is formed in a flat plate shape with a plate surface having an elongated rectangular shape. The first main body flange plate portion 615 is formed to have a smaller longitudinal dimension than the main body outer plate portion 611, the first main body side plate portion 612, and the second main body side plate portion 613. The first main body flange plate 615 protrudes forward from the tip (edge on the other side in the width direction) of the first main body side plate 612 . The upper end of the first main body flange plate 615 is located at the same height as the upper end of the first main body side plate 612. The lower end portion of the first main body flange plate portion 615 is located above the lower end portion of the first main body side plate portion 612. That is, the lower end portion of the first main body flange plate portion 615 is arranged above the main body lower plate portion 614.

The second body flange plate portion 616 is formed in a flat plate shape with a plate surface that is a long rectangle. The lengthwise dimension (vertical direction) of the second body flange plate portion 616 is smaller than the lengthwise dimension of the first body flange plate portion 615, and the front-rear dimension is set to the same value as the front-rear dimension of the first body flange plate portion 615. The second body flange plate portion 616 protrudes rearward from the tip portion (the edge portion on the other side in the width direction) of the second body side plate portion 613. The upper end portion of the second body flange plate portion 616 is located at the same height as the upper end portion of the second body side plate portion 613. The lower end portion of the second body flange plate portion 616 is located above the lower end portion of the second body side plate portion 613. In other words, the lower end portion of the second body flange plate portion 616 is located above the main body lower plate portion 614. The lower end of the second body flange portion 616 is located above the height (tread height) of the upper end of the riser 22 formed by the riser formwork 5 supported by the riser formwork support portion 6.

The first body flange portion 615 is formed with a first slit 661 and a second slit 662 that extend vertically and penetrate the plate surface. The first slit 661 and the second slit 662 are arranged at intervals in the front-rear direction, and the first slit 661 is arranged forward of the second slit 662. The first slit 661 and the second slit 662 are formed in the first body flange portion 615 with two slits spaced apart in the vertical direction. The second body flange portion 616 is formed with a third slit 663 and a fourth slit 664 that extend vertically and penetrate the plate surface. The third slit 663 and the fourth slit 664 are arranged at intervals in the front-rear direction, and the third slit 663 is arranged rearward of the fourth slit 664. The third slit 663 and the fourth slit 664 are formed in three slits spaced apart in the vertical direction in the second body flange portion 616.

The mounting portion 62 has a main body connection portion 621 connected to the main body portion 61, and a side installation body support portion 622 supported by the foundation 11 or side formwork 3 of the building. The main body connection portion 621 has a hat-shaped cross section and is arranged in a direction extending in the vertical direction. The main body connection portion 621 has a connection outer plate portion 623, a first connection side plate portion 624, a second connection side plate portion 625, a first connection flange plate portion 626, and a second connection flange plate portion 627. The connection outer plate portion 623 is formed in a flat plate shape with a plate surface that is a long rectangle. The connection outer plate portion 623 is arranged in a direction in which the plate surface faces the width direction. The first connection side plate portion 624 and the second connection side plate portion 625 are formed in the same shape. The first connection side plate portion 624 and the second connection side plate portion 625 are formed in a flat plate shape with a plate surface that is a long rectangle. The first connection side plate 624 protrudes from the front edge of the connection outer plate 623 to the other side in the width direction. The second connection side plate 625 protrudes from the rear edge of the connection outer plate 623 to the other side in the width direction.

The first connection side plate part 624, the second connection side plate part 625, the first connection collar plate part 626, and the second connection collar plate part 627 have the same length dimension (vertical dimension). The connecting outer plate part 623 is longer than the first connecting side plate part 624, the second connecting side plate part 625, the first connecting collar plate part 626, and the second connecting collar plate part 627. The first connection side plate 624, the second connection side plate 625, the first connection flange plate 626, and the second connection flange plate 627 have their upper ends located at the same height, and the first connection side plate 624 is located at the same height. It protrudes lower than other plate parts. A connection groove portion 628 is formed in the main body connection portion 621 and surrounded by a connection outer plate portion 623, a first connection side plate portion 624, and a second connection side plate portion 625. The connection groove portion 628 is set to a size in which the main body outer plate portion 611, the first main body side plate portion 612, and the second main body side plate portion 613 of the main body portion 61 can be fitted.

The first connecting collar plate part 626 and the second connecting collar plate part 627 are formed in the same shape. The first connection flange plate part 626 and the second connection flange plate part 627 are formed in a flat plate shape with a long rectangular plate surface. The first connecting flange plate 626 projects forward from the tip (edge on the other side in the width direction) of the first connecting side plate 624 . The second connection flange plate 627 projects rearward from the tip (edge on the other side in the width direction) of the second connection side plate 625. A cylindrical first connecting female screw portion 626a that protrudes from the edge of a hole penetrating the plate surface to one side in the width direction is connected to the first connecting collar plate portion 626. A cylindrical second connecting female threaded portion 627a that protrudes from the edge of a hole penetrating the plate surface to one side in the width direction is connected to the second connecting collar plate portion 627. In the mounting portion 62 of this embodiment, two first female connection threaded portions 626a and two second female connection threaded portions 627a are provided at intervals in the vertical direction.

The side installation body support part 622 is formed in a flat plate shape, and is oriented from the lower edge of the main body connecting part 621 to one side in the width direction (from the main body connecting part 621 to the first connecting side plate part 624, The second connection side plate portion 625 protrudes to the side opposite to the side from which it protrudes. The side installation support part 622 is placed on the upper surface of the building foundation 11 or the upper surface of the side formwork 3.

The mounting portion 62 has a vertical dimension smaller than that of the main body portion 61 . The attachment portion 62 is disposed overlapping one side of the upper portion of the main body portion 61 in the width direction. The main body outer plate part 611 , the first main body side plate part 612 , and the second main body side plate part 613 of the main body part 61 are fitted into the main body groove part 63 . The connecting outer plate part 623 is arranged to overlap one side of the main body outer plate part 611 in the width direction. The first connection side plate part 624 is arranged to overlap the front side of the first main body side plate part 612. The second connection side plate portion 625 is arranged to overlap the rear side of the second main body side plate portion 613. The first connecting flange plate 626 is arranged to overlap one side of the first main body flange plate 615 in the width direction. The second connection flange plate 627 is arranged to overlap one side of the second main body flange plate 616 in the width direction. The side installation body support part 622 protrudes to one side in the width direction, that is, to the side away from the main body part 61.

When the mounting portion 62 and the main body portion 61 overlap as described above, the first slit 661 at the top of the first connecting flange portion 626 and the first connecting female thread portion 626a of the first connecting flange portion 626 are arranged to overlap, and the third slit 663 at the top of the second main body flange portion 616 and the second connecting female thread portion 627a of the second connecting flange portion 627 are arranged to overlap. The mounting portion 62 and the main body portion 61 can be fixed by fastening the screw 671 inserted into the first slit 661 from the other side in the width direction to the first connecting female thread portion 626a and fastening the screw 672 inserted into the third slit 663 from the other side in the width direction to the second connecting female thread portion 627a.

The height at which the main body part 61 and the mounting part 62 are fixed to each other can be adjusted within the vertical length range of the first slit 661 and the third slit 663 when the screws 671 and 672 are not fastened. It is configured. When adjusting the height of the main body part 61 and the mounting part 62, the upper surface of the main body lower plate part 614 of the main body part 61 becomes the height of the lower end of the riser formwork 5, and the height of the side installation body support part 622 of the mounting part 62 is adjusted. Adjustment is made so that the lower surface is at the height of the upper surface of the building foundation 11 or the upper surface of the side formwork 3. After adjusting the heights of the main body part 61 and the attachment part 62, the screws 671 and 672 are fastened.

As shown in FIG. 5, when the side installation body support part 622 is attached to the foundation 11 of the building, the lower surface of the side installation body support part 622 is pressed against the foundation 11 from above by the pressing member 9 with the lower surface in contact with the upper surface of the foundation 11 of the building. As shown in FIG. 5 and FIG. 7, the pressing member 9 is a member having an L-shaped cross section, and has a first pressing plate part 91 which is one side of the L shape, and a second pressing plate part 92 which is the other side. The first pressing plate part 91 and the second pressing plate part 92 are each formed in a long flat plate shape. The pressing member 9 may be formed by bending a steel plate into an L shape. The first pressing plate part 91 is formed with a first pressing plate slit 93 extending in the length direction. The second pressing plate part 92 is formed with a second pressing plate slit 94 extending in the length direction. The dimension from the corner part 95 of the pressing member 9 to the first pressing plate slit 93 is different from the dimension from the corner part 95 of the pressing member 9 to the second pressing plate slit 94.

The pressing member 9 is placed so that either the first pressing plate portion 91 or the second pressing plate portion 92 overlaps the side installation body support portion 622 placed on the upper surface of the foundation 11. As shown in FIG. 5, if the first pressing plate portion 91 is placed overlapping the side installation body support portion 622, the anchor bolt 111 of the foundation 11 is inserted into the first pressing plate slit 93 of the first pressing plate portion 91, and a nut is fastened to the anchor bolt 111. As a result, the position of the pressing member 9 is fixed, and the side installation body support portion 622 is sandwiched between the first pressing plate portion 91 and the upper surface of the foundation 11, and the kick-in formwork support portion 6 is fixed to the foundation 11. Depending on the position of the anchor bolt 111, it is selected whether the first pressing plate portion 91 or the second pressing plate portion 92 of the pressing member 9 is used to press the side installation body support portion 622. As shown in FIG. 6, when the riser form support part 6 is supported by the side form 3, the side installation body support part 622 is placed on the upper surface of the upper plate part 31 of the side form 3, and the side installation body support part 622 and the upper plate part 31 of the side form 3 are clamped with a clamp 96 or the like.

As shown in FIG. 8, the support spacing retainer 7 has a first support side member 71, a second support side member 72, and a connecting member 73. The first support side member 71 is attached to one of the two kick-in formwork supports 6 arranged at a distance in the front-rear direction. The second support side member 72 is attached to the other of the two kick-in formwork supports 6 arranged at a distance in the front-rear direction. The connecting member 73 connects the first support side member 71 and the second support side member 72. The first support side member 71 and the second support side member 72 are formed in the same shape. In this embodiment, the first support side member 71 is attached to the front kick-in formwork support 6, and the second support side member 72 is attached to the rear kick-in formwork support 6.

The first support part side member 71 has a first connecting plate part 711 and a first claw part 712. The first connecting plate portion 711 is formed into a flat plate shape, and is arranged so that the plate surface faces the width direction. The first claw portion 712 is formed into a flat plate shape, has a plate surface facing in the front-rear direction, and protrudes from the front edge of the first connecting plate portion 711 to one side in the width direction. In the first connecting plate portion 711, a claw connecting portion 713 located on the front side is formed smaller in the vertical direction than a connecting portion 714 located on the rear side. Connected to the connecting portion 714 of the first connecting plate portion 711 is a cylindrical first support spacing female screw portion 715 that protrudes from the edge of the hole penetrating the plate surface to one side in the width direction. Notches 716 are formed at the upper and lower edges of the claw connecting portion 713. A notch 716 formed at the upper edge of the claw connecting portion 713 is open upward. A notch 716 formed at the lower edge of the claw connecting portion 713 opens downward. The first support part side member 71 and the second support part side member 72 are formed in shapes that are symmetrical in the front-rear direction. The parts corresponding to the first connecting plate part 711, the first claw part 712, the first support part spacing female screw part 715, and the notch part 716 in the second support part side member 72 are connected to the second connecting plate part 721, the second claw part section 722, a second support section spacing female screw section 725, and a notch section 726.

The connecting member 73 is formed as a long member having a C-shaped cross section. The connecting member 73 is arranged to extend in the front-rear direction. The connecting member 73 includes a third connecting plate portion 731, an upper protruding piece 732, and a lower protruding piece 733. The third connecting plate portion 731 is formed into a flat plate shape, and is arranged so that the plate surface faces in the width direction. The third connecting plate portion 731 is formed to extend in the front-rear direction. The upper protruding piece 732 protrudes from the upper edge of the third connecting plate portion 731 to one side in the width direction. The lower protruding piece 733 protrudes from the lower edge of the third connecting plate portion 731 to one side in the width direction. A connecting member groove portion 735 is formed in the connecting member 73 and is surrounded by a third connecting plate portion 731, an upper protruding piece 732, and a lower protruding piece 733.

In the support part spacing holding part 7, the first support part side member 71 and the second support part side member 72 are arranged in the front-rear direction, and the first support part side member 71 and the second support part side member 72 are arranged in the width direction. A connecting member 73 is placed on the other side of the connecting member 73 . The first connecting plate part 711 and the second connecting plate part 721 are arranged inside the connecting member groove part 735. In the connecting member 73, the third connecting plate part 731 overlaps the other side in the width direction of the first connecting plate part 711 and the second connecting plate part 721, and the upper protruding piece 732 overlaps the first connecting plate part 711 and the second connecting plate part 721. The lower protruding piece 733 is arranged on the plate part 721 and below the first connecting plate part 711 and the second connecting plate part 721.

When the first connecting plate portion 711 and the second connecting plate portion 721 overlap the third connecting plate portion 731 as described above, the connecting slit 734 of the third connecting plate portion 731 is arranged to overlap the first support part spacing retaining female screw portion 715 of the first connecting plate portion 711 and the second support part spacing retaining female screw portion 725 of the second connecting plate portion 721. By fastening the screws 741, 742 inserted into the connecting slit 734 from the other side in the width direction to the first support part spacing retaining female screw portion 715 and the second support part spacing retaining female screw portion 725, respectively, the first connecting plate portion 711 and the second connecting plate portion 721 are fixed to the third connecting plate portion 731, and the first support part side member 71 and the second support part side member 72 are connected via the connecting member 73. The first support part side member 71 and the second support part side member 72 are configured to be able to adjust the positions at which they are fixed to each other within the length range of the connecting slit 734 in the front-rear direction. This allows adjustment of the distance between the first claw portion 712 at the front end of the first support portion side member 71 and the second claw portion 722 at the rear end of the second support portion side member 72. Figures 8(a) and (b) show a support portion spacing retainer 7 in which the distance between the first claw portion 712 and the second claw portion 722 is large, and Figure 8(d) shows a support portion spacing retainer 7 in which the distance between the first claw portion 712 and the second claw portion 722 is small.

The support part spacing holding part 7 is inserted from the front side into the fourth slit 664 of the riser formwork support part 6 in which the first claw part 712 is located on the front side, and the riser formwork support part in which the second claw part 722 is located in the rear side. It is inserted into the second slit 662 of the section 6 from the front side. By doing so, the support part spacing holding part 7 can maintain the distance between the fourth slit 664 of the riser form support part 6 located on the front side and the second slit 662 of the riser form support part 6 located on the rear side. It is configured to keep constant. The distance between the first claw part 712 and the second claw part 722 of the support part spacing holding part 7 is the same as that between the fourth slit 664 of the riser formwork support part 6 on the front side and the second slit of the riser formwork support part 6 on the rear side. The positions of the first connecting plate part 711 and the second connecting plate part 721 are adjusted so that the distance between the first connecting plate part 711 and the second connecting plate part 721 is the same as that of the slit 662. 3 connection plate portion 731.

As shown in Figures 9 and 10, the formwork spacing retaining portion 8 has a first member 81 and a second member 82. The first member 81 is fixed to the front kick-in formwork 5 of the two kick-in formworks 5 arranged at a distance in the front-rear direction. The second member 82 contacts, from the front, the rear kick-in formwork 5 of the two kick-in formwork support portions 6 arranged at a distance in the front-rear direction.

The first member 81 has an upper plate part 811 , a first side plate part 812 , a second side plate part 813 , and a front plate part 814 . The upper plate portion 811 is formed into a flat plate shape and arranged so that the plate surface is a horizontal plane. Notches 818 are formed on both sides of the front portion of the upper plate portion 811 in the width direction. The front portion of the upper plate portion 811 is smaller in the width direction than the rear portion. The dimension of the cutout portion 818 in the front-rear direction is set to approximately the same value as the dimension of the riser formwork 5 in the front-rear direction. The upper plate portion 811 has a first slit 815 and a second slit 816 that penetrate through the plate surface. The first slit 815 and the second slit 816 extend in the front-rear direction. The first slit 815 and the second slit 816 are arranged at intervals in the width direction, and the first slit 815 is arranged on one side of the second slit 816 in the width direction. Two openings 817 are formed in the upper plate portion 811 between a first slit 815 and a second slit 816 that penetrate through the plate surface.

The first side plate portion 812 is formed into a flat plate shape, and is arranged so that the plate surface faces in the width direction. The first side plate portion 812 protrudes downward from one edge in the width direction rearward of the notch portion 818 of the upper plate portion 811 . The second side plate portion 813 is formed into a flat plate shape, and is arranged so that the plate surface faces in the width direction. The second side plate part 813 protrudes downward from the edge on the other side in the width direction behind the notch part 818 of the upper plate part 811 . The front plate portion 814 is formed into a flat plate shape, and is arranged so that the plate surface faces the front-rear direction. The front plate part 814 projects downward from the front edge of the upper plate part 811. The distance between the rear surface of the front plate part 814 and the front edges of the first side plate part 812 and the second side plate part 813 is set to the same value as the thickness dimension (dimension in the front-rear direction) of the riser formwork 5. As will be described later, the upper end of the riser formwork 5 is inserted between the rear surface of the front plate part 814 and the front edges of the first side plate part 812 and the second side plate part 813. The side plate portion 812 and the second side plate portion 813 are configured to sandwich the upper end portion of the riser formwork 5. A structure in which the front plate part 814, the first side plate part 812, and the second side plate part 813 sandwich the upper end part of the riser formwork 5 is defined as a holding part 85.

The second member 82 has an upper plate part 821 , a first side plate part 822 , and a second side plate part 823 . The upper plate part 821 is formed into a flat plate shape and is arranged so that the plate surface is a horizontal plane. A cylindrical first female threaded portion 824 and a second female threaded portion 825 that protrude downward in the width direction from the edge of a hole penetrating the plate surface are connected to the upper plate portion 821 . The first female threaded portion 824 and the second female threaded portion 825 are provided near the front edge of the upper plate portion 821 and spaced apart from each other in the width direction. The first female threaded portion 824 and the second female threaded portion 825 are arranged at intervals in the width direction, and the first female threaded portion 824 is arranged on one side of the second female threaded portion 825 in the width direction. The upper plate part 821 has two openings that penetrate the plate surface on the other side in the width direction than the first female thread part 824 and on the one side in the width direction than the second female thread part 825, and are spaced apart in the width direction. It is formed.

The first side plate portion 822 is formed into a flat plate shape, and is arranged so that the plate surface faces in the width direction. The first side plate portion 822 protrudes downward from one edge of the upper plate portion 821 in the width direction. In the first side plate portion 822, the rear portion thereof protrudes lower than the front portion. The second side plate portion 823 is formed into a flat plate shape, and is arranged so that the plate surface faces in the width direction. The second side plate portion 823 protrudes downward from the other edge of the upper plate portion 821 in the width direction. In the second side plate portion 823, the rear portion thereof protrudes lower than the front portion. The portions of the first side plate portion 822 and the second side plate portion 823 that protrude below the rear portions are referred to as holding portion protruding pieces 84 . The rear edge portions of the first side plate portion 822 and the second side plate portion 823 extend linearly in the vertical direction, and are formed so that the rear edge portion of the upper plate portion 821 is at the same position in the front-rear direction. . The rear edge portion of the upper plate portion 821, the rear edge portion of the first side plate portion 822, and the rear edge portion of the second side plate portion 823 are combined to form the rear edge portion 83 of the form spacing holding portion 8.

The formwork spacing retainer 8 is positioned so that the rear portion of the first member 81 overlaps the front portion of the second member 82. The upper plate portion 811 of the first member 81 overlaps the upper plate portion 821 of the second member 82, the first side plate portion 812 of the first member 81 overlaps one widthwise side of the first side plate portion 822 of the second member 82, and the second side plate portion 813 of the first member 81 overlaps the other widthwise side of the second side plate portion 823 of the second member 82.

When the first member 81 and the second member 82 are overlapped as described above, the first slit 661 of the first member 81 and the first female threaded portion 824 of the second member 82 are arranged to overlap, and the second slit 662 of the first member 81 and the second female threaded portion 825 of the second member 82 are arranged to overlap. The first member 81 and the second member 82 can be fixed by fastening the screw 861 inserted into the first slit 661 from the other side of the width direction to the first female threaded portion 824 and fastening the screw 862 inserted into the third slit 663 from the upper side to the second female threaded portion 825. The first member 81 and the second member 82 are configured to be adjustable in the position where they are fixed to each other within the length range of the first slit 661 and the second slit 662. 9(a) and (b) show a form spacing retainer 8 with a large gap between the front plate portion 814 and the rear edge portion 83, and FIG. 9(d) shows a form spacing retainer 8 with a small gap between the front plate portion 814 and the rear edge portion 83. In FIG. 9(d), the rear edge portion of the first member 81 and the rear edge portion of the second member 82 overlap.

The formwork spacing holding part 8 is arranged such that the front plate part 814 is in contact with the front end of the formwork top plate part 52 of the riser formwork 5 located on the front side. The rear edge portion 83 contacts the front surface of the riser forming plate portion 51 of the riser formwork 5 located on the rear side, and the first side plate portion 822 and the second side plate portion 823 of the second member 82 are fixed to the bottom of the formwork. It is placed on the plate part 53, and the lower edges of the first side plate part 822 and the second side plate part 823 are in contact with the upper surface of the formwork lower plate part 53. In order to attach the formwork spacing holding part 8 to the riser formwork 5, the front plate part 814 is fixed to the formwork top plate part 52 located on the front side, and the positions of the first member 81 and the second member 82 in the front-rear direction are adjusted. The first side plate part 822 and the second side plate part 823 are placed on the formwork lower plate part 53, and the rear edge part 83 is placed on the riser forming plate part 51 of the riser formwork 5 located on the rear side. The screws 861 and 862 are fastened to the first female threaded portion 824 and the first female threaded portion 824 by pressing them against the front surface.

Next, a method of constructing a staircase 2 using the staircase formwork 1 according to this embodiment will be explained.
First, as shown in FIG. 11, the side formwork 3 and the rear formwork 4 are installed.

Subsequently, the riser formwork support portion 6 is installed on the foundation 11 and the side formwork 3. The riser formwork supporting part 6 is installed at a position where the main body groove part 63 is located on the side of the riser formwork 5 and the upper surface of the main body lower plate part 614 is at the height of the lower surface of the riser formwork 5. In the step of installing the riser formwork support part 6, the mounting part 62 of the riser formwork support part 6 is fixed to the foundation 11 or the side formwork 3, and the riser formwork support part 6 is fixed to the mounting part 62 fixed to the foundation 11 or the side formwork 3. The main body part 61 of the formwork support part 6 may be attached, or after the main body part 61 is attached to the attachment part 62, the attachment part 62 may be fixed to the foundation 11 or the side formwork 3. In either case, the height position of the main body part 61 and the attachment part 62 is adjusted within the vertical length range of the first slit 661 and the third slit 663 (see FIG. 4). When the riser formwork support part 6 is installed on the foundation 11 or the side formwork 3, the lower end of the second body flange plate part 616 of the riser formwork support part 6 is at the height of the upper end of the riser 22 to be constructed. (the height of the tread).

Next, the support spacing retainer 7 is installed between adjacent kick-in form support parts 6 in the front-to-rear direction. The support spacing retainer 7 is placed on the inside of the adjacent kick-in form support parts 6 in the width direction (the side where the stairs 2 are constructed) and moved to the outside in the width direction (the side approaching the kick-in form support part 6), inserting the first claw part 712 into the fourth slit 664 of the kick-in form support part 6 located at the front side, and inserting the second claw part 722 into the second slit 662 of the kick-in form support part 6 located at the rear side. At this time, the first support part side member 71 and the second support part side member 72 are connected in a loosened state with the screws 741, 742 so that they can move relatively in the front-to-rear direction with respect to the connecting member 73. Then, the positions of the first support section side member 71 and the second support section side member 72 are adjusted to insert the first claw portion 712 into the fourth slit 664 of the kick-in form support section 6 located at the front side, and the second claw portion 722 into the second slit 662 of the kick-in form support section 6 located at the rear side. A screw 741 is fastened to the first support section spacing retaining female threaded portion 715, and a screw 742 is fastened to the second support section spacing retaining female threaded portion 725, thereby fixing the first support section side member 71 and the second support section side member 72 via the connecting member 73. This keeps a constant interval between the fourth slit 664 of the kick-in form support section 6 located at the front side and the second slit 662 of the kick-in form support section 6 located at the rear side, and keeps a constant interval between adjacent kick-in form support sections 6 in the front-rear direction. In this embodiment, the cutout 716 (see FIG. 5) of the support spacing retainer 7 overlaps with the third slit 663 of the kick-in form support part 6 located at the front, and the cutout 726 (see FIG. 5) overlaps with the first slit 661 of the kick-in form support part 6 located at the rear. The support spacing retainer 7 and the kick-in form support part 6 located at the front are connected by screws inserted through the cutout 716 and the third slit 663, and the support spacing retainer 7 and the kick-in form support part 6 located at the rear are connected by screws inserted through the cutout 726 and the first slit 661.

Next, as shown in Figure 12, the kick-in formwork 5 is attached to the kick-in formwork support part 6. The widthwise end of the kick-in formwork 5 is inserted into the body groove part 63 of the kick-in formwork support part 6, and the kick-in formwork 5 is placed on the body lower plate part 614 of the kick-in formwork support part 6.

Next, as shown in Figure 1, the formwork spacing retainer 8 is installed between adjacent kick-in formwork 5 in the front-to-rear direction. First, the first member 81 and the second member 82 of the formwork spacing retainer 8 are connected in a loose state with the screws 861, 862 loosened so that they can move relatively in the front-to-rear direction. Then, the upper end of the kick-in formwork 5 is inserted between the rear surface of the front plate 814 of the first member 81 and the front edges of the first side plate 812 and the second side plate 813, and the upper end of the kick-in formwork 5 is clamped between the front plate 814 and the first and second side plate 812 and 813. The positions of the first member 81 and the second member 82 in the front-rear direction are adjusted, and the retaining portion protruding piece 84 of the rear portion of the first side plate portion 822 and the second side plate portion 823 of the second member 82 is placed on the lower plate portion 53 of the formwork, and the rear edge portion 83 of the second member 82 is pressed against and brought into contact with the front surface of the kick-in forming plate portion 51 of the kick-in formwork 5 located at the rear. Once the position of the second member 82 relative to the first member 81 is determined, the screws 861, 862 are tightened into the first female thread portion 824 and the second female thread portion 825. This keeps the distance between the upper plate portion 52 of the formwork of the front kick-in formwork 5 and the kick-in forming plate portion 51 of the rear kick-in formwork 5 constant, and keeps the distance between adjacent kick-in formworks 5 in the rear direction constant.

Subsequently, concrete is placed inside the stair formwork 1. In this embodiment, the lower end portions of the riser formwork 5 and the riser form support portion 6 are at the height of the lower end 22a (see FIG. 2) of the corresponding riser 22, that is, the height of the lower step portion 21 of the corresponding riser 22. This is the height of the tread 23. Further, as described above, the lower end of the second body flange plate 616 of the riser formwork support 6 is set at the height of the upper end of the riser 22 to be constructed (the height of the tread 23 of the upper step 21). It is located above the Therefore, when concrete is poured, the rear surface of the riser formwork 5 and the rear surface of the second main body side plate part 613 of the riser form support part 6 come into contact with the concrete, and the riser formwork 5 and the riser form support part 6 as well The parts do not come into contact with concrete and are not buried in concrete.

Subsequently, once the concrete has hardened, the stair formwork 1 is removed. As mentioned above, since the stair formwork 1 is not buried in concrete, it can be completely removed.

Next, the operation and effect of the staircase formwork 1 according to the present embodiment described above will be described with reference to the drawings.
In the staircase formwork 1 according to this embodiment, the kick-in formwork support part 6 can be supported by a side installation body (foundation 11 of the building, side formwork 3) that is installed or temporarily installed on the side of the staircase 2. Since the kick-in formwork 5 is supported by the kick-in formwork support part 6 supported by the side installation body, it is not necessary to fix the kick-in formwork 5 to the side installation body with a fastener such as a nail. Since the height position of the kick-in formwork support part 6 is adjustable, the kick-in formwork 5 can be installed at a desired height. Furthermore, since the lower end (main body lower plate part 614) of the kick-in formwork support part 6 is installed so as to be located at approximately the same height as the lower end 22a of the kick 22 corresponding to the kick-in formwork 5 that it supports, the kick-in formwork support part 6 and the kick-in formwork 5 are not buried in concrete. This makes it possible to reuse the kick-in formwork support part 6 and the kick-in formwork 5.

In addition, in the staircase formwork 1 according to this embodiment, the kick-in formwork support part 6 has a main body groove part 63 (concave part), and a main body lower plate part 614 (lower support part) is provided at the lower end of the main body groove part 63. The kick-in formwork 5 has its side end inserted into the main body groove part 63 and is placed on the main body lower plate part 614. With this configuration, the kick-in formwork 5 can be easily installed on the kick-in formwork support part 6 without using fasteners such as nails.

In the staircase formwork 1 according to this embodiment, the kick-in formwork support part 6 has a support part main body 64 that supports the kick-in formwork 5, and a fixing part 65 that is connected to the support part main body 64 and fixed to the side installation body. The first connection flange part 626 (first fixing part) and the second connection flange part 627 (second fixing part) of the fixing part 65 are arranged away from the side installation body. With this configuration, when fixing the first connection flange part 626 and the second connection flange part 627 to the side installation body, it is possible to secure space to install fixing members or the like for fixing the first connection flange part 626 and the second connection flange part 627 to the side installation body.

In addition, in the staircase formwork 1 according to this embodiment, the lower end of the first connection flange portion 626 on the front side of the support body 64 is located above the lower end 22a of the kicker 22 formed by the kicker formwork 5 supported by the support body 64. With this configuration, the first connection flange portion 626 is not embedded in the concrete of the lower (front) step 21, and the kicker formwork support portion 6 can be easily removed after the concrete of the staircase 2 has hardened.

In addition, in the stair formwork 1 according to the present embodiment, the lower end of the second connection flange plate part 627 on the rear side of the support part main body 64 is connected to the riser 22 formed by the riser formwork 5 supported by the support part main body 64. It is located above the top edge. With such a configuration, the second connecting flange plate portion 627 is not buried in concrete, and the riser form support portion 6 can be easily removed after the concrete of the stairs 2 has hardened.

The staircase formwork 1 according to this embodiment also has a support part spacing retaining part 7 (first spacing retaining part) that maintains the spacing between adjacent kick-in formwork support parts 6 in the front-to-rear direction at a specified dimension. This configuration makes it easy to manage the spacing between the kick-in formwork support parts 6, i.e., the spacing between the kick-in formwork 5, improving workability and construction quality.

Further, in the stair formwork 1 according to the present embodiment, the support part spacing holding part 7 inserts the first claw part 712 into the fourth slit 664 of the riser formwork support part 6 located on the front side from the width direction, and The claw portion 722 is configured to be inserted into the second slit 662 of the riser form support portion 6 located on the rear side from the width direction. With such a configuration, even if a force is applied so that the riser formwork supports 6 adjacent to each other in the front-rear direction move relative to each other in the front-rear direction, the riser form support parts 6 adjacent to each other in the front-rear direction will not move. The spacing can be maintained constant.

The staircase formwork 1 according to this embodiment also has a formwork spacing retaining section 8 (second spacing retaining section) that maintains the spacing between adjacent kick-in formworks 5 in the front-to-rear direction at a specified dimension. This configuration makes it easy to manage the spacing between the kick-in formworks 5, improving workability and construction quality.

Moreover, in the stair formwork 1 according to the present embodiment, the holding part protruding piece 84 of the formwork interval holding part 8 is connected to the formwork lower plate part 53 (formwork protrusion piece). With such a configuration, it is possible to prevent the holding portion protruding piece 84 from being buried in concrete. Moreover, the formwork interval holding section 8 can be installed in a stable state.

In the staircase formwork 1 according to this embodiment, the upper end of the kick-in formwork 5 is located above the upper end of the kick-in 22. The formwork spacing retainer 8 is configured so that the upper end of the kick-in formwork 5 is inserted between the rear surface of the front plate 814 and the front edges of the first and second side plate 812 and 813, and the front plate 814 and the first and second side plate 812 and 813 (clamping portion 85) clamp the upper end of the kick-in formwork 5. This configuration prevents the clamping portion 85 from being embedded in the concrete. Also, the formwork spacing retainer 8 can be installed in a stable state.

Although the embodiments of the stair formwork 1 according to the present invention have been described above, the present invention is not limited to the above-described embodiments, and can be modified as appropriate without departing from the spirit thereof.
For example, although the stair formwork 1 of the above embodiment is made of steel, it may also be partially made of wood. Further, in the above embodiment, the main body lower plate part 614 on which the riser formwork 5 is placed is provided at the lower end of the riser formwork support part 6, and the main body lower plate part 614 has approximately the same height as the lower end 22a of the riser 22. It is placed in the middle of the day. On the other hand, the riser formwork support part 6 supports the middle part and upper part of the riser formwork 5 in the vertical direction, so that the lower end of the riser formwork 5 is located above the lower end of the riser formwork 5. You may also do so.

Further, in the embodiment described above, the riser formwork support part 6 has a main body groove part 63 (concave part), and the side end part of the riser formwork 5 is inserted into the main body groove part 63. On the other hand, the main body groove 63 may not be formed in the riser form support 6, and the form in which the riser form support 6 supports the main body groove 63 may be other than the above.

Further, in the above embodiment, the first connecting collar plate part 626 and the second connecting collar plate part 627 of the riser formwork support part 6 are arranged apart from the side installation body. On the other hand, the first connection flange plate part 626 and the second connection flange plate part 627 for fixing the riser form support part 6 to the side installation body may be in contact with the side installation body. Moreover, the structure for fixing the riser formwork support part 6 to the side installation body may be other than the above.

In addition, in the above embodiment, a support spacing retainer 7 (first spacing retainer) is provided to maintain the spacing between adjacent kick-in form support parts 6 in the front-rear direction at a predetermined dimension. In contrast, the support spacing retainer 7 does not need to be provided in the staircase formwork 1. Also, the support spacing retainer 7 is configured so that the first claw 712 is inserted from the width direction into the fourth slit 664 of the kick-in form support part 6 located at the front, and the second claw 722 is inserted from the width direction into the second slit 662 of the kick-in form support part 6 located at the rear, but the form of the support spacing retainer 7 may be other than the above.

Further, in the embodiment described above, a formwork spacing holding section 8 (second spacing holding section) is provided that maintains the gap between riser formworks 5 adjacent to each other in the front-rear direction to a predetermined dimension. On the other hand, it is not necessary to provide the formwork interval holding section 8. Further, the formwork spacing holding part 8 is arranged such that the holding part protruding piece 84 is placed on the formwork lower plate part 53 (formwork protruding piece) that protrudes from the lower end of the riser formwork 5 on the rear side to the front side. However, it does not have to be configured this way. Further, the upper end of the riser formwork 5 is located above the upper end of the riser 22, and the formwork spacing holding section 8 includes a front plate section 814, a first side plate section 812, a second side plate section 813 (a clamping section 85 ) is configured to sandwich the upper end of the riser formwork 5, but this need not be the case.

1 Staircase formwork 2 Staircase 5 Kick-in formwork 6 Kick-in formwork support part 7 Support part spacing part (first spacing part)
8 Support portion spacing retaining portion (second spacing retaining portion)
21 Step portion 22 Riser 22a Lower end 57 Projecting piece 63 Main body groove portion (concave portion)
64 Support body 65 Fixing portion 84 Holding portion protruding piece 85 Clamping portion 614 Body lower plate portion (lower support portion)
615 First body flange portion (first fixing portion)
616 Second body flange portion (second fixing portion)
712 First claw portion 722 Second claw portion

Claims (10)

In the stair formwork used for constructing concrete stairs,
a riser formwork provided along the risers of the stairs;
Riser formwork support parts provided on both sides of the riser formwork and supporting the riser formwork,
The riser formwork support part is supported by a side installation body installed or temporarily installed on the side of the stairs so that the height position thereof can be adjusted,
The lower end of the riser form support is located at either approximately the same height as the lower end of the riser corresponding to the supported riser form, or at a height above the lower end of the riser. ,
The stair formwork is characterized in that the riser formwork support part has a recessed part that is open on the side where the supported riser formwork is arranged and into which a side end of the riser formwork is inserted . A lower support portion is provided at the lower end of the recessed portion,
The stair formwork according to claim 1, wherein a side end of the riser formwork is inserted into the recessed part and placed on the lower support part. The kickback formwork support portion is
a support body having the recessed portion and the lower support portion and supporting the riser formwork;
A fixing part fixed to the support body;
and an attachment portion that attaches the fixing portion to the side installation body,
The staircase formwork according to claim 2 , wherein the mounting portion is adapted to mount the fixing portion to the side installation body such that the fixing portion is positioned apart from the side installation body. The fixing part is a first fixing part that is connected to the front side of the support body, which is one side in the front-rear direction where the steps of the stairs are arranged and is the side where the lower steps are located;
a second fixing part connected to the rear side of the support part main body on the other side in the front-rear direction, which is the side where the upper step part is located;
The stair formwork according to claim 3, wherein a lower end of the first fixing part is located above a lower end of a riser formed by the riser formwork supported by the support main body. The fixing portion includes a first fixing portion connected to a front side of the support body, the front side being a side on which the lower step is located, on one side in the front-rear direction in which the steps of the staircase are arranged;
a second fixing portion connected to a rear side of the support body, the rear side being the side where the upper step portion is located, on the other side in the front-rear direction of the support body;
5. The staircase formwork according to claim 3 or 4, characterized in that the lower end of the second fixing part is located above the upper end of the riser formed by the riser formwork supported by the support part main body. The staircase formwork according to any one of claims 1 to 5, characterized in that it has a first spacing retaining part that maintains a predetermined distance between adjacent riser formwork support parts in the front-to-rear direction in which the steps of the staircase are arranged. The first spacing holding part includes a first claw part that is inserted into one of the riser formwork support parts adjacent in the front-back direction from a direction crossing the front-back direction, and a first claw part inserted into the other riser formwork support part from a direction crossing the front-back direction. The stair formwork according to claim 6, further comprising a second claw portion to be inserted. The staircase formwork according to any one of claims 1 to 7, characterized in that it has a second spacing retaining part that maintains the spacing between adjacent riser formwork in the front-to-rear direction in which the steps of the staircase are arranged at a predetermined dimension. the second spacing retaining portion has a retaining portion protruding piece protruding downward at a rear end portion on a side where the upper step portion in the front-rear direction is located,
The staircase formwork according to claim 8, characterized in that the retaining portion protruding piece is placed on a formwork protruding piece that protrudes forward from the lower end of the rear riser formwork. The upper end of the riser formwork is located above the upper end of the riser,
9. The second spacing holding part has a holding part that holds the upper end part of the riser formwork on the front side, which is the side where the lower step in the front-back direction is located, from the front-back direction. 9. The stair formwork described in 9.

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