JP7653682B2 - Formwork fastening fittings, formwork structure, and method for constructing formwork structure - Google Patents

Description

Patent Law Article 30, Paragraph 2 applied February 26, 2021 (tentative name) Construction of new Minaminagasaki dormitory

The present invention relates to formwork fastening fittings, formwork structures, and methods for constructing formwork structures.

In the construction of formwork for pouring concrete, there is a demand for labor-saving and easier construction in the transportation, storage and installation of materials, given the aging of workers and the growing labor shortage. To meet this demand, efforts are being made to improve the formwork fastening hardware used in constructing formwork, and in particular the development of formwork fastening hardware that can be applied to a single horizontal thick end timber, rather than a set of two.

As a conventional formwork fastening fixture, Patent Document 1 discloses a roughly U-shaped formwork fastening fixture with a pair of opposing strips. The formwork fastening fixture described in Patent Document 1 is configured to clamp a single horizontal end member in the U-shaped portion and secure the horizontal end member with a wedge.

Japanese Utility Model Application Publication No. 4-129261

When constructing a formwork using the formwork fastening fittings described in Patent Document 1, after the formwork fastening fittings are fixed to the formwork panels, even if it becomes necessary to correct the orientation of the formwork fastening fittings when fitting the horizontal end members, the orientation of the fittings cannot be corrected without removing the formwork fastening fittings themselves. For this reason, every time the orientation of the formwork fastening fittings needs to be corrected, the fittings must be removed and re-fixed, leaving room for improvement in terms of workability.

The present invention was made in consideration of the above circumstances, and aims to improve workability when constructing formwork using formwork fastening fittings.

The present invention, which solves the above-mentioned problems, is a form fastening fitting for fixing a single horizontal thick end member provided in a formwork structure to a dam plate portion, the form fastening fitting comprising: an axle through portion into which a cone shank portion at a tip end of a separator is screwed; a bottom plate portion having a hole through which the axle through portion is inserted; a nut portion provided at an axial end portion of the axle through portion opposite to the cone shank portion and screwed to the axle through portion inserted into the bottom plate portion; a clamping portion connected to the bottom plate portion for clamping the horizontal thick end member; and a fixing portion connected to the clamping portion for abutting against the horizontal thick end member to fix the horizontal thick end member, the bottom plate portion comprising: The shaft-passing portion is configured to be rotatable relative to the shaft-passing portion with the shaft center as the center of rotation , the clamping portion is composed of a pair of bolts, the fixing portion has a shape extending in the spacing direction of the pair of bolts and has a notch through which a first bolt is inserted and a long hole through which a second bolt is inserted, the notch extends along the spacing direction from an end of the pair of bolts in the spacing direction, the long hole is longitudinal in the spacing direction of the pair of bolts, and a fastening nut and a fixing nut are screwed onto the pair of bolts inserted into the fixing portion .
The present invention from another aspect is a form fastening fitting for fixing one horizontal thick end member provided in a form structure to a sheathing plate portion, the form fastening fitting comprising: an axle through portion into which a cone shank portion at a tip end of a separator is screwed; a bottom plate portion having a hole through which the axle through portion is inserted; a nut portion provided at an axial end portion of the axle through portion on an end opposite to the cone shank portion side, the nut portion being screwed into the axle through portion inserted into the bottom plate portion; a clamping portion connected to the bottom plate portion for clamping the horizontal thick end member; and a fixing portion connected to the clamping portion for abutting against the horizontal thick end member to fix the horizontal thick end member. The bottom plate portion is provided with a nut portion that is provided at an axial end portion of the axle through portion opposite to the cone shank portion side, the nut portion being screwed into the axle through portion inserted into the bottom plate portion. The base plate portion is configured to be rotatable relative to the axial through-portion with the axial center of the through-portion as the center of rotation, the bottom plate portion has a first surface facing the dam plate portion and a second surface on the fixed portion side, the first surface of the bottom plate portion and the clamping portion are composed of a single bent strip plate, the second surface of the bottom plate portion is composed of a flat plate connected to the clamping portion, the fixing portion is a wedge inserted into each of a pair of flat portions of the strip plate that constitutes the clamping portion, the flat plate is located between the pair of flat portions, and the nut portion is located on the fixed portion side of the flat plate.

The clamping portion is configured so that a gap is provided between the horizontal end thick material supported by the clamping portion in the spacing direction of the clamping portion, and a hole in the bottom plate portion may be formed so that the axial center of the shaft through portion passes through the center of gravity of the horizontal end thick material supported by the clamping portion in a cross section parallel to the spacing direction of the clamping portion, including the axial center of the shaft through portion.

The present invention from another perspective is a formwork structure comprising a plurality of adjacent formwork panels each having a dam plate portion and a vertical end thick portion, a separator having a cone shaft portion, a plurality of the above-mentioned formwork fastening fittings, and a horizontal end thick member supported by the clamping portion of the formwork fastening fittings, characterized in that the shaft-through portion of the formwork fastening fittings is screwed into the cone shaft portion inserted into the dam plate portion, and the horizontal end thick member is fixed by abutting against the vertical end thick portion and the fixing portion of the formwork fastening fittings.

The form panel may be provided with a joint member that fits into the ends of two adjacent horizontal thick members in the width direction, and at the installation portion of the joint member, the fixing portion of the form fastening fitting may abut against the joint member.

In another aspect, the present invention is a method for constructing a formwork structure, which comprises connecting adjacent formwork panels each having a dam plate portion and a vertical thick end portion, screwing the cone shaft portion inserted into the dam plate portion into the shaft-through portion of the formwork fastening fitting, fastening the bottom plate portion to the formwork panel by tightening the nut portion of the formwork fastening fitting, inserting a horizontal thick end material into the clamping portion of the formwork fastening fitting, and fixing the horizontal thick end material by abutting the fixing portion of the formwork fastening fitting against the horizontal thick end material.

When the horizontal end members are inserted into the clamping portion of the formwork fastening fitting, a joint member may be fitted to the ends of two adjacent horizontal end members in the width direction of the formwork panel, and the horizontal end members may be fixed by abutting the fixing portion against the joint member at the installation portion of the joint member.

The present invention can improve workability when constructing formwork using formwork fastening fittings.

FIG. 1 is an explanatory diagram showing a schematic configuration of a formwork structure according to an embodiment of the present invention. 1 is an explanatory diagram showing a schematic configuration of a formwork fastening fitting according to a first embodiment. FIG. FIG. 3 is a bottom view of the formwork fastening fitting of FIG. 2 . FIG. 3 is a side view of the formwork fastening fitting of FIG. 2. 1 is an explanatory diagram showing the general configuration of a formwork fastening fitting at the installation portion of a joint material. FIG. FIG. 11 is an explanatory diagram showing a method of constructing a formwork structure using formwork fastening fittings. FIG. 11 is an explanatory diagram showing the schematic configuration of a formwork fastening fitting according to a second embodiment. FIG. 8 is a bottom view of the formwork fastening fitting of FIG. 7 . FIG. 8 is a side view of the formwork fastening fitting of FIG. 7. FIG. 11 is an explanatory diagram showing a method of constructing a formwork structure using formwork fastening fittings. FIG. 13 is an explanatory diagram showing an example of the configuration of a formwork fastening fitting. FIG. 13 is an explanatory diagram showing the schematic configuration of a formwork fastening fitting according to a third embodiment. FIG. 13 is a bottom view of the formwork fastening fitting of FIG. 12 . FIG. 13 is a side view of the formwork fastening fitting of FIG. 12. FIG. 11 is an explanatory diagram showing a method of constructing a formwork structure using formwork fastening fittings.

Embodiments of the present invention will be described below with reference to the drawings. Note that in this specification and the drawings, elements having substantially the same functional configuration are designated by the same reference numerals to avoid redundant description.

Figure 1 is an explanatory diagram showing the schematic configuration of a formwork structure according to an embodiment of the present invention, and is an elevational view of the formwork structure as seen from the side opposite to the side where concrete is poured.

The formwork structure 1 comprises a formwork panel 10, a horizontal end member 11, and a formwork fastening fitting 20.

The form panels 10 are arranged along the width direction (X direction) of the form structure 1, and the form panels 10 are connected by butting their widthwise ends together. The form panels 10 have a dam board portion 12 and a vertical thick end portion 13, and in this embodiment, a vertical thick end material is attached to the dam board portion 12 as the vertical thick end portion 13. The dam board portion 12 may be made of a material such as plywood, plywood, or a resin board. The dam board portion 12 and the vertical thick end portion 13 do not have to be separate materials, and the form panel 10 may be, for example, a resin panel in which the dam board portion 12 and the vertical thick end portion 13 are integrally molded.

The horizontal thick end members 11 are arranged at intervals in the height direction (Z direction) of the form panel 10, and each horizontal thick end member 11 is fixed to the form panel 10 by form fastening fittings 20 arranged at intervals in the width direction (X direction) of the form panel 10. For example, aluminum semi-cylindrical members are used as the horizontal thick end members 11, but as long as it is confirmed that the horizontal thick end members 11 have the strength to withstand the lateral pressure during concrete pouring, commonly used round pipes, square pipes, thick corners, etc. may also be used, and the material is not limited to aluminum.

A plurality of horizontal end members 11 are also arranged in the width direction (X direction) of the formwork panel 10, and adjacent horizontal end members 11 are connected by joint members 14 with their axial ends butted against each other. The joint members 14 have a shape that can be fitted into the horizontal end members 11, and extend along the width direction of the formwork panel 10. The joint members 14 are fixed to the formwork panel 10 by formwork fastening fittings 20. The length of the joint members 14 in the width direction (X direction) is longer than the center distance between two adjacent formwork fastening fittings 20 in the width direction, and the joint members 14 are arranged to straddle the two formwork fastening fittings 20. The joint members 14 may be shorter than the center distance between two adjacent formwork fastening fittings 20 in the width direction (X direction), and may be fixed by only one formwork fastening fitting.

The formwork fastening fittings 20 according to the first to third embodiments will be described below. Note that, when describing the components of the formwork fastening fittings 20, the terms "above" and "below" may be used, but these terms refer to "above" and "below" relative to the state in which the formwork fastening fittings 20 are fixed to the formwork panel 10.

First Embodiment
Fig. 2 is an explanatory diagram showing a schematic configuration of the formwork fastening fitting 20 according to the first embodiment, and is a diagram showing a vertical cross section of the formwork fastening fitting 20 as viewed from the width direction (X direction) of the formwork structure 1. Fig. 3 is a bottom view of the formwork fastening fitting 20 in Fig. 2. Fig. 4 is a side view of the formwork fastening fitting 20 in Fig. 2, and is a diagram showing the formwork fastening fitting 20 as viewed from the direction of the arrow W in Fig. 2.

As shown in Figures 2 to 4, the formwork fastening bracket 20 has an axle passage portion 30, a bottom plate portion 40, a nut portion 50, a clamping portion 60, and a fixing portion 70.

The shaft-through portion 30 is the portion into which the shaft portion 15a of the cone 15 at the tip of the separator attached to the dam plate portion 12 is screwed. The shaft-through portion 30 is made of a part having, for example, one end in the axial direction (Y direction) machined to a female thread and the other end machined to a male thread.

The bottom plate portion 40 is a portion to which the shaft-passing portion 30 is fixed. In this embodiment, the bottom plate portion 40 is formed of a member that has a U-shaped horizontal cross section (a cross section perpendicular to the spacing direction of the clamping portion 60) and extends in the height direction (Z direction) of the formwork panel 10. The bottom plate portion 40 has a first surface 41 located on the side facing the dam plate portion 12 and a second surface 42 located on the side facing the fixing portion 70 described below. The distance between the first surface 41 and the second surface 42 is greater than the plate thickness of the member that constitutes the bottom plate portion 40 (the plate thickness of the U-shaped member in this embodiment). The second surface 42 of the bottom plate portion 40 has a hole 43 formed therein through which the male-threaded portion of the shaft-passing portion 30 is inserted.

The bottom plate portion 40 may be formed with a square cross section, for example, like a rectangular tube member. In the case of a bottom plate portion with a square cross section, however, holes through which the shaft-passing portion 30 is inserted must be formed on both the first surface 41 and the second surface 42. In addition, in order to insert the shaft-passing portion 30, the holes must be formed with different diameters, which increases the amount of work required for processing. For this reason, it is preferable that the bottom plate portion 40 has a U-shaped horizontal cross section, as in this embodiment.

The nut portion 50 is a portion that is screwed into the shaft-through portion 30 that is inserted into the hole 43 of the bottom plate portion 40. The end of the shaft-through portion 30 on the male thread side passes through the hole 43 of the bottom plate portion 40 and protrudes from the second surface 42, and the nut portion 50 is screwed into the protruding portion. This fixes the shaft-through portion 30 to the bottom plate portion 40.

If the shaft-through portion 30 protrudes toward the horizontal thick material 11 side beyond the vertical thick material portion 13, when the horizontal thick material 11 is fixed to the formwork panel 10, the tip of the shaft-through portion 30 and the horizontal thick material 11 will interfere with each other, making the fixing posture of the horizontal thick material 11 unstable. For this reason, the shaft-through portion 30 and the bottom plate portion 40 are appropriately set so that the length from the first surface 41 of the bottom plate portion 40 to the tip of the shaft-through portion 30 is a length that does not protrude beyond the vertical thick material portion 13.

The clamping portion 60 is a portion that supports the horizontal end thick material 11 by clamping it from above and below. In this embodiment, the clamping portion 60 is composed of a pair of bolts 61, 62. One end of each bolt 61, 62 is connected to the second surface 42 of the bottom plate portion 40, for example by welding, and a fixing portion 70, which will be described later, is fixed to the other end of each bolt 61, 62. The shaft passage portion 30 and the nut portion 50 are located between the pair of bolts 61, 62 in the height direction (Z direction) of the form panel 10.

The bolts 61, 62 used in this embodiment may not be male-threaded over their entire length, and may be male-threaded only at the end on the side of the fixing part 70 described later. In addition, when one end of each bolt 61, 62 is welded to the bottom plate part 40, it is preferable that the other end of each bolt 61, 62 (the end opposite the bottom plate part 40 side) has the threads crushed with the fixing part 70, fastening nut 75, and fixing nut 76 described later attached. This prevents the fixing part 70 and fastening nut 75 described later from coming off each bolt 61, 62. Therefore, the bottom plate part 40, the clamping part 60, and the fixing part 70 are integrated, and the components are configured not to easily separate, so that the components of the formwork fastening fitting 20 are less likely to fall or get lost during construction, improving workability and safety.

The spacing of the clamping portion 60 must be set so that the horizontal end thick material 11 and the joint material 14 can be inserted in the state shown in FIG. 6(a). As shown in FIG. 2, a gap is created between the upper first bolt 61 of the pair of bolts 61, 62 and the upper surface of the horizontal end thick material 11 supported by the lower second bolt 62. In other words, the spacing of the clamping portion 60 is longer than the length of the horizontal end thick material 11 in the Z direction. By providing such a spacing, even if the Z-directional positions of adjacent cones 15 in the X direction are shifted slightly due to construction errors, the horizontal end thick material 11 can be smoothly inserted into the clamping portion 60, which improves workability.

In addition, the hole 43 of the bottom plate portion 40 is preferably formed so that the axial center A passes through the center of gravity G of the horizontal end thick material 11 supported by the clamping portion 60 (more specifically, placed and supported on the second bolt 62 located below) in a cross section parallel to the spacing direction (Z direction) of the clamping portion 60 including the axial center A of the shaft-passing portion 30 as shown in FIG. 2. In this embodiment, the axial center A of the shaft-passing portion 30 does not coincide with the center line C of the spacing between the pair of bolts 61, 62, and is designed with the intention that the axial center A is located between the center line C and the second bolt 62. With this configuration, even if a gap is provided between the clamping portion 60 and the horizontal end member 11 (more specifically, a gap is provided between the upper surface of the horizontal end member 11 supported by the first bolt 61 located on the upper side and the second bolt 62 located on the lower side), the axis center A and the center of gravity G of the horizontal end member 11 can be approximately aligned to firmly fix the horizontal end member 11, thereby improving the strength of the formwork structure 1. This effect can also be obtained in the second embodiment described below.

The fixing portion 70 is a portion that fixes the horizontal thick end material 11 supported by the clamping portion 60 by abutting it against the vertical thick end portion 13. In this embodiment, the fixing portion 70, like the bottom plate portion 40, is U-shaped in horizontal cross section (cross section perpendicular to the spacing direction of the clamping portion 60) and is composed of a member that extends in the spacing direction (Z direction) of the clamping portion 60. Note that the fixing portion 70 may be formed, for example, in a U-shaped horizontal cross section, but is preferably formed in a U-shape for the same reasons as the bottom plate portion 40 described above.

The bottom surface 70a of the U-shaped part constituting the fixing part 70 has a first surface 71 located on the bottom plate part 40 side and a second surface 72 located on the opposite side to the bottom plate part 40 side. In this embodiment, the bottom surface 70a side of the U-shaped part is located on the side of the horizontal thick end material 11, and the opening 70b side of the U-shaped part is located on the opposite side to the horizontal thick end material 11 side. Therefore, when fixing the horizontal thick end material 11 with the fixing part 70, the fixing part 70 abuts against the horizontal thick end material 11 with a surface, so that the horizontal thick end material 11 can be fixed more firmly. In addition, damage to the surface of the horizontal thick end material can be suppressed. The U-shaped part that constitutes the fixing part 70 may have, for example, the opening 70b side located on the side of the horizontal thick material 11 and the bottom surface 70a side located on the opposite side to the horizontal thick material 11 side, but from the viewpoint of obtaining the above-mentioned effect, it is preferable that the bottom surface 70a side of the U-shaped part be located on the side of the horizontal thick material 11 as in this embodiment.

As shown in FIG. 4, in this embodiment, a notch 73 and a long hole 74 are formed in the bottom surface 70a of the U-shaped part that constitutes the fixing part 70.

The notch 73 extends from the end (upper end in FIG. 4) in the spacing direction (Z direction) of the pair of bolts 61, 62 along the spacing direction. The size of this notch 73 allows the first bolt 61 to fit into it.

The long hole 74 extends in the spacing direction (Z direction) between the pair of bolts 61, 62, and the longitudinal direction of the long hole 74 faces the spacing direction. The long hole 74 is sized to allow the second bolt 62 to be inserted therethrough.

A fastening nut 75 and a fixing nut 76 are arranged on the second surface 72 of the bottom surface portion 70a constituting the fixing portion 70, and the fastening nut 75 is attached to the first bolt 61 inserted into the notch 73, and the fixing nut 76 is welded to the second bolt 62 inserted into the long hole 74.

The fixing part 70 extends in the spacing direction (Z direction) between the pair of bolts 61, 62, and it is preferable that the shortest distance D from the end of the fixing part 70 on the notch 73 side to the long hole 74 is shorter than the inner dimension L (Fig. 2) of the pair of bolts 61, 62. This allows the first bolt 61 to be fitted into the notch 73 simply by rotating and then lifting the fixing part 70 through which the second bolt 62 has been inserted. In addition, when dismantling the formwork, the first bolt 61 is disengaged from the notch 73 by simply loosening the fastening nut 75 of the first bolt 61 due to the weight of the fixing part 70, making dismantling easier.

In this embodiment, a notch 73 is formed at the upper end of the fixing portion 70, and a long hole 74 is formed below the notch 73. However, a notch (not shown) into which the second bolt 62 fits may be formed at the lower end of the fixing portion 70, and a long hole (not shown) into which the first bolt 61 is inserted may be formed above the notch 73.

The formwork fastening fitting 20 in the first embodiment is configured as described above. According to the formwork structure 1 using such a formwork fastening fitting 20, the axle-through portion 30 into which the cone axle portion 15a is screwed is fixed to the bottom plate portion 40 by the nut portion 50 arranged on the second surface 42 of the bottom plate portion 40. With such a formwork fastening fitting 20, the bottom plate portion 40 can rotate relative to the axle-through portion 30 by loosening the fastening of the nut portion 50. Therefore, even after the formwork fastening fitting 20 is fixed to the formwork panel 10, the orientation of the formwork fastening fitting 20 can be easily corrected, improving workability during formwork construction.

The formwork fastening fitting 20 shown in FIG. 2 is a fitting used in the non-installed portion of the joint material 14 shown in FIG. 1, but as shown in FIG. 5, the fitting used in the installation portion of the joint material 14 has the same configuration. In the example shown in FIG. 5, the joint material 14, whose small end cross section is U-shaped to match the outer shape of the horizontal end thick material 11, is fitted to the horizontal end thick material 11 from the horizontal direction along the axial direction (Y direction) of the shaft passage portion 30. When fitting the joint material 14 from the horizontal direction in this way, the horizontal end thick material 11 can be temporarily placed on the second bolt 62 and then covered with the joint material 14, which makes it easy to work. In addition, the connection form of the horizontal end thick material 11 by the joint material 14 is not limited to the form of covering the joint material 14 from the horizontal direction, and may be a form in which the joint material is covered from above the horizontal end thick material 11 or a form in which the joint material is inserted into the inside of the hollow horizontal end thick material 11.

Next, we will explain how to construct the formwork structure 1 using the formwork fastening fittings 20 in the first embodiment.

First, multiple form panels 10 each having a dam plate portion 12 and a thick vertical end portion 13 are connected so that they are adjacent to each other. Next, a cone 15 of a separator (not shown) is placed on the surface of the dam plate portion 12 on the side where concrete is poured, and the cone shaft portion 15a is inserted into the dam plate portion 12.

Then, as shown in FIG. 6(a), the cone shaft portion 15a protruding from the rear side of the dam plate portion 12 is screwed into one end of the shaft passage portion 30.

Next, as shown in FIG. 6(b), one horizontal end thick material 11 is inserted between a pair of bolts 61, 62, and the horizontal end thick material 11 is temporarily placed on the second bolt 62. If a joint material 14 is to be installed, the joint material 14 is fitted to the horizontal end thick material 11 at this stage.

Next, as shown in FIG. 6(c), the fixing part 70 is rotated around the second bolt 62 as the center of rotation, and the notch 73 of the fixing part 70 is positioned below the first bolt 61 as shown in FIG. 6(d).

Then, as shown in FIG. 6(e), the fixing part 70 is lifted up, the first bolt 61 is fitted into the notch 73, and each fastening nut 75 is tightened. As a result, the fixing part 70 is pressed against the horizontal end thick material 11, and the horizontal end thick material 11 is fixed in abutment against the vertical end thick material 13.

The formwork structure 1 in the first embodiment is constructed as described above.

Second Embodiment
Fig. 7 is an explanatory diagram showing a schematic configuration of a form fastening fitting 20 according to a second embodiment, as viewed from the width direction (X direction) of the formwork structure 1. Fig. 8 is a bottom view of the form fastening fitting 20 in Fig. 7. Fig. 9 is a side view of the form fastening fitting 20 in Fig. 7, as viewed from the direction of the arrow W in Fig. 7.

The bottom plate portion 40 is composed of a single strip 44 in which the first surface 41 and the clamping portion 60 are bent, and the strip 44 is formed in a U-shape when viewed from the width direction (X direction). The first surface 41 of the bottom plate portion 40 is formed with a hole (not shown) through which the shaft passage portion 30 is inserted. The second surface 42 of the bottom plate portion 40 is composed of a flat plate 45 that is a separate member from the strip 44, and the flat plate 45 is fixed to the strip 44 by, for example, welding. The shaft passage portion 30 passes between the first surface 41 and the second surface 42 of the bottom plate portion 40, and is fixed to the second surface 42 by a nut portion 50, as in the first embodiment.

The clamping portion 60 is composed of a pair of flat surfaces (a first flat surface 63 and a second flat surface 64). Each flat surface 63, 64 has a through hole 65 that is L-shaped when viewed from the distance direction (Z direction) between the flat surfaces 63, 64.

The fixing portion 70 is composed of a wedge 77. This wedge 77 is inserted into each of the through holes 65 of the pair of flat portions 63, 64. This fixes the horizontal end member 11 in contact with the vertical end member.

The long side of the L-shaped through hole 65 is formed with a width in the X direction that is approximately the same as the long side of the wedge 77, but the short side is formed as a loose hole with a width in the Y direction that is wider than the short side of the wedge 77. This allows the position of the wedge 77 to be moved appropriately even when a joint material 14 is provided on the vertical end thick parts 13 and horizontal end thick members 11 of multiple sizes used in the formwork structure 1, or on the horizontal end thick members 11 supported by the clamping part 60, and allows the short side of the wedge 77 to be more reliably abutted against the horizontal end thick members 11 or the joint material 14.

The fixing part 70 and the clamping part 60 are preferably connected by a connector 66 such as a chain or wire. In this embodiment, one end of the connector 66 is attached to the upper end of the wedge 77, and the other end of the connector 66 is attached to the first flat part 63. By connecting the fixing part 70 and the clamping part 60 in this manner, components of the formwork fastening fitting 20 are less likely to fall or get lost during construction, improving workability and safety.

Even in the formwork fastening fitting 20 according to the second embodiment configured as described above, the bottom plate portion 40 can rotate relative to the shaft passage portion 30, so that the orientation of the formwork fastening fitting 20 can be easily corrected even after the formwork fastening fitting 20 has been fixed to the formwork panel 10, improving workability during construction of the formwork.

In addition, according to the formwork fastening fitting 20 of the second embodiment, the first surface 41 of the bottom plate portion 40 and the clamping portion 60 are integrated, and the fixing portion 70 is constructed from a single part such as the wedge 77, so the number of parts can be reduced compared to the formwork fastening fitting 20 of the first embodiment.

When constructing a formwork structure 1 using the formwork fastening fittings 20 in the second embodiment, first, as shown in FIG. 10(a), the axle-through portion 30 to which the cone axle portion 15a is screwed is fixed to the bottom plate portion 40. Next, as shown in FIG. 10(b), one horizontal end thick member 11 is inserted between the pair of flat portions 63, 64. After that, as shown in FIG. 10(c), a wedge 77 as a fixing portion 70 is inserted into each of the pair of flat portions 63, 64. This causes the horizontal end thick member 11 to be fixed in contact with the vertical end thick member.

The above describes the form fastening fitting 20 according to the second embodiment, but the form fastening fitting 20 may be configured to combine the first and second embodiments, for example, as shown in FIG. 11. In this configuration example, as shown in FIG. 11(a), a pair of bolts 61, 62 are welded to a pair of flat portions 63, 64. Also, as shown in FIG. 11(b), the notch 73 of the fixing portion 70 is formed on the side of the fixing portion 70, and the fixing portion 70 is fitted to the first bolt 61 by rotating the fixing portion 70 around the second bolt 62 as the center of rotation.

Third Embodiment
Fig. 12 is an explanatory diagram showing a schematic configuration of a form fastening fitting 20 according to a third embodiment, as viewed from the width direction (X direction) of the formwork structure 1. Fig. 13 is a bottom view of the form fastening fitting 20 in Fig. 12. Fig. 14 is a side view of the form fastening fitting 20 in Fig. 12, as viewed from the direction of arrow W in Fig. 12. Note that Fig. 14 only shows the structure in the vicinity of the fixing portion 70.

The formwork fastening fitting 20 in this embodiment is a component in which the bottom plate portion 40, the clamping portion 60, and the fixing portion 70 are configured in a U-shape when viewed from the width direction (X direction) of the formwork panel 10. The shaft-passing portion 30 is inserted into the bottom plate portion 40 and fixed by the nut portion 50, as in the previous embodiment. The clamping portion 60 is configured from a pair of straight portions (a first straight portion 67 and a second straight portion 68).

The fixing portion 70 has a first fixing portion 78 that is integrated with the first straight portion 67, and a second fixing portion 79 that is integrated with the second straight portion 68. The first fixing portion 78 has an inclined portion 78a that connects to the first straight portion 67, and a tip portion 78b that extends from the inclined portion 78a in the axial direction (Y direction) of the shaft-passing portion 30. Similarly, the second fixing portion 79 has an inclined portion 79a that connects to the second straight portion 68, and a tip portion 79b that extends from the inclined portion 79a in the axial direction of the shaft-passing portion 30. The inclined portions 78a, 79a are inclined in a direction that approaches each other toward the tip portions 78b, 79b. In other words, the inclined portions 78a, 79a are inclined in a direction that narrows the gap between the clamping portions 60.

As shown in FIG. 13, the formwork fastening fitting 20 is U-shaped when viewed from below, and the clamping part 60 and the fixing part 70 have a pair of opposing side surfaces 80. At the tip parts 78b and 79b of each fixing part 70, a bolt 81 is inserted between the pair of side surfaces 80, and these bolts 81 are connected to a bolt receiving member 82. A fastening bolt 83 arranged on the upper surface of the tip part of the first fixing part 78 is connected to this bolt receiving member 82. When the fastening bolt 83 is tightened, the first fixing part 78 approaches the second fixing part 79, and when the fastening bolt 83 is loosened, the first fixing part 78 moves away from the second fixing part 79. In this embodiment, the first fixing part 78 and the second fixing part 79 are brought close to each other using the fastening bolt 83, but the mechanism for bringing the fixing parts 78 and 79 close to each other is not particularly limited.

Since the fastening bolt 83 is connected to the bolt receiving material 82, when the fastening bolt 83 is loosened and is no longer in contact with the upper surface of the tip of the first fixing part 78, the fastening bolt 83 becomes rotatable around the bolt 81 provided at the tip 79b of the second fixing part 79. With this configuration, the fastening bolt 83 does not come off the formwork fastening fitting 20, so that components of the formwork fastening fitting 20 are less likely to fall off or get lost during construction, improving workability and safety.

Even in the formwork fastening fitting 20 according to the third embodiment configured as described above, the bottom plate portion 40 can rotate relative to the shaft passage portion 30, so that the orientation of the formwork fastening fitting 20 can be easily corrected even after the formwork fastening fitting 20 has been fixed to the formwork panel 10, improving workability during construction of the formwork.

When constructing the formwork structure 1 using the formwork fastening fitting 20 in the third embodiment, first, as shown in FIG. 15(a), the first straight portion 67 and the first fixing portion 78 are rotated upward to fix the axle through portion 30 to which the cone axle portion 15a is screwed to the bottom plate portion 40. Next, as shown in FIG. 15(b), the first straight portion 67 and the first fixing portion 78 are rotated upward to fit one horizontal end thick material 11 into the opening formed between the straight portions 67, 68. Next, as shown in FIG. 15(c), the first straight portion 67 and the first fixing portion 78 are rotated downward. Next, the fastening bolt 83 is rotated upward, and then, as shown in FIG. 15(d), the fastening bolt 83 is tightened to narrow the gap between the first fixing portion 78 and the second fixing portion 79. As a result, the inclined portions 78a, 79a of each fixing portion 78, 79 press against the horizontal end thick material 11, and the horizontal end thick material 11 is fixed in contact with the vertical end thick portion 13.

Although one embodiment of the present invention has been described above, the present invention is not limited to such an example. It is clear that a person skilled in the art can come up with various modified or revised examples within the scope of the technical ideas described in the claims, and it is understood that these also naturally fall within the technical scope of the present invention.

The present invention can be applied to formwork structures for pouring concrete.

1 Formwork structure 10 Formwork panel 11 Horizontal thick end material 12 Weir plate portion 13 Vertical thick end portion 14 Joint material 15 Cone 15a Cone shaft portion 20 Formwork fastening fitting 30 Shaft through portion 40 Bottom plate portion 41 First surface 42 Second surface 43 Hole 44 Band plate 45 Flat plate 50 Nut portion 60 Clamping portion 61 First bolt 62 Second bolt 63 First flat portion 64 Second flat portion 65 Through hole 66 Connector 67 First straight portion 68 Second straight portion 70 Fixing portion 70a Bottom surface portion 70b Opening 71 First surface 72 Second surface 73 Notch 74 Long hole 75 Fastening nut 76 Fixing nut 77 Wedge 78 First fixing portion 78a Inclined portion 78b Tip portion 79 Second fixing portion 79a Inclined portion 79b Tip portion 80 Side surface 81 Bolt 82 Bolt receiving member 83 Fastening bolt A Shaft center C Center line of the interval between clamping portions G Center of gravity of horizontal end thick material

Claims (7)

A formwork fastening fitting for fixing a single horizontal end member provided in a formwork structure to a dam plate portion,
a shaft-passing portion into which a cone shaft portion at a tip end of the separator is screwed;
a bottom plate portion having a hole through which the shaft through-hole is inserted;
a nut portion provided at an axial end of the shaft-passing portion opposite to the cone stem portion and screwed into the shaft-passing portion inserted into the bottom plate portion;
A clamping portion connected to the bottom plate portion and clamping the horizontal thick end material;
A fixing portion connected to the clamping portion and abutting against the horizontal thick material to fix the horizontal thick material,
The bottom plate portion is configured to be rotatable relative to the shaft through-portion around an axis center of the shaft through-portion ,
The clamping portion is composed of a pair of bolts,
The fixing portion has a shape extending in a spacing direction between the pair of bolts, and has a notch through which the first bolt is inserted and an elongated hole through which the second bolt is inserted,
the notches extend along the spacing direction from ends of the pair of bolts in the spacing direction,
The long hole has a longitudinal direction that corresponds to a distance direction between the pair of bolts,
A formwork fastening fitting, characterized in that a fastening nut and a fixing nut are screwed onto the pair of bolts inserted into the fixing portion . A formwork fastening fitting for fixing a single horizontal end member provided in a formwork structure to a dam plate portion,
a shaft-passing portion into which a cone shaft portion at a tip end of the separator is screwed;
a bottom plate portion having a hole through which the shaft through-hole is inserted;
a nut portion provided at an axial end of the shaft-passing portion opposite to the cone stem portion and screwed into the shaft-passing portion inserted into the bottom plate portion;
A clamping portion connected to the bottom plate portion and clamping the horizontal end thick material;
A fixing portion connected to the clamping portion and abutting against the horizontal thick material to fix the horizontal thick material,
The bottom plate portion is configured to be rotatable relative to the shaft through-portion around an axis center of the shaft through-portion,
The bottom plate portion has a first surface facing the dam plate portion and a second surface facing the fixing portion,
The first surface of the bottom plate portion and the clamping portion are formed of a single strip plate that is bent,
The second surface of the bottom plate portion is formed of a flat plate connected to the clamping portion,
the fixing portion is a wedge inserted into each of a pair of flat portions of the band plate constituting the clamping portion,
The flat plate is located between the pair of planar portions,
A formwork fastening fitting, characterized in that the nut portion is located closer to the fixed portion than the flat plate. The clamping portion is configured such that a gap is provided between the clamping portion and the horizontal end thick material supported by the clamping portion in the spacing direction of the clamping portion,
3. A formwork fastening fitting as described in claim 1 or 2, characterized in that in a cross section parallel to the spacing direction of the clamping portions and including the axial center of the axle-passing portion, a hole in the bottom plate portion is formed so that the axial center of the axle-passing portion passes through the center of gravity of the horizontal end thick material supported by the clamping portions . A formwork structure,
A plurality of adjacent form panels each having a dam plate portion and a vertical thick end portion;
A separator having a cone stem portion;
A plurality of formwork fastening fittings according to any one of claims 1 to 3 ;
A horizontal end member supported by the clamping portion of the formwork fastening fitting;
The shaft-through portion of the formwork fastening fitting is screwed into the cone shaft portion inserted into the dam plate portion,
A formwork structure, characterized in that the horizontal end thick member is fixed in contact with the vertical end thick portion and the fixing portion of the formwork fastening fitting. A joint member is provided to fit into the ends of the two adjacent horizontal end members in the width direction of the form panel,
The formwork structure according to claim 4 , characterized in that, at the installation portion of the joint material, the fixing portion of the formwork fastening fitting abuts against the joint material. A method for constructing a formwork structure, comprising the steps of:
A plurality of adjacent form panels each having a dam plate portion and a vertical thick end portion are connected to each other,
The cone shaft portion inserted into the dam plate portion is screwed into the shaft-passing portion of the formwork fastening fitting according to any one of claims 1 to 3 ,
The bottom plate portion is fixed to the form panel by tightening the nut portion of the form fastening fitting;
A horizontal end thick member is inserted into the clamping portion of the formwork fastening fitting,
A method for constructing a formwork structure, characterized in that the horizontal end members are fixed by abutting the fixing portions of the formwork fastening fittings against the horizontal end members. When the horizontal end thick material is inserted into the clamping portion of the formwork fastening fitting, a joint material is fitted to the ends of the two horizontal end thick materials adjacent to each other in the width direction of the formwork panel,
7. A method for constructing a formwork structure as described in claim 6 , characterized in that, at the installation portion of the joint material, the fixing portion is abutted against the joint material to fix the horizontal end thick member.

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