JPH0240685Y2 - - Google Patents

Description

[Detailed explanation of the invention] This invention provides
When assembling concrete formwork, the engagement relationship between the spacing rods that maintain the formwork spacing and the formwork clamping fittings should be in the best condition, and when dismantling the formwork after the poured concrete has hardened, a large amount of This invention relates to a concrete formwork tightening device characterized in that the formwork spacing rod used can be quickly removed from the formwork by a simple operation. That is, the conventionally used concrete formwork spacing rods are as shown in Figure 1 of the attached drawings.
When engaging the engagement part of the concrete formwork clamping fitting through the insertion hole drilled in the formwork, use the semicircular heads formed at both ends of the formwork spacing rod to tighten the concrete formwork. Assemble the formwork by engaging the engagement part of the metal fittings, pour concrete between the concrete forms, and tighten the formwork with the formwork spacing rod to remove the formwork from the concrete surface after the concrete hardens. After releasing the engagement with the metal fittings, it is necessary to remove the head of the formwork spacing rod inserted into the insertion hole of the formwork from the formwork. The inner horizontal part of the semicircular spherical head at the end of the formwork spacing rod gets caught in the end of the insertion hole of the formwork, making it difficult to remove the concrete formwork spacing rod from the formwork. The reality is that several formwork spacing retaining rods are inserted into the formwork, and the total amount used when building a structure is enormous, and the time and effort spent on removing it is more than expected. There was a drawback that it caused damage to the formwork during work. The present invention is a concrete formwork tightening device devised to solve the above-mentioned problems, and examples of its configuration and effects will be described below with reference to the accompanying drawings.

Figure 1 is a side view showing a conventionally commonly used formwork spacing retaining rod A'. In the figure, 1' is an engaging part that engages with a concrete formwork clamping fitting to maintain the concrete formwork spacing. Both ends of the rod A' are formed in a semicircular shape, and 2' in the figure indicates the inner horizontal part of the semispherical engaging portion 1'. Fig. 2 is a partial view showing the state in which the concrete formwork is removed from the head of the conventional concrete formwork spacing rod A', in which B is the concrete formwork, 3 is the insertion hole drilled in the formwork B, C shows the concrete that has been placed. Figure 3 is a side view showing the concrete formwork spacing rod A used in the concrete formwork tightening device of the present invention.
1 is an engaging part that engages with a concrete formwork fastening fitting which together constitutes the present invention, which will be described later. In particular, the side surface connected to the main body of the concrete form spacing rod constitutes a concave curved part 2. Further, a support washer 5, which is secured by a stopper 4, is loosely fitted to the center side of the engaging portion 1, and supports the concrete formwork B.
Furthermore, a flat portion 6 is formed at the center of the concrete form spacing rod A to prevent the concrete form spacing rod A from rotating in the hardening concrete. FIG. 4 is a partially enlarged side view of a part of the concrete form spacing retaining rod A of the present invention. Figure 5 shows a concrete formwork spacing rod A constituting the concrete formwork tightening device of the present invention and a concrete formwork tightening bracket D, which is one of the embodiments.
FIG. 6 is a partial end view taken along the - line in FIG. 5. FIG. That is, the fifth
The concrete formwork fastening fitting D constituting the present invention shown in Figs. A vertically elongated hole 8 is provided, and an inverted U-shape with a semicircular cross section is provided in the inner inner surface 9 so that the concave curved surface portion 2 of the engaging portion 1 of the concrete form spacing retaining rod A is engaged. Shape guide part 1
0 is fixed by welding. In the figure, reference numeral 16 indicates the insertion hole E is a vertical flap member, F is a horizontal flap member, and G is a wedge. FIG. 7 is a side sectional view showing a tightening device for a concrete form spacing retaining rod A and a concrete form fastening fitting D', which is one of the embodiments, constituting the concrete form tightening device of the present invention. FIG. 8 is a partial end view taken along the - line in FIG. 7. That is, the concrete formwork clamp D' used in the concrete formwork clamping device shown in FIGS. The pressing part 13 is provided with a narrow vertical hole 14 into which the concrete form spacing rod A is pushed upward from the bottom of the insertion hole 16. The concave curved surface portion 2 of the engagement portion 1 of the concrete form spacing retaining rod A on the side of the connected fastening metal body 12 has a convex curved surface portion 15 as the engaging portion that abuts and engages with the concave curved surface portion 2. be. In addition, H in the figure indicates a washer.
FIG. 9 is a side sectional view showing the tightening state of the concrete formwork spacing rod A and the concrete formwork fastening fitting D'', which is one of the embodiments, which together constitute the concrete formwork tightening device of the present invention. 10 is a partial end view taken along the - line in FIG.
The concrete formwork fastening fitting D'' shown in Figures 10 and 10 is composed of a band-shaped iron plate in a so-called U-shape with an open outer side, and a concrete formwork spacing retaining rod A is attached to the inner and outer surface 7'. A narrow vertically elongated hole 8' to be inserted is provided, and its inner surface 9' has a circular cross section so that the concave curved part 2 of the engaging part 1 of the concrete form spacing retaining rod A engages with it. In this configuration, an inverted U-shaped guide portion 10' is welded and fixed. In the figure, reference numeral 16' indicates an insertion hole. That is, as shown in Figures 3 and 4 of the attached drawings, the concrete form spacing rod A used in the structure of the concrete form tightening device of the present invention is attached to both ends of the concrete form spacing rod A. An engaging part 1 is formed in the engaging part 1, and a concave curved part 2 is formed on the side surface of the engaging part 1 that is connected to the main body of the concrete form spacing rod A, and a stopper 4 is formed in the central direction from the engaging part 1. Concrete formwork B held by
A washer 5 for supporting the is loosely fitted, and a flat portion 6 is formed to prevent the concrete form spacing rod A from rotating in the concrete when the concrete hardens. Examples of the concrete formwork clamping fittings D, D', and D'', which constitute the concrete formwork tightening apparatus of the present invention together with the concrete formwork spacing rod A, and the respective tightening apparatuses are as follows. That is, as shown in FIGS. 5 and 6 of the accompanying drawings, the engaging portion 1 of the concrete form spacing retaining rod A
is inserted into the insertion hole 3 drilled in the concrete formwork B, and the engaging part 1 of the concrete formwork spacing retaining rod A
is inserted into the narrow vertical hole 8 of the inner outer surface part 7 from the insertion hole 16 of the U-shaped concrete formwork fastening fitting D, and the concrete formwork fastening fitting D is pushed down from above. For example, the engaging part 1 of the concrete formwork spacing retaining rod A moves within an inverted U-shaped guide part 10 with a semicircular cross section that is welded and fixed to the inner inner surface part 9 of the concrete formwork fastening fitting D. , the concave curved surface portion 2 of the engaging portion 1 and the semicircular guide portion 10
When the concrete formwork spacing retaining rod A moves upward and reaches the apex horizontally, the concrete formwork B is freed from the concrete formwork spacing retaining rod A at the formwork tightening fitting D. It is firmly sandwiched between the fitted support washer 5 and the inner and outer surface parts 7 of the concrete formwork fastening fittings D, and then the vertical frame member E is pressed against the concrete formwork B to form a U-shaped shape. Insert the horizontal beam F into the concrete formwork clamp D, insert the wedge G into the wedge hole 11, and tighten the horizontal beam F.
Push forward to complete the construction of the concrete formwork tightening device. Further, an embodiment of the tightening device with the concrete formwork clamping fitting D' which constitutes the concrete formwork tightening device of the present invention together with the concrete formwork spacing rod A is as follows. That is, attached drawing No. 7
As shown in FIG. Insert from below into the narrow vertical hole 14 of the formwork pressing part 13 connected to the front end of the
When the concrete formwork clamping fitting D' is pushed down, the concave curved part 2 of the engaging part 1 of the concrete formwork spacing holding rod A and the convex curved part 15 of the formwork pressing part 13 are engaged with each other. It is firmly held. As a result, the concrete formwork B is held between the formwork pressing part 13 of the concrete formwork clamp D' and the support washer 5 of the concrete formwork spacing rod A, and the vertical frame member E and the concrete mold Frame tightening fitting body 1
The wedge G is inserted into the wedge hole 11 of No. 2, and the horizontal beam member F is pressed forward by the washer H to complete the configuration of the concrete form tightening device. In addition, an embodiment of the tightening device with the concrete formwork fastening fitting D'', which constitutes the concrete formwork tightening device of the present invention together with the concrete formwork spacing rod A, is an example of the above-mentioned concrete formwork fastening fitting D. The structure is similar to that of the concrete formwork fastener D'', and the concrete formwork fastener D'' is attached to the U-shaped inner inner surface 9' of the concrete formwork fastener D'' as shown in Figures 9 and 10 of the attached drawings. The welded and fixed inverted U-shaped guide portion 10' has a circular cross section, and the engagement with the concave curved surface portion 2 of the engaging portion 1 of the concrete form spacing retaining rod A is further It is configured to firmly engage.

As detailed above, since the concrete form spacing rod used in the structure of the concrete form tightening device of the present invention has a concave curved part at its engagement part, , when peeling the concrete formwork from the concrete surface and removing the engaging part of the concrete formwork spacing rod from the formwork, the inner surface of the insertion hole of the formwork is configured as the engaging part of the concrete formwork spacing rod. Guided by a certain concave curved surface, the engaging portion of the concrete form spacing rod is positioned at the center of the insertion hole, and the concrete form can be easily removed from the concrete form spacing rod. It becomes possible. Furthermore, the concrete formwork tightening fittings that constitute the concrete formwork tightening device of the present invention together with the concrete formwork spacing holding rods are connected to the engaging portions of the concrete formwork spacing holding rods as explained in the respective embodiments. This is because the guide part has an inverted U shape with a semicircular or circular cross section, or the guide part that engages with the engaging part of the formwork spacing rod of the formwork pressing part is configured as a convex curved part. When concrete is poured between the formworks, a pressing force is generated against the concrete formwork, and as a result, a tensile force is generated in the engagement between the engagement part of the concrete formwork spacing rod and the concrete formwork clamping fitting. However, even in such cases, due to the engagement with the concave curved part formed on the engagement part of the concrete formwork spacing rod,
Since there is no biting into the engaged state, it is possible to easily and quickly separate the concrete formwork spacing retaining rod from the concrete formwork clamping fittings, thus reducing the need for repeating the concrete formwork clamping device itself. It is a concrete formwork tightening device that is usable and economically effective and has practical effects that result in material savings.

[Brief explanation of the drawing]

Figure 1 is a side view of a conventional holding rod. FIG. 2 is a state diagram showing a state in which the formwork is removed from the head of the holding rod.
FIG. 3 is a side view of the holding rod used in the present invention. Fourth
The figure is an enlarged partial side view of a portion of the retaining rod. Fifth
The figure is a side view showing the tightened state of the holding rod and the tightening fitting of the present invention. FIG. 6 is a partial end view taken along the - line in FIG. 5. FIG. 7 is a side sectional view showing another embodiment of the present invention. FIG. 8 is a partial end view taken along the - line in FIG. 7. FIG. 9 is a side sectional view showing another embodiment of the present invention. FIG. 10 is a partial end view taken along the - line in FIG. 9. 1, 1′...Engagement part, 2...Concave curved part,
2'... Inner horizontal part, 3... Insertion hole, 4... Stopper, 5... Support washer, 6... Flat part, 7,
7'...Inner outer surface part, 8,8'...Narrow vertical elongated hole,
9, 9'... Inner inner surface part, 10, 10'... Guide part, 11, 11'... Wedge hole, 12... Tightening fitting body, 13... Formwork pressing part, 14... Narrow width vertically hole,
15... Convex curved part, 16, 16'... Insertion hole,
A, A'...Concrete form spacing rod, B...
...Concrete formwork, C...Concrete, D,
D′, D″……Concrete formwork tightening fittings, E……
Vertical frame material, F...Horizontal frame material, G...Wedge, H...
...Washer.

Claims (1)

[Claims for Utility Model Registration] (1) In tightening concrete formwork, an engaging part having a concave curved surface is formed at both ends of the formwork spacing rod, and the engaging part is engaged with the engaging part. A concrete formwork tightening device characterized by engaging and tightening a formwork tightening fitting having a curved portion formed in the internal structure. (2) When tightening concrete formwork, an engaging part having a concave curved surface is formed at both ends of the formwork spacing retaining rod, and narrow vertical holes are provided in the engaging part and the inner and outer surfaces. Concrete formwork tightening according to claim 1 of the utility model registration claim, characterized in that the U-shaped tightening fitting is engaged with and tightened with an inverted U-shaped guide portion having a semicircular cross section formed on the inner inner surface of the U-shaped tightening fitting. attached device. (3) When tightening the concrete formwork, an engaging part having a concave curved surface is formed at both ends of the formwork spacing retaining rod, and the engaging part and the front end of the formwork clamp body are connected to each other. Utility model registration claim 1, characterized in that a narrow vertical elongated hole is provided on the outside of the continuous formwork pressing part, and the engaging part having a convex curved part on the inside is engaged and tightened. Concrete form tightening equipment as described in Section 1. (4) When tightening concrete formwork, an engaging part having a concave curved surface is formed at both ends of the formwork spacing retaining rod, and narrow vertical holes are provided in the engaging part and the inner and outer surfaces. The concrete according to claim 1 of the utility model registration claim, characterized in that the concrete is engaged with and tightened by an inverted U-shaped guide portion having a circular cross section and fixed by welding to the inner inner surface of the U-shaped fastening fitting. Formwork tightening device.