JPH0344909Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial field of application> This invention can be used, for example, in the field of civil engineering and construction, to lock and fix the concrete formwork used for pouring concrete, and to move the concrete formwork at regular intervals. The present invention relates to a recess forming member that forms a recess for filling a separator end portion with a rust preventive material on a poured concrete surface corresponding to a portion of a held separator that engages with the concrete formwork.

<Prior art> In recent years, instead of the conventional rod-shaped separator with a circular cross section, separators have been used to fix and hold formwork for concrete pouring in a fixed position, and have been inserted between the abutting end surfaces of adjacent formworks. A band-shaped separator was developed that had a flat plate-shaped locking part at its end that was removable using a U-clip or the like and was locked and fixed at the same time as the formwork was connected. The following disadvantages were found in the rod-shaped separator: (a) It was necessary to form a through hole in the concrete receiving surface of the formwork to insert the end of the rod-like separator; (b) Work that requires the connection of the rod-shaped separator to the formwork and the connection of adjacent formwork to be performed separately. It has now become possible to overcome sexual disadvantages.

However, in this band-shaped separator, when the formwork is dismantled after the poured concrete has hardened, the locking portions are exposed from the concrete surface, and even if this exposed portion is cut from its base, Conventionally, the cut surface of the separator had the disadvantage of being jagged and rusting, making it impossible to achieve a beautiful finish on the concrete surface. There is a device as described in Publication No. 55-44115.

As shown in FIG. 7, the above-mentioned device allows the end of the separator 25 to be inserted through the bottom plate 22 in order to form a recess in the concrete surface 14 at a location corresponding to the end of the strip separator 6 during concrete pouring. The recess forming member 21 has a truncated conical shape and has a reinforcing piece 24 erected in a direction transverse to the longitudinal center of the elongated through hole 23 and the longitudinal direction of the through hole 23. is inserted into the end of the separator 6, concrete is poured, and after the concrete hardens, the formwork is assembled, and the concrete 14 where the above-mentioned recess forming member 21 is removed is removed.
After cutting the end of the separator 6 in the recess formed in the recess, the recess was filled with a filler such as mortar to simultaneously perform rust prevention treatment on the end of the separator 6 and finishing the concrete surface. It is something.

<Problems to be solved by the invention> In the invention, the recess forming member 21 is a truncated circle whose diameter is larger in the direction in which it hits the concrete surface so that it can be easily removed from the end of the separator 6 after concrete is poured. Since it was cone-shaped, the recess formed also had a truncated conical shape that expanded outward, and when a recess of such a shape was filled with mortar for rust prevention, the mortar would dry out due to its permeability. As the separator progresses, the volume shrinks, creating a gap between the filled mortar and the concrete surrounding the recess, causing the filled mortar to fall off and the exposed cut surface of the separator to rust. ,
There was a problem that the appearance of the concrete surface became unsightly.

Therefore, in order to eliminate the drawbacks of the conventional example, the present invention improves the structure of the recess forming member described above, so that a concentric circle is formed on the inner wall surface around the recess formed on the concrete surface and filled with rust prevention mortar. To form a corrugation in the form of a corrugation, and to prevent the solidified mortar from getting caught in the corrugation and falling off even when it contracts, thereby surely achieving stable rust prevention at the end of a separator and surface finishing of concrete.

<Means for solving the problems> The structure of the present invention to achieve the above purpose is as follows:
To explain using FIGS. 1 to 6 corresponding to the embodiment, a flat plate-shaped plate is inserted between the abutting end surfaces 9 and 9' of adjacent concrete formworks 8 and 8' and is removably locked and fixed. The separator 6 for concrete formwork, which has a locking part 7 at its end, is engaged with the locking part 7 inward in the longitudinal direction, and the end of the separator 6 is attached to the concrete surface 14 corresponding to the engagement part. Part 7
A member for forming a recess for filling with a rust preventive material corresponding to the opening on one side of the peripheral frame 1', which has a bellows-like cross-sectional shape by forming a plurality of corrugations 5 on the peripheral wall. A bottom plate 2 is connected to the end portion, and an elongated through hole 3 through which the flat plate-shaped locking portion 7 can be inserted is formed approximately at the center of the bottom plate 2. A knob piece 4 is continuously formed to protrude from the bottom plate 2 at the central position toward the opening side.

<Function> The present invention uses the above-mentioned means to insert the recess forming member 1 for filling the rust preventive material into the end portion 7 of the separator 6, and insert the opening edge of the recess forming member 1 into the concrete formworks 8, 8. The separator 6 is sandwiched between the concrete formworks 8 and 8' so as to press against the inner surface of the separator 6, and concrete is poured. After the concrete has hardened, the concrete formwork is removed, and the separator 6 end 7 is assembled. By removing the concave portion forming member 1, the end portion 7 of the separator 6 on the concrete surface is removed.
A recess 11 having corrugations 12, 12', . Even if the mortar 13 filled in the recess 11 as a rust preventive material solidifies and shrinks as it dries, it will be caught by the concave and convex portions of the concentric corrugations 12 and 12', preventing it from falling off the concrete surface. It will never become useless as a rusting material.

<Example> The following example will be explained according to the drawings.
Figure 3 shows the upper and lower adjacent concrete formworks 8 and 8'
The end flat plate-like locking part 7 of the separator 6 is inserted between the abutting end surfaces of the circumferential side plates 9 and 9' of the U clip 10.
FIG. 3 is a cross-sectional view showing a state in which it is removably locked and fixed via the .

This locking and fixing is carried out by the peripheral side plates 9,
Among the holes formed in the U-clip 9', those on the abutting end surface are brought into phase alignment, and the holes (not shown) provided in the locking part 7 are also brought into phase alignment, and in this state, the tip end 10' of the U-clip 10 is After passing through all the holes in common, the separator 6 is connected to the connected formworks 8, 8' by connecting the separating formworks 8, 8' with the clamping portions 10''. It is done.

FIG. 1 is a partially cutaway perspective view of a recess forming member 1 for filling a rust preventive material according to the present invention, which has a truncated conical shape with a larger diameter toward the outside as a whole, and has concentric corrugations 5. A bottom plate 2 is integrally connected to the small-diameter side edge of a bellows-shaped peripheral frame 1' having an uneven cross section, and a flat strip-shaped locking part 7 of a separator 6 is horizontally connected to the bottom plate 2 at approximately the center thereof. A long and narrow through hole 3 is formed that can be inserted through the through hole 3 in a separable manner.
At the top and bottom, holes are connected to the bottom plate 2 in a direction that crosses the approximate center of the through hole 3, extending to the vicinity of the peripheral frame 1' and to the vicinity of the mouth edge of the through hole 3 of the bottom plate 2, respectively. Plate-shaped knob pieces 4, 4 are formed in a continuous manner and protrude from the bottom plate 2.

The recess forming member 1 having such a structure is
The entire structure is made of synthetic resin material.

After inserting the through hole 3 into the locking portion 7 of the separator 6, the recess forming member 1 is pushed and inserted to a predetermined position inside the separator 6 in the longitudinal direction from the locking portion 7.

In this state, the recess forming member 1 is assembled to the molds 8, 8' in a slightly compressed state as described above.

Concrete is then placed on the inner surface of the forms 8, 8', and after it has hardened, the forms 8, 8' are dismantled. Next, according to FIGS. 4 to 6, the recess forming member 1 remaining on the concrete surface after the formworks 8 and 8' have been dismantled is removed using a general method with a knob 4 that is erected in the recess of the recess forming member 1. By picking it with a picking tool and deforming it using the bellows structure, it can be easily pulled out and separated from the concrete surface by forcibly peeling it off from the concrete. 6. A corrugation 1 is formed on the concrete surface around the periphery of the end, and has a smaller diameter toward the back of the concrete surface, and is concentric with the inner peripheral surface.
2, 12', . . . , a recess 11 is formed (FIG. 5).

The locking part 7 of the separator 6 exposed outward from the inner end surface on the small diameter side of this recess is appropriately cut off inside the recess 11 (Fig. 4), and then mortar or the like is applied to the recess 11. A rust preventive material 13 is filled to perform rust preventive treatment on the cut surface of the separator and flattening treatment on the concrete surface 14 (FIG. 6).

The knob 4 may be formed either above or below the through-hole 3, and may be rod-shaped instead of plate-shaped. Further, the bellows-like uneven waveform is not limited to an annular waveform, but may be a spiral waveform.

<Effect of the invention> With the above structure of the invention, corrugation-like unevenness is formed on the inner circumferential surface of the recess for filling the rust preventive material formed on the concrete surface, so that the rust preventive material filled in the recess is Since the mortar can be filled into an uneven shape that matches the shape of the recess,
Even if it dries and shrinks, it will not fall out of the recess even if it is caught in the corrugation-like unevenness and is subjected to external vibrations. Therefore, there is an advantage in that it is possible to prevent mortar from falling and forming a recess in the filled portion, or from rusting the ends of the separator in the recess, which would make the appearance of the poured concrete unsightly.

Furthermore, since the recess forming member of the present invention has a bellows-like wave structure, it can be brought into close contact with the inner surface of the concrete form even when the separator is not in a horizontal position but in an inclined position during the concrete form assembly stage. There are advantages.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway perspective view of a recess forming member for filling a rust preventive material in a separator for concrete formwork according to the present invention, Fig. 2 is a sectional view showing the state of use, and Fig. 3 is an enlarged view of the main parts. A sectional view, FIG. 4 is a sectional view showing the state after the formwork is removed after concrete placement, and FIG. 5 is an explanatory sectional view showing the attitude of removing the recess forming member.
FIG. 6 is a sectional view showing a state filled with anticorrosive mortar, and FIG. 7 is a sectional view showing a conventional recess forming member and its usage state. In the figure, 1 is a concave forming member for filling a rust preventive material in a separator for concrete formwork, 1' is a surrounding frame, 2 is a bottom plate,
3 is a through hole, 4 is a reinforcing piece, 5 is a corrugation, 6
7 is a separator, 7 is a locking part, 8 is a concrete formwork, 11 is a recessed part, and 1 is a rust-preventing mortar.

Claims (1)

[Scope of Claim for Utility Model Registration] For concrete formwork having a flat plate-shaped locking part 7 at the end that is inserted between the abutting end surfaces of adjacent concrete formworks 8, 8' and removably locked and fixed. The separator 6 is engaged with the locking portion 7 inward in the longitudinal direction, and a concave portion for filling the end portion of the separator 6 with a rust preventive material is provided on the poured concrete surface corresponding to the engagement portion. It is a member to form a plurality of corrugations 5 on the peripheral wall.
A bottom plate 2 is connected to one side opening edge of the circumferential frame 1', which has a bellows-like cross section with an uneven shape, and the flat plate-shaped lock is attached to the approximate center of the bottom plate 2. For concrete formwork, a long and narrow through hole 3 through which the portion 7 can be inserted is formed, and a knob piece 4 is formed in a continuous manner protruding from the bottom plate 2 at a position approximately in the longitudinal direction of the through hole 3 toward the opening side. Concave forming member for filling separator with rust preventive material. A recess forming member for filling a rust preventive material in a separator for concrete formwork according to claim 1, which is entirely made of a synthetic resin material. A recess forming member for filling a rust preventive material in a separator for concrete formwork according to claim 1, wherein the knob 4 is formed only on one side of the through hole 3. A recess forming member for filling a rust preventive material in a separator for concrete formwork, in which knob pieces 4 are formed on both sides of a through hole 3. A recess forming member for filling a rust preventive material in a separator for concrete formwork according to claim 1, wherein the bellows-like uneven waveform is an annular waveform. A recess forming member for filling a rust preventive material in a separator for concrete formwork according to claim 1, wherein the bellows-like uneven waveform is a spiral waveform.