Formwork fastening hardware

Abstract

When fixing end timbers to the formwork using formwork fastening fittings, the tilting and rotation of the end timber retaining fittings are suppressed, reducing the time and labor required for formwork construction. [Solution] The shaft member 11 has a female threaded portion 11a1 at its tip that screws into the male threaded portion of the shaft leg material, and a male threaded portion 11c on its outer surface. The end beam retaining bracket 12 has a first shaft member through hole 12a1 in its back plate portion 12a through which the shaft member 11 passes, and end beam contact portions 12b1, 12b1 that abut against the horizontal end beams 2f, 2f and press against the weir plate 2a. The fastening nut 13 screws into the male threaded portion 11c of the shaft member 11. The end beam retaining bracket 12 has a plate 12c on the opposite side of the back plate portion 12a of its pair of side plate portions 12b, 12b, facing the back plate portion 12a with a gap between them. The plate 12c has a second shaft member through hole 12c1 through which the shaft member 11, which has passed through the first shaft member through hole 12a1, passes.

Description

Technical Field

[0005]

[0001] The present invention relates to a formwork fastening fitting for fastening a formwork for concrete placement.

Background Art

[0002] Generally, a formwork used for concrete placement is constructed by supporting a pair of retaining plates separated by the thickness of the wall by a separator with end timbers such as vertical end timbers (lumber) and horizontal end timbers, and fixing them with formwork fastening fittings (see, for example, Patent Document 1). In the formwork fastening fitting disclosed in Patent Document 1, a spring washer is provided on the shaft member between the end timber pressing fitting and the fastening nut to prevent the fastening nut from loosening due to the vibration of the vibrator and falling off from the end of the shaft member of the formwork fastening fitting.

Prior Art Documents

Patent Documents

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, in the actual formwork construction site, since a large number of formwork fastening fittings are used at predetermined intervals to fasten the formwork, if the end timber pressing fitting for pressing the horizontal end timber tilts or rotates, it is necessary to correct the inclination and rotation of the end timber pressing fitting for each of the many formwork fastening fittings and install them, which causes a problem that the formwork construction work is time-consuming. In particular, in a general formwork fastening fitting, since only one shaft member through-hole is provided in the end timber pressing fitting, when the outer diameter of the shaft member is smaller than the inner diameter of the shaft member through-hole, the end timber pressing fitting tends to tilt or rotate with respect to the shaft member.

[0005] In recent years, there is a shortage of on-site workers, and it is required to reduce the labor and time required for formwork construction work.

[0006] Therefore, the present invention has been made in view of these problems, and aims to provide a formwork fastening fitting that can fix end timbers to formwork by suppressing the tilting and rotation of the end timber retaining fitting when fixing end timbers to formwork using formwork fastening fittings, thereby reducing the time and labor required for formwork construction work. [Means for solving the problem]

[0007] To solve the above problems, the formwork fastening fitting according to the present invention is a formwork fastening fitting for fixing end timbers to a formwork board, and is characterized by comprising: a shaft member having a female screw portion at its tip that screws into the male screw portion of a shaft leg member and a male screw portion on its outer surface; an end timber retaining fitting having an end timber contact portion that abuts against the end timber, and having a plurality of shaft member through holes provided at intervals for the shaft member to pass through; and a fastening nut that screws into the male screw portion of the shaft member protruding from the opposite side of the end timber retaining fitting through the plurality of shaft member through holes. Furthermore, in the formwork fastening fitting according to the present invention, the end member retaining fitting has, as the plurality of through holes for the shaft members, a first shaft member through hole on the fastening nut side and a second shaft member through hole on the female screw portion side of the shaft member, and the diameter of the second shaft member through hole is smaller than the diameter of the first shaft member through hole. Furthermore, the formwork fastening fitting according to the present invention is characterized in that the end timber retaining fitting has, as the plurality of shaft member through holes, a first shaft member through hole on the fastening nut side and a second shaft member through hole on the female screw portion side of the shaft member, the first shaft member through hole is provided at a position shifted to one side from the midpoint of the longitudinal direction of the end timber retaining fitting, while the second shaft member through hole is provided at a position shifted to the other side from the midpoint of the longitudinal direction of the end timber retaining fitting, and the first shaft member through hole and the second shaft member through hole are formed to overlap by more than the outer diameter of the shaft member in a direction perpendicular to the longitudinal direction of the end timber retaining fitting, and the shaft member is configured to pass through the overlapping portion of the first shaft member through hole and the second shaft member through hole. Furthermore, the formwork fastening fitting according to the present invention is characterized in that the end timber retaining fitting comprises a back plate portion provided with the first shaft member through hole, a pair of side plate portions that bend and extend from both the left and right sides of the back plate portion, each having an end timber contact portion on both sides of the first shaft member through hole, and a plate provided so as to span between the end timber contact portions on both sides of each of the pair of side plate portions, and having the second shaft member through hole. Furthermore, the formwork fastening fitting according to the present invention is also characterized in that the end timber retaining fitting comprises a back plate portion having a first shaft member through hole and end timber contact portions provided on each side of the first shaft member through hole; side plate portions that bend and extend from both sides or one side in the longitudinal direction of the back plate portion to prevent the end timber from falling off; and a U-shaped member having a pair of upright plate portions provided on the side of the back plate portion opposite to the fastening nut so as to sandwich the first shaft member through hole, and an upper plate portion provided between the pair of upright plate portions spaced apart from the back plate portion and having a second shaft member through hole. [Effects of the Invention]

[0008] In the formwork fastening fitting according to the present invention, the end timber is fixed to the formwork board by passing the shaft member through multiple shaft member through holes provided at intervals in the end timber retaining fitting and fastening it with a fastening nut. Compared to conventional formwork fastening fittings in which the shaft member is passed through one shaft member through hole in the end timber retaining fitting, it is possible to suppress the tilting and rotation of the end timber retaining fitting relative to the shaft member, thereby reducing the time and labor required for formwork construction work. [Brief explanation of the drawing]

[0009] [Figure 1] This figure shows an example of a formwork configuration using the formwork fastening fittings of Embodiment 1 according to the present invention. [Figure 2] This is a front view of the formwork fastening fitting according to Embodiment 1 of the present invention. [Figure 3] (a) to (c) are a plan view, left side view, and right side view of the formwork fastening fitting according to Embodiment 1 of the present invention, respectively. [Figure 4](a) and (b) are cross-sectional views along line AA in Figure 2 and along line BB in Figure 3(b), respectively. [Figure 5] (a) and (b) are front and right side views, respectively, of the end beam retaining bracket that constitutes the formwork fastening bracket of Embodiment 1 according to the present invention. [Figure 6] (a) and (b) are left side views and cross-sectional views along the CC line in Figure 6(a), respectively, of the end beam retaining fittings that constitute the formwork fastening fittings of Embodiment 1 according to the present invention. [Figure 7] (a) to (c) are a front view, a right side view, and a cross-sectional view along the DD line in Figure 7(a), respectively, of a plate to be added to the end-thickness retaining bracket of the formwork fastening fitting according to Embodiment 1 of the present invention. [Figure 8] (a) and (b) are partial cross-sectional views showing the state when a horizontal end beam is inserted on the upper side of a shaft member using the formwork fastening fitting of Embodiment 1 of the present invention, and a partial cross-sectional view showing the state when a horizontal end beam is inserted on the upper side of a shaft member using a conventional formwork fastening fitting, respectively. [Figure 9] (a) and (b) are partial cross-sectional views showing the state when a horizontal end beam is inserted to the lower side of the shaft member using the formwork fastening fitting of Embodiment 1 of the present invention, and a partial cross-sectional view showing the completed state after the horizontal end beams have been inserted to the top and bottom of the shaft member and then fastened with fastening nuts. [Figure 10] (a) to (c) are left side view, cross-sectional view along line EE in Figure 10(a), and right side view, respectively, showing modified examples of the end-thickness retaining bracket of the formwork fastening bracket according to Embodiment 1 of the present invention. [Figure 11] (a) to (c) are front view, left side view, and right side view of the formwork fastening fitting according to Embodiment 2 of the present invention, respectively. [Figure 12] (a) to (c) are, respectively, a left side view, a cross-sectional view along the FF line in Figure 12(a), and a right side view of the end beam retaining fitting that constitutes the formwork fastening fitting of Embodiment 2 according to the present invention. [Figure 13] (a) to (c) are a front view, a right side view, and a cross-sectional view along the GG line in Figure 13(a), respectively, of the U-shaped member constituting the formwork fastening fitting of Embodiment 2 according to the present invention. [Figure 14]It is a partial cross-sectional view showing the usage state of the formwork fastening fitting of Embodiment 2 according to the present invention. [Figure 15] (a) to (c) are respectively a plan view, a front view, and a left side view of the end joist pressing fitting constituting the formwork fastening fitting of Embodiment 3 according to the present invention. [Figure 16] (a) to (c) are respectively a right side view of the end joist pressing fitting constituting the formwork fastening fitting of Embodiment 3 according to the present invention, a cross-sectional view taken along line H-H in Fig. 15(a), and a cross-sectional view taken along line I-I in Fig. 15(b). [Figure 17] (a) to (c) are respectively a plan view, a front view, and a left side view of the end joist pressing fitting constituting the formwork fastening fitting of Embodiment 4 according to the present invention. [Figure 18] (a) to (d) are respectively a right side view of the end joist pressing fitting constituting the formwork fastening fitting of Embodiment 4 according to the present invention, a cross-sectional view taken along line J-J in Fig. 17(a), a cross-sectional view taken along line K-K in Fig. 17(b), and a view showing a modification example of the second shaft member through hole of the end joist pressing fitting of Embodiment 4.

Embodiments for Carrying Out the Invention

[0010] Hereinafter, the formwork fastening fittings 1 and 1" of Embodiments 1 and 2 according to the present invention will be described. Note that the formwork fastening fittings 1 and 1" of Embodiments 1 and 2 described below are merely examples of the present invention, and the present invention is not limited to the formwork fastening fittings 1 and 1" of Embodiments 1 and 2 below, and can be appropriately changed within the scope of the creation of the technical idea of the present invention.

[0011] Note that before describing the formwork fastening fittings 1 and 1" of Embodiments 1 and 2, a brief description will be given from an example of the structure of the formwork 2 using the formwork fastening fittings 1 and 1" of Embodiments 1 and 2. <​​​​The formwork 2 for pouring concrete is constructed, for example, as shown in Figure 1, by connecting cones 2c, 2c to both sides of separators 2b provided to hold the formwork plates 2a, 2a at predetermined intervals, and connecting pivot members 2d, 2d (see Figure 8(a)) that penetrate the formwork plates 2a, 2a to the cones 2c, 2c respectively, and connecting formwork fastening fittings 1, 1” of Embodiments 1 and 2 to the pivot members 2d, 2d respectively, and fixing the formwork plates 2a, 2a to the vertical end battens (crossbars) 2e and horizontal end battens 2f with the formwork fastening fittings 1, 1”. Note that only the formwork fastening fitting 1 of Embodiment 1 is shown in Figure 1.

[0013] Depending on the region, the horizontal end bolster 2f may be a steel pipe with a circular cross-section or a square-shaped pipe. In the formwork fastening fitting 1 of Embodiment 1, a horizontal end bolster 2f with a circular cross-section is used, while in the formwork fastening fitting 1'' of Embodiment 2, a horizontal end bolster 2f'' with a square cross-section (see Figure 14) is used.

[0014] Embodiment 1. <Configuration of the formwork fastening fitting 1 in Embodiment 1> The formwork fastening fitting 1 of Embodiment 1 of the present invention is a formwork fastening fitting for fixing vertical end timbers (battens) 2e and horizontal end timbers 2f, which are end timbers that support the formwork boards 2a, 2a, to the boards, and comprises a shaft member 11, an end timber retaining fitting 12, a fastening nut 13, etc.

[0015] (shaft member 11) As shown in Figure 2, the shaft member 11 is a well-known component in which a female threaded cylinder portion 11a is provided at its tip, which has a female threaded portion 11a1 that screws onto the male threaded portion of the shaft foot member 2d (see Figure 8(a)), while the rear end opposite to the female threaded cylinder portion 11a is provided with a stopper portion 11b that is flattened to prevent the end-thickness retaining bracket 12 and the fastening nut 13 from coming off, and a male threaded portion 11c is provided on the outer circumferential surface from approximately the center in the longitudinal direction of the shaft member 11 to the stopper portion 11b.

[0016] Here, the maximum outer diameter of the stopper portion 11b of the shaft member 11 is R1 (see Figure 4(a)).

[0017] (End-thickness retaining bracket 12) As shown in Figures 5 to 7, the end-thick member retaining bracket 12 has a back plate portion 12a, a pair of side plate portions 12b, 12b that are bent at 90 degrees from both the left and right sides of the back plate portion 12a and extend opposite each other, and a plate 12c that is welded or otherwise provided between the ends of the pair of side plate portions 12b, 12b.

[0018] A first shaft member through-hole 12a1 is provided at the longitudinal center of the back plate portion 12a through which the shaft member 11 passes. The width of the back plate portion 12a in the short direction near the first shaft member through-hole 12a1 is formed to be larger than the width of both the upper and lower ends of the back plate portion 12a, as shown in Figures 5(b) and 6(a). The inner diameter of the first shaft member through-hole 12a1 is R2 (see Figure 6(b)).

[0019] The tip surfaces of the pair of side plate sections 12b, 12b are provided with a pair of end member contact sections 12b1, 12b1 that are curved according to the outer shape of the horizontal end member 2f, 2f, that is, curved with an inner diameter approximately the same as the radius of the horizontal end member 2f, so as to be able to securely hold the horizontal end member 2f, 2f which is made of a circular steel pipe or the like. In addition, plates 12c are provided on the tip surfaces of the pair of side plate sections 12b, 12b between the pair of end member contact sections 12b1, 12b1 by spot welding or the like. Note that 12d indicates the welded part.

[0020] As shown in Figure 7, plate 12c is a steel plate provided between the end-thickness member contact portions 12b1, 12b1 of each of the pair of side plate portions 12b, 12b, with a gap between it and the back plate portion 12a. It has a second shaft member through-hole 12c1 through which the shaft member 11, into which the fastening nut 13 is screwed, passes continuously with the first shaft member through-hole 12a1. The second shaft member through-hole 12c1 is provided such that the straight line connecting the center of the second shaft member through-hole 12c1 and the center of the first shaft member through-hole 12a1 is perpendicular to the horizontal plane of the back plate portion 12a of the end-thickness member retaining bracket 12.

[0021] Here, if the inner diameter of the second shaft member through-hole 12c1 is R3, then between the maximum outer diameter R1 of the stopper portion 11b of the shaft member 11 (see Fig. 4(a)) and the inner diameter R2 of the first shaft member through-hole 12a1 (see Fig. 6(b)), the relationship R1 < R3 < R2 holds. Incidentally, the closer the inner diameter R3 of the second shaft member through-hole 12c1 is to the maximum outer diameter R1 of the stopper portion 11b of the shaft member 11 (see Fig. 4(a)), the more difficult it is for the end bar pressing fitting 12 to tilt with respect to the shaft member 11.

[0022] (Tightening nut 13) As shown in Fig. 3 and the like, the tightening nut 13 is screwed onto the male screw portion 11c of the shaft member 11, and is a tightening nut that presses the lateral end bars 2f, 2f toward the dam plate 2a on both sides of the end bar pressing fitting 12. Incidentally, in the present embodiment, a seated nut is used as the tightening nut 13, but of course, a normal nut may also be used. Also, a spring washer or the like can be inserted between the tightening nut 13 and the end bar pressing fitting 12 as in the invention of Patent Document 1.

[0023] <Procedure for using the formwork tightening fitting 1 of Embodiment 1> Next, the procedure for using the formwork tightening fitting 1 of Embodiment 1 configured as described above will be described with reference to the drawings.

[0024] First, as shown in Fig. 8(a), connect to the separator 2b via the cone 2c, and screw the female screw portion 11a1 of the female screw cylinder portion 11a of the shaft member 11 constituting the formwork tightening fitting 1 of Embodiment 1 onto the screw portion of the shaft foot 2d protruding from the dam plate 2a to attach this formwork tightening fitting 1.

[0025] Next, place the first lateral end bar 2f between the vertical end bar (purlin) 2e and the end bar contact portion 12b1 above the shaft member 11 of the formwork tightening fitting 1 of Embodiment 1.

[0026] In this case, if the gap between the vertical end timber (batten) 2e and the end timber retaining bracket 12 is narrow and the horizontal end timber 2f does not fit between the vertical end timber (batten) 2e and the end timber retaining bracket 12, the end timber retaining bracket 12 is moved to the stopper portion 11b at the rear end of the shaft member 11 while loosening the fastening nut 13 as necessary, and the first horizontal end timber 2f is fitted between the vertical end timber (batten) 2e and the end timber contact portion 12b1 on the upper side of the end timber retaining bracket 12.

[0027] In the conventional end-joint member retaining bracket 12' described in Patent Document 1 above, as shown in Figure 8(b), the shaft member through hole 12a1' is provided only in the back plate portion 12a' of the end-joint member retaining bracket 12'. As a result, the end-joint member retaining bracket 12' is prone to tilting and rotation relative to the shaft member 11, and the tilt is large as shown in Figure 8(b). Therefore, conventionally, it was necessary to correct the tilt and rotation of the end-joint member retaining bracket 12' for each of the numerous formwork fastening brackets, which added extra work to the formwork construction.

[0028] In contrast, in the formwork fastening fitting 1 of this embodiment 1, as shown in Figure 8(a), the shaft member 11 is passed through a first shaft member through hole 12a1 provided in the back plate portion 12a of the end timber fastening fitting 12, and a second shaft member through hole 12c1 provided in the plate 12c which is provided opposite to the back plate portion 12a at a distance from it. Therefore, the end timber fastening fitting 12 is less likely to tilt relative to the shaft member 11 than the conventional end timber fastening fitting shown in Figure 8(b), in which the shaft member 11 is passed only through the shaft member through hole 12a1' provided in the back plate portion 12a'.

[0029] Then, as shown in Figure 9(a), a second horizontal end beam 2f is inserted below the shaft member 11 of the end beam retaining bracket 1, and finally, as shown in Figure 9(b), the fastening nut 13 is rotated to fasten the end beam retaining bracket 12, thereby supporting the weir board 2a via the horizontal end beam 2f and the vertical end beam (batten) 2e.

[0030] <Summary of the formwork fastening fitting 1 of Embodiment 1 according to the present invention> As described above, in the formwork fastening fitting 1 of Embodiment 1 of the present invention, the shaft member 11 is passed through two locations: a first shaft member through hole 12a1 provided in the back plate portion 12a of the end timber fastening fitting 12, and a second shaft member through hole 12c1 in the plate 12c provided opposite to the back plate portion 12a at a distance from it. This makes it possible to suppress tilting and rotation of the end timber fastening fitting 12, thereby reducing the time and labor required for formwork construction.

[0031] Furthermore, in typical formwork fastening hardware, the end beam retaining bracket only has one shaft member through hole. Therefore, a shaft member with an outer diameter approximately the same as the inner diameter of the shaft member through hole is used. This is because if the outer diameter of the shaft member is smaller than the inner diameter of the shaft member through hole, the end beam retaining bracket is more likely to rotate or tilt. By using a shaft member with an outer diameter approximately the same as the inner diameter of the shaft member through hole, rotation and tilting of the end beam retaining bracket are suppressed. In contrast, the formwork fastening fitting 1 of Embodiment 1 of the present invention has multiple shaft member through holes, namely the first shaft member through hole 12a1 and the second shaft member through hole 12c1, spaced apart in the end member retaining fitting 12. Therefore, even if a shaft member 11 with an outer diameter smaller than the inner diameters of both the first shaft member through hole 12a1 and the second shaft member through hole 12c1 is used, it is possible to suppress the rotation and tilting of the end member retaining fitting 12 more effectively than a typical formwork fastening fitting with only one shaft member through hole, and it can accommodate shaft members of multiple outer diameters (thicknesses). For example, reducing the outer diameter of the shaft member 11 leads to weight reduction, which in turn reduces transportation costs and storage space.

[0032] Furthermore, since the plate 12c, which has a second shaft member through hole 12c1, is welded between the end member contact portions 12b1, 12b1 of the pair of side plate portions 12b, 12b of the end member retaining bracket 12, the addition of the plate 12c improves the strength of the end member retaining bracket 12 itself, thereby improving the overall strength of the formwork.

[0033] In addition, in the formwork fastening fitting 1 of Embodiment 1 according to the present invention, since the inner diameter R3 of the second shaft member through-hole 12c1 provided in the plate 12c is smaller than the inner diameter R2 of the first shaft member through-hole 12a1 provided in the back plate portion 12a of the end beam pressing fitting 12, it is possible to suppress the inclination and rotation of the end beam pressing fitting 12 more effectively than when the inner diameters R3 and R2 are the same, and the labor and effort required for the formwork construction work can be reduced.

[0034] In the description of the above Embodiment 1, it was explained that the relationship R3 < R2 holds, where the inner diameter R3 of the second shaft member through-hole 12c1 provided in the plate 12c is smaller than the inner diameter R2 of the first shaft member through-hole 12a1 provided in the back plate portion 12a of the end beam pressing fitting 12. However, the present invention is not limited to this, and R3 ≥ R2 may be used. However, if R3 ≥ R2, the end beam pressing fitting 12 is likely to tilt with respect to the shaft member 11. Therefore, it is preferably configured such that the relationship R3 < R2 holds as much as possible.

[0035] However, even when the inner diameter R3 of the second shaft member through-hole 12c1 provided in the plate 12c is equal to the inner diameter R2 of the first shaft member through-hole 12a1 provided in the back plate portion 12a of the end beam pressing fitting 12, i.e., R3 = R2, for example, as shown in FIGS. 10(a) to (c), the center of the first shaft member through-hole 12a1 and the center of the second shaft member through-hole 12c1' are displaced, and the minor diameter R4 of the overlapping portion of the first shaft member through-hole 12a1 and the second shaft member through-hole 12c1 is larger than the maximum outer diameter R1 of the shaft member 11 (see FIG. 4(a)), that is, R4 > R1 holds. A plate 12c' with the center of the second shaft member through-hole 12c1' displaced is welded between the pair of side plate portions 12b, 12b of the end beam pressing fitting 12, and the shaft member 11 is configured to pass through the first shaft member through-hole 12a1 and the second shaft member through-hole 12c1' with their centers displaced.

[0036] Embodiment 2. The formwork fastening fitting 1 of the above Embodiment 1 was described as a formwork fastening fitting for the horizontal end beam 2f of a circular steel pipe. However, the formwork fastening fitting 1” of Embodiment 2 is a formwork fastening fitting for the horizontal end beam 2f” of a square angle pipe.

[0037] Figures 11(a) to 11(c) show the front view, left side view, and right side view of the formwork fastening fitting 1" of Embodiment 2 according to the present invention, respectively. Figures 12(a) to 12(c) show the left side view, cross-sectional view along the FF line, and right side view of the end beam retaining fitting 12" that constitutes the formwork fastening fitting 1" of Embodiment 2, respectively. Figures 13(a) to 13(c) show the front view, right side view, and cross-sectional view along the GG line in Figure 13(a) of the U-shaped fitting 12e that constitutes the formwork fastening fitting 2 according to Embodiment 2, respectively. Figure 14 is a partial cross-sectional view showing the formwork fastening fitting 1" of Embodiment 2 according to the present invention in use.

[0038] As shown in Figure 14, in the formwork fastening fitting 1" of Embodiment 2, the horizontal end bolster 2f" of the square pipe is pressed against the weir board 2a. Therefore, the only difference from the formwork fastening fitting 1 of Embodiment 1 is the configuration of the end bolster retaining fitting 12"; the configuration of the shaft member 11 and the fastening nut 13 is unchanged from that of the formwork fastening fitting 1 of Embodiment 1. For this reason, the explanation will focus on the configuration of the end bolster retaining fitting 12".

[0039] (12") End-thickness retaining bracket As shown in Figures 11 and 12, the end-thick member retaining bracket 12" consists of a back plate portion 12a", a pair of side plate portions 12b", 12b", which are bent at 90 degrees from both ends in the longitudinal direction of the back plate portion 12a", i.e., the vertical direction in the figure, and face each other, and a U-shaped member such as a U-shaped fitting 12e which is attached to the back plate portion 12a" by welding or the like.

[0040] As shown in Figure 14, which will be described later, the back plate portion 12a" has a flat portion 12a1" that the surface of the back plate portion 12a" itself abuts against and presses against the sides of two horizontal end battens 2f" that are arranged vertically (up and down), and a reinforcing curved projection portion 12a2" that is surrounded by the flat portion 12a1" and curves outwards in the opposite direction to the direction in which the pair of side plate portions 12b", 12b" extend when viewed from the front. In the center of the reinforcing curved projection portion 12a2", a first shaft member through hole 12a21" (see Figure 12(b)) with an inner diameter R2 for passing the shaft member 11 is provided, similar to Embodiment 1.

[0041] The pair of side plate parts 12b” and 12b” are provided so as to face each other by being bent at 90 degrees from both ends in the vertical direction which is the longitudinal direction of the back plate part 12a”. They are side plate parts that prevent the horizontal end thick members 2f” from falling off by abutting or approaching the upper and lower surfaces of the two horizontal end thick members 2f” arranged in the vertical direction (up and down direction). Incidentally, the configurations of the back plate part 12a” and the side plate parts 12b” and 12b” of the end thick member pressing metal fitting 12” are well-known configurations.

[0042] As shown in FIGS. 13(a) to (c), the U-shaped metal fitting 12e is a U-shaped member provided by spot welding or the like to the surface of the reinforcing curved protrusion 12a2” of the back plate part 12a” of the end thick member pressing metal fitting 12” on the side opposite to the fastening nut 13, that is, on the side of the pair of side plate parts 12b” and 12b”. Incidentally, the reference numeral 12d” is the welded part.

[0043] As shown in FIGS. 13(a) to (c), the U-shaped metal fitting 12e is formed in a U shape by a pair of standing plate parts 12e1 and 12e1 that stand up so as to sandwich the first shaft member through hole 12a21” and extend to the height of the flat part 12a1” of the back plate part 12a”, and an upper plate part 12e2 provided so as to be substantially flush with the flat part 12a1” of the back plate part 12a” between the pair of standing plate parts **********. The upper plate part 12e2 is provided with a second shaft member through hole 12e21 having an inner diameter R3 similar to the second shaft member through hole 12c1 of the first embodiment.

[0044] Here, the relationship between the inner diameter R3 of the second shaft member through hole 12e21 provided in the U-shaped metal fitting 12e and the inner diameter R2 of the first shaft member through hole 12a1” is set to R3 < R2, similar to the formwork fastening metal fitting 1 of the first embodiment.

[0045] It should be noted that there seems to be an incomplete part in the description of the "**********" part in the translation of item . You can check and correct it according to the original text.Therefore, in the formwork fastening fitting 1” of Embodiment 2, the shape of the end joist pressing fitting 12” is only different from that of the end joist pressing fitting 12 of the formwork fastening fitting 1 of Embodiment 1. Similar to the end joist pressing fitting 12 of the formwork fastening fitting 1 of Embodiment 1, the first shaft member through holes 12a21” and the second shaft member through holes 12e21 are provided at intervals in the pressing direction. In order to pass the shaft member 11 through these two shaft member through holes 12a21”, 12e21, it is possible to suppress the inclination and rotation of the end joist pressing fitting 12” with respect to the shaft member 11, similar to the formwork fastening fitting 1 of Embodiment 1. Thus, the labor and effort required for the formwork construction work can be reduced, and it is possible to accommodate shaft members 11 with a plurality of outer diameters (thicknesses).

[0046] Also, in the formwork fastening fitting 1” of Embodiment 2 as well, similar to the formwork fastening fitting 1 of Embodiment 1, the inner diameter R3 of the second shaft member through hole 12e21 provided in the U-shaped fitting 12e (see Fig. 13(c)) is smaller than the inner diameter R2 of the first shaft member through hole 12a1” (see Fig. 12(b)), and the relationship R3 < R2 holds. However, in the present invention, it is not limited to this, and of course, R3 ≥ R2 is also acceptable.

[0047] Also, similar to the modification example of the formwork fastening fitting 1 of Embodiment 1 shown in Fig. 10, the inner diameter R3 of the second shaft member through hole 12e21 provided in the U-shaped fitting 12e is made equal to the inner diameter R2 of the first shaft member through hole 12a1” provided in the back plate portion 12a” of the end joist pressing fitting 12”, i.e., R3 = R2. The center of the first shaft member through hole 12a1” and the center of the second shaft member through hole 12e21 are offset, and the U-shaped fitting 12e is provided with its center offset on the back plate portion 12a” of the end joist pressing fitting 12” so that the shaft member 11 passes through the overlapping portion of the first shaft member through hole 12a1” and the second shaft member through hole 12e21. Of course, this is also acceptable.

[0048] In the description of the formwork fastening fitting 1” of Embodiment 2 above, a pair of side plate portions 12b”, 12b” are provided on the back plate portion 12a” of the end joist pressing fitting 12” for the description. However, in the present invention, it is not limited to this, and of course, a configuration in which the side plate portion 12b” is provided only on one side in the longitudinal direction of the back plate portion 12a” is also acceptable.

[0049] Embodiment 3. In the formwork fastening fittings 1,1” of the above embodiments 1 and 2, in order to provide the second shaft member through holes 12c1, 12c1', and 12e21 in the end beam member retaining fittings 12, 12” plates 12c, 12c' with the second shaft member through holes 12c1, 12c1' and U-shaped members 12e with the second shaft member through hole 12e21 are welded to the end beam member retaining fittings 12, 12”. However, the formwork fastening fitting of embodiment 3 is characterized in that the second shaft member through holes are directly provided in the end beam member retaining fitting 32 without welding. Note that only the configuration of the end beam member retaining fitting 32 differs from the formwork fastening fittings 1, 1” of embodiments 1 and 2, and the configuration of the shaft member 11 and fastening nut 13 is unchanged from that of the formwork fastening fittings 1, 1” of embodiments 1 and 2, so only the configuration of the end beam member retaining fitting 32 of embodiment 3 will be illustrated and explained.

[0050] Figures 15(a) to 15(c) are a plan view, front view, and left side view of the end beam retaining bracket 32 ​​of the formwork fastening bracket of Embodiment 3. Figures 16(a) to 16(c) are a right side view, a cross-sectional view along line HH, and a cross-sectional view along line II.

[0051] As shown in Figures 15(a) to (c) and 16(a) to (c), the formwork fastening bracket 32 ​​of Embodiment 3 has a back plate portion 32a and a pair of side plate portions 32b, 32b that are bent 90 degrees from both the left and right sides of the back plate portion 32a and extend opposite each other. A first shaft member through hole 32a1 through which the shaft member 11 passes is provided at the longitudinal center of the back plate portion 32a. The width of the back plate portion 32a in the short direction near the first shaft member through hole 32a1 is formed to be larger than the width of both the upper and lower ends of the back plate portion 32a. On the upper and lower end surfaces of the pair of side plate portions 32b, 32b, there are shaft member contact portions 32b1, 32b1 that press down on the horizontal shaft members 2f, 2f which are circular steel pipes. Up to this point, it is the same as the shaft member fastening bracket 12 of Embodiment 1.

[0052] In the end joist pressing metal fitting 32 of the formwork fastening metal fitting of Embodiment 3, a pair of side plate intermediate bent pieces 32b21, 32b21 that are bent 90 degrees inward from the tips of the side plate intermediate portions 32b2, 32b2 and are substantially flush are provided at the side plate intermediate portions 32b2, 32b2 between the end joist contact portions 32b1, 32b1 of the pair of side plates 32b, 32b, respectively. In addition, second shaft member through portions 32b21a, 32b21a that are curved in a substantially semicircular shape are provided on the opposing tip surfaces of the pair of side plate intermediate bent pieces 32b21, 32b21, respectively, and a second shaft member through hole 32b3 is formed by opposing the second shaft member through portions 32b21a, 32b21a. In FIGS. 15 and 16, the tip surfaces of the pair of side plate intermediate bent pieces 32b21, 32b21 are not in close contact with each other, and a small gap (slit) is present above and below the second shaft member through hole 32b3, but it is of course possible to form the tip surfaces of the pair of side plate intermediate bent pieces 32b21, 32b21 in close contact with each other so that there is no gap above and below.

[0053] Here, also in the formwork fastening metal fitting of Embodiment 3, as shown in FIG. 16(b), the relationship between the inner diameter R3 of the second shaft member through hole 32b3 formed by the second shaft member through portions 32b21a, 32b21a of the pair of side plate intermediate bent pieces 32b21, 32b21 and the inner diameter R2 of the first shaft member through hole 32a1 is set to R3 < R2, similar to the formwork fastening metal fitting 1 etc. of the above Embodiment 1.

[0054] Therefore, according to the formwork fastening metal fitting of Embodiment 3, similar to the formwork fastening metal fittings 1, 1” of Embodiments 1 and 2, the first shaft member through hole 32a1 and the second shaft member through hole 32b3 are provided at intervals in the end joist pressing metal fitting 32, and the shaft member 11 is passed through the two shaft member through holes 32a1, 32b3. Therefore, similar to the formwork fastening metal fittings 1, 1” of Embodiments 1 and 2, it is possible to suppress the inclination and rotation of the end joist pressing metal fitting 32 with respect to the shaft member 11, reduce the labor and effort required for formwork construction work, and enable correspondence to shaft members 11 having a plurality of outer diameters (thicknesses).

[0055] In particular, in the formwork fastening fitting of Embodiment 3, since the second shaft member passing portions 32b21a, 32b21a of the side plate intermediate bending pieces 32b21, 32b21 integrated with the pair of side plate portions 32b, 32b of the end joist pressing fitting 32 are abutted to form the second shaft member passing hole 32b3, unlike the formwork fastening fittings 1, 1" of Embodiments 1 and 2, the welding operations of the plates 12c, 12c' and the U-shaped fitting 12e can be omitted.

[0056] In addition, also in the formwork fastening fitting of Embodiment 3, similar to the formwork fastening fittings 1, 1" of the above Embodiments 1 and 2, although it has been described that the relationship of R3 < R2 is established, where the inner diameter R3 of the second shaft member passing hole 32b3 formed by the second shaft member passing portions 32b21a, 32b21a of the pair of side plate intermediate bending pieces 32b21, 32b21 is smaller than the inner diameter R2 of the first shaft member passing hole 32a1, in the present invention, it is not limited to this, and of course, R3 ≥ R2 may be used.

[0057] Also, in the formwork fastening fitting of Embodiment 3, similar to the modified example of the formwork fastening fitting 1 of Embodiment 1 shown in FIG. 10, the inner diameter R3 of the second shaft member passing hole 32b3 formed by the second shaft member passing portions 32b21a, 32b21a of the pair of side plate intermediate bending pieces 32b21, 32b21 is made equal to the inner diameter R2 of the first shaft member passing hole 32a1 provided in the back plate portion 32a of the end joist pressing fitting 32, i.e., R3 = R2, the center of the first shaft member passing hole 32a1 and the center of the second shaft member passing hole 32b3 are offset, and of course, the position of the second shaft member passing hole 32b3 may be offset so that the shaft member 11 passes through the overlapping portion of the first shaft member passing hole 32a1 and the second shaft member passing hole 32b3.

[0058] Embodiment 4. In the formwork fastening fitting of Embodiment 3 described above, unlike the formwork fastening fittings 1,1'' of Embodiments 1 and 2, the plates 12c, 12c' and U-shaped fittings 12e are not welded, and the intermediate bent pieces 32b21, 32b21 of the side plates, which are integrated with the pair of side plate portions 32b, 32b of the end-thick member retaining fitting 32, are bent to provide the second shaft member through hole 32b3. However, in the formwork fastening fitting of Embodiment 4, the plates 12c, 12c' and U-shaped fittings 12e are not welded, Furthermore, it is characterized by the provision of a second shaft member through hole without providing a pair of side plate intermediate bent pieces 32b21, 32b21. In addition, in the formwork fastening fitting of Embodiment 4, only the configuration of the end timber retaining fitting 42 differs from the formwork fastening fittings 1,1" of Embodiments 1 and 2, and the configuration of the shaft member 11 and fastening nut 13 is unchanged from that of the formwork fastening fittings 1,1" of Embodiments 1 and 2, so only the configuration of the end timber retaining fitting 42 of Embodiment 4 will be illustrated and explained.

[0059] Figures 17(a) to 17(c) are a plan view, front view, and left side view of the end beam retaining bracket 42 of the formwork fastening bracket of Embodiment 4. Figures 18(a) to 18(c) are its right side view, cross-sectional view along line JJ, and cross-sectional view along line KK.

[0060] As shown in Figures 17(a) to (c) and 18(a) to (c), the formwork fastening fitting end joist retaining fitting 42 of Embodiment 4 has a back plate portion 42a and a pair of side plate portions 42b, 42b that are bent 90 degrees from both the left and right sides of the back plate portion 42a and extend opposite each other. A first shaft member through hole 42a1 through which the shaft member 11 passes is provided at the longitudinal center of the back plate portion 42a, and the width of the back plate portion 42a in the short direction near the first shaft member through hole 42a1 is formed to be larger than the width of both the upper and lower ends of the back plate portion 42a, while end joist contact portions 42b1, 42b1 that hold down the horizontal end joists 2f, 2f which are circular steel pipes are provided at the upper and lower end surfaces of the pair of side plate portions 42b, 42b. Up to this point, it is the same as Embodiments 1 and 3.

[0061] In the formwork fastening fitting of Embodiment 4, the tip sides of the middle side plate portions 42b2, 42b2 between the pair of end bar abutting portions 42b1, 42b1 are obliquely narrowed so as to approach each other as they go inward as shown in FIGS. 17(a), (c) and FIG. 18(c), etc., and as shown in FIG. 17(c), etc., bend the tip portions of the middle side plate portions 42b2, 42b2 so as to be curved to form a pair of second shaft member passing portions 42b21, 42b21, and form a second shaft member passing hole 42b3 by the pair of second shaft member passing portions 42b21, 42b21. In Embodiment 4, as shown in FIGS. 17 and 18, the second shaft member passing portions 42b21, 42b21 are not in close contact with each other, and there is a gap above and below the second shaft member passing hole 42b3, but of course, the pair of side plate portions 42b, 42b may be narrowed so that the second shaft member passing portions 42b21, 42b21 are in close contact with each other, and the second shaft member passing hole 42b3 is formed so that there is no gap above and below.

[0062] Here, also in the formwork fastening fitting of Embodiment 4, as shown in FIG. 12(b), etc., the relationship between the inner diameter R3 of the second shaft member passing hole 42b3 and the inner diameter R2 of the first shaft member passing hole 42a1 by the tip portions of the narrowed middle side plate portions 42b2, 42b2 is the same as that of the formwork fastening fitting 1 of the above Embodiment 1, etc., and is in the relationship of R3 < R2.

[0063] Therefore, according to the formwork fastening fitting of Embodiment 4, like the formwork fastening fittings of Embodiments 1 to 3, the first shaft member passing hole 42a1 and the second shaft member passing hole 42b3 are provided at intervals, and the shaft member 11 is passed through the two shaft member passing holes 42a1, 42b3. Therefore, like the formwork fastening fittings of Embodiments 1 to 3, it is possible to suppress the inclination and rotation of the end bar pressing fitting 42 with respect to the shaft member 11, reduce the labor and effort required for the formwork construction work, and can correspond to shaft members 1 with a plurality of outer diameters (thicknesses).

[0064] In particular, in the formwork fastening fitting of Embodiment 4, the tip portions of the side plate intermediate portions 42b2, 42b2 of the pair of side plates 42b, 42b of the end joist pressing fitting 42 are narrowed to form a W shape with a curved center as shown in FIG. 17(c) etc., and the second shaft member through holes are formed by the tip portions of the side plate intermediate portions 42b2, 42b2. Therefore, unlike the formwork fastening fittings 1, 1” of Embodiments 1 and 2, the welding operations of the plates 12c, 12c’ and the U-shaped fitting 12e can be omitted.

[0065] Incidentally, also in the formwork fastening fitting of Embodiment 4, although it has been described that the inner diameter R3 of the second shaft member through hole 42b3 formed by the tip portions of the side plate intermediate portions 42b2, 42b2 satisfies the relationship R3 < R2, which is smaller than the inner diameter R2 of the first shaft member through hole 42a1, similar to the formwork fastening fittings of Embodiments 1 to 3 of the present invention, the present invention is not limited to this, and of course, R3 ≧ R2 may be used.

[0066] Also, in the formwork fastening fitting of Embodiment 4, similar to the modified example of the formwork fastening fitting 1 of Embodiment 1 shown in FIG. 10, the inner diameter R3 of the second shaft member through hole 42b3 formed by the narrowed tip portions of the side plate intermediate portions 42b2, 42b2 is made equal to the inner diameter R2 of the first shaft member through hole 42a1 provided in the back plate portion 42a of the end joist pressing fitting 42, i.e., R3 = R2, the center of the first shaft member through hole 42a1 and the center of the second shaft member through hole 42b3 are displaced, and of course, the position of the second shaft member through hole 42b3 may be displaced so that the shaft member 11 passes through the overlapping portion of the first shaft member through hole 42a1 and the second shaft member through hole 42b3.

[0067] Furthermore, in the formwork fastening fitting of Embodiment 4, as shown in Figure 17(c), the second shaft member through-hole 42b3 was formed by a pair of curved second shaft member through-holes 42b21, 42b21 formed at the ends of the intermediate side plate portions 42b2, 42b2 located between the pair of end-thickness member contact portions 42b1, 42b1. However, the present invention is not limited to this, and it is sufficient as long as the second shaft member through-hole is provided at a distance from the first shaft member through-hole 42a1. For example, as shown in Figure 18(d), a pair of second shaft member through-holes 42b21', 42b21' are formed by bending the ends of the intermediate side plate portions 42b2, 42b2 so that the center becomes a bent portion (corner portion), and the second shaft member through-hole 42b3' is formed by this pair of second shaft member through-holes 42b21', 42b21'.

[0068] Furthermore, in the formwork fastening fittings of Embodiments 1, 3, and 4, the shapes of the end member contact portions 12b1, 32b1, and 42b1 of the end member retaining fittings 12, 32, and 42, respectively, were described as being formed in a curved shape to match the cross-sectional shape of the horizontal end member 2f of the circular steel pipe. However, the present invention is not limited to this, and of course, the shapes of the end member contact portions 12b1, 32b1, and 42b1 may also be formed in a rectangular shape to match the cross-sectional shape of the horizontal end member 2f" of the square pipe that is held down by the formwork fastening fitting 1" of Embodiment 2. [Explanation of Symbols]

[0069] 1…Formwork fastening hardware 11...Shaft member 11a...Female threaded cylinder 11a1...Female thread section 11b... Stopper part 11c…Male thread part 12,12"... End-piece timber retaining bracket 12a,12a”…back plate part 12a1, 12a21”…Through-holes for the first shaft member 12b,12b”…Side plate part 12b1…Stick material contact part 12c, 12c'...plate 12c1…Second shaft member through hole 12d, 12d”…Welded section 12e... U-shaped metal fitting (U-shaped member) 12e1…Standing plate part 12e2…Upper plate section 12e21... Through hole for second shaft member 13… Fastening nut 2…Formwork 2a…Weir plate 2b... Separator 2c...corn 2d…Axle foot material 2e…Vertical thick timber (piece) 2f,2f”…Horizontal thick timber 32... End-piece timber retaining bracket 32a...Back plate part 32a1...Through hole for the first shaft member 32b...Side plate part 32b1…Stick material contact part 32b2...Middle part of side plate 32b21…Side plate intermediate bent piece 32b21a...Second shaft member through section 32b3... Through hole for second shaft member 42... End timber retaining bracket 42a...Back plate part 42a1...Through hole for the first shaft member 42b...Side plate part 42b1…Stick material contact part 42b2...Middle section of the side panel 42b21, 42b21'... Second shaft member through section 42b3, 42b3'... Through holes for the second shaft member

Claims

1. A formwork fastening fitting for fixing end timbers to the formwork boards that make up the formwork, The shaft member has a female threaded portion at its tip that screws into the male threaded portion of the shaft base, and a male threaded portion on its outer surface, A retaining bracket for the end member is provided with an end member contact portion that abuts against the end member, and has multiple shaft member through holes provided at intervals for the shaft member to pass through, A formwork fastening fitting characterized by having a fastening nut that screws onto the male threaded portion of the shaft member that protrudes from the opposite side of the end-thick member fastening fitting through the plurality of shaft member through holes.

2. In the formwork fastening fitting according to claim 1, The aforementioned end-thickness member retaining bracket has, as the plurality of shaft member through holes, a first shaft member through hole on the side of the fastening nut and a second shaft member through hole on the side of the female thread portion of the shaft member. A formwork fastening fitting characterized in that the diameter of the through-hole of the second shaft member is smaller than the diameter of the through-hole of the first shaft member.

3. In the formwork fastening fitting according to claim 1, The aforementioned end-thickness member retaining bracket has, as the plurality of shaft member through holes, a first shaft member through hole on the side of the fastening nut and a second shaft member through hole on the side of the female thread portion of the shaft member. The formwork fastening fitting is characterized in that the first shaft member through-hole is provided at a position shifted to one side from the midpoint of the longitudinal direction of the end timber retaining fitting, while the second shaft member through-hole is provided at a position shifted to the other side from the midpoint of the longitudinal direction of the end timber retaining fitting, and the first shaft member through-hole and the second shaft member through-hole are formed to overlap by more than the outer diameter of the shaft member in a direction perpendicular to the longitudinal direction of the end timber retaining fitting, and the shaft member is configured to pass through the overlapping portion of the first shaft member through-hole and the second shaft member through-hole.

4. In the formwork fastening fitting according to claim 2 or claim 3, The aforementioned retaining bracket for the end beam is, The back plate portion provided with the first shaft member through hole, A pair of side plates extend from both the left and right sides of the back plate portion, each having a contact portion for the end thick material on both sides of the through-hole of the first shaft member, A formwork fastening fitting characterized by comprising a plate provided so as to span between the end-thick member contact portions on both sides of each of the pair of side plate portions, and having a through hole for the second shaft member.

5. In the formwork fastening fitting according to claim 2 or claim 3, The aforementioned retaining bracket for the end beam is, A back plate portion is provided with the first shaft member through hole, and the end-thick member contact portions are provided on each side of the first shaft member through hole, Side plate portions that bend and extend from both sides or one side in the longitudinal direction of the back plate portion to prevent the end bolster from falling off, A formwork fastening fitting comprising a pair of upright plate portions provided on the side of the back plate portion opposite to the fastening nut so as to sandwich the first shaft member through hole, and a U-shaped member provided between the pair of upright plate portions spaced apart from the back plate portion, having an upper plate portion provided with the second shaft member through hole.

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