JP2021188366A - Staircase form - Google Patents

Abstract

To provide a staircase form allowing its installation to be carried out at a desired height without fixing a riser form on other forms and the like using fixtures and allowing its recycling.SOLUTION: A staircase form 1 used for constructing a concrete staircase 2 comprises: riser forms 5 provided along risers 22 of the staircase 2; and riser form support parts 6 provided on both sides of the riser form 5 supporting the riser forms 5, wherein the riser form support parts 6 are height-adjustably supported with side installed bodies (a building foundation 11 or side surface forms 3) installed or temporarily installed in a side direction of the staircase 2 so as to be positioned at either of substantially the same height of a lower end of the riser 22 (a tread surface 23 of a lower step part 21) corresponding to the riser form 5 supported with a lower end of the riser form support part 6 and a height higher than that of the lower end of the riser 22.SELECTED DRAWING: Figure 1

Description

The present invention relates to a staircase formwork.

Conventionally, in the construction of foundations of buildings (particularly industrialized houses), steel formwork that can withstand repeated use has been used. On the other hand, in the construction of soil concrete having stairs such as an entrance porch, a wooden formwork made of a control panel, rafters, etc. is generally used (see, for example, Patent Documents 1 and 2). When constructing concrete stairs, it is necessary to install the formwork of the riser so that it floats from the ground surface. At this time, if the formwork of the stairs is made of wood, the formwork of the riser floating from the ground surface can be easily fixed to another formwork with a fixture such as a nail. It can be easily installed at a desired height.

Japanese Unexamined Patent Publication No. 11-125007 Japanese Unexamined Patent Publication No. 2012-026096

Wooden formwork is more prone to deterioration than steel formwork. In addition, it is difficult to recycle a wooden formwork to which deteriorated concrete is attached. For this reason, the wooden formwork must be disposed of after one to several uses, which causes an increase in industrial waste. On the other hand, the steel formwork can be reused, but it is difficult to fix it to other formwork with a fixing tool such as a nail, so it is difficult to install it at a desired height as a formwork for kicking. ..

Therefore, according to the present invention, the kick-in formwork (kick-in formwork) can be installed at a desired height without being fixed to another formwork or the like with a fixture, and can be reused. The purpose is to provide staircase formwork.

In order to achieve the above object, the staircase formwork according to the present invention is a staircase formwork used for construction of a concrete staircase, the riser formwork provided along the riser of the staircase and both sides of the riser formwork. The rise formwork support portion is provided in the above and has a riser formwork support portion for supporting the riser formwork, and the riser formwork support portion has a height position on a side installation body installed or temporarily installed on the side of the staircase. Adjustably supported and at approximately the same height as the lower end of the rise corresponding to the rise formwork supported by the lower end of the rise formwork support, or above the lower end of the rise. It is characterized by being installed so as to be located.

In the present invention, the rise formwork support portion is supported by a lateral installation body installed or temporarily installed on the side of the stairs, so that the rise formwork support portion is located on the side of the stairs or the foundation of a building. It can be supported by a formwork temporarily installed on the side of the stairs. Since the rise form is supported by the rise form support portion supported by the side installation body, it is not necessary to fix the rise form to the side installation body with a fixing tool such as a nail. Since the height position of the riser formwork support portion can be adjusted, the riser formwork can be installed at a desired height. Further, by installing the riser formwork support portion so that the lower end of the riser formwork support portion is located at substantially the same height as the lower end portion of the riser or at a height above the lower end portion of the riser, the riser formwork support portion and the riser formwork support portion and the riser formwork support portion are installed. The riser formwork is never buried in concrete. This makes it possible to reuse the riser formwork support portion and the riser formwork.

Further, in the staircase formwork according to the present invention, the riser formwork support portion has a concave portion that opens to the side where the riser formwork to be supported is arranged, and a lower support portion is provided at the lower end of the concave portion. A portion is provided, and the riser formwork may be placed on the lower support portion with a side end inserted into the concave portion.
With such a configuration, the riser formwork can be easily installed on the riser formwork support portion without using a fixing tool such as a nail.

Further, in the staircase formwork according to the present invention, the riser formwork support portion has the concave portion and the lower support portion, and is connected to the support portion main body that supports the riser formwork and the support portion main body. It has a fixing portion fixed to the side-installed body, and the fixing portion may be arranged apart from the side-installed body.
With such a configuration, when fixing the fixed portion and the side-installed body, a space for installing a fixing member or the like for fixing each other between the fixed portion and the side-installed body is secured. be able to.

Further, in the staircase formwork according to the present invention, the fixing portion is connected to the front side of the support portion main body, which is one side in the front-rear direction in which the step portions of the staircase are arranged, and which is the side where the lower step portion is located. The first fixing portion is composed of a first fixing portion to be formed and a second fixing portion connected to the rear side on the other side of the support portion main body in the front-rear direction, which is the side where the upper step portion is located. The lower end of the shaft may be located above the lower end of the riser formed by the riser formwork supported by the support portion main body.
With such a configuration, the first fixing portion is not embedded in the concrete of the lower (front side) step portion, and the rise formwork support portion can be easily removed after the concrete of the stairs is hardened. ..

Further, in the staircase formwork according to the present invention, the fixing portion is connected to the front side of the support portion main body, which is one side in the front-rear direction in which the step portions of the staircase are arranged, and which is the side where the lower step portion is located. The second fixing portion is composed of a first fixing portion to be formed and a second fixing portion connected to the rear side on the other side of the support portion main body in the front-rear direction, which is the side where the upper step portion is located. The lower end of the shaft may be located above the upper end of the rise formed by the rise form supported by the support body.
With such a configuration, the second fixing portion is not embedded in the concrete, and the rise formwork support portion can be easily removed after the concrete of the stairs has hardened.

Further, the staircase formwork according to the present invention has a first spacing holding portion that maintains the spacing between the riser formwork supporting portions adjacent to each other in the front-rear direction in which the stepped portions of the stairs are arranged to a predetermined dimension. May be good.
With such a configuration, the spacing between the riser formwork support portions, that is, the spacing between the riser formwork can be easily managed, and the workability can be improved and the construction quality can be improved.

Further, in the staircase formwork according to the present invention, the first space holding portion is a first claw portion inserted into one of the riser formwork support portions adjacent in the front-rear direction from a direction intersecting the front-rear direction. On the other hand, a second claw portion inserted from the direction intersecting the front-rear direction may be provided.
With such a configuration, even when a force is applied so that the adjacent kick-form support portions in the front-rear direction move relatively in the front-rear direction, the distance between the adjacent rise-form support portions in the front-rear direction can be increased. Can be kept constant.

Further, the staircase formwork according to the present invention may have a second spacing holding portion that maintains the spacing between the riser formwork adjacent to each other in the front-rear direction in which the steps of the staircase are arranged to a predetermined dimension. ..
With such a configuration, the spacing between the riser formwork can be easily managed, the workability is good, and the work quality can be improved.

Further, in the staircase formwork according to the present invention, the second spacing holding portion has a holding portion projecting piece that protrudes downward at the rear end portion on which the upper step portion in the front-rear direction is located. The holding portion projecting piece may be placed on a formwork projecting piece that projects forward from the lower end of the riser formwork on the rear side.
With such a configuration, it is possible to prevent the holding portion projecting piece from being embedded in the concrete. Further, the second interval holding portion can be installed in a stable state.

Further, in the staircase formwork according to the present invention, the upper end portion of the riser formwork is located above the upper end portion of the riser, and the second spacing holding portion has a lower step portion in the front-rear direction. It may have a holding portion for holding the upper end portion of the riser form on the front side, which is the side, from the front-rear direction.
With such a configuration, it is possible to prevent the sandwiched portion from being embedded in concrete. Further, the second interval holding 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-installed body such as another formwork with a fixture, and can be reused.

It is a perspective view which shows an example of the staircase formwork by embodiment of this invention. It is a perspective view which shows an example of the stairs by embodiment of this invention. It is another perspective view which shows an example of the staircase formwork by embodiment of this invention. (A) is a front view of the rise formwork support portion, (b) is a side view of the riser formwork support portion, and (c) is a plan view of the riser formwork support portion. It is a perspective view which shows the rise formwork support part supported by a foundation. It is a perspective view which shows the rise formwork support part supported by the side formwork. (A) is a front view of the holding member, (b) is a plan view of the holding member, and (c) is a side view of the holding member. (A) is a front view of the support portion spacing holding portion, (b) is a plan view of the support portion spacing holding portion, (c) is a side view of the support portion spacing holding portion, and (d) is a support portion in a reduced state. It is a top view of the space holding part. (A) is a front view of the formwork spacing holding portion, (b) is a plan view of the formwork spacing holding portion, (c) is a side view of the formwork spacing holding portion, and (d) is a reduced formwork. It is a top view of the space holding part. It is a perspective view which shows the formwork space holding part attached to the rise-in formwork. It is a perspective view which shows the construction method of the stairs. It is a perspective view which shows the construction method of the stairs following FIG.

Hereinafter, the staircase formwork 1 according to the embodiment of the present invention will be described with reference to FIGS. 1 to 12. The staircase formwork 1 according to the present embodiment shown in FIG. 1 is used, for example, when constructing a staircase 2 such as an entrance porch outside a building as shown in FIG. In the following description, the horizontal direction orthogonal to the width direction of the stairs 2 (direction of arrow X in the drawing) is defined as the front-back direction (direction of arrow Y in the drawing). In the front-rear direction, the side where the lower step 21 is arranged with respect to the upper step 21 is the front side, and the side where the upper step 21 is arranged with respect to the lower step 21 is the rear side. And. For a long member, the direction in which the member extends may be referred to as the length direction.

The staircase 2 of the present embodiment is provided so that one side in the width direction is 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) has a vertical surface facing in the width direction. In the staircase 2 of the present embodiment, a finishing portion is provided on the surface of the concrete portion to be constructed by the staircase formwork 1. Therefore, the concrete portion of the stairs 2 constructed by the staircase formwork 1 does not have a step nose, and a step nose is provided as a finishing portion. Therefore, the upper end portion of the riser 22 is continuous with the front end portion of the tread 23 of the upper step portion 21.

As shown in FIGS. 1 and 3, the staircase formwork 1 is arranged on a plurality of side surface formwork 3 arranged along the other side surface of the staircase 2 in the width direction and on the rear surface of the staircase 2. A plurality of rear formwork 4, a plurality of riser formwork 5 arranged along the surface of the riser 22 of the stairs 2, a plurality of riser formwork support portions 6 for supporting the riser formwork 5, and a front-rear direction. Support part spacing holding part 7 (first space holding part) that keeps the distance between adjacent risen formwork support parts 6 constant, and formwork space holding part that keeps the distance between adjacent kicking formwork 5s in the front-rear direction constant. 8 (second interval holding portion) and. The staircase formwork 1 of the present embodiment is a steel formwork.

The rise formwork support portion 6 is located on one side of the width direction of the stairs 2 with the rise formwork support portion 6A supported by the foundation 11 (side installation body) of the building located on one side of the stairs 2. It is composed of a rise-in formwork support portion 6B supported by a temporarily installed side formwork 3 (side installation body). The rise-in formwork support portion 6A and the rise-in formwork support portion 6B have the same shape, are installed in different directions, and are installed in a direction symmetrical in the width direction. The support portion spacing holding portion 7 is composed of a support portion spacing holding portion 7A attached to the rise formwork support portion 6A and a support portion spacing holding portion 7B attached to the rise formwork support portion 6B. The support portion spacing holding portion 7A and the support portion spacing holding portion 7B have the same shape, are installed in different orientations, and are installed in a direction symmetrical in the width direction. In the following, the details of the rise formwork support portion 6A supported by the foundation 11 of the building and the support portion spacing holding portion 7 attached to the rise formwork support portion 6A supported by the foundation 11 of the building will be described, and the side type will be described. The description of the riser form support portion B supported by the frame 3 and the support portion spacing holding portion 7B attached to the riser form support portion 6B supported by the side formwork 3 will be omitted.

Each of the plurality of side formwork 3 is formed in a plate shape, is parallel to the foundation side surface 12, and is arranged in the front-rear direction at intervals from the foundation side surface 12. Each of the plurality of rear surface formwork 4 is formed in a plate shape and is arranged in the width direction in the direction orthogonal to the foundation side surface 12. In the plurality of arranged rear surface formwork 4, one end in the width direction is in contact with the foundation 11, and the other end in the width direction is connected to the side formwork 3. The side formwork 3 and the rear surface formwork 4 are connected via a corner formwork 41 forming a corner portion. The side formwork 3 and the rear surface formwork 4 are each supported by the ground 13 by the support member 42.

As shown in FIG. 1, the rise form 5 includes a rise forming plate portion 51, a formwork upper plate portion 52, a formwork lower plate portion 53, a first formwork side plate portion 54, and a second formwork side plate. It has a portion 55 and a reinforcing rib 56. In the following description, it is assumed that the riser formwork 5 is in a posture arranged on the front side of the riser 22 as a formwork.

The rise-in forming plate portion 51 is a flat plate-shaped steel plate, and the plate surface is arranged so as to face the front-rear direction. The rear surface of the rise-in forming plate portion 51 forms the surface of the rise-in 22. The formwork upper plate portion 52 projects forward from the entire upper edge portion of the rise forming plate portion 51. A protruding piece 57 extending downward is provided at the front end portion of the formwork upper plate portion 52. The formwork lower plate portion 53 projects forward from the entire lower edge portion of the rise forming plate portion 51. The first formwork side plate portion 54 projects forward from one edge portion in the width direction of the rise forming plate portion 51. The second formwork side plate portion 55 projects forward from the other side edge portion in the width direction of the rise forming plate portion 51. The reinforcing rib 56 projects forward from the intermediate portion in the width direction of the rise forming plate portion 51. The protrusion dimensions from the rise-forming plate portion 51 of each of the formwork upper plate portion 52, the formwork lower plate portion 53, the first formwork side plate portion 54, and the second formwork side plate portion 55 are set to the same value. The protrusion dimension of the reinforcing rib 56 from the rise-forming plate portion 51 is the rise-forming plate portion 51 of the formwork upper plate portion 52, the formwork lower plate portion 53, the first formwork side plate portion 54 and the second formwork side plate portion 55. It is set to be less than or equal to the protrusion dimension from. The upper end portion of the reinforcing rib 56 is connected to the formwork upper plate portion 52, and the lower end portion of the reinforcing rib 56 is connected to the formwork lower plate portion 53.

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

As shown in FIGS. 4 to 6, the rise formwork support portion 6 has a main body portion 61 and a mounting portion 62. As shown in FIG. 4, the main body portion 61 has a main body groove portion 63 (concave portion) to which the riser formwork 5 (see FIG. 1) is attached. The mounting portion 62 is connected to the main body portion 61 and is supported by the foundation 11 or the side formwork 3 of the building. 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 hat-shaped member formed by processing a steel plate such as a thin steel plate, and is arranged in a direction extending in the vertical direction. The main body groove portion 63 extends in the vertical direction and opens on one side in the width direction. The main body portion 61 includes a main body outer plate portion 611, a first main body side plate portion 612, a second main body side plate portion 613, a main body lower plate portion 614 (lower support portion), and a first main body flange plate portion 615. It has a second main body flange plate portion 616. In the main body 61, the main body outer plate portion 611, the first main body side plate portion 612, the second main body side plate portion 613, and the main body lower plate portion 614 (lower support portion) form the support portion main body 64 that supports the rise formwork 5. The first main body flange plate portion 615 and the second main body flange plate portion 616 constitute a fixing portion 65 for fixing the rise formwork support portion 6 to the foundation 11 or the side formwork 3 of the building.

The outer plate portion 611 of the main body is formed in a flat plate shape having 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 as each other. The first main body side plate portion 612 and the second main body side plate portion 613 are formed in a flat plate shape having 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 as the length dimension of the main body outer plate portion 611. The first main body side plate portion 612 protrudes from the leading 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 projects from the trailing edge portion of the main body outer plate portion 611 to the other side in the width direction. The empty portion surrounded by the main body outer plate portion 611, the first main body side plate portion 612, and the second main body side plate portion 613 is the main body groove portion 63. The lower plate portion 614 of the main body is formed in a flat plate shape and is provided at the lower end portion of the groove portion 63 of the main body so that the plate surface is horizontal. It is connected to the lower edge portion of each of the 1 main body side plate portion 612 and the 2nd main body side plate portion 613.

The side end portion of the riser form 5 is inserted into the main body groove portion 63. The groove width of the main body groove portion 63 is substantially the same as the thickness dimension (dimension in the front-rear direction) of the riser formwork 5. The rise-in form 5 is installed in a state where the side end portions on both sides in the width direction are inserted into the main body groove portion 63 and placed on the main body lower plate portion 614. The main body groove portion 63 is formed to be longer than the height dimension of the riser form 5.

The first main body flange plate portion 615 is formed in a flat plate shape having a long rectangular plate surface. The first main body flange plate portion 615 is formed to have a smaller dimension in the length direction 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 portion 615 projects forward from the tip end portion (the other edge portion in the width direction) of the first main body side plate portion 612. The upper end portion of the first main body flange plate portion 615 is located at the same height as the upper end portion of the first main body side plate portion 612. The lower end portion of the 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 flange plate portion 615 of the main body is arranged above the lower plate portion 614 of the main body.

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

The first main body flange plate portion 615 is formed with a first slit 661 and a second slit 662 extending in the vertical direction and penetrating the plate surface, respectively. 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 in front of the second slit 662. Two first slits 661 and two second slits 662 are formed on the flange plate portion 615 of the first main body at intervals in the vertical direction. The second main body flange plate portion 616 is formed with a third slit 663 and a fourth slit 664, which extend in the vertical direction and penetrate the plate surface, respectively. 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 behind the fourth slit 664. Three third slits 663 and four fourth slits 664 are formed in the flange plate portion 616 of the second main body at intervals in the vertical direction.

The mounting portion 62 has a main body connecting portion 621 connected to the main body portion 61, and a side installation body supporting portion 622 supported by the foundation 11 of the building or the side formwork 3. The main body connection portion 621 is arranged so that the cross-sectional shape is a hat shape and extends 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. ing. The connecting outer plate portion 623 is formed in a flat plate shape having a long rectangular plate surface. The connection outer plate portion 623 is arranged so that 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 as each other. The first connection side plate portion 624 and the second connection side plate portion 625 are formed in a flat plate shape having a long rectangular plate surface. The first connection side plate portion 624 projects from the leading edge portion of the connection outer plate portion 623 to the other side in the width direction. The second connection side plate portion 625 projects from the trailing edge portion of the connection outer plate portion 623 to the other side in the width direction.

The first connection side plate portion 624, the second connection side plate portion 625, the first connection flange plate portion 626, and the second connection flange plate portion 627 have the same length dimension (vertical dimension). The connection outer plate portion 623 is longer than the first connection side plate portion 624, the second connection side plate portion 625, the first connection flange plate portion 626, and the second connection flange plate portion 627. The upper ends of the first connection side plate portion 624, the second connection side plate portion 625, the first connection flange plate portion 626 and the second connection flange plate portion 627 are located at the same height, and the first connection side plate portion 624 is located. It protrudes below the other plates. The main body connection portion 621 is formed with a connection groove portion 628 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 flange plate portion 626 and the second connecting flange plate portion 627 are formed in the same shape with each other. The first connecting flange plate portion 626 and the second connecting flange plate portion 627 are formed in a flat plate shape having a long rectangular plate surface. The first connecting flange plate portion 626 projects forward from the tip end portion (the other edge portion in the width direction) of the first connecting side plate portion 624. The second connecting flange plate portion 627 projects rearward from the tip portion (the other edge portion in the width direction) of the second connecting side plate portion 625. A cylindrical first connecting female threaded portion 626a projecting from the edge of the hole penetrating the plate surface to one side in the width direction is connected to the first connecting flange plate portion 626. A cylindrical second connecting female threaded portion 627a projecting from the edge of the hole penetrating the plate surface to one side in the width direction is connected to the second connecting flange plate portion 627. The mounting portion 62 of the present embodiment is provided with two first connecting female threaded portions 626a and two second connecting female threaded portions 627a at intervals in the vertical direction.

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

The mounting portion 62 is set to have a smaller vertical dimension than the main body portion 61. The mounting portion 62 is arranged so as to overlap with one side in the width direction of the upper side of the main body portion 61. 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 are fitted into the main body groove portion 63. The connection outer plate portion 623 is arranged so as to overlap with one side in the width direction of the main body outer plate portion 611. The first connection side plate portion 624 is arranged so as to overlap the front side of the first main body side plate portion 612. The second connection side plate portion 625 is arranged so as to overlap the rear side of the second main body side plate portion 613. The first connecting flange plate portion 626 is arranged so as to overlap with one side in the width direction of the first main body flange plate portion 615. The second connecting flange plate portion 627 is arranged so as to overlap with one side in the width direction of the second main body flange plate portion 616. The side-installed body support portion 622 projects on one side in the width direction, that is, on the side away from the main body portion 61.

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

The height of the main body 61 and the mounting 62 fixed to each other can be adjusted within the vertical length range of the first slit 661 and the third slit 663 in a state where the screws 671 and 672 are not fastened. It is configured. In the height adjustment between the main body portion 61 and the mounting portion 62, the upper surface of the main body lower plate portion 614 of the main body portion 61 becomes the height of the lower end portion of the rise formwork 5, and the side mounting body support portion 622 of the mounting portion 62 Adjust so that the lower surface is the height of the upper surface of the foundation 11 of the building or the upper surface of the side formwork 3. After adjusting the height of the main body portion 61 and the mounting portion 62, the screws 671 and 672 are fastened.

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

In the pressing member 9, either the first pressing plate portion 91 or the second pressing plate portion 92 is placed so as to overlap with the side-installed body support portion 622 mounted on the upper surface of the foundation 11. As shown in FIG. 5, assuming that the first holding plate portion 91 is placed on top of the side-installed body support portion 622, the anchor of the foundation 11 is placed in the first holding plate slit 93 of the first holding plate portion 91. Insert the bolt 111 and fasten the nut to the anchor bolt 111. As a result, the position of the holding member 9 is fixed, the side installation body support portion 622 is sandwiched between the first holding plate portion 91 and the upper surface of the foundation 11, and the rise formwork support portion 6 is fixed to the foundation 11. The formwork. Depending on the position of the anchor bolt 111, it is selected whether to hold the side-installed body support portion 622 with the first holding plate portion 91 or the second holding plate portion 92 of the holding member 9. As shown in FIG. 6, when the riser formwork support portion 6 is supported by the side formwork 3, the side-installed body support portion 622 is placed on the upper surface of the upper plate portion 31 of the side formwork 3. The side-installed body support portion 622 and the upper plate portion 31 of the side formwork 3 are sandwiched by a clamp 96 or the like.

As shown in FIG. 8, the support portion spacing holding portion 7 has a first support portion side member 71, a second support portion side member 72, and a connecting member 73. The first support portion side member 71 is attached to one of two rise form support portions 6 arranged at intervals in the front-rear direction. The second support portion side member 72 is attached to the other of the two rise form support portions 6 arranged at intervals in the front-rear direction. The connecting member 73 connects the first support portion side member 71 and the second support portion side member 72. The first support portion side member 71 and the second support portion side member 72 are formed in the same shape. In the present embodiment, the first support portion side member 71 is attached to the front kick form support portion 6, and the second support portion side member 72 is attached to the rear rise form support portion 6.

The first support portion side member 71 has a first connecting plate portion 711 and a first claw portion 712. The first connecting plate portion 711 is formed in a flat plate shape, and is arranged so that the plate surface faces the width direction. The first claw portion 712 is formed in a flat plate shape, the plate surface faces in the front-rear direction, and the first claw portion 712 projects from the leading edge portion of the first connecting plate portion 711 to one side in the width direction. In the first connecting plate portion 711, the claw portion connecting portion 713 located on the front side is formed to be smaller in the vertical direction than the connecting portion 714 located on the rear side. To the connecting portion 714 of the first connecting plate portion 711, a cylindrical first support portion spacing holding female screw portion 715 projecting from the edge portion of the hole portion penetrating the plate surface to one side in the width direction is connected. Notches 716 are formed in the upper and lower edges of the claw connection portion 713. The notch 716 formed at the upper edge of the claw connection portion 713 is open upward. The notch 716 formed at the lower edge of the claw connection portion 713 is open downward. The first support portion side member 71 and the second support portion side member 72 are formed in a shape symmetrical in the front-rear direction. The portions corresponding to the first connecting plate portion 711, the first claw portion 712, the first support portion spacing holding female screw portion 715, and the notch portion 716 in the second support portion side member 72 are the second connecting plate portion 721 and the second claw. The portion 722, the second support portion spacing holding female screw portion 725, and the notch portion 726 are used.

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

In the support portion spacing holding portion 7, the first support portion side member 71 and the second support portion side member 72 are arranged in the front-rear direction, and the width direction of the first support portion side member 71 and the second support portion side member 72. The connecting member 73 is arranged so as to overlap with each other on the other side of the. The first connecting plate portion 711 and the second connecting plate portion 721 are arranged inside the connecting member groove portion 735. In the connecting member 73, the third connecting plate portion 731 overlaps the other side in the width direction of the first connecting plate portion 711 and the second connecting plate portion 721, and the upper protruding piece 732 overlaps the first connecting plate portion 711 and the second connecting plate portion 711. It is arranged above the plate portion 721, and the lower protruding piece 733 is arranged below the first connecting plate portion 711 and the second connecting plate portion 721.

When the first connecting plate portion 711 and the second connecting plate portion 721 and the third connecting plate portion 731 overlap as described above, the connecting slit 734 of the third connecting plate portion 731 becomes the first of the first connecting plate portion 711. It is arranged so as to overlap with the second support portion spacing holding female screw portion 725 of the support portion spacing holding female screw portion 715 and the second connecting plate portion 721. The first connecting plate portion is formed by fastening the screws 741 and 742 inserted into the connecting slit 734 from the other side in the width direction to each of the first support portion spacing holding female screw portion 715 and the second support portion spacing holding female screw portion 725. The 711 and the second connecting plate portion 721 are fixed to the third connecting plate portion 731, and the first support portion side member 71 and the second support portion side member 72 are connected via the connecting member 73. The first support portion side member 71 and the second support portion side member 72 are configured so that the positions fixed to each other can be adjusted within the length range in the front-rear direction of the connecting slit 734. Thereby, the distance between the first claw portion 712 at the front end portion of the first support portion side member 71 and the second claw portion 722 at the rear end portion of the second support portion side member 72 can be adjusted. 8 (a) and 8 (b) show the support portion spacing holding portion 7 in which the distance between the first claw portion 712 and the second claw portion 722 is large, and FIG. 8 (d) shows the first claw portion 712 and the first claw portion 722. 2 The support portion spacing holding portion 7 having a small spacing from the claw portion 722 is shown.

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

As shown in FIGS. 9 and 10, the formwork spacing holding portion 8 includes a first member 81 and a second member 82. The first member 81 is fixed to the kick-in formwork 5 on the front side of the two kick-in formwork 5 arranged at intervals in the front-rear direction. The second member 82 comes into contact with the kicking formwork 5 on the rear side of the two kicking formwork support portions 6 arranged at intervals in the front-rear direction from the front side.

The first member 81 has an upper plate portion 811, a first side plate portion 812, a second side plate portion 813, and a front plate portion 814. The upper plate portion 811 is formed in a flat plate shape, and is 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 size of the upper plate portion 811 in the width direction is smaller in the front side portion than in the rear side portion. The dimensions of the notch portion 818 in the front-rear direction are set to substantially the same values as the dimensions of the riser form 5 in the front-rear direction. The upper plate portion 811 is formed with a first slit 815 and a second slit 816 that penetrate 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 in the width direction with respect to the second slit 816. The upper plate portion 811 is formed with two openings 817 penetrating the plate surface between the first slit 815 and the second slit 816.

The first side plate portion 812 is formed in a flat plate shape and is arranged so that the plate surface faces the width direction. The first side plate portion 812 projects downward from one edge portion in the width direction behind the cutout portion 818 of the upper plate portion 811. The second side plate portion 813 is formed in a flat plate shape, and is arranged so that the plate surface faces the width direction. The second side plate portion 813 projects downward from the other side edge portion in the width direction behind the cutout portion 818 of the upper plate portion 811. The front plate portion 814 is formed in a flat plate shape, and is arranged so that the plate surface faces the front-rear direction. The front plate portion 814 projects downward from the front edge portion of the upper plate portion 811. The distance between the rear surface of the front plate portion 814 and the front edge portions of the first side plate portion 812 and the second side plate portion 813 is set to the same value as the thickness dimension (dimension in the front-rear direction) of the rise formwork 5. As will be described later, the upper end portion of the rise form 5 is inserted between the rear surface of the front plate portion 814 and the front edge portion of the first side plate portion 812 and the second side plate portion 813, and the front plate portion 814 and the first 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. The structure in which the front plate portion 814, the first side plate portion 812, and the second side plate portion 813 hold the upper end portion of the riser formwork 5 is referred to as a holding portion 85.

The second member 82 has an upper plate portion 821, a first side plate portion 822, and a second side plate portion 823. The upper plate portion 821 is formed in 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 project downward in the width direction from the edge of the 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 in the vicinity of the leading edge portion of the upper plate portion 821, and are arranged at intervals 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 in the width direction with respect to the second female threaded portion 825. In the upper plate portion 821, two openings penetrating the plate surface are spaced apart in the width direction on the other side in the width direction from the first female screw portion 824 and on one side in the width direction from the second female screw portion 825. It is formed.

The first side plate portion 822 is formed in a flat plate shape and is arranged so that the plate surface faces the width direction. The first side plate portion 822 projects downward from one edge portion in the width direction of the upper plate portion 821. The rear side portion of the first side plate portion 822 projects below the front side portion. The second side plate portion 823 is formed in a flat plate shape and is arranged so that the plate surface faces the width direction. The second side plate portion 823 projects downward from the other side edge portion in the width direction of the upper plate portion 821. The rear side portion of the second side plate portion 823 projects below the front side portion. The portion of the first side plate portion 822 and the second side plate portion 823 that projects downward from the rear side portion is referred to as a holding portion projecting piece 84. The trailing edge portions of the first side plate portion 822 and the second side plate portion 823 extend linearly in the vertical direction, respectively, and are formed so that the trailing edge portion of the upper plate portion 821 and the trailing edge portion in the front-rear direction are at the same position. .. The trailing edge portion of the upper plate portion 821, the trailing edge portion of the first side plate portion 822, and the trailing edge portion of the second side plate portion 823 are combined to form the trailing edge portion 83 of the formwork spacing holding portion 8.

The formwork spacing holding portion 8 is arranged 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, and the first side plate portion of the first member 81 is on one side in the width direction of the first side plate portion 822 of the second member 82. The 812 overlaps, and the second side plate portion 813 of the first member 81 overlaps with the other side in the width direction of the second side plate portion 823 of the second member 82.

When the first member 81 and the second member 82 overlap as described above, the first slit 661 of the first member 81 and the first female screw portion 824 of the second member 82 are arranged so as to overlap each other, and the first member 81 The second slit 662 and the second female threaded portion 825 of the second member 82 are arranged so as to overlap each other. By fastening the screw 861 inserted through the first slit 661 from the other side in the width direction to the first female thread portion 824, and by fastening the screw 862 inserted through the third slit 663 from above to the second female thread portion 825. The first member 81 and the second member 82 can be fixed. The first member 81 and the second member 82 are configured so that the positions fixed to each other can be adjusted within the length range of the first slit 661 and the second slit 662. 9 (a) and 9 (b) show the formwork spacing holding portion 8 in which the distance between the front plate portion 814 and the trailing edge portion 83 is large, and FIG. 9 (d) shows the front plate portion 814 and the trailing edge portion 83. The formwork space holding portion 8 having a small space between the two and the formwork is shown. In FIG. 9D, the trailing edge portion of the first member 81 and the trailing edge portion of the second member 82 overlap each other.

In the formwork spacing holding portion 8, the front plate portion 814 is in contact with the front end portion of the formwork upper plate portion 52 of the riser formwork 5 in which the back surface of the front plate portion 814 is located on the front side, and the front plate portion 814 is in contact with the formwork upper plate portion 52. The trailing edge portion 83 is in contact with the front surface of the rise forming plate portion 51 of the rise 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 under the formwork. It is placed on the plate portion 53, and the lower edge portions of the first side plate portion 822 and the second side plate portion 823 come into contact with the upper surface of the formwork lower plate portion 53. In order to attach the formwork space holding portion 8 to the riser formwork 5, the front plate portion 814 is fixed to the formwork upper plate portion 52 located on the front side, and the positions of the first member 81 and the second member 82 in the front-rear direction. The first side plate portion 822 and the second side plate portion 823 are placed on the lower plate portion 53 of the formwork, and the trailing edge portion 83 is located on the rear side of the rise forming plate portion 51 of the formwork 5. The screws 861 and 862 are fastened to the first female threaded portion 824 and the first female threaded portion 824 so as to be pressed against the front surface.

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

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

Subsequently, a support portion spacing holding portion 7 is installed between the rise form support portions 6 adjacent to each other in the front-rear direction. The support portion spacing holding portions 7 are arranged inside the adjacent rise formwork support portions 6 in the width direction (the side where the stairs 2 are constructed) and moved to the outside in the width direction (the side closer to the rise formwork support portion 6). Then, the first claw portion 712 is inserted into the fourth slit 664 of the rise form support portion 6 located on the front side, and the second claw portion 722 is inserted into the second slit 662 of the rise form support portion 6 located on the rear side. insert. At this time, the first support portion side member 71 and the second support portion side member 72 are connected in a loosened state so that the screws 741 and 742 can move relative to the connecting member 73 in the front-rear direction. Then, the positions of the first support portion side member 71 and the second support portion side member 72 are adjusted, and the first claw portion 712 is inserted into the fourth slit 664 of the rise form support portion 6 located on the front side. 2 The claw portion 722 is inserted into the second slit 662 of the rise form support portion 6 located on the rear side. A screw 741 is fastened to the first support portion spacing female screw portion 715, and a screw 742 is fastened to the second support portion spacing female screw portion 725, and the first support portion side member 71 and the second support portion are fastened via the connecting member 73. The side member 72 is fixed. As a result, the distance between the fourth slit 664 of the kick-in formwork support portion 6 located on the front side and the second slit 662 of the kick-in formwork support portion 6 located on the rear side is kept constant, and the kick-in is adjacent to each other in the front-rear direction. The distance between the formwork support portions 6 is kept constant. In the present embodiment, the cutout portion 716 (see FIG. 5) of the support portion spacing holding portion 7 overlaps with the third slit 663 of the rise formwork support portion 6 located on the front side, and the cutout portion 726 (see FIG. 5) is formed. It overlaps with the first slit 661 of the rise form support portion 6 located on the rear side. A screw inserted through the notch 716 and the third slit 663 connects the support portion spacing holding portion 7 and the rise formwork support portion 6 located on the front side, and the screw inserted through the notch 726 and the first slit 661. The support portion spacing holding portion 7 and the rise form support portion 6 located on the rear side are connected to each other.

Subsequently, as shown in FIG. 12, the riser formwork 5 is attached to the riser formwork support portion 6. The widthwise end portion of the riser formwork 5 is inserted into the main body groove portion 63 of the riser formwork support portion 6, and the riser formwork 5 is placed on the main body lower plate portion 614 of the riser formwork support portion 6.

Subsequently, as shown in FIG. 1, a formwork spacing holding portion 8 is installed between the kick-in formwork 5s adjacent to each other in the front-rear direction. First, the first member 81 and the second member 82 of the formwork spacing holding portion 8 are connected in a loosened state so that the first member 81 and the second member 82 can be relatively movable in the front-rear direction. Then, the upper end portion of the rise form 5 is inserted between the rear surface of the front plate portion 814 of the first member 81 and the front edge portion of the first side plate portion 812 and the second side plate portion 813, and the front plate portion 814 and the first portion are inserted. The upper end portion of the riser form 5 is sandwiched between the first side plate portion 812 and the second side plate portion 813. By adjusting the positions of the first member 81 and the second member 82 in the front-rear direction, the holding portion projecting piece 84 of the first side plate portion 822 and the second side plate portion 823 of the second member 82 is placed under the formwork. It is placed on the plate portion 53, and the trailing edge portion 83 of the second member 82 is brought into contact with the front surface of the rise forming plate portion 51 of the rise form 5 located on the rear side. After the position of the second member 82 with respect to the first member 81 is determined, the screws 861 and 862 are fastened to the first female threaded portion 824 and the second female threaded portion 825. As a result, the distance between the formwork upper plate portion 52 of the front side riser formwork 5 and the riser forming plate portion 51 of the rear side riser formwork 5 is kept constant, and the riser formwork 5 adjacent to each other in the rear direction is maintained. The intervals are kept constant.

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

Then, when the concrete is hardened, the staircase formwork 1 is removed. As mentioned above, since the staircase formwork 1 is not buried in concrete, it can be completely removed.

Next, the operation / effect of the staircase formwork 1 according to the above-described embodiment will be described with reference to the drawings.
In the staircase formwork 1 according to the present embodiment, the riser formwork support portion 6 can be supported by a side installation body (building foundation 11, side formwork 3) installed or temporarily installed on the side of the stairs 2. Since the rise form 5 is supported by the rise form support portion 6 supported by the side installation body, it is not necessary to fix the rise form 5 to the side installation body with a fixing tool such as a nail. Since the height position of the riser formwork support portion 6 can be adjusted, the riser formwork 5 can be installed at a desired height. Further, the riser type is installed so as to be located at substantially the same height as the lower end 22a of the riser 22 corresponding to the riser formwork 5 supported by the lower end of the riser form support portion 6 (main body lower plate portion 614). The frame support portion 6 and the rise formwork 5 are not embedded in concrete. This makes it possible to reuse the riser formwork support portion 6 and the riser formwork 5.

Further, in the staircase formwork 1 according to the present embodiment, the riser form support portion 6 has a main body groove portion 63 (concave portion), and the lower end of the main body groove portion 63 has a main body lower plate portion 614 (lower support portion). Is provided. The riser formwork 5 has a side end inserted into the main body groove 63 and is placed on the main body lower plate portion 614. With such a configuration, the riser formwork 5 can be easily installed on the riser formwork support portion 6 without using a fixing tool such as a nail.

Further, in the staircase formwork 1 according to the present embodiment, the riser formwork support portion 6 is a support portion main body 64 that supports the riser formwork 5 and a fixed portion that is connected to the support portion main body 64 and fixed to the side installation body. It has 65 and. The first connecting flange plate portion 626 (first fixing portion) and the second connecting flange plate portion 627 (second fixing portion) of the fixing portion 65 are arranged apart from the side installation body. With such a configuration, when fixing the first connecting flange plate portion 626 and the second connecting flange plate portion 627 to the side installation body, the first connecting flange plate portion 626 and the second connecting flange plate portion are used. It is possible to secure a space for installing a fixing member or the like for fixing each other between the 627 and the side installation body.

Further, in the staircase formwork 1 according to the present embodiment, the lower end of the first connecting flange plate portion 626 on the front side of the support portion main body 64 is the lower end of the riser 22 formed by the riser form 5 supported by the support portion main body 64. It is located above 22a. With such a configuration, the first connecting flange plate portion 626 is not embedded in the concrete of the lower (front side) step portion 21, and the rise form support portion 6 is provided after the concrete of the stairs 2 is hardened. It can be easily removed.

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

Further, the staircase formwork 1 according to the present embodiment has a support portion spacing holding portion 7 (first spacing holding portion) that maintains the spacing between the kicking form support portions 6 adjacent to each other in the front-rear direction to a predetermined dimension. .. With such a configuration, the spacing between the riser formwork support portions 6, that is, the spacing between the riser formwork 5 can be easily managed, and the workability can be improved and the construction quality can be improved.

Further, in the staircase formwork 1 according to the present embodiment, the support portion spacing holding portion 7 inserts the first claw portion 712 into the fourth slit 664 of the rise formwork support portion 6 located on the front side from the width direction, and the second claw portion 712 is inserted from the width direction. The claw portion 722 is configured to be inserted into the second slit 662 of the rise form support portion 6 located on the rear side from the width direction. With such a configuration, even when a force is applied so that the kick-form support portions 6 adjacent to each other in the front-rear direction move relatively in the front-rear direction, the kick-form support portions 6 adjacent to each other in the front-rear direction The interval can be kept constant.

Further, the staircase formwork 1 according to the present embodiment has a formwork space holding portion 8 (second space holding part) that maintains the space between the kick-in formwork 5 adjacent to each other in the front-rear direction to a predetermined dimension. With such a configuration, the spacing between the riser formwork 5 can be easily managed, the workability can be improved, and the construction quality can be improved.

Further, in the staircase formwork 1 according to the present embodiment, the holding portion projecting piece 84 of the formwork spacing holding portion 8 projects from the lower end of the rear rise formwork 5 to the front side, and the formwork lower plate portion 53 (formwork projecting). It is placed on the piece). With such a configuration, it is possible to prevent the holding portion projecting piece 84 from being embedded in concrete. Further, the formwork spacing holding portion 8 can be installed in a stable state.

Further, in the staircase formwork 1 according to the present embodiment, the upper end portion of the riser formwork 5 is located above the upper end portion of the riser 22. Then, in the formwork spacing holding portion 8, the upper end portion of the kick-in formwork 5 is inserted between the rear surface of the front plate portion 814 and the front edge portions of the first side plate portion 812 and the second side plate portion 813, and the front plate portion is formed. The upper end portion of the riser formwork 5 is sandwiched between the 814, the first side plate portion 812, and the second side plate portion 813 (pinching portion 85). With such a configuration, it is possible to prevent the sandwiching portion 85 from being embedded in concrete. Further, the formwork spacing holding portion 8 can be installed in a stable state.

Although the embodiment of the staircase formwork 1 according to the present invention has been described above, the present invention is not limited to the above embodiment and can be appropriately modified without departing from the spirit of the present invention.
For example, the staircase formwork 1 of the above embodiment is a steel formwork, but may be partially made of wood. Further, in the above embodiment, the main body lower plate portion 614 on which the rise form 5 is placed is provided at the lower end of the rise form support portion 6, and the main body lower plate portion 614 has substantially the same height as the lower end 22a of the rise 22. It is placed in the formwork. On the other hand, the riser formwork support portion 6 supports the vertical intermediate portion and the upper portion of the riser formwork 5, and the lower end portion of the riser formwork 5 is located above the lower end portion of the riser formwork 5. You may do it.

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

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

Further, in the above embodiment, the support portion spacing holding portion 7 (first spacing holding portion) for maintaining the spacing between the riser form support portions 6 adjacent to each other in the front-rear direction to a predetermined dimension is provided. On the other hand, the staircase formwork 1 does not have to be provided with the support portion spacing holding portion 7. Further, the support portion spacing holding portion 7 inserts the first claw portion 712 into the fourth slit 664 of the rise form support portion 6 located on the front side from the width direction, and the second claw portion 722 is located on the rear side. Although it is configured to be inserted into the second slit 662 of the formwork support portion 6 from the width direction, the form of the support portion spacing holding portion 7 may be other than the above.

Further, in the above embodiment, the formwork space holding portion 8 (second space holding part) for maintaining the space between the kick-in formwork 5 adjacent to each other in the front-rear direction to a predetermined dimension is provided. On the other hand, it is not necessary to provide the formwork spacing holding portion 8. Further, the formwork spacing holding portion 8 is placed on a formwork lower plate portion 53 (formwork protruding piece) in which the holding portion projecting piece 84 projects forward from the lower end of the rear kick-in formwork 5. However, it does not have to be configured in 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 portion 8 includes a front plate portion 814, a first side plate portion 812, and a second side plate portion 813 (holding portion 85). ) To sandwich the upper end of the riser formwork 5, but it does not have to be configured in this way.

1 Stairs formwork 2 Stairs 5 Kick-up formwork 6 Kick-up formwork Support part 7 Support part Spacing part (1st space holding part)
8 Support part spacing holding part (second spacing holding part)
21 Step 22 Rise 22a Lower end 57 Protruding piece 63 Main body groove (concave)
64 Support part Main body 65 Fixed part 84 Holding part Protruding piece 85 Holding part 614 Main body lower plate part (lower support part)
615 1st main body flange plate part (1st fixed part)
616 2nd main body flange plate part (2nd fixed part)
712 1st claw part 722 2nd claw part

Claims (10)

In the staircase formwork used for the construction of concrete stairs
A kick-in formwork provided along the rise of the stairs,
It has a riser formwork support portion provided on both sides of the riser formwork and supports the riser formwork.
The rise formwork support portion is supported by a side-installed body installed or temporarily installed on the side of the stairs so that the height position can be adjusted.
It is installed so as to be located at either substantially the same height as the lower end of the rise corresponding to the rise form supported by the lower end of the rise form support portion, or at a height above the lower end of the rise. A staircase formwork characterized by that. The rise-in formwork support portion has a concave portion that opens on the side on which the rise-in formwork to be supported is arranged.
A lower support portion is provided at the lower end of the concave portion.
The staircase formwork according to claim 1, wherein the riser formwork has a side end inserted into the concave portion and is placed on the lower support portion. The rise-in form support portion is
A support body having the concave portion and the lower support portion and supporting the rise formwork, and a support portion main body.
It has a fixed portion that is connected to the support portion main body and fixed to the lateral installation body.
The staircase formwork according to claim 2, wherein the fixing portion is arranged apart from the side installation body. The fixing portion includes a first fixing portion connected to the front side of the support portion main body, which is one side in the front-rear direction in which the steps of the stairs are arranged, and which is the side where the lower step portion is located.
It is composed of a second fixing portion connected to the rear side of the support portion main body on the other side in the front-rear direction, which is the side where the upper step portion is located.
The staircase form according to claim 3, wherein the lower end of the first fixing portion is located above the lower end of the rise formed by the rise form supported by the support portion main body. The fixing portion includes a first fixing portion connected to the front side of the support portion main body, which is one side in the front-rear direction in which the steps of the stairs are arranged, and which is the side where the lower step portion is located.
It is composed of a second fixing portion connected to the rear side of the support portion main body on the other side in the front-rear direction, which is the side where the upper step portion is located.
The staircase type according to claim 3 or 4, wherein the lower end of the second fixing portion is located above the upper end of the rise formed by the rise form supported by the support portion main body. frame. One of claims 1 to 5, further comprising a first spacing holding portion that maintains the spacing between the rise-in form support portions adjacent to each other in the front-rear direction in which the steps of the stairs are arranged to a predetermined dimension. The staircase formwork described in the section. The first spacing holding portion is a first claw portion that is inserted into one of the riser formwork support portions adjacent to each other in the front-rear direction from a direction that intersects the front-rear direction, and the first claw portion that is inserted into the other from a direction that intersects the front-rear direction. The staircase form according to claim 6, further comprising a second claw portion to be inserted. The invention according to any one of claims 1 to 7, further comprising a second spacing holding portion that maintains the spacing between the riser formwork adjacent to each other in the front-rear direction in which the steps of the stairs are arranged to a predetermined dimension. The described staircase formwork. The second spacing holding portion has a holding portion projecting piece that projects downward at the rear end portion on which the upper step portion in the front-rear direction is located.
The staircase formwork according to claim 8, wherein the holding portion projecting piece is placed on a formwork projecting piece projecting from the lower end of the riser formwork on the rear side to the front side. The upper end of the riser formwork is located above the upper end of the riser.
8. The staircase formwork according to 9.

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